| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| cfastie | "I'm not sure about your installation problems. Maybe @nedhorning can help. I'm also not sure about the other error. To use two photos to make NDVI..." | Read more » | over 8 years ago | |||
| cfastie | "This is a good example of how the spectrum of incident light influences the NDVI of a scene. Leaves reflect about 10 times more NIR than red, but i..." | Read more » | over 8 years ago | |||
| cfastie | "Those photos look good. I used the Photo monitoring plugin to make the NDVI image below. I used the blue channels from both photos because these pr..." | Read more » | over 8 years ago | |||
| cfastie | "All of the NDVI values are very low. Could you also post the original photos and maybe we can see what kind of NDVI we get. Could you describe what..." | Read more » | over 8 years ago | |||
| cfastie | "Yes I have seen Valspar in the US for many years, and Rustoleum is a big brand here. Maybe there is some international brand of art supplies that m..." | Read more » | over 8 years ago | |||
| cfastie | "Any place that sells paint has paint color chips, but these are too small to be useful as targets. But fancy paint stores have huge color samples. ..." | Read more » | over 8 years ago | |||
| cfastie | "That's a really relevant article. They scale the graphs relative to a standard, so 100% is actually 20% reflectance. That means 25% reflectance of ..." | Read more » | over 8 years ago | |||
| cfastie | "So you already have the result you want, but you have to write another program to do the same thing? I can't help with that, I'm not a programmer. " | Read more » | over 8 years ago | |||
| cfastie | "Define power. what are some possible units of power in this case? Chris " | Read more » | over 8 years ago | |||
| cfastie | "ISO 100, 1/320 shutter speed That is much better than I thought would be possible. I don't know how those skinny little bands provide enough light..." | Read more » | over 8 years ago | |||
| cfastie | "Ned listed some resources of spectral reflectance data of common things in this note: https://publiclab.org/notes/nedhorning/11-01-2013/why-a-red-f..." | Read more » | over 8 years ago | |||
| cfastie | "PeauProductions has this filter here: This must be a dichroic filter. The narrow bands could produce good results. We don't know how much cross ..." | Read more » | over 8 years ago | |||
| cfastie | "It would be good to know something about the camera and filter you are using. Do you have a spectral curve for the filter? How is the camera white ..." | Read more » | over 8 years ago | |||
| cfastie | "Hi ino, Could you post a link to the "bulk IR filter pack?" The Public Lab IR filter pack seems to contain one big piece of red and one big piece ..." | | over 8 years ago | |||
| cfastie | "I answered Mnzr's question here: https://groups.google.com/forum/#!topic/plots-infrared/HfowVn5ULFM " | Read more » | over 8 years ago | |||
| cfastie | "The red filter in your Mobius is blocking most blue light but passing most of the NIR light in the scene. The blue channel receives little other vi..." | Read more » | over 8 years ago | |||
| cfastie | "I am not sure what your question is. I assume the red LEDs emit some NIR, but maybe not very much. With only red and blue LEDs, the amount of NIR r..." | Read more » | over 8 years ago | |||
| cfastie | "Hi Catherine, Thanks for the level-headed summary. I was hoping to engage your students, but then they retreated behind the new “response” tag whi..." | Read more » | over 8 years ago | |||
| cfastie | "Oh, that's great to be able to disable AWB. I don't really know what manual setting would be best for your use. If you are going to be swapping f..." | Read more » | over 8 years ago | |||
| cfastie | "Hi JohnsonC, That is a very intriguing chamber you have. Being able to control the spectral quality of the lighting makes some interesting things ..." | Read more » | over 8 years ago | |||
| cfastie | "For $25 that hydro generator has got to be a good thing. It is an impartial solution for my spring house because it can't freeze (operating range 4..." | Read more » | over 8 years ago | |||
| cfastie | "That hydro generator says it needs 3 liters per minute, which we have. Sorry about revealing your irrelevance. Also, we wouldn't need the internet..." | Read more » | over 8 years ago | |||
| cfastie | "Why does this work when the two wires (the extension cord) are insulated? It must be that the electric field extends outside the wires into the wat..." | Read more » | over 8 years ago | |||
| cfastie | "Don have you described somewhere how in the world this thing measures water depth? I need this and I discovered today that my spring house up in th..." | Read more » | over 8 years ago |