This implementation extends the ARQ query processor of Apache Jena GeoSPARQL with further functions to support geometry operations. This implementation builds upon and extends work by Greg Albiston:
https://github.com/galbiston/geosparql-jena
Please also visit the sister projects of this implementation with aim for similar implementations for RDF4J and Apache Marmotta:
Testbench:
https://www.i3mainz.de/projekte/semgis/postgis-jena/
The main contribution of this implementation is the provision of further geospatial processing functions which are available in comparable relational database implementations such as POSTGIS or Oracle Spatial but not yet in a Semantic Web implementation. Particular focus is given to highlight the compatibility of given functions with raster/coverage data representations. The status of the implementation is highlighted in the respective columns of the tables. Eventual goal is the implementation of most coverage/raster specific functions used in comparable non-semantic implementations which may or may not become part of a new standardization process involving GeoSPARQL. The implementation can be tested using the provided JUnit tests. A deployment of the service is currently not available.
Spatial aggregate functions define aggregate functions which can be applied to geometry and coverage literals.
| Function | Return Value | Description | Type | In GeoSPARQL? | Supports raster? | Stable? |
|---|---|---|---|---|---|---|
| geo2:ST_AVGX | xsd:double | Calculates the aggregate of all given X coordinate values | Aggregate | No | Todo | Yes |
| geo2:ST_AVGXDistinct | xsd:double | Calculates the aggregate of all given distinct X coordinate values | Aggregate | No | Todo | Yes |
| geo2:ST_AVGY | xsd:double | Calculates the aggregate of all given Y coordinate values | Aggregate | No | Todo | Yes |
| geo2:ST_AVGYDistinct | xsd:double | Calculates the aggregate of all given Y coordinate values | Aggregate | No | Todo | Yes |
| geo2:ST_AVGZDistinct | xsd:double | Calculates the aggregate of all given Z coordinate values | Aggregate | No | Todo | Yes |
| geo2:ST_BoundingBox | sf:Geometry | Calculates an aggergate boundingbox of all given geometries | Aggregate | No | Todo | Yes |
| geo2:ST_BoundingBoxDistinct | sf:Geometry | Calculates an aggregate boundingbox of all given distinct geometries | Aggregate | No | Todo | No |
| geo2:ST_MaxX | xsd:double | Calculates the maximum X coordinate of all given geometries | Aggregate | No | Todo | Yes |
| geo2:ST_MaxY | xsd:double | Calculates the maximum Y coordinate of all given geometries | Aggregate | No | Todo | Yes |
| geo2:ST_MaxZ | xsd:double | Calculates the maximum Z coordinate of all given geometries | Aggregate | No | Todo | Yes |
| geo2:ST_MinX | xsd:double | Calculates the minimum X coordinate of all given geometries | Aggregate | No | Todo | Yes |
| geo2:ST_MinXDistinct | xsd:double | Calculates the minimum X coordinate of all distinct given geometries | Aggregate | No | Todo | Yes |
| geo2:ST_MinY | xsd:double | Calculates the minimum Y coordinate of all given geometries | Aggregate | No | Todo | No |
| geo2:ST_MinYDistinct | xsd:double | Calculates the minimum Y coordinate of all distinct given geometries | Aggregate | No | Todo | Yes |
| geo2:ST_MinZ | xsd:double | Calculates the minimum Z coordinate of all given geometries | Aggregate | No | Todo | No |
| geo2:ST_MinZDistinct | xsd:double | Calculates the minimum Z coordinate of all distinct given geometries | Aggregate | No | Todo | Yes |
This section defines additional functions for vector geometries which are supported by the implementation. If functions from GeoSPARQL are reimplemented they are marked as such. If functions may also relate vector geometries to raster data, they are marked as such. Functions which are not fully implemented or unstable are marked in the table.
This implementation supports the following geometry literal types:
- Encoded Polyline
- GeoURI Literals
- GeoJSON Literals
- Geography Markup Language (GML) Literals (as defined in GeoSPARQL)
- GPS Exchange Format (GPX) Literals
- Hexadecimal WKB Literals (HexWKB)
- Keyhole Markup Language (KML) Literals
- Tiny Well-Known-Binary (TWKB) Literals
- Well-Known-Binary (WKB) Literals
- Well-Known-Text (WKT) Literals (as defined in GeoSPARQL)
Planned further implementations:
These functions return attributes of a given vector or raster literal which may be used e.g. in SPARQL FILTER expressions.
| Function | Return Value | Description | Type | In GeoSPARQL? | Supports raster? | Stable? |
|---|---|---|---|---|---|---|
| geo2:ST_Area (sf:Geometry geom) | xsd:double | Calculates the area of the geometry | Attribute | No | Yes | Yes |
| geo2:ST_Area3D (sf:Geometry geom) | xsd:double | Calculates the area of a 3d geometry | Attribute | No | Todo | No |
| geo2:ST_Boundary (sf:Geometry geom) | sf:LineString | Calculates the boundary of a geometry | Attribute | Yes | Yes | Yes |
| geo2:ST_BoundingDiagonal (sf:Geometry geom) | sf:LineString | Calculates the bounding diagonal of a geometry | Attribute | No | Todo | Yes |
| geo2:ST_Centroid (sf:Geometry geom) | sf:Point | Calculates the centroid of a geometry | Attribute | No | Todo | Yes |
| geo2:ST_CompactnessRatio (sf:Geometry geom) | xsd:double | Calculates the compactness ratio of a geometry | Attribute | No | N/A | Yes |
| geo2:ST_ConcaveHull (sf:Geometry geom) | sf:Geometry | Calculates the concave hull of a geometry | Attribute | No | Todo | Yes |
| geo2:ST_ConvexHull (sf:Geometry geom) | sf:Geometry | Calculates the convex hull of a geometry | Attribute | No | Todo | Yes |
