The dataset on the national spatial reference system (SRS) contains: - data on the national coordinate reference systems (CRS) and height reference systems (HRS), - data on datum transformations between different national coordinate reference systems and between different height reference systems, and - data on hierarchical geographic coordinate grids. The data on the national coordinate/height reference systems contain parameters defining: - national horizontal geodetic datums, including geometrical parameters of the Earth as a planet, the coreresponding reference surface – rotational ellipsoid – and national map projection, and - national height geodetic datum, including physical parameters of the Earth, the height reference surface – (quasi-)geoid – and types of the national height systems. The data on datum transformations contain: - detailed specifications on transformation models with equations and - the corresponding sets of transformation parameters. The data on the national CRSes, HRSes and datum transformations are also supported by the internationally standardized descriptions with unique codes within the EPSG Geodetic Parameter Dataset. Geographical coordinate grids are also available as graphical layers in the Shape format (SHP-files).
The collection of topographic data is maintained in the form of the National Topographic Model (DTM), which contains graphical and attribute-based topographic data on features that correspond to the accuracy of the 1:5,000 scale. The DTM includes topographic data for the territory of Slovenia in compliance with INSPIRE guidelines. The DTM also comprises geographical names and a digital terrain model. DTM data can be used for geolocating other spatial data, as a base for the display of graphical components of municipal spatial planning documents, and for the purposes of digital cartography. The data can also be linked to datasets from various administrative sectors.