GetProjectionFactor - ObjectVision/GeoDMS GitHub Wiki

Unit functions GetProjectionFactor

• GetProjectionFactor(gridunit)

GetProjectionFactor(gridunit) results in a parameter with a dpoint value type, indicating the gridsize in both X and Y directions.

The grid size is expressed in the unit of the coordinate system.

The GetProjectionFactor function in combination with the GetProjectionOffset function was used to calculate grid relations for a set of points.

Since GeoDMS version 7.015 this is done with the value function, see Configuration examples Grid.

• unit gridunit with Point value type of the group CanBeDomainUnit

5.44

unit<fpoint> rdc_meter: range = "[{300000, 0}, {625000, 280000})";
unit<spoint> rdc_100 :=
   range(
      gridset(
          rdc_meter
         ,point(  -100f,   100f, rdc_meter)
         ,point(625000f, 10000f, rdc_meter)
         ,spoint
      )
      ,point(   0s,    0s)
      ,point(3250s, 2700s)
   );

parameter<dpoint> projFactor := GetProjectionFactor(rdc_100);

result: projFactor = [(-100.0, 100.0)].

• GetProjectionBase
• GetProjectionOffset