| geo2:ST_Dimension (sf:Geometry geom) | xsd:double | Calculates the dimension of the given geometry | Attribute | No | Todo | Yes |
| geo2:ST_GeometryN (sf:Geometry geom) | sf:Geometry | Returns the nth geometry of a Geometry Collection | Attribute | No | N/A | Yes |
| geo2:ST_GeometryType (sf:Geometry geom) | xsd:string | Returns the type of a the given Geometry | Attribute | No | Todo | Yes |
| geo2:ST_HasHorizontalCRS (sf:Geometry geom) | xsd:boolean | Indicates whether the CRS of the given geometry is horizontal | Attribute | No | Todo | Yes |
| geo2:ST_HasRepeatedPoints (sf:Geometry geom) | xsd:boolean | Indicates whether geometry has repeated coordinates | Attribute | No | No | Yes |
| geo2:ST_InteriorPoint (sf:Geometry geom) | sf:Point | Returns a point guaranteed to be covered by the geometry | Attribute | No | Todo | Yes |
| geo2:ST_Is3D (sf:Geometry geom) | xsd:boolean | Indicates whether the given geometry is a 3D geometry | Attribute | No | Todo | Yes |
| geo2:ST_IsCollection (sf:Geometry geom) | xsd:boolean | Indicates whether the given geometry is a GeometryCollection | Attribute | No | N/A | Yes |
| geo2:ST_IsInCRSAreaOfValidity (sf:Geometry geom) | xsd:boolean | Indicates whether the point is in a valid area defined by its CRS | Attribute | No | N/A | Yes |
| geo2:ST_IsMeasured (sf:Geometry geom) | xsd:boolean | Indicates whether the geometry contains a measurement coordinate | Attribute | No | N/A | Yes |
| geo2:ST_IsPlanar (sf:Geometry geom) | xsd:boolean | Indicates whether the geometry is 2D | Attribute | No | N/A | Yes |
| geo2:ST_IsRectangle (sf:Geometry geom) | xsd:boolean | Indicates whether the geometry is a rectangle | Attribute | No | N/A | Yes |
| geo2:ST_IsSolid (sf:Geometry geom) | xsd:boolean | Indicates whether the geometry is 3D (see also geo2:ST_Is3D) | Attribute | No | N/A | Yes |
| geo2:ST_IsSquare (sf:Geometry geom) | xsd:boolean | Indicates whether the geometry is a square | Attribute | No | N/A | Yes |
| geo2:ST_IsValidDetail (sf:Geometry geom) | xsd:string | Indicates whether the geometry is valid and the invlid part of the geometry as a String on error | Attribute | No | N/A | Yes |
| geo2:ST_IsValidReason (sf:Geometry geom) | xsd:string | Indicates whether the geometry is valid, returns a reason for this assessment | Attribute | No | N/A | Yes |
| geo2:ST_Length (sf:Geometry geom) | xsd:double | Indicates whether the length of the geometry | Attribute | No | Todo | Yes |
| geo2:ST_Length3D (sf:Geometry geom) | xsd:double | Indicates whether the 3d length of the geometry | Attribute | No | Todo | Yes |
| geo2:ST_MinimumBoundingCircle (sf:Geometry geom) | sf:Geometry | Returns the miminum bounding circle of the given geometry | Attribute | No | Todo | Yes |
| geo2:ST_MinimumBoundingCircleCenter (sf:Geometry geom) | sf:Point | Returns the center point of the miminum bounding circle of the given geometry | Attribute | No | Todo | Yes |
| geo2:ST_MinimumBoundingCircleRadius (sf:Geometry geom) | xsd:double | Returns the radius of the miminum bounding circle of the given geometry | Attribute | No | Todo | Yes |
| geo2:ST_MinimumClearance (sf:Geometry geom) | xsd:double | Returns the miminum clearance of the given geometry | Attribute | No | Todo | Yes |
| geo2:ST_MinimumClearanceLine (sf:Geometry geom) | sf:LineString | Returns the miminum clearance line of the given geometry | Attribute | No | Todo | Yes |
| geo2:ST_MinimumDiameter (sf:Geometry geom) | xsd:double | Returns the miminum diameter of the given geometry | Attribute | No | Todo | Yes |
| geo2:ST_MinimumDiameterLine (sf:Geometry geom) | sf:LineString | Returns the miminum diameter line of the given geometry | Attribute | No | Todo | Yes |
| geo2:ST_MinimumRectangle (sf:Geometry geom) | sf:Geometry | Returns the miminum rectangle around the given geometry | Attribute | No | Todo | Yes |
| geo2:ST_NDims (sf:Geometry geom) | xsd:integer | Returns the number of dimensions for a given geometry | Attribute | No | N/A | Yes |
| geo2:ST_NumDistinctGeometries (sf:Geometry geom) | xsd:integer | Returns the number of distinct geometries of the given geometry literal | Attribute | No | N/A | Yes |
| geo2:ST_NumDistinctPoints (sf:Geometry geom) | xsd:integer | Returns the number of distinct points of the given geometry literal | Attribute | No | N/A | Yes |
| geo2:ST_NumGeometries (sf:Geometry geom) | xsd:integer | Returns the number of geometries of the given geometry literal | Attribute | No | N/A | Yes |
| geo2:ST_NumPatches (sf:Geometry geom) | xsd:integer | Returns the number of patches of the given geometry literal | Attribute | No | N/A | No |
| geo2:ST_NumPoints (sf:Geometry geom) | xsd:integer | Returns the number of points of the given geometry literal | Attribute | No | N/A | Yes |
| geo2:ST_PatchN (sf:Geometry geom) | xsd:integer | Returns the nth patch of the given geometry literal | Attribute | No | N/A | No |
| geo2:ST_Perimeter (sf:Geometry geom) | xsd:integer | Returns the perimeter of the given geometry literal | Attribute | No | Todo | Yes |
| geo2:ST_Perimeter3D (sf:Geometry geom) | xsd:integer | Returns the 3d perimeter of the given geometry literal | Attribute | No | Todo | No |
| geo2:ST_PointN (sf:Geometry geom) | xsd:integer | Returns the nth point of the given geometry literal | Attribute | No | N/A | No |
| geo2:ST_PointOnSurface (sf:Geometry geom) | xsd:integer | Returns a point guaranteed to lie on the surface of the given geometry literal | Attribute | No | Todo | No |
These functions work with boundingboxes (envelopes) of geometries and raster geometries of raster data. All functions are compatible with raster representations. They may be for example be used in SPARQL FILTER expressions.
