Comments

Author Comment Last activity Moderation
cfastie "Ned, this is good evidence that some materials, like grass clippings and pine boards, will be more easily distinguished from live green plants in N..." | Read more » over 10 years ago
cfastie "This is really good information. Another thing that might make red filters a good choice is that it is easier to make a red filter than an infrablu..." | Read more » over 10 years ago
cfastie "That's a much better filter for the job: It would be great to try some before all the greenery disappears. " | Read more » over 10 years ago
cfastie "Oh yeah, I forgot I actually measured that, and you're right a little more NIR gets into the blue channel (I used a 735nm cutoff filter). I need to..." | Read more » over 10 years ago
cfastie "I am confused about the idea of using a red filter instead of blue in a one camera NDVI system. Is the idea to use the red channel for visible ligh..." | Read more » over 10 years ago
cfastie "Ned, This is really good data. The primary result seems to be that the calibration procedure works incredibly well. Similar NDVI results are produ..." | Read more » over 10 years ago
cfastie "That's a cool idea. I'm sure somewhere in the gradient from near to far the NDVI in these images is correct. " | Read more » over 10 years ago
cfastie "Ned, This is a substantial advance, and an excellent explication of it. I like your statement of the problem – that what we have been doing with th..." | Read more » over 10 years ago
cfastie "Andrew -- good point about motion blur. I see your nice shot of the stadium was taken at 1/20th second. Last night I tried to take cityscape photos..." | Read more » over 10 years ago
cfastie "For an after dark flight you might want: the highest ISO available Manual exposure with a slow shutter (maybe 1/160 second) and widest aperture, ..." | Read more » over 10 years ago
cfastie "I didn't know you could buy a photodiode array for that little money. Fifty dollars for parts is a great deal. If there were explicit instructions ..." | Read more » over 10 years ago
cfastie "Ned, Those orthomosaics are terrific. There sure were a lot of canoes on the river that day. Was the big one made using the GPS data in the EXIF h..." | Read more » over 10 years ago
cfastie "The NDVI image looks pretty good to me, but I don't know much about your process or expectations. Fill us in and we might be able to help (guidelin..." | Read more » over 10 years ago
cfastie "The infrablue photos from the camera for this scene is here: http://publiclab.org/notes/warren/05-27-2013/infragram-test-photos-from-a-plane-window " | Read more » over 10 years ago
cfastie "Great to know a blue sky can produce a white balance setting with so much separation of the blue and red (NIR) channels. there is at least one othe..." | Read more » over 10 years ago
cfastie "Wow, you must have used something really blue to white balance. Please let us know how you did that. The Infragram is definitely orange. It looks l..." | Read more » over 10 years ago
cfastie "Infragram immersion helmets are the best thing ever. Imagine one with multiple cameras: one zoomed in, one with a different filter, two side facing..." | Read more » over 10 years ago
cfastie "Your results are really good now. I agree that they would probably improve if the images straight from the camera were a little more orangey. To ac..." | Read more » over 10 years ago
cfastie "That's a good question. I updated the wiki page to make it clear that the white balance procedure should be done on an Infragram camera with the bl..." | Read more » over 10 years ago
cfastie "Okay. I think the A490 allows custom white balance. It will make a big difference to follow the procedure here and make your own custom white bal..." | Read more » over 10 years ago
cfastie "That is a good looking image. You are correct that this image paints everything with a narrow range of colors, which means that most of the NDVI va..." | Read more » over 10 years ago
cfastie "Awesome, they have a customer for the garage sale. " | Read more » over 10 years ago
cfastie "The balloon was just launched this morning. All 20 panels were installed yesterday. Well done. Update: I counted wrong; only 19 went up yesterday. " | Read more » over 10 years ago
cfastie "Maybe in a future enhancement the top 10 or 20 matches could be reanalyzed to check for this type of false positive. The reanalysis could be either..." | Read more » over 10 years ago