| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| eymund | "This was a classic case of having to be very careful when interpreting aerial photographs. There really was an concealed outflow at this location, ..." | Read more » | over 10 years ago | |||
| liz | "@eymund , would you like to respond? " | Read more » | over 10 years ago | |||
| bsugar | "I've been re-reading a bunch of entries to re-familiarize myself with the NIR camera and a rather simple question about this plume occurred to me w..." | Read more » | over 10 years ago | |||
| gpenzo | "Hallo Albertazzi I bought a 30mm glass filter. Remove the housing of the filter and glue it in front of my cam. See pictures above (No idea how to ..." | Read more » | over 10 years ago | |||
| Albertazzi | "Very interesting results! I have some questions, so n°1: you bought that filter online, and then simply cutted it so it fit the lens shape in the f..." | Read more » | over 10 years ago | |||
| fevegal | "Nice Job. Some questions, do you have any problem with autofocus in the IR camera?. How do you do to remove IR sensor filter in A2500? " | Read more » | almost 11 years ago | |||
| gpenzo | "Hello Chirs. I used a glass filter indeed. They where arround 24 euro. I will use a 3DR Pixhawk to trigger the cameras. The cams do not have gps th..." | Read more » | almost 11 years ago | |||
| cfastie | "You are going to make a lot of people envious with your lovely crisp images. The NIR photo looks as sharp as the VIS version, so I guess you have a..." | Read more » | almost 11 years ago | |||
| Tbtouaki | "Hi I have several filters to put in front of the lenses and was considering which to put inside, to replace the IR filter. Thank you so much for ..." | Read more » | almost 11 years ago | |||
| cfastie | "Tbtouaki, It sounds like you have a full spectrum camera, one that has the IR blocking filter removed and nothing replacing it. By placing a filte..." | Read more » | almost 11 years ago | |||
| Tbtouaki | "How do you swap channels in an unmodified camera from RGB to NIR? What kind of camera are you using? I am really interested in this, I am photograp..." | Read more » | almost 11 years ago | |||
| andresc4 | "Hey great work!!! Im new into NDVI, im working with a hexacopter and a dual camera setup.... i would like to ask you, what cameras did you use and..." | Read more » | almost 11 years ago | |||
| nedhorning | "Hi Roolark - I don't have a spectral sensitivity curve for the A2200. I've been using LEDs to get a rough idea of spectral sensitivity but that's a..." | Read more » | almost 11 years ago | |||
| Roolark | "@Ned, do you already have a spectral sensitivity curve for the canon A2200, with its ir block filter removed (similar to the Nikon curve above)? If..." | Read more » | almost 11 years ago | |||
| Dongjie | "cfastie, yes, I am referring for that. Thanks for your information. :) " | Read more » | almost 11 years ago | |||
| cfastie | "Dongjie, are you referring to the gigapans? They are gigapans embedded here from gigapan.com. " | Read more » | almost 11 years ago | |||
| Dongjie | "cool, how do you make the figure like Google streetmap? " | Read more » | almost 11 years ago | |||
| mathew | "cool test! this is definitely the most pixels in a research note, as far as I've seen. " | Read more » | about 11 years ago | |||
| mathew | "I think doing calculations based on red and green might be two ways to get to the same result that Chris was seeking in his Oaktober note-- the cha..." | Read more » | about 11 years ago | |||
| warren | "It's weird because we think of green being reflective, but compared to IR, it's very absorbent. " | Read more » | about 11 years ago | |||
| cfastie | "Mathew, That does seem to be a consistent pattern. I think you are right that a green filter might offer the purest visible light channel in a sing..." | Read more » | about 11 years ago | |||
| mathew | "looking at the sensor sensitivity graph for the Nikon D200, its interesting that green is the least sensitive channel in the infrared band, implyin..." | Read more » | about 11 years ago | |||
| cfastie | "Hi Pat, The Wratten 25A is an old standard photographic filter that is still widely available in glass and gel. I think Ned bought a genuine Kodak ..." | Read more » | about 11 years ago | |||
| patcoyle | "Thanks Chris and Ned, this is an encouraging line of inquiry. Remind me on the source for the Wratten 25 filter material, or is it in the prior not..." | Read more » | about 11 years ago |