The DAT Regulation provides detailed descriptions of the procedures of design, production, revision and maintenance of digital base maps (Hungarian acronym DAT), about their data exchange format, documentation, control, quality control, verification and State acceptance, also the conversion of numeric and digital data of land surveying base maps into digital base maps and their quality control. 

From 1996 on, it is mandatory to produce the national land surveying base maps in line with the professional specifications of DAT regulations. On-site control is also obligatory in every case.

The DAT Regulation consists of the following parts:

• DAT1 Regulation: Design, production, revision and maintenance of digital base maps, their data exchange format, documentation, control, quality control, verification and State acceptance.

• DAT2 Regulation: Conversion of land surveying base maps into digital base maps and their quality control.

• DAT1-M1: Annex to DAT1. Structure, data tables and data exchange formats; rules of application

• DAT1-M2: Annex to DAT1. Legends of the digital base map.

• DAT1-M3: Annex to DAT1. Land office software for examining and verifying the internal consistence of digital base map data.

• DAT2-M1: Annex to DAT2. Starting data and a computation software (TRAFO) for transformation among projection systems applied in Hungary (STG, HÉR, HKR, HDR, EOV, BOV) based on unified requirements and accuracy.

The DAT Regulation is available at the Institute of Geodesy, Cartography and Remote Sensing (FÖMI).