Hi,
Here is a sample of "spatial queries" coming from PS-MOPS (PanSTARRS
Moving Object Pipeline System). One thing orth pointing out is that
in PS-MOPS no spatial queries are ever sent to a database. They are
evaluated by custom code external to the RDBMS.
Terminology:
- Detection: a point in the (RA, Dec, time) space.
- Field: the footprint of a single exposure (with the datetime of
observation associated to it).
- Orbit: the analytical description of the trajectory of an
astronomical body.
QUERIES - for any given point in time:
- Is this detection inside this field?
- Is this orbit inside this field?
- Are these orbits close to each other?
- Does this detection fall on this orbit?
- Which orbit does this detection fall on?
QUERIES - specifying a range in time (possibly infinite):
- Which fields do these detection fall onto?
- Which orbits do these detection fall onto?
- Which fields are intersected by each of these orbits?
- Which fields are at no more than X arcsec from each of these orbits?
Hope it helps
Francesco
_______________________________________________
LSST-data mailing list
[email protected]
http://www.lsstmail.org/mailman/listinfo/lsst-data