| Function | Return Value | Description | Type | In GeoSPARQL? | Supports raster? | Stable? |
|---|---|---|---|---|---|---|
| geo2:ST_BBOXAbove (sf:Geometry geom) | xsd:boolean | Indicates if the boundingbox of literal one is completely above the boundingbox of literal two. | Relation | No | Yes | Yes |
| geo2:ST_BBOXBelow (sf:Geometry geom) | xsd:boolean | Indicates if the boundingbox of literal one is completely below the boundingbox of literal two. | Relation | No | Yes | Yes |
| geo2:ST_BBOXContains (sf:Geometry geom) | xsd:boolean | Indicates if the boundingbox of literal one is completely contains the boundingbox of literal two. | Relation | No | Yes | Yes |
| geo2:ST_BBOXEquals (sf:Geometry geom) | xsd:boolean | Indicates if the boundingbox of literal one equals the boundingbox of literal two. | Relation | No | Yes | Yes |
| geo2:ST_BBOXFPIntersects (sf:Geometry geom) | xsd:boolean | Indicates if the boundingbox of literal one intersects the boundingbox of literal two measuring with floating point precision. | Relation | No | Yes | Yes |
| geo2:ST_BBOXIntersects (sf:Geometry geom) | xsd:boolean | Indicates if the boundingbox of literal one intersects the boundingbox of literal two. | Relation | No | Yes | Yes |
| geo2:ST_BBOXIsContainedBy (sf:Geometry geom) | xsd:boolean | Indicates if the boundingbox of literal one is completely contained by the boundingbox of literal two. | Relation | No | Yes | Yes |
| geo2:ST_BBOXLeftOf (sf:Geometry geom) | xsd:boolean | Indicates if the boundingbox of literal one is completely left of the boundingbox of literal two. | Relation | No | Yes | Yes |
| geo2:ST_BBOXOverlapsAbove (sf:Geometry geom) | xsd:boolean | Indicates if the boundingbox of literal one is above of the boundingbox of literal two but overlaps with it. | Relation | No | Yes | Yes |
| geo2:ST_BBOXOverlapsBelow (sf:Geometry geom) | xsd:boolean | Indicates if the boundingbox of literal one is below of the boundingbox of literal two but overlaps with it. | Relation | No | Yes | Yes |
| geo2:ST_BBOXOverlapsLeft (sf:Geometry geom) | xsd:boolean | Indicates if the boundingbox of literal one is left of the boundingbox of literal two but overlaps with it. | Relation | No | Yes | Yes |
| geo2:ST_BBOXOverlapsRight (sf:Geometry geom) | xsd:boolean | Indicates if the boundingbox of literal one is right of the boundingbox of literal two but overlaps with it. | Relation | No | Yes | Yes |
| geo2:ST_BBOXRightOf (sf:Geometry geom) | xsd:boolean | Indicates if the boundingbox of literal one is completely right of the boundingbox of literal two. | Relation | No | Yes | Yes |
These functions create vector literal representations from Strings.
| Function | Return Value | Description | Type | In GeoSPARQL? | Supports raster? | Stable? |
|---|---|---|---|---|---|---|
| geo2:ST_GeomFromGeoJSON (xsd:string input) | sf:Geometry | Returns the parsed geometry from a GeoJSON String. | Constructor | No | N/A | Yes |
| geo2:ST_GeomFromGML (xsd:string input) | sf:Geometry | Returns the parsed geometry from a GML String. | Constructor | No | N/A | Yes |
| geo2:ST_GeomFromKML (xsd:string input) | sf:Geometry | Returns the parsed geometry from a KML String. | Constructor | No | N/A | Yes |
| geo2:ST_GeomFromText (xsd:string input) | sf:Geometry | Returns the parsed geometry from a WKT String. | Constructor | No | N/A | Yes |
| geo2:ST_GeomFromWKB (xsd:string input) | sf:Geometry | Returns the parsed geometry from a WKB String. | Constructor | No | N/A | Yes |
These functions manipulate vector geometry literals. They are not applicable to raster literals.
| Function | Return Value | Description | Type | In GeoSPARQL? | Supports raster? | Stable? |
|---|---|---|---|---|---|---|
| geo2:ST_AddGeometry (sf:Geometry geom,sf:Geometry toadd) | sf:Geometry | Returns a GeometryCollection with the added Geometry. | Editor | No | N/A | Yes |
| geo2:ST_EnsureClosed (sf:Geometry geom) | sf:Geometry | Returns a closed Geometry. | Editor | No | N/A | Yes |
| geo2:ST_RemoveGeometry (sf:Geometry geom,xsd:integer position) | sf:Geometry | Returns a GeometryCollection with a removed Geometry at a given position. | Editor | No | N/A | Yes |
| geo2:ST_RemoveRepeatedPoints (sf:Geometry geom,xsd:double tolerance) | sf:Geometry | Returns a Geometry with repeated points remove according to a given tolerance. | Editor | No | N/A | Yes |
| geo2:ST_SetGeometry (sf:Geometry geom,xsd:integer position) | sf:Geometry | Sets a geometry at the given position of the GeometryCollection. | Editor | No | N/A | Yes |
These functions convert vector literals to other geospatial vector data formats. These functions are applicable to rasters if they were vectorized beforehand.
| Function | Return Value | Description | Type | In GeoSPARQL? | Supports raster? | Stable? |
|---|---|---|---|---|---|---|
| geo2:ST_AsBinary (sf:Geometry geom) | xsd:string | Returns a Well-Known-Binary representation of the given geometry . | Export | No | N/A | Yes |
| geo2:ST_AsGeoJSON (sf:Geometry geom) | xsd:string | Returns a GeoJSON representation of the given geometry . | Export | No | N/A | Yes |
| geo2:ST_AsGeoURI (sf:Geometry geom) | xsd:string | Returns a GeoURI representation of the given geometry or of its centroid if not a point . | Export | No | N/A | Yes |
| geo2:ST_AsGML (sf:Geometry geom) | xsd:string | Returns a GML representation of the given geometry. | Export | No | N/A | Yes |
| geo2:ST_AsGPX (sf:Geometry geom) | xsd:string | Returns a GPX representation of the given geometry. | Export | No | N/A | Yes |
| geo2:ST_AsKML (sf:Geometry geom) | xsd:string | Returns a KML representation of the given geometry. | Export | No | N/A | Yes |
| geo2:ST_AsLatLonText (sf:Geometry geom) | xsd:string | Returns a Latitude/Longitude text representation of the given geometry. | Export | No | N/A | Yes |
| geo2:ST_AsText (sf:Geometry geom) | xsd:string | Returns a Well-Known-Text representation of the given geometry. | Export | No | N/A | Yes |
| geo2:ST_AsTextRound (sf:Geometry geom, xsd:double tolerance) | xsd:string | Returns a Well-Known-Text representation of the given geometry with rounded coordinates according to the second parameter. | Export | No | N/A | Yes |
| geo2:ST_AsTWKB (sf:Geometry geom) | xsd:string | Returns a Tiny Well-Known-Binary representation of the given geometry. | Export | No | N/A | Yes |
| geo2:ST_Dump (sf:Geometry geom) | xsd:string | Returns a list of space delimited geometry literals. | Export | No | N/A | Yes |
| geo2:ST_DumpPoints (sf:Geometry geom) | xsd:string | Returns a list of space delimited geometry literals of the points included in the given geometries. | Export | No | N/A | Yes |
These functions relate vector literals to other vector literals and/or raster data.
