Class SpatialIsEmpty

Namespace

YndigoBlue.Velocity.Functions

Assembly

YndigoBlue.Velocity.dll

Represents the ST_IsEmpty spatial validation function that tests whether a geometry is empty.

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

Inheritance

object

Function

SpatialIsEmpty

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_IsEmpty function returns true if the geometry represents an empty set with no points, lines, or polygons. Empty geometries are valid but contain no spatial information. They can result from spatial operations that produce no geometric output, such as the intersection of disjoint geometries. For both Geometry types (planar coordinate systems) and Geography types (spherical surfaces), this is useful for validating operation results, filtering null geometries, or data quality checks. OGC-compliant.

Return Type: Boolean (true/false).

Geometry	ST_IsEmpty Result
POINT(1 2)	FALSE
POINT EMPTY	TRUE
LINESTRING(0 0, 1 1)	FALSE
LINESTRING EMPTY	TRUE
Result of ST_Intersection on disjoint geometries	TRUE

Constructors

SpatialIsEmpty(Geometry)

Initializes a new instance of ST_IsEmpty with a geometry literal.

SpatialIsEmpty(Column)

Initializes a new instance of ST_IsEmpty with a geometry column.

SpatialIsEmpty(Geography)

Initializes a new instance of ST_IsEmpty with a geography literal.