Revisions for Near-Infrared Camera
| 104 | warren |
May 17, 2013 22:34
| almost 11 years ago
This page needs revision
Caption: Normal color photo (top) and normalized difference vegetation index (NDVI) image. NDVI image was derived from two color channels in a single photo taken with a camera modified with a special infrared filter. Note that tree trunks, brown grass, and rocks have very low NDVI values because they are not photosynthetic. Healthy plants typically have NDVI values between 0.1 and 0.9. Images by Chris Fastie. Fullsize Image LinkIntroductionVineyards, large farms, and NASA all use near-infrared photography for assessing plant health, usually by mounting expensive sensors on airplanes and satellites. At Public Lab, we've developed a Do-It-Yourself way to bring this technology to everyday people, enabling us to monitor our environment through quantifiable data. What is it good for?
Background: satellite infrared imagingThe study of Earth's environment from space got its start in 1972 when the first Landsat satellite was launched. The multispectral scanner it carried, like the scanners on all subsequent Landsat satellites, recorded images with both visible and near infrared light. Remote sensing scientists quickly learned that by combining visible and infrared data, they could reveal critical information about the health of vegetation. For example, the normalized difference vegetation index (NDVI) highlights the difference between the red and infrared wavelengths that are reflected from vegetation. Because red light is used by plants for photosynthesis but infrared light is not, NDVI allows scientists to estimate the amount of healthy foliage in every satellite image. Thousands of scientists, including landscape ecologists, global change biologists, and habitat specialists have relied on these valuable satellite-based NDVI images for decades.
Chris Fastie's infrared/visible camera prototype Point & shoot infrared photographyThe goal of Public Lab's Infragram project is to bring the power of NDVI and other infrared vegetation imaging back to earth where everyone can now take close-up images of plants or landscapes and instantly learn about their health and vigor. There are public sources of infrared photography for the US available through the Department of Agriculture -- NAIP and Vegscape -- but this imagery is not collected when, as often, or at useable scale for individuals who are managing small plots. We are able to tweak a single camera to capture near-infrared, green, and blue light. This allows us to photograph the secret life of plants. We do this by filtering out the red light, and reading infrared in its place using a piece of carefully chosen "superblue" filter.
The filterResearch by Chris Fastie has ... is just a piece of "superblue" filter which you can use to turn your webcam or cheap point-and-shoot into an infrared camera. How to process your images:We're working on an easy process to generate composite, infrared + visible images that will reveal new details of plant health and photosynthesis. Currently there are several approaches:
Processing overview
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| 103 | warren |
May 17, 2013 22:33
| almost 11 years ago
This page needs revision
Caption: Normal color photo (top) and normalized difference vegetation index (NDVI) image. NDVI image was derived from two color channels in a single photo taken with a camera modified with a special infrared filter. Note that tree trunks, brown grass, and rocks have very low NDVI values because they are not photosynthetic. Healthy plants typically have NDVI values between 0.1 and 0.9. Images by Chris Fastie. Fullsize Image LinkIntroductionVineyards, large farms, and NASA all use near-infrared photography for assessing plant health, usually by mounting expensive sensors on airplanes and satellites. At Public Lab, we've developed a Do-It-Yourself way to bring this technology to everyday people, enabling us to monitor our environment through quantifiable data. Background: satellite infrared imagingThe study of Earth's environment from space got its start in 1972 when the first Landsat satellite was launched. The multispectral scanner it carried, like the scanners on all subsequent Landsat satellites, recorded images with both visible and near infrared light. Remote sensing scientists quickly learned that by combining visible and infrared data, they could reveal critical information about the health of vegetation. For example, the normalized difference vegetation index (NDVI) highlights the difference between the red and infrared wavelengths that are reflected from vegetation. Because red light is used by plants for photosynthesis but infrared light is not, NDVI allows scientists to estimate the amount of healthy foliage in every satellite image. Thousands of scientists, including landscape ecologists, global change biologists, and habitat specialists have relied on these valuable satellite-based NDVI images for decades.
Chris Fastie's infrared/visible camera prototype Point & shoot infrared photographyThe goal of Public Lab's Infragram project is to bring the power of NDVI and other infrared vegetation imaging back to earth where everyone can now take close-up images of plants or landscapes and instantly learn about their health and vigor. There are public sources of infrared photography for the US available through the Department of Agriculture -- NAIP and Vegscape -- but this imagery is not collected when, as often, or at useable scale for individuals who are managing small plots. We are able to tweak a single camera to capture near-infrared, green, and blue light. This allows us to photograph the secret life of plants. We do this by filtering out the red light, and reading infrared in its place using a piece of carefully chosen "superblue" filter.
The filterResearch by Chris Fastie has ... is just a piece of "superblue" filter which you can use to turn your webcam or cheap point-and-shoot into an infrared camera. How to process your images:We're working on an easy process to generate composite, infrared + visible images that will reveal new details of plant health and photosynthesis. Currently there are several approaches:
Processing overview
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| 102 | warren |
May 17, 2013 22:27
| almost 11 years ago
This page needs revision
IntroductionVineyards, large farms, and NASA all use near-infrared photography for assessing plant health, usually by mounting expensive sensors on airplanes and satellites. At Public Lab, we've developed a Do-It-Yourself way to bring this technology to everyday people, enabling us to monitor our environment through quantifiable data. Background: satellite infrared imagingThe study of Earth's environment from space got its start in 1972 when the first Landsat satellite was launched. The multispectral scanner it carried, like the scanners on all subsequent Landsat satellites, recorded images with both visible and near infrared light. Remote sensing scientists quickly learned that by combining visible and infrared data, they could reveal critical information about the health of vegetation. For example, the normalized difference vegetation index (NDVI) highlights the difference between the red and infrared wavelengths that are reflected from vegetation. Because red light is used by plants for photosynthesis but infrared light is not, NDVI allows scientists to estimate the amount of healthy foliage in every satellite image. Thousands of scientists, including landscape ecologists, global change biologists, and habitat specialists have relied on these valuable satellite-based NDVI images for decades. Point & Shoot infrared imagingThe goal of Public Lab's Infragram project is to bring the power of NDVI and other infrared vegetation imaging back to earth where everyone can now take close-up images of plants or landscapes and instantly learn about their health and vigor. There are public sources of infrared photography for the US available through the Department of Agriculture -- NAIP and Vegscape -- but this imagery is not collected when, as often, or at useable scale for individuals who are managing small plots. We are able to tweak a single camera to capture near-infrared, green, and blue light. This allows us to photograph the secret life of plants. We do this by filtering out the red light, and reading infrared in its place using a piece of carefully chosen "superblue" filter.