| Function | Return Value | Description | Type | In GeoSPARQL? | Supports raster? | Stable? |
|---|---|---|---|---|---|---|
| geo2:ST_AreaSimilarity (sf:Geometry geom, sf:Geometry geom2) | xsd:double | Returns the area similarity score of two vector geometry literals. | Relation | No | Todo | Yes |
| geo2:ST_CentroidDistance (sf:Geometry geom, sf:Geometry geom2) | xsd:double | Returns the centroid distance between two geometry literals. | Relation | No | Todo | Yes |
| geo2:ST_ClosestCoordinate (sf:Geometry geom, sf:Geometry geom2) | sf:Geometry | Returns the closest coordinate between two geometry literals. | Relation | No | Todo | Yes |
| geo2:ST_Contains (sf:Geometry geom, sf:Geometry geom2) | xsd:boolean | Returns true if the first geometry contains the second. | Relation | Yes | Yes | Yes |
| geo2:ST_ContainsProperly (sf:Geometry geom, sf:Geometry geom2) | xsd:boolean | Returns true if the first geometry properly contains the second. | Relation | Yes | Yes | Yes |
| geo2:ST_CoveredBy (sf:Geometry geom, sf:Geometry geom2) | xsd:boolean | Returns true if the first geometry is covered by the second. | Relation | Yes | Yes | Yes |
| geo2:ST_Covers (sf:Geometry geom, sf:Geometry geom2) | xsd:boolean | Returns true if the first geometry covers the second. | Relation | Yes | Yes | Yes |
| geo2:ST_Crosses (sf:Geometry geom, sf:Geometry geom2) | xsd:boolean | Returns true if the first geometry crosses the second. | Relation | Yes | Yes | Yes |
| geo2:ST_DFullyWithin (sf:Geometry geom, sf:Geometry geom2, xsd:double distance) | xsd:boolean | Returns true if geometry literal one is fully within a given distance of geometry literal two. | Relation | Yes | Todo | Yes |
| geo2:ST_Disjoint (sf:Geometry geom, sf:Geometry geom2) | xsd:boolean | Returns true if the first geometry and second geometry are disjoint. | Relation | Yes | Yes | Yes |
| geo2:ST_Distance (sf:Geometry geom, sf:Geometry geom2) | xsd:double | Returns the distance between two geometry literals. | Relation | Yes | Yes | Yes |
| geo2:ST_DistanceSphere (sf:Geometry geom, sf:Geometry geom2) | xsd:double | Returns the spheroid distance between two geometry literals. | Relation | Yes | Yes | Yes |
| geo2:ST_DWithin (sf:Geometry geom, sf:Geometry geom2, xsd:double distance) | xsd:boolean | Returns true if geometry literal one is within a given distance of geometry literal two. | Relation | Yes | Todo | Yes |
| geo2:ST_Equals (sf:Geometry geom, sf:Geometry geom2) | xsd:boolean | Returns true if the two geometries are equal. | Relation | No | Yes | Yes |
| geo2:ST_EqualNorm (sf:Geometry geom, sf:Geometry geom2) | xsd:boolean | Returns true if the two geometries are equal in their normalized form. | Relation | No | Yes | Yes |
| geo2:ST_EqualSRS (sf:Geometry geom, sf:Geometry geom2) | xsd:boolean | Returns true if the two geometries are using the same spatial reference system. | Relation | No | Yes | Yes |
| geo2:ST_EqualTopo (sf:Geometry geom, sf:Geometry geom2) | xsd:boolean | Returns true if the two geometries are topologically equal. | Relation | No | Yes | Yes |
| geo2:ST_EqualType (sf:Geometry geom, sf:Geometry geom2) | xsd:boolean | Returns true if the two geometry types are equal. | Relation | No | Yes | Yes |
| geo2:ST_FrechetDistance (sf:Geometry geom, sf:Geometry geom2) | xsd:double | Returns the Frechet Distance between two geometries. | Relation | No | Todo | Yes |
| geo2:ST_Intersection (sf:Geometry geom, sf:Geometry geom2) | sf:Geometry | Calculates the intersection between two geometries. | Relation | No | Yes | Yes |
| geo2:ST_Intersects (sf:Geometry geom, sf:Geometry geom2) | xsd:boolean | Returns true if the two geometries intersect. | Relation | No | Yes | Yes |
| geo2:ST_IntersectionMatrix (sf:Geometry geom, sf:Geometry geom2) | xsd:string | Returns the intersection matrix between to geometries. | Relation | No | Todo | Yes |
| geo2:ST_IntersectionPercentage (sf:Geometry geom, sf:Geometry geom2) | xsd:double | Returns the intersection matrix between to geometries. | Relation | No | Yes | Yes |
| geo2:ST_MaxDistance (sf:Geometry geom, sf:Geometry geom2) | xsd:double | Returns the distance between the most distance coordinates of the two given geometries. | Relation | No | Yes | Yes |
| geo2:ST_MaxDistance3D (sf:Geometry geom, sf:Geometry geom2) | xsd:double | Returns the distance between the most distance coordinates of the two given 3d geometries. | Relation | No | Todo | Yes |
| geo2:ST_Overlaps (sf:Geometry geom, sf:Geometry geom2) | xsd:boolean | Returns true if the two geometries overlap. | Relation | No | Yes | Yes |
| geo2:ST_ShortestLine (sf:Geometry geom, sf:Geometry geom2) | sf:LineString | Returns the shortest line between two geometries. | Relation | No | Todo | Yes |
| geo2:ST_ShortestLine3D (sf:Geometry geom, sf:Geometry geom2) | sf:LineString | Returns the shortest line between two 3d geometries. | Relation | No | Todo | No |
| geo2:ST_Touches (sf:Geometry geom, sf:Geometry geom2) | xsd:boolean | Returns true if the two geometries touch each other. | Relation | No | Yes | Yes |
| geo2:ST_Union (sf:Geometry geom, sf:Geometry geom2) | sf:Geometry | Returns the union of two geometries. | Relation | No | Yes | Yes |
| geo2:ST_Within (sf:Geometry geom, sf:Geometry geom2) | xsd:boolean | Returns true if the first geometry is within the second geometry. | Relation | No | Yes | Yes |
These functions transform vector literals according to the specified function. They are mostly not applicable to raster data.
