Returns the number of curves in a one-dimensional geography instance.
.STNumCurves()
SQL Server return type: geography
CLR return type: SqlGeography
One-dimensional spatial data types include LineString, CircularString, and CompoundCurve. An empty one-dimensional geography instance returns 0.
STNumCurves
() works only on simple types; it does not work with geography collections like MultiLineString. NULL is returned when the geography instance is not a one-dimensional data type.
Null is returned for uninitialized geography instances.
The following example shows how to get the number of curves in a CircularString
instance:
DECLARE @g geography;
SET @g = geography::Parse('CIRCULARSTRING(-122.358 47.653, -122.348 47.649, -122.348 47.658, -122.358 47.658, -122.358 47.653)');
SELECT @g.STNumCurves();
The following example uses STNumCurves()
to return the number of curves in a CompoundCurve
instance.
DECLARE @g geography;
SET @g = geography::Parse('COMPOUNDCURVE(CIRCULARSTRING(-122.358 47.653, -122.348 47.649, -122.348 47.658, -122.358 47.658, -122.358 47.653))');
SELECT @g.STNumCurves();
Spatial Data Types Overview
OGC Methods on Geography Instances