The Basic Topographic Map of the Czech Republic 1 : 250 000 in the planar coordinate system of the European Terrestrial Reference System 1989 in the Universal Transverse Mercator projection of meridian zones (ETRS89-TMzn), hereinafter referred to as ZTM 250/ETRS89, is a fundamental state map series. As of 1 July 2023, ZTM 250/ETRS89 expands the state map series by offering a variant of ZTM 250 in the ETRS89-TMzn coordinate system, serving as an alternative to ZTM 250 in the national coordinate system S-JTSK. In terms of content, ZTM 250/ETRS89 does not differ from the primary ZTM 250/S-JTSK. ZTM 250/ETRS89 represents the entire territory of the Czech Republic in a continuous layout of map sheets, with the Czech Republic displayed on 12 map sheets.
The section lines (inner frames) of the ZTM/ETRS89 layout are formed by images of meridians and parallels at intervals determined by the map scale. A ZTM 250/ETRS89 map sheet therefore covers an area of 1° × 2° (latitude × longitude). This size does not include accompanying elements printed on the physical map sheet (e.g., overlap strips, marginal and extra-frame information). The dimensions of the printed map, including all marginal and extra-frame elements, are 550 mm × 800 mm. The TIFF raster tiles measure 485 mm × 637 mm and cover not only the area of the relevant map sheet but also the overlap strip into adjacent sheets.
ZTM 250/ETRS89 map sheets are labelled using alphanumeric nomenclature derived from the International Map of the World 1 : 1 000 000 (for the Czech Republic: NM-33 and NM-34), which spans 6 degrees of longitude and 4 degrees of latitude. Additional characters specify the position of a map sheet of this scale within the corresponding map sheet of the smaller-scale series from which it is derived. Each sheet is also assigned a name, typically corresponding to the largest settlement occurring on that sheet. ZTM 250/ETRS89 sheets are created by dividing a sheet of the International Map of the World 1 : 1 000 000 into 4 rows of 1° latitude and 3 columns of 2° longitude, forming 12 sheets, labelled consecutively within the parent sheet from the northwest corner as numbers 01 to 12. An example of a designation is NM-33-08 Jihlava.
ZTM 250/ETRS89 contains planimetry, hypsometry and descriptive elements. Planimetric content includes settlements, transport infrastructure, water bodies, administrative boundaries, boundaries of large protected areas, and vegetation and land-surface features. Hypsometry shows 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 PDF print-base data files also contain the ETRS89-TMzn and S-JTSK kilometre grids, the ETRS89 geographic grid, a map frame with marginal elements (e.g., descriptions of neighbouring states, affected protected areas and orographic units, coordinates), and extra-frame information (e.g., legends, imprint details, graphic, numeric and slope scales, interpolation scale of the ETRS89 geographic grid, graphical representation of the map within the map-sheet layout, meridian convergence and magnetic declination, etc.).
Map content is shown only within the territory of the Czech Republic. To ensure graphical clarity in ZTM 250, methods of cartographic generalization are applied—censual and normative selection (omitting features based on quantitative and qualitative criteria or further reducing their number), geometric generalization (displacement, simplification, and merging of areas), and reclassification (combining multiple feature categories into one).
Processing of ZTM 250/ETRS89 data began in 2021, and full coverage of the Czech Republic was completed in May 2023. The map is produced by transforming data from ZTM 250/S-JTSK and subsequently checking and supplementing marginal and extra-frame information. The underlying data for ZTM 250/S-JTSK are 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/ETRS89 is carried out by the Czech Office for Surveying, Mapping and Cadastre, which publishes ZTM 250/ETRS89 data free of charge as open data in the form of data files containing the map content including extra-frame elements corresponding to map sheets in PDF format (PDF print files) and georeferenced raster data files corresponding to map sheets in TIFF format (TIFF raster tiles).

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