Class SpatialTouches
- Namespace
- YndigoBlue.Velocity.Functions
- Assembly
- YndigoBlue.Velocity.dll
Represents the ST_Touches spatial predicate function that tests if two geometries touch at their boundaries but not interiors.
public class SpatialTouches : Function, IElement, ICheckItem, IDefaultItem, IFilterItem- Inheritance
-
SpatialTouches
- Implements
Remarks
Warning
Spatial functions are not available in the Community Edition of Velocity. They require the Full Edition.
The ST_Touches function returns true if the two spatial objects have at least one boundary point in common, but no interior points in common. According to the DE-9IM model, this means the intersection of their interiors is empty, but the intersection of the boundary of one with the other is not empty. Useful for finding adjacent features like neighboring parcels or connected road segments. OGC-compliant.
Return Type: Boolean (true/false).
| Relationship | ST_Touches Result |
|---|---|
| Edge touch (shared boundary line) | TRUE |
| Corner touch (single point) | TRUE |
| Line endpoint touches polygon edge | TRUE |
| Overlapping (shared interior) | FALSE |
| Disjoint (no contact) | FALSE |
Constructors
- SpatialTouches(Geometry, Column)
Initializes a new instance of ST_Touches with a geometry literal and column.
- SpatialTouches(Geometry, Function)
Initializes a new instance of ST_Touches with a Geometry literal and function result for function chaining.
- SpatialTouches(Column, Geometry)
Initializes a new instance of ST_Touches with a column and geometry literal.
- SpatialTouches(Column, Column)
Initializes a new instance of ST_Touches with two columns for spatial joins.
- SpatialTouches(Column, Function)
Initializes a new instance of ST_Touches with a column and function result for function chaining.
- SpatialTouches(Column, Geography)
Initializes a new instance of ST_Touches with a column and geography literal.
- SpatialTouches(Function, Geometry)
Initializes a new instance of ST_Touches with a function result and Geometry literal for function chaining.
- SpatialTouches(Function, Column)
Initializes a new instance of ST_Touches with a function result and column for function chaining.
- SpatialTouches(Function, Function)
Initializes a new instance of ST_Touches with two function results for function chaining.
- SpatialTouches(Function, Geography)
Initializes a new instance of ST_Touches with a function result and Geography literal for function chaining.
- SpatialTouches(Geography, Column)
Initializes a new instance of ST_Touches with a geography literal and column.
- SpatialTouches(Geography, Function)
Initializes a new instance of ST_Touches with a Geography literal and function result for function chaining.