The filterResearch by Chris Fastie has ... is just a piece of "superblue" filter which you can use to turn your webcam or cheap point-and-shoot into an infrared camera. How to process your images:We're working on an easy process to generate composite, infrared + visible images that will reveal new details of plant health and photosynthesis. Currently there are several approaches:
Processing overview
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| 101 | warren |
May 17, 2013 22:23
| almost 11 years ago
This page needs revision
IntroductionVineyards, large farms, and NASA all use near-infrared photography for assessing plant health, usually by mounting expensive sensors on airplanes and satellites. At Public Lab, we've developed a Do-It-Yourself way to bring this technology to everyday people, enabling us to monitor our environment through quantifiable data. Satellite infrared imagingThe study of Earth's environment from space got its start in 1972 when the first Landsat satellite was launched. The multispectral scanner it carried, like the scanners on all subsequent Landsat satellites, recorded images with both visible and near infrared light. Remote sensing scientists quickly learned that by combining visible and infrared data, they could reveal critical information about the health of vegetation. For example, the normalized difference vegetation index (NDVI) highlights the difference between the red and infrared wavelengths that are reflected from vegetation. Because red light is used by plants for photosynthesis but infrared light is not, NDVI allows scientists to estimate the amount of healthy foliage in every satellite image. Thousands of scientists, including landscape ecologists, global change biologists, and habitat specialists have relied on these valuable satellite-based NDVI images for decades. Point & Shoot infrared imagingThe goal of the Infragram project is to bring the power of NDVI and other infrared vegetation images back to earth where everyone can now take close-up images of plants or landscapes and instantly learn about their health and vigor. There are public sources of infrared photography for the US available through the Department of Agriculture -- NAIP and Vegscape -- but this imagery is not collected when, as often, or at useable scale for individuals who are managing small plots. We are able to tweak a single camera to capture near-infrared, green, and blue light. This allows us to photograph the secret life of plants. We do this by filtering out the red light, and reading infrared in its place using a piece of carefully chosen "superblue" filter.
Three modelsDIY Filter Pack: This is just a piece of "superblue" filter which you can use to turn your webcam or cheap point-and-shoot into an infrared camera. The filter allows you to take an infrared photo in the "red" channel of your camera, and a visible image in the "blue" channel. You'll also receive a white balance card and instructions on how install your filter -- it's pretty easy! Webcam: This cheap but flexible reward is perfect for plugging directly into your laptop or integrating into other projects. It's also ideal for your Raspberry Pi, if you want to take it outdoors, do timelapse photography, or write scripts to control your camera. It ships as a bare circuit board with a USB cable - like an Arduino. Point & Shoot: This is the camera we designed for ourselves, a straightforward, if basic, point-and-shoot. You can simply take photos as you normally would, then upload them to our free and open-source web app to quickly and easily get a variety of composite images and analyses. To accomplish this, we're simply modifying existing cameras which we'll buy in bulk with the best specs we can reasonably get, using the "superblue" filter. This isn't an SLR or even a particularly fully featured camera -- it likely won't have an LCD screen and may be "rebranded" with a Public Lab sticker -- but it's the new filter we've put inside which counts. The final configuration will depend on the # of backers, but it will likely use AAA batteries and use a micro SD card. We're promising a minimum of 2 megapixel resolution, but should be able to do much better, especially if we get a lot of backers. Basically, the more money we raise, the better these cameras will get! How you'll create your images:Whether you're using our DIY filter with your own camera, the Webcam, or the Point & Shoot, you'll be following the same, easy process to generate composite, infrared + visible images that will reveal new details of plant health and photosynthesis.
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| 100 | liz |
May 17, 2013 21:09
| almost 11 years ago
This page needs revision
Link to Kickstarter We are able to tweak a single camera to capture near-infrared, green, and blue light. This allows us to photograph the secret life of plants. We do this by filtering out the red light, and reading infrared in its place using a piece of carefully chosen "superblue" filter.
Three modelsDIY Filter Pack: This is just a piece of "superblue" filter which you can use to turn your webcam or cheap point-and-shoot into an infrared camera. The filter allows you to take an infrared photo in the "red" channel of your camera, and a visible image in the "blue" channel. You'll also receive a white balance card and instructions on how install your filter -- it's pretty easy! Webcam: This cheap but flexible reward is perfect for plugging directly into your laptop or integrating into other projects. It's also ideal for your Raspberry Pi, if you want to take it outdoors, do timelapse photography, or write scripts to control your camera. It ships as a bare circuit board with a USB cable - like an Arduino. Point & Shoot: This is the camera we designed for ourselves, a straightforward, if basic, point-and-shoot. You can simply take photos as you normally would, then upload them to our free and open-source web app to quickly and easily get a variety of composite images and analyses. To accomplish this, we're simply modifying existing cameras which we'll buy in bulk with the best specs we can reasonably get, using the "superblue" filter. This isn't an SLR or even a particularly fully featured camera -- it likely won't have an LCD screen and may be "rebranded" with a Public Lab sticker -- but it's the new filter we've put inside which counts. The final configuration will depend on the # of backers, but it will likely use AAA batteries and use a micro SD card. We're promising a minimum of 2 megapixel resolution, but should be able to do much better, especially if we get a lot of backers. Basically, the more money we raise, the better these cameras will get! How you'll create your images:Whether you're using our DIY filter with your own camera, the Webcam, or the Point & Shoot, you'll be following the same, easy process to generate composite, infrared + visible images that will reveal new details of plant health and photosynthesis.