| Function | Return Value | Description | Type | In GeoSPARQL? | Supports raster? | Stable? |
|---|---|---|---|---|---|---|
| geo2:ST_CollectionExtract (sf:Geometry geom,xsd:string type) | sf:Geometry | Returns a GeometryCollection version of the given geometry. | Transformation | No | N/A | Yes |
| geo2:ST_CollectionHomogenize (sf:Geometry geom) | sf:Geometry | Returns the simplest representation of a given geometry. | Transformation | No | N/A | Yes |
| geo2:ST_Densify (sf:Geometry geom, xsd:double tolerance) | sf:Geometry | Returns a densified version of the given geometry. | Transformation | No | N/A | Yes |
| geo2:ST_FlipCoordinates (sf:Geometry geom) | sf:Geometry | Returns a given geometry with the X/Y axis flipped. | Transformation | No | N/A | Yes |
| geo2:ST_Force2D (sf:Geometry geom) | sf:Geometry | Returns a 2D representation of a given geometry. | Transformation | No | N/A | Yes |
| geo2:ST_Force3D (sf:Geometry geom) | sf:Geometry | Returns a 3D representation of a given geometry. | Transformation | No | N/A | Yes |
| geo2:ST_Force3DM (sf:Geometry geom) | sf:Geometry | Returns a 3DM representation of a given geometry. | Transformation | No | N/A | Yes |
| geo2:ST_Force4D (sf:Geometry geom) | sf:Geometry | Returns a 4D representation of a given geometry. | Transformation | No | N/A | Yes |
| geo2:ST_ForceCollection (sf:Geometry geom) | sf:Geometry | Returns a gepometry collection of a given geometry. | Transformation | No | N/A | Yes |
| geo2:ST_Multi (sf:Geometry geom) | sf:Geometry | Returns a "Multi" version of the given geometry if applicable. | Transformation | No | N/A | Yes |
| geo2:ST_Normalize (sf:Geometry geom) | sf:Geometry | Returns a normalized version of the given geometry. | Transformation | No | N/A | Yes |
| geo2:ST_PrecisionReducer (sf:Geometry geom, xsd:double precisionvalue) | sf:Geometry | Returns a version of the given geometry with reduced precision. | Transformation | No | N/A | Yes |
| geo2:ST_Reverse (sf:Geometry geom) | sf:Geometry | Returns a geometry with reverse coordinates. | Transformation | No | N/A | Yes |
| geo2:ST_Simplify (sf:Geometry geom) | sf:Geometry | Returns a simplified geometry according to the Douglas-Peucker algorithm. | Transformation | No | N/A | Yes |
| geo2:ST_SimplifyPreserveTopology (sf:Geometry geom) | sf:Geometry | Returns a simplified geometry preserving its topology. | Transformation | No | N/A | Yes |
| geo2:ST_SimplifyVW (sf:Geometry geom) | sf:Geometry | Returns a simplified geometry calculated with the Visvalingam-Whyatt algorithm. | Transformation | No | N/A | Yes |
| geo2:ST_SwapOrdinates (sf:Geometry geom, xsd:string ordinatecode) | sf:Geometry | Swaps ordinate values according to a given ordinate String code. | Transformation | No | N/A | Yes |
These functions are applicable to LineString representations only and cannot be used with raster literals or other types of Geometries.
These functions return LineString specific attributes.
| Function | Return Value | Description | Type | In GeoSPARQL? | Supports raster? | Stable? |
|---|---|---|---|---|---|---|
| geo2:ST_EndPoint (sf:Geometry geom) | sf:Point | Returns the last point in the given LineString. | Attribute | No | N/A | Yes |
| geo2:ST_IsClosed (sf:Geometry geom) | xsd:boolean | Indicates if the LineString is closed, i. e. its first and last point are the same. | Attribute | No | N/A | Yes |
| geo2:ST_SelfIntersections (sf:Geometry geom) | sf:Geometry | Returns a MultiPoint of self intersections of the LineString. | Attribute | No | N/A | Yes |
| geo2:ST_StartPoint (sf:Geometry geom) | sf:Point | Returns the first point in the given LineString. | Attribute | No | N/A | Yes |
These functions are connected to point or coordinate representations of geometries and cannot mostly not be used with raster literals or other types of Geometries.
These functions return Point or coordinate specific attributes of geometries.
| Function | Return Value | Description | Type | In GeoSPARQL? | Supports raster? | Stable? |
|---|---|---|---|---|---|---|
| geo2:ST_M (sf:Geometry geom) | xsd:double | Returns the M coordinate of the given point. | Attribute | No | N/A | Yes |
| geo2:ST_MMax (sf:Geometry geom) | xsd:double | Returns the minimum M coordinate of the given geometry. | Attribute | No | N/A | Yes |
| geo2:ST_MMin (sf:Geometry geom) | xsd:double | Returns the maximum M coordinate of the given geometry. | Attribute | No | N/A | Yes |
| geo2:ST_X (sf:Geometry geom) | xsd:double | Returns the X coordinate of the given point. | Attribute | No | N/A | Yes |
| geo2:ST_XMax (sf:Geometry geom) | xsd:double | Returns the maximum X coordinate of the given geometry. | Attribute | No | N/A | Yes |
| geo2:ST_XMin (sf:Geometry geom) | xsd:double | Returns the minimum X coordinate of the given geometry. | Attribute | No | N/A | Yes |
| geo2:ST_Y (sf:Geometry geom) | xsd:double | Returns the Y coordinate of the given point. | Attribute | No | N/A | Yes |
| geo2:ST_YMax (sf:Geometry geom) | xsd:double | Returns the maximum Y coordinate of the given geometry. | Attribute | No | N/A | Yes |
| geo2:ST_YMin (sf:Geometry geom) | xsd:double | Returns the minimum Y coordinate of the given geometry. | Attribute | No | N/A | Yes |
| geo2:ST_Z (sf:Geometry geom) | xsd:double | Returns the Z coordinate of the given point. | Attribute | No | N/A | Yes |
| geo2:ST_ZMax (sf:Geometry geom) | xsd:double | Returns the maximum Z coordinate of the given geometry. | Attribute | No | N/A | Yes |
| geo2:ST_ZMin (sf:Geometry geom) | xsd:double | Returns the minimum Z coordinate of the given geometry. | Attribute | No | N/A | Yes |
These functions return Point specific attributes.
| Function | Return Value | Description | Type | In GeoSPARQL? | Supports raster? | Stable? |
|---|---|---|---|---|---|---|
| geo2:ST_GeneratePoints (sf:Geometry geom, xsd:integer amount) | sf:Geometry | Generates a MulitPoint geometry with the amount of points given as a parameter in the area of the geometry given in the first parameter. | Constructor | No | N/A | Yes |
| geo2:ST_MakePoint (xsd:double .... coords) | sf:Point | Creates a point from the given ordinate values. | Constructor | No | N/A | Yes |
| geo2:ST_MakePointM (xsd:double x, xsd:double y, xsd:double z) | sf:Point | Creates a measurement point from the given ordinate values. | Constructor | No | N/A | Yes |
| geo2:ST_PointFromText (xsd:string wkt) | sf:Point | Creates a Point from a given WKT string. | Constructor | No | N/A | Yes |
| geo2:ST_PointFromWKB (xsd:string wkt) | sf:Point | Creates a Point from a given WKB string. | Constructor | No | N/A | Yes |
These functions are applicable to Polygon representations only and cannot be used with raster literals or other types of Geometries.
