Mapping_count - ObjectVision/GeoDMS GitHub Wiki

Aggregation functions mapping_count

• mapping_count(orgGridUnit, destGridUnit, value type)

• mapping_count(orgGridUnit, destGridUnit, value type) is defined as the count of the number of cells of the orgGridUnit domain unit in the destGridUnit domain, expressed in the value type argument.

The mapping_count(orgGridUnit, destGridUnit, uint32) function is synonym for pcount (mapping(orgGridUnit,destGridUnit)).

Use the mapping_count function if the number of cells in the orgGridUnit is very large (the mapping function would than also result in a large data item).

The explicit configuration of the value type argument is also useful to limit the size of the resulting data item.

Domain units orgGridUnit and destGridUnit with a Point value type of the group CanBeDomainUnit.

7.160

attribute<uint16> countNr15Cells (GridDomain3000) := mapping_count(GridDomain15, GridDomain3000, uint16);

domain GridDomain3000, nr of rows = 9

• mapping