Searchable Sky Coverage of Astronomical Observations: Footprints and Exposures

Details Searchable Sky Coverage of Astronomical Observations: Footprints and Exposures Searchable Sky Coverage of Astronomical Observations: Footprints and Exposures

2010-05-14

arxiv.org/abs/1005.2606v1

Astronomy and Astrophysics

Astrophysics

Instrumentation and Methods for Astrophysics

11 pages, 7 figures, submitted to PASP

Scientific paper

Sky coverage is one of the most important pieces of information about astronomical observations. We discuss possible representations, and present algorithms to create and manipulate shapes consisting of generalized spherical polygons with arbitrary complexity and size on the celestial sphere. This shape specification integrates well with our Hierarchical Triangular Mesh indexing toolbox, whose performance and capabilities are enhanced by the advanced features presented here. Our portable implementation of the relevant spherical geometry routines comes with wrapper functions for database queries, which are currently being used within several scientific catalog archives including the Sloan Digital Sky Survey, the Galaxy Evolution Explorer and the Hubble Legacy Archive projects as well as the Footprint Service of the Virtual Observatory.

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