| 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. |
| Name | Type | Length | Unit | Description | Default Value | Unified Content Descriptor |
|---|---|---|---|---|---|---|
| systemID | tinyint | 1 | Unique identifier of the system of survey field centres | ID_MAIN | ||
| fieldID | int | 4 | Unique identifier of survey field (fieldNum and systemID combo) | ID_FIELD | ||
| fieldNum | smallint | 2 | ESO/SRC or Palomar survey system field number | ID_FIELD | ||
| nominalRA | float | 8 | degrees | Nominal field centre RA | POS_EQ_RA_MAIN | |
| nominalDec | float | 8 | degrees | Nominal field centre Dec | POS_EQ_DEC_MAIN | |
| htmId | bigint | 8 | Hierarchical Triangular Mesh (20-deep) of nominal field centre | POS_GENERAL | ||
| cx | float | 8 | Cartesian x of unit (ra,dec) vector on celestial sphere | POS_EQ_X | ||
| cy | float | 8 | Cartesian y of unit (ra,dec) vector on celestial sphere | POS_EQ_Y | ||
| cz | float | 8 | Cartesian z of unit (ra,dec) vector on celestial sphere | POS_EQ_Z | ||
| Total length | 55 |