Spatial Mapping

Hydrological models usually have a schematization or grid that represents the spatial resolution of the model. For groundwater models, regular or non-regular two- or three-dimensional grids may be used, whereas river models typically use a one-dimensional grid. Conceptual catchment models may use a closed polygon to describe the catchment boundary.
When models with different spatial schematizations are linked, the values associated to one schematization in the source model must be transformed to be represented on the schematization of the target model. In order to make such transformations possible for any combination of models a standardized representation, the ISpatialDefinition interface has been introduced in the TimeSpace extension of the OpenMI Standard 2 (see Figure below). The type of spatial reference is defined by a the Wkt (well-known text) string as it is common in the OGC compliant GIS world, s. http://spatialreference.org. The version property allows dynamical spatial constructions, e.g. following the track of a ship or the eye of a hurricane. The IElementSet interface, known from previous versions, is now an extension to ISpatialDefinition.

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