| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| cfastie | "That's a cool idea. I'm sure somewhere in the gradient from near to far the NDVI in these images is correct. " | Read more » | over 10 years ago | |||
| nedhorning | "You could try to use some of these for calibration using Landsat imagery to estimate NDVI. " | Read more » | over 10 years ago | |||
| mark9700 | "Hello Everybody Quite interesting materials ! " | Read more » | over 10 years ago | |||
| eustatic | "so sad! haha " | Read more » | over 10 years ago | |||
| gbathree | "We do, I just put up the Arduino code - https://github.com/Photosynq - see the "Arduino Protocols" repository. It's still very under development,..." | Read more » | over 10 years ago | |||
| warren | "Hi Greg - do you have any code online yet? " | Read more » | over 10 years ago | |||
| warren | "Wow, looks great and I'm eager to see the software as well! I'll be at the OHS... see you there! " | Read more » | over 10 years ago | |||
| gbathree | "We do have some information about the unit itself and the science behind it if you go to our project page at https://opendesignengine.net/projects/..." | Read more » | almost 11 years ago | |||
| webbhm | "Do you have any information on your instrument, how you take the chlorophyll readings? I see a good bit on how you are wanting to automate the dat..." | Read more » | almost 11 years ago | |||
| cfastie | "Excel allows nesting if statements, so: if((if(red>green,red,green))>blue,(if(red>green,red,green)),blue) should work, if you're not int..." | Read more » | about 11 years ago | |||
| cfastie | "=max(blue:red) is soo much easier. Thanks. The greater of three method seems to be useful for transmission or absorption spectra when a continuous..." | Read more » | about 11 years ago | |||
| cfastie | "Dan, you are correct that all we want to know is how the light intensity varies across the sensor where the grating has spread out the spectrum. Un..." | Read more » | about 11 years ago | |||
| warren | "The Bayer filter is frustrating, but if we can figure it out, it might be a hidden plus for us; in some ways, the R, G, and B channels can be treat..." | Read more » | about 11 years ago | |||
| danbeavers | "Perhaps I missed the explination but please help me understand why you don't just sum the 3 bands. It seems to me that the operative filter is the ..." | Read more » | about 11 years ago | |||
| Tom_H | "I think the essence here is that you have to watch carefully what is going on and choose a method that seems most appropriate for the situation. Th..." | Read more » | about 11 years ago | |||
| Tom_H | "Blown out data should show up as 255 in the csv file and thus would appear in a graph as peaks with a flat top (plateau) when graphed in excel, and..." | Read more » | about 11 years ago | |||
| Tom_H | "A simpler formula is: =max(red:blue) " | Read more » | about 11 years ago | |||
| cfastie | "Tom, I'm glad you asked. The proper Excel expression for choosing the greatest among three values did not come to me quickly, so I just used the eq..." | Read more » | about 11 years ago | |||
| Tom_H | "Hi Chris, How did you pick the color channel with the highest value? Did you write an expression for Excel to pick the highest value and use that? ..." | Read more » | about 11 years ago | |||
| cfastie | "I guess they plate the stainless steel mesh with gold to keep metallic flavors out of your tea (also used for coffee filters). I noticed it in the ..." | Read more » | about 11 years ago | |||
| danbeavers | ""I filtered it through a gold tea strainer" Man, I can't hold a candle to that! " | Read more » | about 11 years ago | |||
| danbeavers | ""I filtered it through a gold tea strainer" Man, I can't hold a candle to that! " | Read more » | about 11 years ago |