Preliminary Results Created by Dr. Petya Campbell, STELLA Lead Scientist
In the field study points on the grass were marked where measurements from the ASD and STELLA were to be acquired.
Calibration Panels Measurements
The STELLA panel represents well the 475-2500 nm region, and does not represent well the 350-475 nm region
STELLA sensor response functions (RSR)
STELLA sensor response functions (RSR) used to convolve the ASD measurements to the STELLA sensor bands.
Comparing Large Calibration Panel Measurements using ASD, STELLA 207 and 655
- The STELLA panel and the ASD panel provide strongly and linearly correlated data.
- The STELLA panel underestimates the values obtained with the Large panel.
- STELLA 207 and 655 provide comparable measurements of the Panels
- The ASD and STELLA panel measurements are strongly correlated, however the outputs are significantly different
Large Calibration Panel Radiance comparing STELLA 207 and 655 vs. ASD
- STELLA’s VIS and NIR radiance relationships to ASD differ
- The NIR STELLA and ASD bands are better related in radiance space as compared to the VIS
- In the VIS the relation of the two STELLA instruments to the ASD radiance slightly differs, while in the NIR does not
Grass Measurements using STELLA 207 and 655
STELLA 207
STELLA 655
Comparing Grass Measurements using STELLA 207 and 655 (all data)
STELLA 207 and 655 provide comparable measurements of the grass targets. The variations are likely due to the differences in the field of view of the instruments and the natural variation in the grass.
Comparing Grass Measurements using STELLA 207 and 655 (means and StDev)
STELLA 207 and 655 provide comparable reflectance and thermal measurements.
Grass ASD reflectance measurements
Grass ASD reflectance measurements convolved to STELLA bands
Comparing grass reflectance (band means and StDev ) collected with STELLA 207 (black) and 655 (red) to ASD reflectance for the same bands
Vegetation Indices NDVI and NIRv for Grass comparing STELLA 207 and 655 vs. ASD ( means and StDev)
SCOPE Simulation of Crop Canopy Reflectance
| Nitrogen (N) | 0 | 50 | 100 | 150 |
| Cab |
24.07 | 47.68 | 44.74 | 52.54 |
| Vcmo | 23.15 | 23.15 | 23.15 | 23.15 |
| LAI | 3.207 | 3.977 | 3.993 | 4.167 |
Crop Canopy Reflectance Convolved to STELLA
