SeaWiFS azimuth angles in Level2
Posted: Fri Jun 01, 2018 8:27 am America/New_York
There seems to be a formatting issue for azimuth angles in Level2 SeaWiFS (when including sola and sena in output).
SeaWiFS azimuth angles are defined in [0, 360], but netCDF attributes actually define :
...which corresponds to a valid range of [-180, 180].
Thus when reading these angles with typical netCDF readers, the values greater than 180 are masked.
A workaround can be to apply
This does not apply to MODIS and VIIRS because their azimuth angles are defined in [-180, 180].
Note: this is with l2gen 8.10.3-r0
SeaWiFS azimuth angles are defined in [0, 360], but netCDF attributes actually define :
<class 'netCDF4._netCDF4.Variable'>
int16 sola(number_of_lines, pixels_per_line)
long_name: Solar Azimuth Angle
scale_factor: 0.0111111
add_offset: 0.0
units: degree
standard_name: solar_azimuth_angle
_FillValue: -32767
valid_min: -16200
valid_max: 16200
path = /geophysical_data
unlimited dimensions:
current shape = (3930, 248)
filling on...which corresponds to a valid range of [-180, 180].
Thus when reading these angles with typical netCDF readers, the values greater than 180 are masked.
A workaround can be to apply
set_auto_mask(False) to those datasets. But fixing this formatting would certainly be welcome.This does not apply to MODIS and VIIRS because their azimuth angles are defined in [-180, 180].
Note: this is with l2gen 8.10.3-r0