Class SpatialIsValid

Namespace

YndigoBlue.Velocity.Functions

Assembly

YndigoBlue.Velocity.dll

Represents the ST_IsValid spatial validation function that tests whether a geometry is topologically valid.

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

Inheritance

object

Function

SpatialIsValid

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_IsValid function returns true if the geometry is well-formed according to the OGC Simple Features specification, and false otherwise. Valid geometries have no self-intersections, proper orientation, closed rings, and consistent topology. For Geometry types in planar coordinate systems, validation checks for common issues like polygon rings that cross themselves, unclosed rings, or invalid multi-part geometries. This function is essential for data quality assurance, validation before spatial operations, and ensuring compliance with standards. OGC-compliant.

Return Type: Boolean (true/false).

Geometry	ST_IsValid Result
Simple closed polygon	TRUE
Self-intersecting polygon (bowtie)	FALSE
Polygon with hole touching exterior	FALSE
Polygon with hole outside shell	FALSE
Point, LineString	TRUE (always valid)

Constructors

SpatialIsValid(Geometry)

Initializes a new instance of ST_IsValid with a geometry literal.

SpatialIsValid(Column)

Initializes a new instance of ST_IsValid with a geometry column.

SpatialIsValid(Function)

Initializes a new instance of ST_IsValid for a function result.

SpatialIsValid(Geography)

Initializes a new instance of ST_IsValid with a geography literal.