| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| nedhorning | "I don't have experience with lens mounted filters but you might get some feedback if you post your question on the plots-infrared list at http://pu..." | Read more » | about 9 years ago | |||
| zeigerpuppy | "I am thinking of getting a modified DSLR for NDVI imaging and am having trouble deciding between two different options - camera with Schott BG3 fil..." | Read more » | about 9 years ago | |||
| WhiteRabbit | "Ned, Thanks very much for posting this research note. I found it to be helpful background for a related topic (http://publiclab.org/notes/WhiteRa..." | Read more » | almost 10 years ago | |||
| funkycbj | "A blue filter will give better results if red or yellow flowers are present because the flower reflectance mixes with the leaf reflectance and defl..." | Read more » | about 10 years ago | |||
| nedhorning | "Hi Thorsten, Glad to hear you're making progress. When you run the plugin are you specifying that the channel from the visible image to use for th..." | Read more » | over 10 years ago | |||
| Thorsten | "Ned, I followed your advice and now have processed my first dual camera images (RGB and 850nm IR) using your PhotoMonitoring plugin, which works li..." | Read more » | over 10 years ago | |||
| nedhorning | "Is this your conclusion or do we have to test lots of other materials that commonly show up in the NDVI images we take? I have looked at a lot of..." | Read more » | over 10 years ago | |||
| nedhorning | "Chris, So many questions... I think more testing is necessary but I'll take a shot at answering each question. I'd like to hear what other folks th..." | Read more » | over 10 years ago | |||
| cfastie | "Ned, The NDVI image made from the Rosco 2008 photo by stretching the histograms is surprisingly similar to your calibrated NDVI image from the red ..." | Read more » | over 10 years ago | |||
| 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 | |||
| nedhorning | "If you use a dual-camera setup I suggest using an unmodified camera and a NIR-pass (visible cutoff) filter for the other camera. Some people use un..." | Read more » | over 10 years ago | |||
| Thorsten | "Ned, thanks! Confusion is good in most cases! :-) I think I'll give it a try and report. For such a setup do you propose the filters you used (bl..." | 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 | |||
| nedhorning | "Hi Thorsten, Sorry for the confusion. Some of the non-linearity between the response of the red and blue filter should be explained in the post I d..." | Read more » | over 10 years ago | |||
| Thorsten | "Dear Ned et al., I am pretty new to all this and on my way to convert my camera for NDVI mapping. After reading this post I am little confused: bl..." | Read more » | over 10 years ago | |||
| mathew | "This is great, Ned-- thanks for illustrating it with your examples. The stark difference between NDVI of dead grass in the red channel is a pretty..." | Read more » | over 10 years ago | |||
| nedhorning | "One drawback of using the red filter is that the red part of the bayer filter passes more NIR than the blue or green parts. I'm looking into ways t..." | Read more » | over 10 years ago | |||
| patcoyle | "Interesting work. Thanks Ned. " | Read more » | over 10 years ago | |||
| warren | "Wow, this is an exciting development. I had wondered about using red instead of blue, but your results are compelling. I also wonder if this would ..." | Read more » | over 10 years ago |