van den Bos, J.van Naelten, M.Teunissen, W.2014-07-312014-07-3119841467-8659https://doi.org/10.1111/j.1467-8659.1984.tb00093.xIDECAP is a database type information system. It is different from regular database systems as the information is mainly presented via thematic maps displayed on a graphics screen. Retrieval of information is usually achieved by means of graphical interaction with these images. The system utilizes interaction techniques and systems software from interactive computer graphics, using vector graphic and colour raster graphic stations for output. The present databank contains data based on grids and polygonal data. The system is being applied, but not restricted, to the Dutch 1971 Census data and the 1978 land use data. It allows the mapping of grid variables against a topographic background. Areas of interest can be investigated in detail by zooming in on a window drawn on the graphics screen by the user. Maps can be adjusted by user-definable class distributions shown in the form of histograms with standard deviations.10.1111/j.1467-8659.1984.tb00093.x91-102