The names below mix "satellite" and "instrument" differently than I'm
used to. For AIRS we use satellite zenith & azimuth angles, since
it is the angle to the entire satellite, not just a single instrument.
We also have an instrument scan angle, along its own scan plan and
relative to its nominal "nadir" position, not to true nadir. We
sometimes calculate a satellite view angle from instrument
zenith angle. This is roughly equivalent to a scan angle but
explicitly divorced from actual instrument geometry and satellite
attitude.
I recommend changing:
instrument_zenith_angle -> satellite_zenith_angle
instrument_azimuth_angle -> satellite_azimuth_angle
satellite_scan_angle -> satellite_view_angle
And add:
instrument_scan_angle
The angle between the line of sight from an instrument and its
reference scan position.
-- Evan
> 3) "instrument_zenith_angle" [degree]
> The angle between the line of sight to the instrument and the local
> vertical.
> 4) "satellite_scan_angle" [degree]
> The angle between the line of sight from the satellite and the nadir
> line. Nadir is the direction given by the vertical from the satellite
> looking towards the center of the Earth.
> 5) "instrument_azimuth_angle" [degree]
> The horizontal angle between the line of sight to the instrument and
> a reference direction which is often due north. The angle is measured
> clockwise.
> 6) "relative_instrument_azimuth_angle" [degree]
> Difference between two instrument_azimuth_angle values.
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