plant-health
plant-health


Author Comment Last activity Moderation
cfastie "Thanks Bryan. You're right that NDVI rose to fame as a satellite and airborne tool, and has only recently been used more widely at close range. It ..." | Read more » over 9 years ago
btbonval "Woops I skipped the part at the top where it seems to suggest in advertisement language that the PhotosynQ gives you this and more! Any chance you..." | Read more » over 9 years ago
btbonval "This is a really good collection of information about photosynthesis and spectral analysis. My understanding was that NDVI has largely been used f..." | Read more » over 9 years ago
aguchosolano "Thanks! " | Read more » over 9 years ago
natalie "Yes that's correct. We have about 100 of the Infrablu filters left. After those are gone, all the new Infragrams have one each of #74, and #19. " | Read more » over 9 years ago
warren "Hi, aguchosolano - the Public Lab store ships internationally and will send Rosco #74 or #2007. I believe they're going to start shipping #19 as we..." | Read more » over 9 years ago
aguchosolano "Thanks cfastie! I am from Argentina, so I will try to contact providers that could send the filters to my country. " | Read more » over 9 years ago
cfastie "Theatrical gels are a good substitute for more precise filters. Rosco #19 "Fire" behaves much like Wratten 25A and costs $7.00 for a huge (20x24") ..." | Read more » over 9 years ago
aguchosolano "Hello! Is there any "easy to find" material that I could use to take some pictures and calculate the NDVI? I mean, before buying expensive filters ..." | Read more » over 9 years ago
cfastie "@camilochiang, Yes, you are correct that with a blue Rosco filter, the photo captured by the converted camera is (more or less) NGB. I think the di..." | Read more » over 9 years ago
camilochiang "Hi cfastie! I really think that your work is pretty awesome and for that im trying to do some experiments with the NoIR camara and your "Rosco filt..." | Read more » over 9 years ago
patcoyle "Nice indeed! What tools are you using to stitch the images? " | Read more » over 10 years ago
warren "Wow, very nice map! How have you modified the a495? " | Read more » over 10 years ago
bc512 "for free of course, that above sounded a lot like business talk haha, But no i am just happy to help! " | Read more » over 10 years ago
cfastie "kykytos, This is a really good question. Lots of blue light can pass through a #2007 filter, so a white light viewed through the filter will appear..." | Read more » over 10 years ago
kykytos "Hi, I don't understand how can be blue color the Rosco #2007 VS Blue filter when it allows blue light to pass. We see the color of the objects beca..." | Read more » over 10 years ago
warren "BTW, this post is now the 7th most popular research note (by view count) on the site! " | Read more » over 10 years ago
cfastie "In fact it was just one dirt road, State Route 8, the Denali Highway. 135 miles of dust. " | Read more » over 10 years ago
warren ":-) you would've gotten there a lot faster if you hadn't pulled over so often! You drive a lot of dirt roads!! " | Read more » over 10 years ago
cfastie "Hi jalarid, Yes that is correct. There is lots of active development about which cameras and filters work best, and how to get the most meaningful ..." | Read more » almost 11 years ago
warren "That's right, jalarid! " | Read more » almost 11 years ago
jalarid "Hi, so if I am understanding this correctly I only need to remove the IR filter from my camera and replace it with Rosco #2007 VS Blue filter. At t..." | Read more » almost 11 years ago
mathew "kykytos-- I put Chris out of the filter business . If you are interested in helping us do research on filters, please e-mail me. mathew at publiclab " | Read more » almost 11 years ago
cfastie "kykytos, Sorry, I am out of the business of mailing #2007 filter. We are currently testing several different filters with different cameras to choo..." | Read more » almost 11 years ago