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| 99 | liz |
May 17, 2013 21:06
| almost 11 years ago
This page needs revision
Link to Kickstarter We are able to craft a single camera to photograph the health of plants so that it captures near-infrared, green, and blue light. We do this by filtering out the red light, and reading infrared in its place using a piece of carefully chosen "superblue" filter.
Three modelsDIY Filter Pack: This is just a piece of "superblue" filter which you can use to turn your webcam or cheap point-and-shoot into an infrared camera. The filter allows you to take an infrared photo in the "red" channel of your camera, and a visible image in the "blue" channel. You'll also receive a white balance card and instructions on how install your filter -- it's pretty easy! Webcam: This cheap but flexible reward is perfect for plugging directly into your laptop or integrating into other projects. It's also ideal for your Raspberry Pi, if you want to take it outdoors, do timelapse photography, or write scripts to control your camera. It ships as a bare circuit board with a USB cable - like an Arduino. Point & Shoot: This is the camera we designed for ourselves, a straightforward, if basic, point-and-shoot. You can simply take photos as you normally would, then upload them to our free and open-source web app to quickly and easily get a variety of composite images and analyses. To accomplish this, we're simply modifying existing cameras which we'll buy in bulk with the best specs we can reasonably get, using the "superblue" filter. This isn't an SLR or even a particularly fully featured camera -- it likely won't have an LCD screen and may be "rebranded" with a Public Lab sticker -- but it's the new filter we've put inside which counts. The final configuration will depend on the # of backers, but it will likely use AAA batteries and use a micro SD card. We're promising a minimum of 2 megapixel resolution, but should be able to do much better, especially if we get a lot of backers. Basically, the more money we raise, the better these cameras will get! How you'll create your images:Whether you're using our DIY filter with your own camera, the Webcam, or the Point & Shoot, you'll be following the same, easy process to generate composite, infrared + visible images that will reveal new details of plant health and photosynthesis.
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| 98 | liz |
May 17, 2013 21:01
| almost 11 years ago
This page needs revision
Link to Kickstarter We are able to craft a single camera to photograph the health of plants so that it captures near-infrared, green, and blue light. We do this by filtering out the red light, and reading infrared in its place using a piece of carefully chosen "superblue" filter.
Three modelsDIY Filter Pack: This is just a piece of "superblue" filter which you can use to turn your webcam or cheap point-and-shoot into an infrared camera. The filter allows you to take an infrared photo in the "red" channel of your camera, and a visible image in the "blue" channel. You'll also receive a white balance card and instructions on how install your filter -- it's pretty easy! Webcam: This cheap but flexible reward is perfect for plugging directly into your laptop or integrating into other projects. It's also ideal for your Raspberry Pi, if you want to take it outdoors, do timelapse photography, or write scripts to control your camera. It ships as a bare circuit board with a USB cable - like an Arduino. Point & Shoot: This is the camera we designed for ourselves, a straightforward, if basic, point-and-shoot. You can simply take photos as you normally would, then upload them to our free and open-source web app to quickly and easily get a variety of composite images and analyses. To accomplish this, we're simply modifying existing cameras which we'll buy in bulk with the best specs we can reasonably get, using the "superblue" filter. This isn't an SLR or even a particularly fully featured camera -- it likely won't have an LCD screen and may be "rebranded" with a Public Lab sticker -- but it's the new filter we've put inside which counts. The final configuration will depend on the # of backers, but it will likely use AAA batteries and use a micro SD card. We're promising a minimum of 2 megapixel resolution, but should be able to do much better, especially if we get a lot of backers. Basically, the more money we raise, the better these cameras will get! How you???ll create your images:Whether you???re using our DIY filter with your own camera, the Webcam, or the Point & Shoot, you???ll be following the same, easy process to generate composite, infrared + visible images that will reveal new details of plant health and photosynthesis.
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| 97 | liz |
May 17, 2013 20:54
| almost 11 years ago
This page needs revision
Link to Kickstarter We are able to craft a single camera to photograph near-infrared, green, and blue light by filtering out the red light, and reading infrared in its place using a piece of carefully chosen "superblue" filter.
