Gender
Male
About
Location
Pendleton, OR
Please tell us a bit about your UAV interest
I did some UAV work as part of my job with the USDA.
Hometown:
Jacksonville
Activity Feed
"Contrary to Airwolf's assertion, I never saw this study or commented on it before it was posted here. That said, his research design was excellent and helps advance our understanding of camera modification and NDVI calibration. I can't fault his…"
"This is a thorough comparison. However, you conclude that a gap is closing yet you will not perform a more in depth comparison due to band availability. Given the band availability issue you raised, does it make sense to refer to "the gap" as "the…"
"If you can afford 2-3 sheets then go ahead. The thicker the sheet the better.
Gray spray: if the paint is matte and the aluminum is rough then it should be approximately Lambertian. You'll never neutralize specular components.
Large enough:…"
Gray spray: if the paint is matte and the aluminum is rough then it should be approximately Lambertian. You'll never neutralize specular components.
Large enough:…"
"Mario, after you factor in the cost of the modified cameras (S100s, etc.) and the time you spend it makes more sense to me just to buy the MicaSense camera, especially if you are going to use it for commercial use. Also, it would help instill…"
"Martin,
1) It accounts for light levels by normalizing imagery to a common reference. The panel is serving as a proxy for irradiance (reflectance = radiance/irradiance); however, it is not total irradiance unless it is made out of spectralon or…"
1) It accounts for light levels by normalizing imagery to a common reference. The panel is serving as a proxy for irradiance (reflectance = radiance/irradiance); however, it is not total irradiance unless it is made out of spectralon or…"
"Use GIS or RS software to draw a polygon/roi inside the panel (excluding the edges to avoid mixed pixels). For each band, average the pixel values inside the polygon. Next, for each band, divide that averaged value into the rest of the pixels."
"Yes, I am interested in cloud vs canopy self-shade. Within a given area, let's say 20 square feet, there will be less pixel-to-pixel variance in an area shaded by cloud (it will also be more diffuse) than an area imaged when the sun angle is low and…"
"Let's keep the discussion online.
Shadow: Are you referring to cloud shadow or the canopy self-shading? Also, a very very very smart engineer who knows a lot about multispectral cameras and UAVs made a comment to me once about how NDVI can be…"
Shadow: Are you referring to cloud shadow or the canopy self-shading? Also, a very very very smart engineer who knows a lot about multispectral cameras and UAVs made a comment to me once about how NDVI can be…"
"Theoretically, a blue band will not be as sensitive to variability in chlorophyll absorption as a red band because carotenoids and chlorophyll both absorb blue light whereas mostly just chlorophyll absorbs red light. Therefore, when chlorophyll…"
"There are several agricultural technology companies that offer products based on NDVI or a close relative. Farmers (corporate or mom & pop) do pay for value-added products based on vegetation indices as well as general crop health maps based on…"
"It does not make sense to include the green channel for false color composites. Therefore, just assign NIR to Red, Visible (red or blue) to Green, Visible (same as assigned to Green) to Blue. The result looks more like traditional false color…"
