Show your support for community science. Donate to Public Lab »


Comments

Author Comment Last activity Moderation
Claytonb "@dannysmith -I have been using the Labsphere Permaflect coated targets http://labsphere.com/labsphere-products-solutions/materials-coatings-2/coati..." | Read more » almost 3 years ago
Claytonb "@Shendry - you are only able to get NIR from that camera. You will need another camera that captures red as well in order to calculate NDVI. There ..." | Read more » almost 3 years ago
Claytonb "@Thorsten I have not tried using a chart like the color checker though I have used materials(plastic, felt, paper) in the shade of red on the chart..." | Read more » over 3 years ago
Claytonb "@Artichoke23 - What I have seen in testing is that a red filter will give you much greater contrast and sensitivity in crop vigor. A good example i..." | Read more » over 3 years ago
Claytonb "@everydayduffy -For the above comparison I used the calibration option in Pix4D pro. It consisted of drawing a region of interest on the image of t..." | Read more » over 3 years ago
Claytonb "Hi Alex, I would recommend contacting Charlie Langlois at Labsphere- clanglois@labsphere.com They can make affordable($300 range)targets that are s..." | Read more » over 3 years ago
Claytonb "@Gianni_Gadaleta - I never did get the chance to have the Komatex scanned so I haven't used it for target material. Becky Done with SABIC Polymersh..." | Read more » over 3 years ago
Claytonb "@AFairbairn - I spent quite some time searching for reliable and cheap target material for calibrations. I spoke with someone who scanned Rustoleum..." | Read more » almost 4 years ago
Claytonb "@bortek -the blue in the NDVI image is related to the value of the color LUT I applied to the image during processing. I did that to help me to see..." | Read more » almost 4 years ago
Claytonb "Here is a similar scene with the Event38 at about the same height. This is with f/4, exp 1/1250, ISO 100 " | Read more » almost 4 years ago
Claytonb "@bortek -I am assuming that the noise is partly due to the filter thickness and light requirement. I believe the Event38 filter is 0.5mm thick and ..." | Read more » almost 4 years ago
Claytonb "@Rayishido -the high NDVI values is a normal occurrence with shadows. You will notice that the NDVI values will change in the shadows depending on ..." | Read more » almost 4 years ago
Claytonb "@Thorsten - you are correct the images were mislabeled. Thanks for the heads up. I have corrected the labels. Thanks again, Clayton " | Read more » almost 4 years ago
Claytonb "The filter size I have in the Canon S100's are 8.9 X 7.9 X 1. The sensor screws are each backed out approximately 3/4 turn from the factory positio..." | Read more » almost 4 years ago
Claytonb "@cfastie Apologies Chris I had to fix the image layout and labels and couldn't edit right so I'm reposting.These are from the MidOpt DB 475/850 and..." | Read more » almost 4 years ago
Claytonb "@cfastie -I can confirm that mounting the filter internally does correct the vignetting problem. I have mounted a DB475/850 and DB660/850 in place ..." | Read more » almost 4 years ago
Claytonb "@cfastie -Hi Chris, Is it possible that the vignetting your seeing is related to wavelength interference due to aperture size? Have you tried a lar..." | Read more » about 4 years ago
Claytonb "@cfastie -Great work Chris. Have you tested to see what your max shutter speed is with the DB filter on a normal sunny day with same ISO or slightl..." | Read more » about 4 years ago
Claytonb "@nedhorning thanks for all your work Ned. I am curious if we can use the usual gray and black cards for white balance as calibration targets and if..." | Read more » about 4 years ago