| 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 » | about 11 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 » | about 11 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 » | about 11 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 » | about 11 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 » | about 11 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 » | about 11 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 » | about 11 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 » | about 11 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 » | about 11 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 » | about 11 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 » | about 11 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 » | about 11 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 » | about 11 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 » | about 11 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 » | about 11 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 » | about 11 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 » | about 11 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 » | about 11 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 » | about 11 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 » | about 11 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 » | about 11 years ago | |||
| cfastie | "Awesome, they have a customer for the garage sale. " | Read more » | about 11 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 » | about 11 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 » | about 11 years ago |