The Basic Topographic Map of the Czech Republic 1 : 250 000 in the S-JTSK planar coordinate system (S-JTSK), hereinafter referred to as ZTM 250/S-JTSK, is a fundamental state map series. As of 1 July 2023, ZTM 250/S-JTSK replaces the Basic Map of the Czech Republic 1 : 200 000 (ZM 200). ZTM 250/S-JTSK depicts the entire territory of the Czech Republic in a continuous layout of map sheets, with the Czech Republic represented on 12 map sheets.
The section lines (inner frames) of the ZTM/S-JTSK map sheet layout form rectangles whose sides run parallel to the S-JTSK coordinate axes and measure 500 mm in the Y-axis direction and 400 mm in the X-axis direction at the relevant map scale. A ZTM 250/S-JTSK map sheet therefore covers an area of 125 km × 100 km. This size does not include accompanying elements present in the printed version (e.g., overlap strips, marginal and extra-frame information). The dimensions of the printed map including all marginal and extra-frame elements are 480 mm × 700 mm.
ZTM 250/S-JTSK map sheets are labelled using a numeric nomenclature based on a system of rows and columns. Each sheet is also assigned a name corresponding to the largest settlement shown on that sheet. The map sheets are labelled with a row and column number, where the northernmost row is numbered 1 (followed southward by 2, 3, 4), and the westernmost column is numbered 1 (followed eastward by 2, 3, 4). An example of a map sheet designation is 23 Hradec Králové.
ZTM 250/S-JTSK contains planimetry, hypsometry and descriptive elements. Planimetric content includes settlements, transport infrastructure, water bodies, boundaries of administrative units, boundaries of large protected areas, and vegetation and land-surface features. Hypsometry depicts the terrain using contours with a basic interval of 50 meters, terrain breaks, rock formations, and spot heights with listed elevations. The descriptive content consists of standardized geographical names, names of municipalities and their parts, contour labels and spot-height labels, names of districts and protected areas. The printed map sheets and the PDF print-base data files also contain the S-JTSK and ETRS89-TMzn kilometre grids, the ETRS89 geographic grid, the map frame with marginal elements (e.g., descriptions of neighbouring states, relevant protected areas, orographic units, coordinates), and extra-frame information (e.g., legends, imprint data, graphic, numeric and slope scales, interpolation scale of the ETRS89 geographic coordinate grid, graphic representation of the map within the sheet layout, meridian convergence and magnetic declination, etc.).
Map content is shown only within the territory of the Czech Republic. To ensure graphical clarity, ZTM 250 uses methods of cartographic generalization—selection based on quantitative and qualitative criteria (including omission or reduction of features), geometric generalization (displacement, simplification and merging of areas), and reclassification (combining multiple feature categories into a single category).
Processing of ZTM 250/S-JTSK data began in 2021, and full coverage of the Czech Republic was completed in April 2023. The map is produced using digital technology from the Data250 cartographic database, updated based on the Fundamental Base of Geographic Data of the Czech Republic (ZABAGED^®) and the Geonames database of geographic names.
The creation and updating of ZTM 250/S-JTSK is provided by the Czech Office for Surveying, Mapping and Cadastre, which publishes ZTM 250/S-JTSK data free of charge as open data in the form of data files of the map content including extra-frame information corresponding to map sheets in PDF format (PDF print files), in the form of georeferenced raster data files corresponding to map sheets in TIFF format (TIFF raster tiles), and in the form of vector data files containing the ZTM 250/S-JTSK cartographic model corresponding to map sheets in SHP and DGN8 formats (SHP/DGN8 vector data).

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