Topic Status: Some information in this topic is preview and subject to change in future releases. Preview information describes new features or changes to existing features in Microsoft SQL Server 2016 Community Technology Preview 2 (CTP2).
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)');