Why are laser footprint shape parameters not available for low energy campaigns?
Several parameters help quantify the shape of the GLAS laser footprint, which changes slightly for each campaign. These parameters are:
GLAS Binary Products
|i_tpintensity_avg||Transmit pulse intensity - frame average|
|i_tpazimuth_avg||Transmit pulse azimuth - frame average|
|i_tpeccentricity_avg||Transmit pulse eccentricity - frame average|
|i_tpmajoraxis_avg||Transmit pulse major axis - frame average|
GLAS HDF5 Products
|d_tpintensity_avg||Transmit pulse intensity - frame average|
|d_tpazimuth_avg||Transmit pulse azimuth - frame average|
|d_tpeccentricity_avg||Transmit pulse eccentricity - frame average|
|d_tpmajoraxis_avg||Transmit pulse major axis - frame average|
These parameters are fine on most campaigns, but in the later campaigns (after Laser 2D), the laser energy was too weak to be able to compute the pulse shape, so these parameters show values of 0.