Rule-based Spatial Query and Production as Part of the WHPA Simulation

To allow spatial query and spatial production i.e. analysis in an Geographic Information System (GIS) environment a rule-based approach is suggested. It enables analysis based on spatial conditions of maps and additionally non-spatial facts. The rule base documents the spatial modeling process and can be reused for similar routine decisions. Examples form the delineation of well head protection areas (WHPA) illustrate this approach. The language for the rules is Lisp extended by spatial analysis functionality using a spatial vector structure (Open GIS Standard or ESRI shape files). It is implemented in Java.