INSPIRE Community Forum

Wrong value type of Geometry attribute in StatisticalGridCell [SU]



The StatisticalGridCell featureType in the grid package of the Statisical Units (SU) model contains a wrong value type for the Geometry attribute. Using this value type unables WFS to generate geometries for features.

Detailed description:

In the Statistical Units data model the geometry attribute of StatisticalGridCell is defined as GM_Polygon. See:

However according to ISO 19107 GM_Polygon is a specialization of the GM_SurfacePatch abstract type. ISO definitions state the following:

"A GM_Polygon is a surface patch that is defined by a set of boundary curves and an underlying
surface to which these curves adhere."

"GM_SurfacePatch defines a homogeneous portion of a GM_Surface"


Since GM_Polygon is not an independent type it cannot be used as value type for geometry of StatisticalGridCell. Therefore WFS using the current SU schema does not generate geometry for features.

Proposed solution:

Change value type for Geometry of StatisticalGridCell from GM_Polygon to GM_Surface.

Discussion topic:


  • Bresters PIETER

    I don't see a problem in changing this.


    The change should be absolutely done. The GML files created in accordance with the present XML Scheme doesn't comply with the rules under ISO 19136 (GML specyfication). This can cause problems with automatic generation of GML and its reading by the users.