Predefined spatial reference systems

The spatial reference system combines factors to convert the coordinate data to positive integers with the coordinate system definition.

The database provides the predefined spatial reference systems that are shown in Table 1, along with the coordinate system on which each spatial reference system is based and the offset values and scale factors that are used to convert the coordinate data to positive integers. You can find information about these spatial reference systems in the spatial reference systems catalog view.

If you are working with decimal-degrees, the offset values and scale factors for the default spatial reference systems support the full range of latitude-longitude coordinates and preserve 6 decimal positions, equivalent to approximately 10 cm.

If none of the default spatial reference systems meet your needs, you can create a new spatial reference system.

Table 1. List of predefined spatial reference systems
Spatial reference system	SRS ID	Coordinate system	Offset values	Scale factors	When to use
DEFAULT _SRS	0	None	xOffset = 0 yOffset = 0 zOffset = 0 mOffset = 0	xScale = 1 yScale = 1 zScale = 1 mScale = 1	You can select this system when your data is independent of a coordinate system or you cannot or do not need to specify one.
NAD83_ SRS_1	1	GCS_NORTH _AMERICAN _1983	xOffset = -180 yOffset = -90 zOffset = 0 mOffset = 0	xScale = 1,000,000 yScale = 1,000,000 zScale = 1 mScale = 1	You can select this spatial reference system if you want to use a larger scale than NAD83_SRS_4269. If the coordinate data that you are working with was collected after 1983, use this system instead of NAD27_SRS_1002.
NAD83_SRS_4269	4269	GCS_NORTH_AMERICAN_1983	xOffset = -180 yOffset = -90 zOffset = 0 mOffset = 0	xScale = 5,965,232 yScale = 5,965,232 zScale = 1 mScale = 1	If the coordinate data that you are working with was collected after 1983, use this system instead of NAD27_SRS_1002.
NAD27_ SRS_1002	1002	GCS_NORTH _AMERICAN _1927	xOffset = -180 yOffset = -90 zOffset = 0 mOffset = 0	xScale = 5,965,232 yScale = 5,965,232 zScale = 1 mScale = 1	If the coordinate data that you are working with was collected before 1983, use this system instead of NAD83_SRS_1. This system provides a greater degree of precision than most other default spatial reference systems.
WGS84_ SRS_1003	1003	GCS_WGS _1984	xOffset = -180 yOffset = -90 zOffset = 0 mOffset = 0	xScale = 5,965,232 yScale = 5,965,232 zScale = 1 mScale = 1	You can select this spatial reference system if you are working with worldwide data.
WGS84_ SRS_4326	4326	GCS_WGS _1984	xOffset = -180 yOffset = -90 zOffset = 0 mOffset = 0	xScale = 5,965,232 yScale = 5,965,232 zScale = 1 mScale = 1	You can select this spatial reference system if you are working with worldwide data
DE_HDN _SRS_1004	1004	GCSW _DEUTSCHE _HAUPTDRE IECKSNETZ	xOffset = -180 yOffset = -90 zOffset = 0 mOffset = 0	xScale = 5,965,232 yScale = 5,965,232 zScale = 1 mScale = 1	This spatial reference system is based on a coordinate system for German addresses.
BNG_SRS_27700	27700	BRITISH_NATIONAL_GRID	xOffset = -180 yOffset = -90 zOffset = 0 mOffset = 0	xScale = 5,965,232 yScale = 5,965,232 zScale = 1 mScale = 1	This spatial reference system is based on a coordinate system for Great Britain.