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raspberry
raspberry


Author Comment Last activity Moderation
cfastie "I haven't used the Pi NoIR cam and have not seen your photos, so I can only respond from general principles. Camera sensors are not as sensitive ..." | Read more » about 5 years ago
warren "Just wanted to say this looks really cool! " | Read more » about 5 years ago
aldrin "sir, do you now the right values of white balance in pi noir in capturing ndvi? " | Read more » over 5 years ago
jfd "nice work! " | Read more » over 5 years ago
thechapu "@carolccarvalho mi nombre es Cristofer, soy de Chile. Llevo 2 años usando raspberry y mas de 1 año aprendiendo sobre NDVI, en la Universidad tuve u..." | Read more » almost 6 years ago
cfastie "Most surfaces reflect both NIR and visible light. Ideally you would have some targets that reflect various amounts of both and you would know the p..." | Read more » about 6 years ago
carolccarvalho "Hi Chris, thanks again! Which are the surfaces that reflect both blue and NIR light? Could you give me some examples? And about mobius camera, i ..." | Read more » about 6 years ago
cfastie "1) When you said shortcut, you meant I could for example use a blue led or a blue paint as target? Or do you have another suggestion? An LED or ot..." | Read more » about 6 years ago
carolccarvalho "Hi Chris, thank you very much for the help! I'll choose better times and avoid shadows the next flight. And I'll try correcting the exposure too! ..." | Read more » about 6 years ago
cfastie "Those NDVI images look reasonable. Deep shadows are not being handled very well so they are assigned NDVI values of 1.0 (magenta) or apparently -1...." | Read more » about 6 years ago
LaPa "I removed, at the moment, the camera from the greenhouse. I took thousands of IR photos (every 10 minutes for more then a month) I got a movie ( h..." | Read more » over 6 years ago
cfastie "A DIY spectrometer can be used to characterize the spectral reflectivity of a target if two things are true: The spectrometer must be sensitive i..." | Read more » over 6 years ago
LaPa "Thank all of you for the suggestions Maybe it is the wrong strumentation but i don't know: 1) If I buy your http://store.publiclab.org/products/de..." | Read more » over 6 years ago
nedhorning "Hi LaPa - You can contact me at horning@amnh.org and I will send you the spectra. You can also look at this research note for links to sites with ..." | Read more » over 6 years ago
LaPa "Thank you Nedhorning, nice to see your answers in the my research note! I'm reading your notes about calibration trying to understand more about ND..." | Read more » over 6 years ago
nedhorning "I have the reflectance spectral for these materials and can provide a PDF, Excel, or CSV file of the spectra if someone lets me know a good way to ..." | Read more » over 6 years ago
LaPa "If anyone in PublicLab has a spectrometer and can get the proper calibration targets I could buy it. " | Read more » over 6 years ago
mathew "The paints are for making consistent whites and greys that will be the same perceptual color across a wide variety of lighting conditions. They are..." | Read more » over 6 years ago
cfastie "Mathew, I haven't seen any spectral data for Rosco paints. Is there any reason to think that they would be better than other paints for NDVI calibr..." | Read more » over 6 years ago
mathew "well, B&H will sell it to you by the gallon. pricey to try out. $42-95 a gallon, but it sure will make a lot of targets. I tried to get chip..." | Read more » over 6 years ago
LaPa "ok, THANKS all of you for the answers. I like that my research note elicits answers that can also affect other. I am interested to make experiences..." | Read more » over 6 years ago
cfastie "It would be great to have a few paints that: had reflectance spectra for 400 nm to 1000 nm, were exterior paint, were matte finish paint, were av..." | Read more » over 6 years ago
mathew "I haven't played around with it, but I'd assume a neutral gray "TV White" and "TV black" paint like these for TV camera calibration would be the be..." | Read more » over 6 years ago
cfastie "I don't know of any commercially available inexpensive calibration targets. A good calibration target will have the same reflectance for all wavele..." | Read more » over 6 years ago