| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| funkycbj | "I just used a StellarNet spectrometer to find the transmittance of hot filters from the Canon A2200 & A2500. Both hot filters rapidly fall off ..." | Read more » | over 9 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 » | over 10 years ago | |||
| funkycbj | "Just so you know, 720nm is in the "red edge" region so you're not computing NDVI. You are computing the Normalized Difference Red Edge Index (NDRE). " | Read more » | almost 11 years ago | |||
| funkycbj | "Light is transmitted but it is diffusely scattered past a certain depth, which seems to be ~7mm. The minimum thickness increases with the size of ..." | Read more » | almost 11 years ago | |||
| funkycbj | "Krylon extra flat black spray paint is diffuse and spectrally flat across the vis-nir. A small sheet of teflon isn't too expensive and works great ..." | Read more » | almost 11 years ago | |||
| funkycbj | "You want to capture enough spectral variation between different surface features. If you only have 2 bands but have several classes then you may ge..." | Read more » | about 11 years ago | |||
| funkycbj | "If you take pictures at higher angles (more perpendicular and less oblique) you may achieve a more Lambertian response. Dealing more directly with ..." | Read more » | about 11 years ago | |||
| funkycbj | "I noticed that you are capturing your test images from an oblique angle. Bidirectional reflectance at that angle may be creating "hot spots" in you..." | Read more » | about 11 years ago | |||
| funkycbj | "A blue filter should be an acceptable alternative to a red filter when measuring vegetation if the spectral response of the blue filter is sensitiv..." | Read more » | about 11 years ago |