Data50 is a geograpfical model of territory of the Czech Republic. It has been derived from a cartographic database for Base map CR 1 : 50 000 and it is totally comprised of 8 thematic groups- Settlements, cultural and industrial buildings, Pipelines and electric lines, Hydrography, Boundary of territorial units, Vegetation and bare surface, Terrain and Names. Thematic group Pipelines and electric lines contains 2 feature types- Pipeline, Electric line.