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Comments

Author Comment Last activity Moderation
nedhorning "Hi - At this point the plugin does not subtract the NIR from the red. I've been doing this subtraction as part of my calibration tests: http://publ..." | Read more » about 7 years ago
nedhorning "I'm not sure what would cause that red spot. There isn't a legend or an image date so I'm assuming that the red spot is cooler than the surrounding..." | Read more » about 7 years ago
nedhorning "Hi Mercy - I think posting the user guide as a research note is a good idea. That way people can comment and also get a better idea what the Sky Ca..." | Read more » about 7 years ago
nedhorning "Hi Mercy - Thanks for the update. It's great to read about the progress. I tried to run Sky Cam on my Samsung Tab 2.0 and after the app starts I ge..." | Read more » about 7 years ago
nedhorning "I often use platforms that are moving so I use a fast shutter speed to reduce blur. I often shoot somewhere around 1/1000th of a second. You should..." | Read more » over 7 years ago
nedhorning "I usually use a gray target to white balance my NIR camera but I know some people use green vegetation like grass for the white balance. You can ex..." | Read more » over 7 years ago
nedhorning "The NIR and visible images look a little different and that could be caused by a few factors. If any of the camera settings change between images i..." | Read more » over 7 years ago
nedhorning "When I created the images above I scaled the output so and NDVI or DVI values less than 0 were set to 0. To include the full range of possible valu..." | Read more » over 7 years ago
nedhorning "Chris - I want to test to see how well calibration transfers between cameras and also between different camera settings and incident light (clear v..." | Read more » over 7 years ago
nedhorning "Hi Scott, It might be possible to calibrate a camera using a single color like a white balance card but at the very least you would need to know th..." | Read more » over 7 years ago
nedhorning "Hi Jirka, This is an interesting tool. I'm not working on any participatory mapping projects at the moment but will try to test the questionnaires..." | Read more » over 7 years ago
nedhorning "Hi Roolark - Thanks for posting your comments and sharing your research. I don't know if you can post a link to your thesis but I'd be interested ..." | Read more » over 7 years ago
nedhorning "I guess it's not actually an extra step. When I do the regression I'm comparing the JPEG pixel values that I adjusted with my inverse gamma (un)cor..." | Read more » over 7 years ago
nedhorning "Chris, What you describe is part of what I'm trying to do. I want to take your description one step further so that the “new value” represents a p..." | Read more » over 7 years ago
nedhorning "Hi jdburnett – It sounds like you have quite a nice collection of cameras. It would be great to run some calibration tests with different cameras a..." | Read more » over 7 years ago
nedhorning "Chris - Here are some comments to your first round of questions: How does this apply to dual camera systems, or does it apply only to single camer..." | Read more » over 7 years ago
nedhorning "I think it might be possible to work on a simple calibration process that could be used to get decent NDVI values. I don't think there is much a us..." | Read more » over 7 years ago
nedhorning "Nice post. It would be neat to characterize some of these cameras. I made a half-hearted attempt a while back to access the necessary equipment but..." | Read more » over 7 years ago
nedhorning "Hi Matthew, It's good to see this interest in PLOTS. A couple other open source (or nearly so) packages related to 3D mapping are: SURE (compatible..." | Read more » over 7 years ago
nedhorning "I just updated the plugin and tested it. I suggest that Andre delete his version of the download Photo_Monitoring.jar and download the fresh versio..." | Read more » over 7 years ago
nedhorning "Hi Adresc4 - I'll try to help you get the plugin working. When you are running Fiji and you click on menu bar Plugins => Photo Monitoring do you..." | Read more » over 7 years ago
nedhorning "Hi Roolark - Make sure you didn't disconnect or tear one of those thin ribbon cables. That's the only thing I can thing of that would cause that pr..." | Read more » over 7 years ago
nedhorning "Hi Roolark - I don't have a spectral sensitivity curve for the A2200. I've been using LEDs to get a rough idea of spectral sensitivity but that's a..." | Read more » almost 8 years ago
nedhorning "Collecting you imagery so it coincides with Landsat 8 imagery is a good idea. MODIS acquires images at roughly the same time as Landsat so that's a..." | Read more » almost 8 years ago