These functions return LineString specific attributes.
| Function | Return Value | Description | Type | In GeoSPARQL? | Supports raster? | Stable? |
|---|---|---|---|---|---|---|
| geo2:ST_CircularityIndex (sf:Geometry geom) | xsd:double | Calculates the circularity index of the Polygon. | Attribute | No | N/A | Yes |
| geo2:ST_Circumcentre (sf:Geometry geom) | sf:Point | Returns the circumcentre of the Polygon. | Attribute | No | N/A | Yes |
| geo2:ST_ExteriorRing (sf:Geometry geom) | sf:Geometry | Returns the exterior ring of the Polygon. | Attribute | No | N/A | Yes |
| geo2:ST_HasDuplicateRings (sf:Geometry geom) | xsd:boolean | Indicates if the polygon has duplicate rings. | Attribute | No | N/A | Yes |
| geo2:ST_InteriorRingN (sf:Geometry geom, xsd:integer ringnum) | sf:Geometry | Returns the nth interior ring of the Polygon. | Attribute | No | N/A | Yes |
| geo2:ST_IsAcute (sf:Geometry geom) | xsd:boolean | Indicates if the polygon is acute. | Attribute | No | N/A | Yes |
| geo2:ST_IsConvex (sf:Geometry geom) | xsd:boolean | Indicates if the polygon is convex. | Attribute | No | N/A | Yes |
| geo2:ST_IsEquilateralTriangle (sf:Geometry geom) | xsd:boolean | Indicates if the polygon is an equilateral triangle. | Attribute | No | N/A | Yes |
| geo2:ST_IsIsocelesTriangle (sf:Geometry geom) | xsd:boolean | Indicates if the polygon is an isoceles triangle. | Attribute | No | N/A | Yes |
| geo2:ST_IsPointedTriangle (sf:Geometry geom) | xsd:boolean | Indicates if the polygon is a pointed triangle. | Attribute | No | N/A | Yes |
| geo2:ST_IsRightTriangle (sf:Geometry geom) | xsd:boolean | Indicates if the polygon is a right triangle. | Attribute | No | N/A | Yes |
| geo2:ST_IsScaleneTriangle (sf:Geometry geom) | xsd:boolean | Indicates if the polygon is a scalene triangle. | Attribute | No | N/A | Yes |
| geo2:ST_IsTriangle (sf:Geometry geom) | xsd:boolean | Indicates if the polygon is a triangle. | Attribute | No | N/A | Yes |
| geo2:ST_NRings (sf:Geometry geom) | xsd:integer | Returns the number of rings of the polygon. | Attribute | No | N/A | Yes |
| geo2:ST_NumInteriorRings (sf:Geometry geom) | xsd:integer | Returns the number of interior rings of the polygon. | Attribute | No | N/A | Yes |
These functions create Polygons from String representations.
| Function | Return Value | Description | Type | In GeoSPARQL? | Supports raster? | Stable? |
|---|---|---|---|---|---|---|
| geo2:ST_PolygonFromText (xsd:string text) | sf:Polygon | Parses a polygon from a given WKT string. | Editor | No | N/A | Yes |
| geo2:ST_PolygonFromWKB (xsd:string text) | sf:Polygon | Parses a polygon from a given WKB string. | Editor | No | N/A | Yes |
These functions modify Polygon representations.
| Function | Return Value | Description | Type | In GeoSPARQL? | Supports raster? | Stable? |
|---|---|---|---|---|---|---|
| geo2:ST_AddRing (sf:Polygon geom, sf:LineString ring) | sf:Polygon | Adds a ring to the given Polygon. | Editor | No | N/A | Yes |
| geo2:ST_RemoveRing (sf:Polygon geom, xsd:integer ringnum) | sf:Polygon | Removes a ring from the given Polygon. | Editor | No | N/A | Yes |
| geo2:ST_SetRing (sf:Polygon geom, sf:LineString ring, xsd:integer ringnum) | sf:Polygon | Sets a ring in the given Polygon. | Editor | No | N/A | Yes |
These functions are applicable to raster and vector data as they aim to deal with their coordinate reference system.
| Function | Return Value | Description | Type | In GeoSPARQL? | Supports raster? | Stable? |
|---|---|---|---|---|---|---|
| geo2:ST_EPSGToSRID (xsd:string epsg) | xsd:integer | Converts an EPSG CRS representation to an SRID representation. | SRID | No | Yes | Yes |
| geo2:ST_SetSRID (sf:Geometry geom, xsd:string epsg) | xsd:integer | Sets the SRID of a given literal. | SRID | No | Yes | Yes |
| geo2:ST_GetAxis1Name (sf:Geometry geom) | xsd:string | Returns the name of the first axis of the CRS. | SRID | No | Yes | Yes |
| geo2:ST_GetAxis1Orientation (sf:Geometry geom) | xsd:string | Returns the orientation of the first axis of the CRS. | SRID | No | Yes | Yes |
| geo2:ST_GetAxis2Name (sf:Geometry geom) | xsd:string | Returns the name of the second axis of the CRS. | SRID | No | Yes | Yes |
| geo2:ST_GetAxis2Orientation (sf:Geometry geom) | xsd:string | Returns the orientation of the second axis of the CRS. | SRID | No | Yes | Yes |
| geo2:ST_SRIDHasFlippedAxis (sf:Geometry geom) | xsd:boolean | Indicates if the SRID exhibits a flipped axis. | SRID | No | Yes | Yes |
| geo2:ST_SRIDToEPSG (xsd:integer srid) | xsd:string | Converts an SRID CRS representation to an EPSG representation. | SRID | No | Yes | Yes |
This section introduces supported raster/coverage functions.
This section includes raster literals which have been (partially) implemented. For now all given JUnit tests use the RasterHexWKB Format because of its ease of usage in JUnit tests and because of its compact representation. However, other literal types provide other opportunities for representing raster data. CoverageJSON is an emerging way to publish raster data, GeoTIFF may be used in already established OGC web services such as Web Map Services.
Planned further implementations:
- XYZ Gridded ASCII for the integration of Digital Elevation models
- ASCIIGrid Format
- GeoTIFF (using Apache SIS)
- NetCDF (using Apache SIS)
These functions returns attributes of a coverage/raster. They are not applicable to vector data. All rasters implemented assume one raster band by default, even though many raster bands may be supported in raster literals.
| Function | Return Value | Description | Type | In GeoSPARQL? | Supports raster? | Stable? |
|---|---|---|---|---|---|---|
| geo2:ST_Envelope (geo2:Raster rast) | sf:Geometry | Returns the envelope/minimum bounding box of the given raster. | Attribute | No | Yes | Yes |
| geo2:ST_HasNoBand (geo2:Raster rast, xsd:integer bandnum=1) | xsd:boolean | Returns true if a raster band of the given number exists, false otherwise. | Attribute | No | Yes | Yes |
| geo2:ST_Height (geo2:Raster rast) | xsd:double | Returns the height of the given raster. | Attribute | No | Yes | Yes |
| geo2:ST_IsEmpty (geo2:Raster rast) | xsd:boolean | Returns if the raster contains atomic values. | Attribute | No | Yes | Yes |
| geo2:ST_MaxValue (geo2:Raster rast, xsd:integer bandnum=1) | xsd:double | Returns the maximum atomic value of the given raster band. | Attribute | No | Yes | Yes |
| geo2:ST_MinValue (geo2:Raster rast, xsd:integer bandnum=1) | xsd:double | Returns the minimum atomic value of the given raster band. | Attribute | No | Yes | Yes |
| geo2:ST_NumBands (geo2:Raster rast) | xsd:integer | Returns the number of raster bands of the given raster. | Attribute | No | Yes | Yes |
| geo2:ST_NumXTiles (geo2:Raster rast) | xsd:integer | Returns the number of X tiles of the given raster. | Attribute | No | Yes | Yes |
| geo2:ST_NumYTiles (geo2:Raster rast) | xsd:integer | Returns the number of Y tiles of the given raster. | Attribute | No | Yes | Yes |
| geo2:ST_Value (geo2:Raster rast, xsd:integer bandnum=1, xsd:integer col, xsd:integer row) | xsd:double | Returns the atomic value in the given column/row of the raster. | Attribute | No | Yes | Yes |
| geo2:ST_Width (geo2:Raster rast) | xsd:double | Returns the height of the given raster. | Attribute | No | Yes | Yes |
These functions implemeent raster/map algebra operations.
