TABLE  Region

Definition of the different regions

We have various boundaries in the survey, represented by equations of 3D planes, intersecting the unit sphere, describing great and small circles, respectively. This table stores the description of a region, the details are in the HalfSpace table.
  • CHUNK - the boundary of a given Chunk
  • STRIPE - the boundary of the whole stripe
  • STAVE - the unique boundary of the whole stripe, agrees with STRIPE for Southern stripes
  • PRIMARY - the primary region of a given CHUNK
  • SEGMENT - the idealized boundary of a segment
  • CAMCOL - the real boundary of a segment
  • PLATE - the boundary of a plate
  • TILE - the boundary of a circular tile
  • TIGEOM - the boundary of a Tiling Run, also includes inverse regions, which must be excluded
  • RUN - the union of the CAMCOLs making up a Run
  • WEDGE -- intersection of tiles as booleans.
  • TILEBOX -- intersection of TIGEOM respecting masks (these are positive convex TIGEOM)
  • SKYBOX -- intersection and union of TILEBOX to cover the sky with positive disjoin convex regions.
  • SECTORLETS -- intersection of Skyboxes with wedges. These are the areas that have targets.
  • SECTORS -- collects together all the sectorlets with the same covering (and excluded) tiles.
    See also the RegionConvex and Halfspace tables

idbigint8  key of the region pointing into other tables
typevarchar16  type of the region (STRIPE|STAVE|...)
commentvarchar1024  description of the region
ismasktinyint1  0: region, 1: to be excluded
areafloat8deg^2EXTENSION_AREAarea of region
regionStringvarchar-1  the string representation of the region
regionBinaryvarbinary-1  the precompiled XML description of region