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Kessell ( 1988 ) describes a PC-based GIS called PREPLAN ( PRistine Environment Planning LANguage ) which is a natural area management , land-use planning and fire modelling system developed for the Australian National Parks and Wildlife Service , PREPLAN comprises four modules : a simple raster-based GIS ; a grid cell resource database ; a wide range of vegetation , fuel , fire behaviour , erosion and land-use models ; tabular , statistical and colour graphics output system .