| Function | Return Value | Description | Type | In GeoSPARQL? | Supports raster? | Stable? |
|---|---|---|---|---|---|---|
| geo2:ST_Add (geo2:Raster rast, geo2:Raster rast, xsd:integer bandnum=1, xsd:integer bandnum=1) | geo2:Raster | Returns the sum of the two rasters. | Attribute | No | Yes | Yes |
| geo2:ST_AddConst (geo2:Raster rast, xsd:integer bandnum=1, xsd:double const) | geo2:Raster | Returns the raster added by a constant value . | Attribute | No | Yes | Yes |
| geo2:ST_And (geo2:Raster rast, geo2:Raster rast, xsd:integer bandnum=1, xsd:integer bandnum=1) | geo2:Raster | Returns the anded version of the two rasters. | Attribute | No | Yes | Yes |
| geo2:ST_AndConst (geo2:Raster rast, xsd:integer bandnum=1, xsd:double const) | geo2:Raster | Returns the raster anded by a constant value . | Attribute | No | Yes | Yes |
| geo2:ST_Equal (geo2:Raster rast, geo2:Raster rast2) bandnum=1, xsd:double const) | geo2:Raster | Keeps raster values which equal . | Attribute | No | Yes | No |
| geo2:ST_Div (geo2:Raster rast, geo2:Raster rast, xsd:integer bandnum=1, xsd:integer bandnum=1) | geo2:Raster | Returns the divided version of the two rasters. | Attribute | No | Yes | Yes |
| geo2:ST_DivConst (geo2:Raster rast, xsd:integer bandnum=1, xsd:double const) | geo2:Raster | Returns the raster divided by a constant value . | Attribute | No | Yes | Yes |
| geo2:ST_Mult (geo2:Raster rast, geo2:Raster rast, xsd:integer bandnum=1, xsd:integer bandnum=1) | geo2:Raster | Returns the multiplied version of the two rasters. | Attribute | No | Yes | Yes |
| geo2:ST_MultConst (geo2:Raster rast, xsd:integer bandnum=1, xsd:double const) | geo2:Raster | Returns the raster multiplied by a constant value . | Attribute | No | Yes | Yes |
| geo2:ST_Or (geo2:Raster rast, geo2:Raster rast, xsd:integer bandnum=1, xsd:integer bandnum=1) | geo2:Raster | Returns the or'ed version of the two rasters. | Attribute | No | Yes | Yes |
| geo2:ST_OrConst (geo2:Raster rast, xsd:integer bandnum=1, xsd:double const) | geo2:Raster | Returns the raster or'ed by a constant value . | Attribute | No | Yes | Yes |
| geo2:ST_Subtract (geo2:Raster rast, geo2:Raster rast, xsd:integer bandnum=1, xsd:integer bandnum=1) | geo2:Raster | Returns the or'ed version of the two rasters. | Attribute | No | Yes | Yes |
| geo2:ST_SubtractConst (geo2:Raster rast, xsd:integer bandnum=1, xsd:double const) | geo2:Raster | Returns the raster or'ed by a constant value . | Attribute | No | Yes | Yes |
| geo2:ST_Xor (geo2:Raster rast, geo2:Raster rast, xsd:integer bandnum=1, xsd:integer bandnum=1) | geo2:Raster | Returns the xor'ed version of the two rasters. | Attribute | No | Yes | Yes |
| geo2:ST_XorConst (geo2:Raster rast, xsd:integer bandnum=1, xsd:double const) | geo2:Raster | Returns the raster xor'ed by a constant value . | Attribute | No | Yes | Yes |
These functions construct rasters.
| Function | Return Value | Description | Type | In GeoSPARQL? | Supports raster? | Stable? |
|---|---|---|---|---|---|---|
| geo2:ST_MakeEmptyRaster (xsd:integer width, xsd:integer height, xsd:double upperleftx, xsd:double upperlefty, xsd:double cellsize) | geo2:Raster | Returns a new raster with sample values according to the given parameters. | Attribute | No | Yes | No |
| geo2:ST_RastFromHexWKB (xsd:string hexwkb) | geo2:Raster | Returns a new raster parsed from a raster hexwkb string. | Attribute | No | Yes | No |
These functions raster export functions.
| Function | Return Value | Description | Type | In GeoSPARQL? | Supports raster? | Stable? |
|---|---|---|---|---|---|---|
| geo2:ST_AddBand (geo2:Raster rast,xsd:double[] banddata) | geo2:Raster | Returns the raster with modified nodata value. | Attribute | No | Yes | No |
| geo2:ST_SetBandNoDataValue (geo2:Raster rast,xsd:integer bandnum, xsd:double value) | geo2:Raster | Returns the raster with modified nodata value. | Attribute | No | Yes | Yes |
These functions raster export functions.
| Function | Return Value | Description | Type | In GeoSPARQL? | Supports raster? | Stable? |
|---|---|---|---|---|---|---|
| geo2:ST_AsRastHexWKB (geo2:Raster rast) | xsd:string | Returns the raster in rasterwkb representation. | Attribute | No | Yes | Yes |
Raster relation functions relate raster representation to other raster representations or vector geometries. For Raster/Vector relations see also Geometry/Raster relation functions
| Function | Return Value | Description | Type | In GeoSPARQL? | Supports vector? | Stable? |
|---|---|---|---|---|---|---|
| geo2:ST_rasterIntersection (geo2:Raster rast, geo2:Raster rast2) | geo2:Raster | Returns a new resized raster. | Attribute | No | Yes | Yes |
These functions perform transformations on single rasters.
| Function | Return Value | Description | Type | In GeoSPARQL? | Supports raster? | Stable? |
|---|---|---|---|---|---|---|
| geo2:ST_Rescale (geo2:Raster rast, xsd:integer width, xsd:integer height) | geo2:Raster | Returns a new rescaled raster. | Attribute | No | Yes | No |
| geo2:ST_Resize (geo2:Raster rast, xsd:integer width, xsd:integer height) | geo2:Raster | Returns a new resized raster. | Attribute | No | Yes | No |
| geo2:ST_SRID (geo2:Raster rast, xsd:integer srid) | geo2:Raster | Returns a reprojected raster. | Attribute | No | Yes | No |
This section will include descriptions for topology support which is currently not finished in the given implementation.
