Comments

Author Comment Last activity Moderation
warren "I posted an activity for doing NDVI-like work using a camera like this -- with a coefficient (on the output of NDVI, so like "boosted" NDVI) here: ..." | Read more » almost 4 years ago
warren "Probably! Can you point me at a MODIS source with bands youre interested in? " | Read more » about 4 years ago
warren "@wward1400 @adam-griffith @MicheleTobias @lprashad @eustatic @nedhorning @cfastie you might like this little experiment too! " | Read more » about 4 years ago
warren "@ccpandhare @tech4gt exciting! @jbreen - you'd know this... are there any tiles available for LANDSAT's near-infrared bands? Especially like NGB t..." | Read more » about 4 years ago
warren "Ah! https://publiclab.org/notes/cfastie/08-20-2013/white-balance-recovery Flashback! " | Read more » over 4 years ago
warren "I guess to evaluate how well the 2x blue boost I posted above worked, we'd have to compare it to a better system, right? If other folks take a phot..." | Read more » over 4 years ago
warren "Hmm, could we manually multiply the blue channel by 2 or 3 to do a "post-processed white balance"? Of course this would need to be calibrated, but ..." | Read more » over 4 years ago
warren "Incandescent white balance seems to work all right! But wait, here it is in NDVI using http://infragram.org -- black is zero NDVI, white is 1.0: ..." | Read more » over 4 years ago
warren "@amanda and I did a take apart session and this is pretty easy to do with a good pair of pliers -- wire strippers worked well! " | Read more » over 4 years ago
warren "Does anyone have some more photos of this conversion process we could show here, more step-by-step? " | Read more » over 4 years ago
warren "Just linking this up with @nedhorning who has done a lot since!! " | Read more » almost 5 years ago
warren "Also see this page collecting cheap cameras of this type: https://publiclab.org/questions/warren/05-20-2017/cheap-lightweight-gopro-alternatives-fo..." | Read more » about 5 years ago
warren "These or similar cameras are as low as $40 now! https://www.amazon.com/gp/aw/d/B01DG9UMS6/ref=mp_s_a_1_2?ie=UTF8&qid=1497436247&sr=8-2&..." | Read more » about 5 years ago
warren "Also do you have any pics you took with the camera to share? Raw and NDVI for comparison? Thank you!!! " | Read more » over 5 years ago
warren "Wow, amazing -- do you have a link to where you can buy this camera, and any data on how much it weighs? It could be a great alternative for people..." | Read more » over 5 years ago
warren "What I did to compare is to calibrate on a CFL, then scan a tube fluorescent, so that the methodology for calibration is the same: https://spectra..." | Read more » about 6 years ago
warren "Actually this looks calibrated, no? " | Read more » about 6 years ago
warren "that continuous band on the blue spectrum gives poor calibration Dave, I don't think it's quite accurate to say that they give poor calibration. T..." | Read more » over 6 years ago
warren "Can you try re-calibrating this one, as I think it was calibrated during a brief bug (it shows being calibrated on 1/26/16) which was since fixed. ..." | Read more » over 6 years ago
warren "Hi, Matej - it also looks like some of your spectra are not calibrated, or perhaps not properly? I'm seeing some not aligned. But all of them seem..." | Read more » over 6 years ago
warren "Adam Griffith reported back that: Beaufort County, SC contracted with Fugro Earth Data for the image acquisition. This is a very expensive techniq..." | Read more » over 11 years ago