| title | M (geography Data Type) | ||
|---|---|---|---|
| description | M (geography Data Type) | ||
| author | MladjoA | ||
| ms.author | mlandzic | ||
| ms.date | 03/14/2017 | ||
| ms.service | sql | ||
| ms.subservice | t-sql | ||
| ms.topic | reference | ||
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| monikerRange | =azuresqldb-current || >=sql-server-2016 || >=sql-server-linux-2017 || =azuresqldb-mi-current || =fabric-sqldb |
[!INCLUDE SQL Server Azure SQL Database Azure SQL Managed Instance FabricSQLDB]
The M (measure) value of the geography instance. The semantics of the measure value are user-defined but generally describe the distance along a linestring. For example, the measure value could be used to keep track of mileposts along a road.
.M
[!INCLUDEssNoVersion] type: float
CLR type: SqlDouble
The value of this property is null if the geography instance is not a Point, as well as for any Point instance for which it is not set.
This property is read-only.
M values are not used in any calculations made by the library and will not be carried through any library calculations.
The following example creates a Point instance with Z (elevation) and M (measure) values and uses M to fetch the M value of the instance.
DECLARE @g geography;
SET @g = geography::STGeomFromText('POINT(-122.34900 47.65100 10.3 12)', 4326);
SELECT @g.M;
Extended Methods on Geography Instances
Z (geography Data Type)