Class SpatialSrid

Namespace

YndigoBlue.Velocity.Functions

Assembly

YndigoBlue.Velocity.dll

Represents the ST_SRID spatial property function that returns the Spatial Reference System Identifier of a geometry.

public class SpatialSrid : Function, IElement, ICheckItem, IDefaultItem, IFilterItem

Inheritance

object

Function

SpatialSrid

Implements

IElement

ICheckItem

IDefaultItem

IFilterItem

Remarks

Warning

Spatial functions are not available in the Community Edition of Velocity. They require the Full Edition.

The ST_SRID function returns the integer SRID (Spatial Reference System Identifier) associated with a geometry or geography. The SRID identifies the coordinate system, such as WGS84 (SRID 4326) or various projected coordinate systems. Matching SRIDs is typically required for spatial operations between geometries. For Geometry types in planar coordinate systems and Geography types on spherical surfaces, this is essential for coordinate system management, transformation validation, or ensuring spatial operations use compatible reference systems. OGC-compliant.

Return Type: Integer (SRID value).

Common SRID	Description
4326	WGS 84 - GPS coordinates, lat/lon in degrees
3857	Web Mercator - Google Maps, OpenStreetMap
0	Unknown or no coordinate reference system

Constructors

SpatialSrid(Geometry)

Initializes a new instance of ST_SRID with a geometry literal.

SpatialSrid(Column)

Initializes a new instance of ST_SRID with a geometry column.

SpatialSrid(Function)

Initializes a new instance of ST_SRID for a function result.

SpatialSrid(Geography)

Initializes a new instance of ST_SRID with a geography literal.