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Workspace Method rte_pos_losBackwardToAltitude
Moves rte_pos and rte_los backwards to the target altitude.
The method gives the rte_pos and rte_los at the target altitude
to reach the original rte_pos and rte_los with a geometrical ppath.
That is, the movement is backwards in terms of viewing direction.
If the original rte_los is reversed with respect to the line-of-sight
direction, then set the GIN los_reversed to 1. One such case is that
if rte_los represents surface incidence angles, i.e. holds the
zenith and nadir angle towards the sensor.
There is also sensor_pos_losBackwardToAltitude.
Authors: Patrick Eriksson