WMS service displays the Radiometric field map of the Czech Republic 1:500,000 (M. Manová, M. Matolín, 1995). This map was published by the Czech Geological Survey in the Atlas of map of Czech Republic (GEOCR500) in 1998. Data on the gamma dose rate of rocks are based on regional and detailed airborne measurement of terrestrial radiation. The data of the map illustrate the regional distribution of natural radionuclides in rocks in the Czech Republic.