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Gerry, We also have the same problem with lack of support (in data models) for unstructured/irregular grids for our coastal models. ISO 19123 is big enough to handle them, but both the NetCDF and the GML communities don't have this in their implementations. Although GML is now in revision to handle irregular spacing in grids, it still doesn't handle unstructured grids. If anyone is putting a project together to address this, we'd be happy to support it. Keiran