Comments

Author Comment Last activity Moderation
nedhorning "For calibration I think the most important factor with white balance is that you keep it the same for an entire mission. An advantage to using the..." | Read more » over 4 years ago
nedhorning "Hi Suman, I haven't tried applying calibration coefficients in any sort of rigorous way to adjust white balance. All of my calibration work has bee..." | Read more » over 4 years ago
nedhorning "Ok - That site was taken off line last year I think - sorry. " | Read more » over 6 years ago
nedhorning "Hi Dj - Can you let me know which link you refer to? I have a few scripts that mostly deal with image classification and regression at https://bitb..." | Read more » over 6 years ago
nedhorning "The value of camera calibration depends on what you're doing. If you're just looking for relative differences across an image calibration isn't all..." | Read more » over 6 years ago
nedhorning "Hi Giovanni - You should be able to use the photo monitoring plugin to process images from different cameras even if the cameras have different se..." | Read more » over 6 years ago
nedhorning "Hi - Using a field spectroradiometer for getting reflectance values of targets is a good idea. It would probably be best if you can take reflectanc..." | Read more » over 6 years ago
nedhorning "Thanks for the suggestion. Maybe a teflon sheet is the way to go although I don't have any experience with these. Some of the thin sheets seem tran..." | Read more » almost 8 years ago
nedhorning "I have been making some progress toward standardized calibration targets. Does anyone viewing this know of a source for inexpensive paints/coatings..." | Read more » almost 8 years ago
nedhorning "I'm curious why you need at least 3 bands for automated classification. I don't have a specific classification task in mind. In general I'm working..." | Read more » almost 8 years ago
nedhorning "That's a good observation. The hotspot in these test images would tend to be toward the bottom around the shadow from Chris' head since that's wher..." | Read more » almost 8 years ago
nedhorning "If it's sunny tomorrow I'll be out with the wood, tar paper and other things. With a little luck I'll have a research note before the end of the we..." | Read more » almost 8 years ago
nedhorning "I got a 3" x 3" Wratten 25A gel filter on ebay for $10. There's a lot left over if you want to try it. " | Read more » almost 8 years ago
nedhorning "Chris - It's interesting that you find that the Canon Powershots don't record much NIR in the blue channel. I found just the opposite - that the bl..." | Read more » almost 8 years ago
nedhorning "Thanks for your comments. I am rethinking the idea that a blue filter is sensitive to chlorophyll absorption. Blue wavelengths have similar reflect..." | Read more » almost 8 years ago
nedhorning "Thanks for the comments Chris. I would be a little cautious drawing more than very broad conclusions at this point. The reflectance values for the ..." | Read more » almost 8 years ago
nedhorning "Thanks for the comments Chris. I might have overstated the influence that different shutter speed, aperture and ISO could affect NDVI but I expect ..." | Read more » almost 8 years ago