| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| nedhorning | "Good stuff. From my perspective NDVI is good for mapping vegetation and can provide some indication of overall health and is good at differentiatin..." | Read more » | almost 10 years ago | |||
| 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 » | almost 10 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 » | almost 10 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 » | almost 10 years ago | |||
| aguchosolano | "Thanks! " | Read more » | almost 10 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 » | almost 10 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 » | almost 10 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 » | almost 10 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 » | almost 10 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 » | almost 10 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 » | about 10 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 » | about 10 years ago | |||
| patcoyle | "Nice indeed! What tools are you using to stitch the images? " | Read more » | about 11 years ago | |||
| warren | "Wow, very nice map! How have you modified the a495? " | Read more » | about 11 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 » | about 11 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 » | about 11 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 11 years ago | |||
| warren | "BTW, this post is now the 7th most popular research note (by view count) on the site! " | Read more » | over 11 years ago | |||
| cfastie | "In fact it was just one dirt road, State Route 8, the Denali Highway. 135 miles of dust. " | Read more » | over 11 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 11 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 » | over 11 years ago | |||
| warren | "That's right, jalarid! " | Read more » | over 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 » | over 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 » | over 11 years ago |