Author | Comment | Last activity | Moderation | ||
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cfastie | "It looks like the computed index will no longer be between -1 and +1 if you adjust the red value that way. Do you then have to rescale the index so..." | Read more » | over 9 years ago | |||
cfastie | "Oh and the controller (SkyShield plus Nano) should have Velcro loops underneath to match hooks on the top of the frame. I think I included a second..." | Read more » | over 9 years ago | |||
cfastie | "Excellent progress. Everything looks good. The Picavet shaft should be tight so it does not slip. Once it is in place, there is not much reason to ..." | Read more » | over 9 years ago | |||
cfastie | "For an S100, the center of the tripod screw hole should be 5.3 cm from the close end of the camera tray (the end that attaches to the servo). That'..." | Read more » | over 9 years ago | |||
cfastie | "Wow, USPS is fast. It looks like you already did a little assembly. How hard was it to screw on the orange leg brackets? And you added a camera! So..." | Read more » | over 9 years ago | |||
cfastie | "Hi Tgran, I agree that we are probably reinventing the wheel. There seems to be a huge range of comfort with this type of simple electronics, So p..." | Read more » | over 9 years ago | |||
cfastie | "That's pretty gutsy flying right there in the hood. Very impressive. The default mode (Mode 0) has eight pan positions. The A495 needs more than t..." | Read more » | over 9 years ago | |||
cfastie | "Nice mosaics. Where are you flying from? The street? I don't see any park nearby. Which mode were you using? it looks like there might not be enou..." | Read more » | over 9 years ago | |||
cfastie | "For a photos from a red-filtered camera like the bluish photo above, in the Photo Monitoring plugin select the red channel to represent red and the..." | Read more » | over 9 years ago | |||
cfastie | "Nice mosaics. The color images seem to have a typical range of colors. These look like good results. Can you explain why you were expecting someth..." | Read more » | over 9 years ago | |||
cfastie | "Oh, that's what's happening. I wondered how it worked at all in Chrome without Silverlight support. In all other browsers you see overlays of zooma..." | Read more » | over 9 years ago | |||
cfastie | "RQ, The white balance looks good. I think those are the settings used by Public Lab. But experimenting with similar numbers could produce better r..." | Read more » | over 9 years ago | |||
cfastie | "In a sense these sensors all have zero lag. As soon as the the materials that make up the sensor reach ambient temperature, the sensor will tell yo..." | Read more » | over 9 years ago | |||
cfastie | "Yikes. You never did like Picavets did you? I can see that the relationship is not moving in a positive direction. One of you two needs to start sh..." | Read more » | over 9 years ago | |||
cfastie | "I found that image in Googleland, I'm not sure where. Wikipedia has a complete article with lots of references: http://en.wikipedia.org/wiki/Sunlight " | Read more » | over 9 years ago | |||
cfastie | "@fgiorlando, I assume the Hoya 25A filters are just as good as Wratten 25A filters for infrared photography. The Hoya glass filters would produce c..." | Read more » | over 9 years ago | |||
cfastie | "There seems to be a lot of marketing hooey at the Agribotix site. They seem to be doing DIY uncalibrated infrared vegetation index work like a lot ..." | Read more » | over 9 years ago | |||
cfastie | "The angle from which the photo is taken and the angle of the sun do influence the NDVI result. NDVI values are a function of how much red and NIR l..." | Read more » | over 9 years ago | |||
cfastie | "Stretching the histograms of either the NIR or VIS (or both) channels used to make NDVI is a trick that can produce more meaningful NDVI. I don't k..." | Read more » | over 9 years ago | |||
cfastie | "I can't help much with the infragram.org process. It seems to be pretty easy to produce an image that doesn't have any obvious relationship to the ..." | Read more » | over 9 years ago | |||
cfastie | "Excellent @patcoyle. I'll ship it tomorrow. Do you know which camera you are likely to use on it? " | Read more » | over 9 years ago | |||
cfastie | "A standard coefficient is a tough nut. The amount you would want to shift the NDVI values will differ a lot among photos. Exposure and color balanc..." | Read more » | over 9 years ago | |||
cfastie | "Yes, I can't say much without seeing the originals. Someone familiar with what infragram.org does might be able to infer something. When I follow ..." | Read more » | over 9 years ago | |||
cfastie | "That looks like a photo taken with a red filtered infrared camera. It is very hard to get meaningful NDVI results directly from this photo because ..." | Read more » | over 9 years ago |