search

opengeospatial / CRS-Gridded-Geodetic-data-eXchange-Format

Gridded Geodetic data eXchange Format
11 stars 3 forks source link

Extend GGXF Conventions check point capability #64

Closed RogerLott closed 11 months ago

RogerLott commented 11 months ago

The checkPoints capability in r4 and earlier allows for expected results of coordinate operations to be included in the file header. By requiring sourceCrsCoordinates it precludes (without using a workaround) the inclusion of data just to check correct access to and/or interpolation of grid data, whether or not the file content supports a coordinate operation. The corrections to address this are trivial.

Firstly, a keyword interpolationCrsCoordinates needs to be added, with definition of "Tuple of coordinates at a check point referenced to the interpolation CRS defined in the GGXF file header. The sequence of coordinates shall be that defined for the CRS in the file header." It should be accompanied by a keyword interpolationCoordinateEpoch. (i.e. both very similar to existing definition of sourceCrsCoordinates and targetCrsCoordinates). Secondly the definition of checkPoints needs to be amended to require either interpolationCrsCoordinates or sourceCrsCoordinates.

RogerLott commented 11 months ago

Updated in r5.

ccrook commented 11 months ago

Amended version released in GGXF v-1-0 OGC-22-051r5_2023-10-17.pdf