| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| 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 » | about 8 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 » | about 8 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 » | about 8 years ago | |||
| LaPa | "If anyone in PublicLab has a spectrometer and can get the proper calibration targets I could buy it. " | Read more » | about 8 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 » | about 8 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 » | about 8 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 » | about 8 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 » | about 8 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 » | about 8 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 » | about 8 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 » | about 8 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 » | about 8 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 » | about 8 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 » | about 8 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 » | about 8 years ago | |||
| viechdokter | "The last point would be easiest to test: test a no-brand lamp with the same setup and the same power source and do the same stats on the results. " | Read more » | about 8 years ago | |||
| warren | "Great questions. I do think @stoft is mostly interested in intensity stability for the moment but both are good questions. I'm interested in wheth..." | Read more » | about 8 years ago | |||
| viechdokter | "Yeah I had a look at stoft's post and was very impressed about his orderly and organised way of doing things. I built my spectrometer 3 weeks ago a..." | Read more » | about 8 years ago | |||
| warren | "Wow, this is so great to see very close to @stoft's post: https://publiclab.org/notes/stoft/04-14-2016/spectrometer-stability Were you able to ass..." | Read more » | about 8 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 » | about 8 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 » | about 8 years ago | |||
| LaPa | "Thank a lot all of you for the consideration and the suggestions! Chris, sincerely I didn't understand from your reply if you consider my directio..." | Read more » | about 8 years ago | |||
| liz | "Hi @LaPa, great to see your note! I'm tagging some other raspberry pi developers @rjstatic and @seankmcginnis " | Read more » | about 8 years ago | |||
| cfastie | "Hi LaPa, Your time-lapse videos are impressive. These are excellent teaching videos. You can clearly see that the NDVI values for the foliage of t..." | Read more » | about 8 years ago |