TABLE  Field

Survey field information for the SSA.

The whole-sky Schmidt photographic surveys were implemented using a system
of field centres defined over the surveyed areas. This table contains the
survey (SSA) and field number (eg. ESO/SRC, POSS-I) designations along
with the nominal field centre, size and spatial indexing attributes.

NameTypeLengthUnitDescriptionDefault ValueUnified Content Descriptor
systemIDtinyint1 Unique identifier of the system of survey field centres ID_MAIN
fieldIDint4 Unique identifier of survey field (fieldNum and systemID combo) ID_FIELD
fieldNumsmallint2 ESO/SRC or Palomar survey system field number ID_FIELD
nominalRAfloat8degreesNominal field centre RA POS_EQ_RA_MAIN
nominalDecfloat8degreesNominal field centre Dec POS_EQ_DEC_MAIN
htmIdbigint8 Hierarchical Triangular Mesh (20-deep) of nominal field centre POS_GENERAL
cxfloat8 Cartesian x of unit (ra,dec) vector on celestial sphere POS_EQ_X
cyfloat8 Cartesian y of unit (ra,dec) vector on celestial sphere POS_EQ_Y
czfloat8 Cartesian z of unit (ra,dec) vector on celestial sphere POS_EQ_Z
Total length55