Comments

Author Comment Last activity Moderation
cfastie "I have not tried to stitch Mobius photos nor have I used Photoscan. I have stitched many infrared photos including blue- or red-filtered (NGB or RG..." | Read more » over 5 years ago
cfastie "You can use any filter that blocks most blue and green light (all visible light other than red) and also passes a lot of near infrared light (somew..." | Read more » over 5 years ago
cfastie "Finding inexpensive, do-it-yourself calibration targets is an obstacle to NDVI calibration. You need targets for which the spectral reflectance is ..." | Read more » over 5 years ago
cfastie "Photoshop. Also easy with Fiji. Probably also possible with many photo editing programs. " | Read more » over 5 years ago
cfastie "Trying slightly different values could yield better results in some situations. CLF_SYSCFG.TXT " | Read more » over 5 years ago
cfastie "I agree that the rubber band trick is a very clever hack and a critical way to lower the barriers to entry to remote interval shooting. This resear..." | Read more » over 5 years ago
cfastie "Here is my discussion of calibrating NDVI images: https://publiclab.org/notes/cfastie/05-01-2016/calibration-cogitation And Ned's most recent note..." | Read more » over 5 years ago
cfastie "I am a little confused about some of the suggestions here. I like the advice of using a camera with at least 10MP because it ensures that the came..." | Read more » over 5 years ago
cfastie "There are a few misleading things about these suggestions. The "Easiest" approach to interval shooting might be to use a camera with that feature ..." | Read more » over 5 years ago
cfastie "Structure from motion could be done with ground based photos, especially if the camera was on a tall pole. Multiple photos would be needed which in..." | Read more » over 5 years ago
cfastie "Hi Nicholas, That sounds like it was an exciting hour. If a live video connection to Spectral Workbench is an obstacle, it is always possible to ..." | Read more » over 5 years ago
cfastie "With a blue filter which blocks only red light, the red channel will capture NIR. Use the red channel for NIR and the blue channel for visible ligh..." | Read more » over 5 years ago
cfastie "With a blue filter which blocks only red light, the red channel will capture NIR. Use the red channel for NIR and the blue channel for visible ligh..." | Read more » over 5 years ago
cfastie "Try radish. They are easy to find as garden seeds this time of year. Other mustards are probably good too (cabbage, arugula, any mustard green). Bu..." | Read more » over 5 years ago
cfastie "You might want to specify which scientists you think should be making more contact with the public. Do you mean the scientists who have been accuse..." | Read more » over 5 years ago
cfastie "The basics are described here: https://publiclab.org/wiki/ndvi-plots-ir-kit, and there is more detail in many research notes and comments at this s..." | Read more » over 5 years ago
cfastie "In single-camera NIR systems with a filter that blocks all red or blue, the camera can be adjusted to emphasize the color channel capturing NIR. Th..." | Read more » over 5 years ago
cfastie "Mathew, that diagram is a little misleading. A lens with a 45° field of view (focal length of 44mm equiv.) would capture a photo with a long side e..." | Read more » over 5 years ago
cfastie "How bright is the fluorescence? What color, and how long does it last? Do you shine a light on the leaves to make them fluoresce? What color? How l..." | Read more » over 5 years ago
cfastie "I have used Ned's plugin for Fiji (https://publiclab.org/notes/nedhorning/01-13-2016/packaged-photo-monitoring-plugins-available-on-the-github-repo..." | Read more » over 5 years ago
cfastie "That seems to be one simple way to do it. " | Read more » over 5 years ago
cfastie "It would be possible to make a version of that device. It requires a digital projector which will be an expensive component (but maybe under $100)...." | Read more » over 5 years ago
cfastie "Some light passes through human skin, and near infrared light (especially around 800 nm) passes through more readily than visible light. Skin also ..." | Read more » over 5 years ago
cfastie "The area of ground covered by an aerial photograph depends on both the height of the camera and the focal length of the lens. Lenses typically used..." | Read more » over 5 years ago