The STLineToCurve function analyses a LineString looking for CircularString elements among its vertices (often LineStrings are created from curve elements by “stroking” especially where the processing software does not support CircularStrings). Any constructed CircularStrings are combined with other LineStrings to create CompoundCurves or CurvePolygons.
STMulti — Function that returns @p_geometry as a MULTI* geometry Function Specification Description In situations where a geometry column is constrained to hold only the multi version of a base geometry, storage of a single geometry eg LineString requires that geometry to be wrapped as a multi geometry eg MultiLineString. ALTER TABLE [dbo].[Colony] WITH CHECKRead More
This function uses the SQL Server Spatial ShortestLineTo function to compute a point on the boundary of the supplied geometry nearest to the supplied point. If the snap distance is < the user supplied @p_snap_within distance, the computed point is returned. However, if the distance is > the user supplied @p_snap_within distance the original point is returned.