db/conf/gis/WidmannB97.html Norbert Widmann Peter Baumann Towards Comprehensive Database Support for Geoscientific Raster Data. 54-57 GIS1997/P054.pdf 1997 conf/gis/97 ACM-GIS http://doi.acm.org/10.1145/267825.267840 db/conf/gis/gis97.html#WidmannB97