Class SpatialPointN
- Namespace
- YndigoBlue.Velocity.Functions
- Assembly
- YndigoBlue.Velocity.dll
Represents the ST_PointN spatial accessor function that returns the Nth point in a linestring geometry.
public class SpatialPointN : Function, IElement, ICheckItem, IDefaultItem, IFilterItem- Inheritance
-
SpatialPointN
- Implements
Remarks
The ST_PointN function returns a point geometry representing the Nth vertex (1-based index) of a linestring. The first point is at index 1, not 0. For multi-linestrings or non-linestring geometries, behavior varies by database implementation. Negative indices may access points from the end in some implementations. For Geometry types in planar coordinate systems, this is useful for extracting specific vertices, analyzing linestring structure, or sampling points along a line. OGC-compliant.
Constructors
- SpatialPointN(Column, int)
Initializes a new instance of ST_PointN with a linestring geometry column and point index.