This section will include spatiotemporal support for geometries and possibly rasters. The implementation will begun when the standardization process of GeoSPARQL 2.0 has been matured and decides to include support for spatiotemporal operations.
These functions await standardization and may or may not be removed from the system. In particular they are not stable currently.
| Function | Return Value | Description | Type | In GeoSPARQL? | Supports raster? | Stable? |
|---|---|---|---|---|---|---|
| geo2:ST_After (geo2:TemporalRange range,geo2:TemporalRange range2) | xsd:boolean | Returns if the first temporal range lies after the second temporal range. | Attribute | No | N/A | Yes |
| geo2:ST_Before (geo2:TemporalRange range,geo2:TemporalRange range2) | xsd:boolean | Returns if the first temporal range lies before the second temporal range. | Attribute | No | N/A | Yes |
| geo2:ST_Between (geo2:TemporalRange range,geo2:TemporalRange range2, geo2:TempralRange range3) | xsd:boolean | Returns if the first temporal range lies in between the second and third temporal range. | Attribute | No | N/A | No |
| geo2:ST_During (geo2:TemporalRange range,geo2:TemporalRange range2, geo2:TempralRange range3) | xsd:boolean | Returns if the first temporal range lies in between the second and third temporal range. | Attribute | No | N/A | No |
Utility functions help to convert units and accompanying information for geospatial data.
These functions convert between units beginning from an S/I Base Unit.
| Function | Return Value | Description | Type | In GeoSPARQL? | Supports raster? | Stable? |
|---|---|---|---|---|---|---|
| geo2:ST_CentimeterToMeter (xsd:double cm) | xsd:double | Converts centimeter to meter. | Attribute | No | N/A | Yes |
| geo2:ST_ChainToMeter (xsd:double chain) | xsd:double | Converts chain to meter. | Attribute | No | N/A | Yes |
| geo2:ST_DecimeterToMeter (xsd:double decimeter) | xsd:double | Converts decimeter to meter. | Attribute | No | N/A | Yes |
| geo2:ST_FathomToMeter (xsd:double fathom) | xsd:double | Converts fathom to meter. | Attribute | No | N/A | Yes |
| geo2:ST_FootToMeter (xsd:double foot) | xsd:double | Converts foot to meter. | Attribute | No | N/A | Yes |
| geo2:ST_InchToMeter (xsd:double inch) | xsd:double | Converts inch to meter. | Attribute | No | N/A | Yes |
| geo2:ST_KilometerToMeter (xsd:double km) | xsd:double | Converts kilometer to meter. | Attribute | No | N/A | Yes |
| geo2:ST_LinkToMeter (xsd:double link) | xsd:double | Converts link to meter. | Attribute | No | N/A | Yes |
| geo2:ST_MeterToCentimeter (xsd:double meter) | xsd:double | Converts meter to centimeter. | Attribute | No | N/A | Yes |
| geo2:ST_MeterToChain (xsd:double meter) | xsd:double | Converts meter to chain. | Attribute | No | N/A | Yes |
| geo2:ST_MeterToDecimeter (xsd:double meter) | xsd:double | Converts meter to decimeter. | Attribute | No | N/A | Yes |
| geo2:ST_MeterToFathom (xsd:double meter) | xsd:double | Converts meter to fathom. | Attribute | No | N/A | Yes |
| geo2:ST_MeterToFoot (xsd:double meter) | xsd:double | Converts meter to foot. | Attribute | No | N/A | Yes |
| geo2:ST_MeterToInch (xsd:double meter) | xsd:double | Converts meter to inch. | Attribute | No | N/A | Yes |
| geo2:ST_MeterToKilometer (xsd:double meter) | xsd:double | Converts meter to kilometer. | Attribute | No | N/A | Yes |
| geo2:ST_MeterToLink (xsd:double meter) | xsd:double | Converts meter to link. | Attribute | No | N/A | Yes |
| geo2:ST_MeterToMile (xsd:double meter) | xsd:double | Converts meter to mile. | Attribute | No | N/A | Yes |
| geo2:ST_MeterToMillimeter (xsd:double meter) | xsd:double | Converts meter to millimeter. | Attribute | No | N/A | Yes |
| geo2:ST_MeterToNauticalMile (xsd:double meter) | xsd:double | Converts meter to nautical mile. | Attribute | No | N/A | Yes |
| geo2:ST_MeterToUSFoot (xsd:double meter) | xsd:double | Converts meter to US foot. | Attribute | No | N/A | Yes |
| geo2:ST_MeterToUSInch (xsd:double meter) | xsd:double | Converts meter to US inch. | Attribute | No | N/A | Yes |
| geo2:ST_MeterToUSMile (xsd:double meter) | xsd:double | Converts meter to US mile. | Attribute | No | N/A | Yes |
| geo2:ST_MeterToUSYard (xsd:double meter) | xsd:double | Converts meter to US yard. | Attribute | No | N/A | Yes |
| geo2:ST_MeterToYard (xsd:double meter) | xsd:double | Converts meter to yard. | Attribute | No | N/A | Yes |
| geo2:ST_MileToMeter (xsd:double mile) | xsd:double | Converts mile to meter. | Attribute | No | N/A | Yes |
| geo2:ST_MillimeterToMeter (xsd:double millimeter) | xsd:double | Converts millimeter to meter. | Attribute | No | N/A | Yes |
| geo2:ST_NauticalMileToMeter (xsd:double mile) | xsd:double | Converts nautical mile to meter. | Attribute | No | N/A | Yes |
| geo2:ST_USFootToMeter (xsd:double usfoot) | xsd:double | Converts US foot to meter. | Attribute | No | N/A | Yes |
| geo2:ST_USInchToMeter (xsd:double usinch) | xsd:double | Converts US inch to meter. | Attribute | No | N/A | Yes |
| geo2:ST_USMileToMeter (xsd:double usmile) | xsd:double | Converts US mile to meter. | Attribute | No | N/A | Yes |
| geo2:ST_USYardToMeter (xsd:double usyard) | xsd:double | Converts US yard to meter. | Attribute | No | N/A | Yes |
| geo2:ST_YardToMeter (xsd:double yard) | xsd:double | Converts yard to meter. | Attribute | No | N/A | Yes |
The GeoSPARQL ontology has been extended to include support for Coverage representations.
An ontology of the planned functions with given URIs has been uploaded to this repository as functions.ttl . The ontology will be appended when the implementation matures and new requirements are considered. The ontology of functions may serve as a template for future standardizations or implementations.
The ontology model for the GeoSPARQL extension may be downloaded here: geosparqlplus.ttl In addition to the GeoSPARQL ontology it includes a Coverage class hierarchy and new properties for dealing with raster data.