Class Coverage

Description:

Functions related to coverage and footprints.

One coverage standard is Multi-Order Coverage maps, described at http://www.ivoa.net/Documents/MOC/. MOC positions are always defined in ICRS equatorial coordinates.

MOCs may be specified using a string argument of the functions in one of the following ways:

• The filename of a MOC FITS file
• The URL of a MOC FITS file
• The identifier of a VizieR table, for instance "V/139/sdss9" (SDSS DR9)
• An ASCII MOC string, for instance "1/1 2 4 2/12-14 21 23 25 8/"

A list of all the MOCs available from VizieR can currently be found at https://alasky.cds.unistra.fr/footprints/tables/vizier/. You can search for VizieR table identifiers from the VizieR web page (https://vizier.cds.unistra.fr/); note you must use the table identifier (like "V/139/sdss9") and not the catalogue identifier (like "V/139").