Add an event detector for passing through a complex geographic zone
For some low orbiting spacecraft, there are need to identify when the
pass through complete geographic zones.
The zones may be as simple as a longitude interval and a latitude interval, but they may also be quite
complex, if for example countries landmasses are to be considered. In this case, the zones are not convex,
they may be split in several subzones (for islands), the may contain holes (for inner waters when they
are not considered), they may contain the poles (which means longitude boundaries are not meaningful there).
A typical general interest zone is for example the South Atlantic Anomaly.
A dedicated event detector could identify the entry and exit events
related to such zones. The detector
should also allow setting up an angular margin around the raw definition for the zone, allowing for example to
define a zone using coastline and to apply a 200/60 degree margin to it so the detection is triggered at the
limit of the 200 nm exclusive economic zone around an island.
(from redmine: issue id 163, created on 2014-02-12, closed on 2015-01-12)