# Point

**SQL Server 2012**

In SQL Server spatial data, a Point is a 0-dimensional object representing a single location and may contain Z (elevation) and M (measure) values.

The Point type for the geography data type represents a single location where *Lat* represents latitude and *Long* represents longitude. The values for latitude and longitude are measured in degrees. Values for latitude always lie in the interval [-90, 90], and values that are inputted outside this range will throw an exception. Values for longitude always lie in the interval (-180, 180], and values inputted outside this range are wrapped around to fit in this range. For example, if 190 is inputted for longitude, then it will be wrapped to the value -170. *SRID* represents the spatial reference ID of the **geography** instance that you wish to return.

The following example creates a geometry Point instance representing the point (3, 4) with an SRID of 0.

DECLARE @g geometry; SET @g = geometry::STGeomFromText('POINT (3 4)', 0);

The next example creates a geometry Point instance representing the point (3, 4) with a Z (elevation) value of 7, an M (measure) value of 2.5, and the default SRID of 0.

DECLARE @g geometry; SET @g = geometry::Parse('POINT(3 4 7 2.5)');

The final example returns the X, Y, Z, and M values for the geometry Point instance.

SELECT @g.STX; SELECT @g.STY; SELECT @g.Z; SELECT @g.M;

Z and M values may be explicitly specified as NULL, as shown in the following example.

DECLARE @g geometry; SET @g = geometry::Parse('POINT(3 4 NULL NULL)');