STAsText (geography Data Type)
Applies To: SQL Server 2014, SQL Server 2016 Preview
Returns the Open Geospatial Consortium (OGC) Well-Known Text (WKT) representation of a geography instance. This text will not contain any Z (elevation) or M (measure) values carried by the instance.
This geography data type method supports FullGlobe instances or spatial instances that are larger than a hemisphere.
Applies to: SQL Server (SQL Server 2008 through current version), Azure SQL Database.
SQL Server return type: nvarchar(max)
CLR return type: SqlChars
The OGC type of a geography instance can be determined by invoking STGeometryType().
In SQL Server 2012, the set of possible results returned on the server has been extended to FullGlobe instances.
The following example uses STAsText() to create a LineString geography instance from (-122.360, 47.656) to (-122.343, 47.656) from text. It then returns the result in text.
DECLARE @g geography; SET @g = geography::STGeomFromText('LINESTRING(-122.360 47.656, -122.343 47.656)', 4326); SELECT @g.STAsText();