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italy
italy


Author Comment Last activity Moderation
cristoforetti "Thanks dhaffnersr, that dimension shouldn't be a problem. Probably I will need to modify a bit the design, shifting the optics 5mm to the left sho..." | Read more » over 6 years ago
dhaffnersr "hey cristoforetti, my web cam's dimension's are 32mm X 32mm, so your project is pretty small I hope it will work, as far as the mirrors, if i were..." | Read more » over 6 years ago
cristoforetti "@dhaffnersr: assuming that the angles are right I think that it will be crucial to have good mirrors reflecting on a wide range of wavelengths with..." | Read more » over 6 years ago
dhaffnersr "This is certainly a very ambitious undertaking. 70X70mm that would be pretty amazing. " | Read more » over 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
LaPa "Hi, 1) unluckily I don't have access to a spectrometer 2) wich are the companies where I can buy a cheap Calibration targets? 3) may it be fine to ..." | Read more » over 6 years ago
LaPa "Thank you Chris, I'm going to read with the attention the Ned Horning's note that you link! Have a good day! LaPa " | Read more » over 6 years ago
cfastie "Sorry I missed some questions. Calibration targets work outside or in a greenhouse. Calibration targets are hard to find and very expensive. But ..." | Read more » over 6 years ago
LaPa "Hi, could it be a good idea to choose as calibration target the bare soil area that is in each (thousands) photos? Best regards LaPa " | Read more » over 6 years ago
LaPa "1) Could be a good idea put the calibration targets of known spectral reflectivity in Greenhouse to include in the photos ? 2) Where can I get the..." | Read more » over 6 years ago
cfastie "NDVI is based solely on color (near infrared is one of the colors). If a camera records different colors for two leaves, the NDVI computed for tho..." | Read more » over 6 years ago