Three modelsDIY Filter Pack: This is just a piece of "superblue" filter which you can use to turn your webcam or cheap point-and-shoot into an infrared camera. The filter allows you to take an infrared photo in the "red" channel of your camera, and a visible image in the "blue" channel. You'll also receive a white balance card and instructions on how install your filter -- it's pretty easy! Webcam: This cheap but flexible reward is perfect for plugging directly into your laptop or integrating into other projects. It's also ideal for your Raspberry Pi, if you want to take it outdoors, do timelapse photography, or write scripts to control your camera. It ships as a bare circuit board with a USB cable - like an Arduino. Point & Shoot: This is the camera we designed for ourselves, a straightforward, if basic, point-and-shoot. You can simply take photos as you normally would, then upload them to our free and open-source web app to quickly and easily get a variety of composite images and analyses. To accomplish this, we're simply modifying existing cameras which we'll buy in bulk with the best specs we can reasonably get, using the "superblue" filter. This isn't an SLR or even a particularly fully featured camera -- it likely won't have an LCD screen and may be "rebranded" with a Public Lab sticker -- but it's the new filter we've put inside which counts. The final configuration will depend on the # of backers, but it will likely use AAA batteries and use a micro SD card. We're promising a minimum of 2 megapixel resolution, but should be able to do much better, especially if we get a lot of backers. Basically, the more money we raise, the better these cameras will get! |
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| 96 | liz |
May 17, 2013 20:51
| almost 11 years ago
This page needs revision
Link to Kickstarter We are able to craft a single camera to photograph near-infrared, green, and blue light by filtering out the red light, and reading infrared in its place using a piece of carefully chosen "superblue" filter. Three modelsDIY Filter Pack: This is just a piece of "superblue" filter which you can use to turn your webcam or cheap point-and-shoot into an infrared camera. The filter allows you to take an infrared photo in the "red" channel of your camera, and a visible image in the "blue" channel. You'll also receive a white balance card and instructions on how install your filter -- it's pretty easy! Infragram Webcam: This cheap but flexible reward is perfect for plugging directly into your laptop or integrating into other projects. It's also ideal for your Raspberry Pi, if you want to take it outdoors, do timelapse photography, or write scripts to control your camera. It ships as a bare circuit board with a USB cable - like an Arduino. Infragram Point & Shoot: This is the camera we designed for ourselves, a straightforward, if basic, point-and-shoot. You can simply take photos as you normally would, then upload them to our free and open-source web app to quickly and easily get a variety of composite images and analyses. To accomplish this, we're simply modifying existing cameras which we'll buy in bulk with the best specs we can reasonably get, using the "superblue" filter. This isn't an SLR or even a particularly fully featured camera -- it likely won't have an LCD screen and may be "rebranded" with a Public Lab sticker -- but it's the new filter we've put inside which counts. The final configuration will depend on the # of backers, but it will likely use AAA batteries and use a micro SD card. We're promising a minimum of 2 megapixel resolution, but should be able to do much better, especially if we get a lot of backers. Basically, the more money we raise, the better these cameras will get! |
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| 95 | liz |
May 17, 2013 19:01
| almost 11 years ago
This page needs revision
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| 94 | liz |
May 17, 2013 17:25
| almost 11 years ago
This page needs revision
2011-2012 guides for making an infrared camera:(note: this video was made when people were still putting the film negative on the outside of the camera lens. To put the film negative directly inside the camera, once you have the infrared filter removed, put your cut film negative where the filter was, replace the rubber gasket and continue with the steps in the video for reassembling.) NDVI example:
NRG example: How to take infrared and visible photographsBy putting both an infrared-pass filter and an infrared-block filter on the same camera, you can get both infrared and visible light with one photograph... though the areas don't overlap. This means you can get such imagery from the air using balloon mapping, while only risking one camera. Another alternative is to use a stereo camera system like the one being developed by the New York City chapter.
Using Photoshop to do vegetation analysis with your picturesYou can use Adobe Photoshop (or GIMP, for an open-source, free alternative) to composite an infrared and visible image to do vegetation/photosynthesis analysis. The example photos were taken from an airplane window by Stewart Long. For a more comprehensive description of this process, and alternative means to do this analysis, see the infrared vegetation analysis activity. Using MapKnitter to make infrared/visible compositesIf you captured infrared and visible pictures from a balloon or kite, you can stitch them into a map using mapknitter.org. Mapknitter supports compsiting. It looks something like this, so far:
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| 93 | liz |
May 17, 2013 17:21
| almost 11 years ago
This page needs revision
Early prototypes for making an infrared camera:(note: this video was made when people were still putting the film negative on the outside of the camera lens. To put the film negative directly inside the camera, once you have the infrared filter removed, put your cut film negative where the filter was, replace the rubber gasket and continue with the steps in the video for reassembling.) NDVI example:
NRG example: How to take infrared and visible photographsBy putting both an infrared-pass filter and an infrared-block filter on the same camera, you can get both infrared and visible light with one photograph... though the areas don't overlap. This means you can get such imagery from the air using balloon mapping, while only risking one camera. Another alternative is to use a stereo camera system like the one being developed by the New York City chapter.
Using Photoshop to do vegetation analysis with your picturesYou can use Adobe Photoshop (or GIMP, for an open-source, free alternative) to composite an infrared and visible image to do vegetation/photosynthesis analysis. The example photos were taken from an airplane window by Stewart Long. For a more comprehensive description of this process, and alternative means to do this analysis, see the infrared vegetation analysis activity. Using MapKnitter to make infrared/visible compositesIf you captured infrared and visible pictures from a balloon or kite, you can stitch them into a map using mapknitter.org. Mapknitter supports compsiting. It looks something like this, so far:
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| 92 | liz |
May 17, 2013 17:20
| almost 11 years ago
This page needs revision
Early prototypes for making an infrared camera:(note: this video was made when people were still putting the film negative on the outside of the camera lens. To put the film negative directly inside the camera, once you have the infrared filter removed, put your cut film negative where the filter was, replace the rubber gasket and continue with the steps in the video for reassembling.) NDVI example:
NRG example: How to take infrared and visible photographsBy putting both an infrared-pass filter and an infrared-block filter on the same camera, you can get both infrared and visible light with one photograph... though the areas don't overlap. This means you can get such imagery from the air using balloon mapping, while only risking one camera. Another alternative is to use a stereo camera system like the one being developed by the New York City chapter.
