[Spice_discussion] Adding Surface Coverage Information to SPICE???
Charles H. Acton
cacton at mailhost4.jpl.nasa.gov
Tue Mar 15 14:06:49 PST 2005
During a recent trip to Noordwijk for a Mars Express Science
Conference I jotted down some notes about adding surface coverage
information to SPICE. Here, for your consideration/comment, are
those ideas and questions.
Surface Coverage Information in SPICE
How might surface coverage information be integrated into SPICE...
particularly the plate model and digital terrain model?
* For just one instrument:
- it might be a simple yes or no flag
- but more likely useful to scientists is a coverage query based on
a set of observation geometry conditions (maybe even including
user-supplied non-geometry conditions), such as:
+ altitude (within a range)
+ season (within a range)
+ lighting angles (within a range)
+ ground-track surface velocity (within a range)
+ instrument operating mode
* Consider how to handle the above...
- for multiple instruments on a given spacecraft
- for multiple spacecraft
* Consider ways to represent a range of (different numbers of) hits
within any one of the condition sets shown above. (How deal with
=> varying a color as a function of # of hits seems one choice
* Consider making coverage "decisions" (i.e. covered or not covered)
- some sort of LAT/LON grid
- a landmarks database
- a geological units database
- multiple of the above
(* Speaking of which, should NAIF consider implementing, or somehow
linking to, a "geological units" database/kernel?)
*Finally, what questions along these lines did I not think of asking?
And particularly, what might the user interface(s)--the API(s)--for
this functionality look like?
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