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Spatial reference system
A
spatial reference system
(
SRS
) or
coordinate reference system
(
CRS
) is a
coordinate-based
local, regional or global system used to locate geographical entities. A spatial reference system defines a specific
map projection
, as well as transformations between different spatial reference systems. Spatial reference systems are defined by the
OGC
's
Simple feature access
using
well-known text
, and support has been implemented by several
standards-based
geographic information systems
. Spatial reference systems can be referred to using a
SRID
integer
, including EPSG codes defined by the
International Association of Oil and Gas Producers
.
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