Using Photoshop to do vegetation analysis with your picturesYou can use Adobe Photoshop (or GIMP, for an open-source, free alternative) to composite an infrared and visible image to do vegetation/photosynthesis analysis. The example photos were taken from an airplane window by Stewart Long. For a more comprehensive description of this process, and alternative means to do this analysis, see the infrared vegetation analysis activity. Using MapKnitter to make infrared/visible compositesIf you captured infrared and visible pictures from a balloon or kite, you can stitch them into a map using mapknitter.org. Mapknitter supports compsiting. It looks something like this, so far:
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| 91 | liz |
May 17, 2013 17:15
| almost 11 years ago
This page needs revision
Infrared photography for vegetation analysisInfrared photography can help assess a plant's health. Infrared imagery for agricultural and ecological assessment is usually captured from satellites and planes, and the information is used mainly by large farms, vineyards, and academic research projects. For example, see this illustrated PDF from a commercial imagery provider who has been studying the usefulness of infrared imagery and has quotes from farmers. There are public sources of infrared photography for the US available through the Department of Agriculture -- NAIP and Vegscape -- but this imagery is not collected when, as often, or at useable scale for individuals who are managing small plots. By creating a low-cost camera and working with farmers and environmental activists, we hope to explore grassroots uses for this kind of technology. What could farmers or activists do with leaf-scale, plant-scale, lot-scale, and field-scale data on plant health if the equipment costs as little as $10 or $35?
Screenshot from 2011-09-10-colorado-boulder-foothills-community-park-NRG. See how clearly plants are identifiable from bare earth or pavement. The unique colors in this photo will be explained below, keep reading! Why does it work?Though we cannot perceive it with our eyes, everything around us (including plants) reflect wavelengths of light in red, green, blue and beyond into infrared, ultraviolet, and more. Our colorful world is created by varying amounts of particular wavelengths being absorbed and reflected. This also means that everything has a recognizable "spectral signature". Whoa.
Plants use visible light (mainly blue and red light) as 'food' -- but not so much green light, which is why they reflect green away, and thus look green to our eyes. They also happen to reflect near infrared light (which is just beyond red light, but not visible to the human eye). This is because they chemically cannot convert infrared into usable food, and so they just bounce it away to stay cool. The illustrations show what colors of light plants absorb versus reflect away.
By using this unique property of plants, plus our ability to take near-infrared photos we can create composite images which highlight where plants are and how much they are photosynthesizing. Learn about NDVI images and how they work We've been modifying cheap cameras to photograph in infrared (IR). The sensors in common digital cameras are sensitive to infrared, but come with a filter that blocks these wavelengths so that the photos look "normal" to us. Removing that filter allows us to pickup information in IR, and in that way begin to "see the invisible life of plants." Make an infrared camera:(note: this video was made when people were still putting the film negative on the outside of the camera lens. To put the film negative directly inside the camera, once you have the infrared filter removed, put your cut film negative where the filter was, replace the rubber gasket and continue with the steps in the video for reassembling.) NDVI example:
NRG example: How to take infrared and visible photographsBy putting both an infrared-pass filter and an infrared-block filter on the same camera, you can get both infrared and visible light with one photograph... though the areas don't overlap. This means you can get such imagery from the air using balloon mapping, while only risking one camera. Another alternative is to use a stereo camera system like the one being developed by the New York City chapter.
Using Photoshop to do vegetation analysis with your picturesYou can use Adobe Photoshop (or GIMP, for an open-source, free alternative) to composite an infrared and visible image to do vegetation/photosynthesis analysis. The example photos were taken from an airplane window by Stewart Long. For a more comprehensive description of this process, and alternative means to do this analysis, see the infrared vegetation analysis activity. Using MapKnitter to make infrared/visible compositesIf you captured infrared and visible pictures from a balloon or kite, you can stitch them into a map using mapknitter.org. Mapknitter supports compsiting. It looks something like this, so far:
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| 90 | liz |
May 17, 2013 17:12
| almost 11 years ago
This page needs revision
Infrared photography for vegetation analysisInfrared photography can help assess a plant's health. Infrared imagery for agricultural and ecological assessment is usually captured from satellites and planes, and the information is used mainly by large farms, vineyards, and academic research projects. For example, see this illustrated PDF from a commercial imagery provider who has been studying the usefulness of infrared imagery and has quotes from farmers. There are public sources of infrared photography for the US available through the Department of Agriculture -- NAIP and Vegscape -- but this imagery is not collected when, as often, or at useable scale for individuals who are managing small plots. By creating a low-cost camera and working with farmers and environmental activists, we hope to explore grassroots uses for this kind of technology. What could farmers or activists do with leaf-scale, plant-scale, lot-scale, and field-scale data on plant health if the equipment costs as little as $10 or $35?
Screenshot from 2011-09-10-colorado-boulder-foothills-community-park-NRG. See how clearly plants are identifiable from bare earth or pavement. The unique colors in this photo will be explained below, keep reading! Why does it work?Though we cannot perceive it with our eyes, everything around us (including plants) reflect wavelengths of light in red, green, blue and beyond into infrared, ultraviolet, and more. Our colorful world is created by varying amounts of particular wavelengths being absorbed and reflected. This also means that everything has a recognizable "spectral signature". Whoa.
Plants use visible light (mainly blue and red light) as 'food' -- but not so much green light, which is why they reflect green away, and thus look green to our eyes. They also happen to reflect near infrared light (which is just beyond red light, but not visible to the human eye). This is because they chemically cannot convert infrared into usable food, and so they just bounce it away to stay cool. The illustrations show what colors of light plants absorb versus reflect away.
By using this unique property of plants, plus our ability to take near-infrared photos we can create composite images which highlight where plants are and how much they are photosynthesizing. Learn about NDVI images and how they work We've been modifying cheap cameras to photograph in infrared (IR). The sensors in common digital cameras are sensitive to infrared, but come with a filter that blocks these wavelengths so that the photos look "normal" to us. Removing that filter allows us to pickup information in IR, and in that way begin to "see the invisible life of plants." Make an infrared camera:(note: this video was made when people were still putting the film negative on the outside of the camera lens. To put the film negative directly inside the camera, once you have the infrared filter removed, put your cut film negative where the filter was, replace the rubber gasket and continue with the steps in the video for reassembling.) NDVI example:
NRG example: How to take infrared and visible photographsBy putting both an infrared-pass filter and an infrared-block filter on the same camera, you can get both infrared and visible light with one photograph... though the areas don't overlap. This means you can get such imagery from the air using balloon mapping, while only risking one camera. Another alternative is to use a stereo camera system like the one being developed by the New York City chapter.
