gml:coverageFunction

The gml:coverageFunction property describes the mapping function from the domain to the range of the coverage.
The value of the CoverageFunction is one of gml:CoverageMappingRule and gml:GridFunction.
If the gml:coverageFunction property is omitted for a gridded coverage (including rectified gridded coverages) the gml:startPoint is assumed to be the value of the gml:low property in the gml:Grid geometry, and the gml:sequenceRule is assumed to be linear and the gml:axisOrder property is assumed to be "+1 +2".

Element information

Content

• Choice [1..1]
  • gml:MappingRule
  • gml:CoverageMappingRulegml:CoverageMappingRule provides a formal or informal description of the coverage function. The mapping rule may be defined as an in-line string (gml:ruleDefinition) or via a remote reference through xlink:href (gml:ruleReference). If no rule name is specified, the default is 'Linear' with respect to members of the domain in document order.
  • gml:GridFunctiongml:GridFunction provides an explicit mapping rule for grid geometries, i.e. the domain shall be a geometry of type grid. It describes the mapping of grid posts (discrete point grid coverage) or grid cells (discrete surface coverage) to the values in the range set. The gml:startPoint is the index position of a point in the grid that is mapped to the first point in the range set (this is also the index position of the first grid post). If the gml:startPoint property is omitted the gml:startPoint is assumed to be equal to the value of gml:low in the gml:Grid geometry. Subsequent points in the mapping are determined by the value of the gml:sequenceRule.

Attributes

None

Used in

• Type gml:AbstractContinuousCoverageType (Element gml:AbstractContinuousCoverage)
• Type gml:ArrayAssociationType (Element gml:members)
• Type gml:DiscreteCoverageType (Elements gml:AbstractDiscreteCoverage, gml:MultiPointCoverage, gml:MultiCurveCoverage, gml:MultiSurfaceCoverage, gml:MultiSolidCoverage, gml:GridCoverage, gml:RectifiedGridCoverage)

Substitution hierarchy

• gml:AbstractObject
  • can be substituted with gml:coverageFunction

Sample instance

<gml:coverageFunction>
   <gml:MappingRule>string</gml:MappingRule>
</gml:coverageFunction>