in this section you learned the following
ILWIS uses two type map: vector map and raster map.
vector map in ILWIS are either point maps, segment map or polygon maps
vector maps can be obtained either by digitizing analog maps, or by importing them from other sources
raster maps can be obtained either by rasterizing vector maps, by importing them from other sources or by performing GIS image processing operations in ILWIS
raster map, polygon maps, segment maps, point maps, tables and columns are celled data objects. they contain the actual data