Using Photoshop to do vegetation analysis with your picturesYou can use Adobe Photoshop (or GIMP, for an open-source, free alternative) to composite an infrared and visible image to do vegetation/photosynthesis analysis. The example photos were taken from an airplane window by Stewart Long. For a more comprehensive description of this process, and alternative means to do this analysis, see the infrared vegetation analysis activity. Using MapKnitter to make infrared/visible compositesIf you captured infrared and visible pictures from a balloon or kite, you can stitch them into a map using mapknitter.org. Mapknitter supports compsiting. It looks something like this, so far:
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| 89 | liz |
May 17, 2013 17:09
| almost 11 years ago
This page needs revision
Infrared photography for vegetation analysisInfrared photography can help assess a plant's health. Infrared imagery for agricultural and ecological assessment is usually captured from satellites and planes, and the information is used mainly by large farms, vineyards, and academic research projects. For example, see this illustrated PDF from a commercial imagery provider who has been studying the usefulness of infrared imagery and has quotes from farmers. There are public sources of infrared photography for the US available through the Department of Agriculture -- NAIP and Vegscape -- but this imagery is not collected when, as often, or at useable scale for individuals who are managing small plots. By creating a low-cost camera and working with farmers and environmental activists, we hope to explore grassroots uses for this kind of technology. What could farmers or activists do with leaf-scale, plant-scale, lot-scale, and field-scale data on plant health if the equipment costs as little as $10 or $35?
Screenshot from 2011-09-10-colorado-boulder-foothills-community-park-NRG. See how clearly plants are identifiable from bare earth or pavement. The unique colors in this photo will be explained below, keep reading! Seeing the invisible life of plantsThough we cannot perceive it with our eyes, everything around us (including plants) reflect wavelengths of light in red, green, blue and beyond into infrared, ultraviolet, and more. Our colorful world is created by varying amounts of particular wavelengths being absorbed and reflected. This also means that everything has a recognizable "spectral signature". Whoa.
Plants use visible light (mainly blue and red light) as 'food' -- but not so much green light, which is why they reflect green away, and thus look green to our eyes. They also happen to reflect near infrared light (which is just beyond red light, but not visible to the human eye). This is because they chemically cannot convert infrared into usable food, and so they just bounce it away to stay cool. The illustrations show what colors of light plants absorb versus reflect away.
By using this unique property of plants, plus our ability to take near-infrared photos we can create composite images which highlight where plants are and how much they are photosynthesizing. Learn about NDVI images and how they work We've been modifying cheap cameras to photograph in infrared (IR). The sensors in common digital cameras are sensitive to infrared, but come with a filter that blocks these wavelengths so that the photos look "normal" to us. Removing that filter allows us to pickup information in IR, and in that way begin to "see the invisible life of plants." Make an infrared camera:(note: this video was made when people were still putting the film negative on the outside of the camera lens. To put the film negative directly inside the camera, once you have the infrared filter removed, put your cut film negative where the filter was, replace the rubber gasket and continue with the steps in the video for reassembling.) NDVI example:
NRG example: How to take infrared and visible photographsBy putting both an infrared-pass filter and an infrared-block filter on the same camera, you can get both infrared and visible light with one photograph... though the areas don't overlap. This means you can get such imagery from the air using balloon mapping, while only risking one camera. Another alternative is to use a stereo camera system like the one being developed by the New York City chapter.
Using Photoshop to do vegetation analysis with your picturesYou can use Adobe Photoshop (or GIMP, for an open-source, free alternative) to composite an infrared and visible image to do vegetation/photosynthesis analysis. The example photos were taken from an airplane window by Stewart Long. For a more comprehensive description of this process, and alternative means to do this analysis, see the infrared vegetation analysis activity. Using MapKnitter to make infrared/visible compositesIf you captured infrared and visible pictures from a balloon or kite, you can stitch them into a map using mapknitter.org. Mapknitter supports compsiting. It looks something like this, so far:
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| 88 | liz |
May 17, 2013 16:26
| almost 11 years ago
This page needs revision
Infrared cameras for vegetation analysisInfrared photography can help assess a plant's health. Infrared imagery for agricultural and ecological assessment is usually captured from satellites and planes, and the information is used mainly by large farms, vineyards, and academic research projects. For example, see this illustrated PDF from a commercial imagery provider who has been studying the usefulness of infrared imagery and has quotes from farmers. There are public sources of infrared photography for the US available through the Department of Agriculture -- NAIP and Vegscape -- but this imagery is not collected when, as often, or at useable scale for individuals who are managing small plots. By creating a low-cost camera and working with farmers and environmental activists, we hope to explore grassroots uses for this kind of technology. What could farmers or activists do with leaf-scale, plant-scale, lot-scale, and field-scale data on plant health if the equipment costs as little as $10 or $35?
Screenshot from 2011-09-10-colorado-boulder-foothills-community-park-NRG. See how clearly plants are identifiable from bare earth or pavement. The unique colors in this photo will be explained below, keep reading! Seeing the invisible life of plantsThough we cannot perceive it with our eyes, everything around us (including plants) reflect wavelengths of light in red, green, blue and beyond into infrared, ultraviolet, and more. Our colorful world is created by varying amounts of particular wavelengths being absorbed and reflected. This also means that everything has a recognizable "spectral signature". Whoa.
Plants use visible light (mainly blue and red light) as 'food' -- but not so much green light, which is why they reflect green away, and thus look green to our eyes. They also happen to reflect near infrared light (which is just beyond red light, but not visible to the human eye). This is because they chemically cannot convert infrared into usable food, and so they just bounce it away to stay cool. The illustrations show what colors of light plants absorb versus reflect away.
By using this unique property of plants, plus our ability to take near-infrared photos we can create composite images which highlight where plants are and how much they are photosynthesizing. Learn about NDVI images and how they work We've been modifying cheap cameras to photograph in infrared (IR). The sensors in common digital cameras are sensitive to infrared, but come with a filter that blocks these wavelengths so that the photos look "normal" to us. Removing that filter allows us to pickup information in IR, and in that way begin to "see the invisible life of plants." Make an infrared camera:(note: this video was made when people were still putting the film negative on the outside of the camera lens. To put the film negative directly inside the camera, once you have the infrared filter removed, put your cut film negative where the filter was, replace the rubber gasket and continue with the steps in the video for reassembling.) NDVI example:
NRG example: How to take infrared and visible photographsBy putting both an infrared-pass filter and an infrared-block filter on the same camera, you can get both infrared and visible light with one photograph... though the areas don't overlap. This means you can get such imagery from the air using balloon mapping, while only risking one camera. Another alternative is to use a stereo camera system like the one being developed by the New York City chapter.
Using Photoshop to do vegetation analysis with your picturesYou can use Adobe Photoshop (or GIMP, for an open-source, free alternative) to composite an infrared and visible image to do vegetation/photosynthesis analysis. The example photos were taken from an airplane window by Stewart Long. For a more comprehensive description of this process, and alternative means to do this analysis, see the infrared vegetation analysis activity. Using MapKnitter to make infrared/visible compositesIf you captured infrared and visible pictures from a balloon or kite, you can stitch them into a map using mapknitter.org. Mapknitter supports compsiting. It looks something like this, so far:
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| 87 | liz |
May 17, 2013 15:00
| almost 11 years ago
This page needs revision
Infrared cameras for vegetation analysisInfrared photography can help assess a plant's health. Infrared imagery for agricultural and ecological assessment is usually captured from satellites and planes, and the information is used mainly by large farms, vineyards, and academic research projects. See this PDF from a commercial imagery provider who has been studying the usefulness of infrared imagery and has illustrations and quotes from farmers. There are public sources of infrared photography for the US available through the Department of Agriculture -- NAIP and Vegscape -- but this imagery is not collected when, as often, or at useable scale for individuals who are managing small plots. By creating a low-cost camera and working with farmers and environmental activists, we hope to explore grassroots uses for this kind of technology. What could farmers or activists do with leaf-scale, plant-scale, lot-scale, and field-scale data on plant health if the equipment costs as little as $10 or $35?
Screenshot from 2011-09-10-colorado-boulder-foothills-community-park-NRG. See how clearly plants are identifiable from bare earth or pavement. The unique colors in this photo will be explained below, keep reading! Seeing the invisible life of plantsThough we cannot perceive it with our eyes, everything around us (including plants) reflect wavelengths of light in red, green, blue and beyond into infrared, ultraviolet, and more. Our colorful world is created by varying amounts of particular wavelengths being absorbed and reflected. This also means that everything has a recognizable "spectral signature". Whoa.
Plants use visible light (mainly blue and red light) as 'food' -- but not so much green light, which is why they reflect green away, and thus look green to our eyes. They also happen to reflect near infrared light (which is just beyond red light, but not visible to the human eye). This is because they chemically cannot convert infrared into usable food, and so they just bounce it away to stay cool. The illustrations show what colors of light plants absorb versus reflect away.
By using this unique property of plants, plus our ability to take near-infrared photos we can create composite images which highlight where plants are and how much they are photosynthesizing. Learn about NDVI images and how they work We've been modifying cheap cameras to photograph in infrared (IR). The sensors in common digital cameras are sensitive to infrared, but come with a filter that blocks these wavelengths so that the photos look "normal" to us. Removing that filter allows us to pickup information in IR, and in that way begin to "see the invisible life of plants." Make an infrared camera:(note: this video was made when people were still putting the film negative on the outside of the camera lens. To put the film negative directly inside the camera, once you have the infrared filter removed, put your cut film negative where the filter was, replace the rubber gasket and continue with the steps in the video for reassembling.) NDVI example:
NRG example: How to take infrared and visible photographsBy putting both an infrared-pass filter and an infrared-block filter on the same camera, you can get both infrared and visible light with one photograph... though the areas don't overlap. This means you can get such imagery from the air using balloon mapping, while only risking one camera. Another alternative is to use a stereo camera system like the one being developed by the New York City chapter.
Using Photoshop to do vegetation analysis with your picturesYou can use Adobe Photoshop (or GIMP, for an open-source, free alternative) to composite an infrared and visible image to do vegetation/photosynthesis analysis. The example photos were taken from an airplane window by Stewart Long. For a more comprehensive description of this process, and alternative means to do this analysis, see the infrared vegetation analysis activity. Using MapKnitter to make infrared/visible compositesIf you captured infrared and visible pictures from a balloon or kite, you can stitch them into a map using mapknitter.org. Mapknitter supports compsiting. It looks something like this, so far:
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| 86 | liz |
May 17, 2013 14:59
| almost 11 years ago
This page needs revision
Infrared cameras for vegetation analysisInfrared photography can help assess a plant's health. Infrared imagery for agricultural and ecological assessment is usually captured from satellites and planes, and the information is used mainly by large farms, vineyards, and academic research projects. See this PDF from a commercial imagery provider who has been studying the usefulness of infrared imagery and has illustrations and quotes from farmers. There are public sources of infrared photography for the US available through the Department of Agriculture -- NAIP and Vegscape -- but this imagery is not collected when, as often, or at useable scale for individuals who are managing small plots. By creating a low-cost camera and working with farmers and environmental activists, we hope to explore grassroots uses for this kind of technology. What could farmers or activists do with leaf-scale, plant-scale, lot-scale, and field-scale data on plant health if the equipment costs as little as $10 or $35?
Screenshot from 2011-09-10-colorado-boulder-foothills-community-park-NRG. See how clearly plants are identifiable from bare earth or pavement. The unique colors in this photo will be explained below, keep reading! Seeing the invisible life of plantsThough we cannot perceive it with our eyes, everything around us (including plants) reflect wavelengths of light in red, green, blue and beyond into infrared, ultraviolet, and more. How much of particular wavelengths being reflected create our colorful world. This also means that everything has a recognizable "spectral signature". Whoa.
Plants use visible light (mainly blue and red light) as 'food' -- but not so much green light, which is why they reflect green away, and thus look green to our eyes. They also happen to reflect near infrared light (which is just beyond red light, but not visible to the human eye). This is because they chemically cannot convert infrared into usable food, and so they just bounce it away to stay cool. The illustrations show what colors of light plants absorb versus reflect away.
By using this unique property of plants, plus our ability to take near-infrared photos we can create composite images which highlight where plants are and how much they are photosynthesizing. Learn about NDVI images and how they work We've been modifying cheap cameras to photograph in infrared (IR). The sensors in common digital cameras are sensitive to infrared, but come with a filter that blocks these wavelengths so that the photos look "normal" to us. Removing that filter allows us to pickup information in IR, and in that way begin to "see the invisible life of plants." Make an infrared camera:(note: this video was made when people were still putting the film negative on the outside of the camera lens. To put the film negative directly inside the camera, once you have the infrared filter removed, put your cut film negative where the filter was, replace the rubber gasket and continue with the steps in the video for reassembling.) NDVI example:
NRG example: How to take infrared and visible photographsBy putting both an infrared-pass filter and an infrared-block filter on the same camera, you can get both infrared and visible light with one photograph... though the areas don't overlap. This means you can get such imagery from the air using balloon mapping, while only risking one camera. Another alternative is to use a stereo camera system like the one being developed by the New York City chapter.
Using Photoshop to do vegetation analysis with your picturesYou can use Adobe Photoshop (or GIMP, for an open-source, free alternative) to composite an infrared and visible image to do vegetation/photosynthesis analysis. The example photos were taken from an airplane window by Stewart Long. For a more comprehensive description of this process, and alternative means to do this analysis, see the infrared vegetation analysis activity. Using MapKnitter to make infrared/visible compositesIf you captured infrared and visible pictures from a balloon or kite, you can stitch them into a map using mapknitter.org. Mapknitter supports compsiting. It looks something like this, so far:
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Revert | |
| 85 | liz |
May 17, 2013 14:58
| almost 11 years ago
This page needs revision
Infrared cameras for vegetation analysisInfrared photography can help assess a plant's health. Infrared imagery for agricultural and ecological assessment is usually captured from satellites and planes, and the information is used mainly by large farms, vineyards, and academic research projects. See this PDF from a commercial imagery provider who has been studying the usefulness of infrared imagery and has illustrations and quotes from farmers. There are public sources of infrared photography for the US available through the Department of Agriculture -- NAIP and Vegscape -- but this imagery is not collected when, as often, or at useable scale for individuals who are managing small plots. By creating a low-cost camera and working with farmers and environmental activists, we hope to explore grassroots uses for this kind of technology. What could farmers or activists do with leaf-scale, plant-scale, lot-scale, and field-scale data on plant health if the equipment costs as little as $10 or $35?
Screenshot from 2011-09-10-colorado-boulder-foothills-community-park-NRG. See how clearly plants are identifiable from bare earth or pavement. The unique colors in this photo will be explained below, keep reading! Seeing the invisible life of plantsThough we cannot perceive it with our eyes, everything around us (including plants) reflect wavelengths of light in red, green, blue and beyond into infrared, ultraviolet, and more. How much of particular wavelengths being reflected create our colorful world and mean that everything has a recognizable "spectral signature". Whoa.
Plants use visible light (mainly blue and red light) as 'food' -- but not so much green light, which is why they reflect green away, and thus look green to our eyes. They also happen to reflect near infrared light (which is just beyond red light, but not visible to the human eye). This is because they chemically cannot convert infrared into usable food, and so they just bounce it away to stay cool. The illustrations show what colors of light plants absorb versus reflect away.
By using this unique property of plants, plus our ability to take near-infrared photos we can create composite images which highlight where plants are and how much they are photosynthesizing. Learn about NDVI images and how they work We've been modifying cheap cameras to photograph in infrared (IR). The sensors in common digital cameras are sensitive to infrared, but come with a filter that blocks these wavelengths so that the photos look "normal" to us. Removing that filter allows us to pickup information in IR, and in that way begin to "see the invisible life of plants." Make an infrared camera:(note: this video was made when people were still putting the film negative on the outside of the camera lens. To put the film negative directly inside the camera, once you have the infrared filter removed, put your cut film negative where the filter was, replace the rubber gasket and continue with the steps in the video for reassembling.) NDVI example:
NRG example: How to take infrared and visible photographsBy putting both an infrared-pass filter and an infrared-block filter on the same camera, you can get both infrared and visible light with one photograph... though the areas don't overlap. This means you can get such imagery from the air using balloon mapping, while only risking one camera. Another alternative is to use a stereo camera system like the one being developed by the New York City chapter.
Using Photoshop to do vegetation analysis with your picturesYou can use Adobe Photoshop (or GIMP, for an open-source, free alternative) to composite an infrared and visible image to do vegetation/photosynthesis analysis. The example photos were taken from an airplane window by Stewart Long. For a more comprehensive description of this process, and alternative means to do this analysis, see the infrared vegetation analysis activity. Using MapKnitter to make infrared/visible compositesIf you captured infrared and visible pictures from a balloon or kite, you can stitch them into a map using mapknitter.org. Mapknitter supports compsiting. It looks something like this, so far:
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