The Basic Topographic Map of the Czech Republic 1:50,000 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 50/ETRS89, is a basic state map series. As of 1 July 2023, ZTM 50/ETRS89 expands the state map series with a variant of ZTM 50 in the ETRS89-TMzn planar coordinate system, thus serving as an alternative to ZTM 50 in the national S-JTSK coordinate system. In terms of content, ZTM 50/ETRS89 does not differ from the primary ZTM 50/S-JTSK. ZTM 50/ETRS89 depicts the entire territory of the Czech Republic in a continuous layout of map sheets; the territory of the Czech Republic is shown on 222 map sheets.
The sectional lines of the layout (internal frames) of the ZTM/ETRS89 map sheets form images of meridians and parallels at intervals determined by the map scale. A ZTM 50/ETRS89 map sheet thus covers an area of 10′ × 20′ (latitude × longitude). The dimensions do not include supplementary elements printed in the map sheet variant (e.g., the adjoining strip and frame and marginal information). The dimensions of the printed map including all frame and marginal information are 480 mm × 770 mm. TIFF raster tiles have a size of 411 mm × 522 mm and include not only the area of the corresponding map sheet but also the adjoining strip extending into neighbouring sheets.
The ZTM 50/ETRS89 map sheets are labelled with alphanumeric nomenclature based on the designation of the International Map of the World 1:1,000,000 (for the Czech Republic NM-33 and NM-34), whose sheets cover 6 degrees of longitude and 4 degrees of latitude. Additional characters specify the position of the map sheet of the given scale within the map sheet of a smaller scale from which it is derived. Map sheets are additionally labelled with a name, usually identical to the name of the largest settlement appearing on the respective sheet. If the sheet contains no settlement, another unique geographical name (a peak, watercourse, land tract) from that sheet is used. ZTM 50/ETRS89 map sheets are created by dividing a ZTM 100/ETRS89 sheet into 4 map sheets using 2 rows of 10 minutes of latitude and 2 columns of 20 minutes of longitude; within each ZTM 100/ETRS89 sheet they are labelled sequentially in rows from the northwest sheet with the letters A, B, C, D. An example of a sheet designation is Žďár nad Sázavou NM-33-08-6-B.
ZTM 50/ETRS89 contains planimetric features, hypsography, and descriptive information. The planimetric content includes settlements and significant economic and cultural objects, transport infrastructure, water bodies, boundaries of administrative units and cadastral areas, boundaries of large-scale protected areas, vegetation, and land cover. The hypsographic content depicts terrain relief using contour lines with a basic contour interval of 10 metres, terrain steps, rock formations, and spot heights with indicated elevations. The descriptive part of the map consists of standardized geographical names, names of municipalities and their parts, names and codes of cadastral areas and territorial-technical units, contour line elevations and spot heights, and names of protected areas. Printed map sheets and data files containing the print base of the map in PDF format also include the ETRS89-TMzn and S-JTSK kilometre grid and the ETRS89 geographic grid, the map frame with frame information (e.g., directional data of selected roads, names of nearby settlements, descriptions of neighbouring states, coordinates), and marginal information (e.g., legend, publishing data, graphic, numerical and slope scales, interpolation scale of the ETRS89 geographic grid, graphic depiction of the map within the sheet layout, indication of meridian convergence and magnetic declination, graphic overview of administrative boundaries, graphic depiction of elevation patterns on the sheet in the form of colour hypsometry, etc.).
Map content is shown only within the territory of the Czech Republic. To ensure graphic clarity, planimetric depiction in ZTM 50 applies methods of cartographic generalization — selective omission based on quantitative and qualitative parameters (including further reduction of elements), geometric generalization (displacement, shape simplification and merging of areas), and reclassification (grouping several categories of features into one category).
Processing of ZTM 50/ETRS89 data began in 2020 and the complete coverage of the territory of the Czech Republic was finished in May 2023. The map is produced by transforming ZTM 50/S-JTSK data and subsequently verifying the data and adding frame and marginal information. The underlying datasets for ZTM 50/S-JTSK are the Fundamental Base of Geographic Data of the Czech Republic (ZABAGED^®) and the Czech geographical names database Geonames.
The creation and updating of ZTM 50/ETRS89 is ensured by the Czech Office for Surveying, Mapping and Cadastre, which publishes ZTM 50/ETRS89 data free of charge as open data in the form of data files containing map content including marginal information corresponding to the map sheets in PDF format (PDF print files), and in the form of georeferenced data files containing map content corresponding to the map sheets in TIFF format (TIFF raster tiles).


The product’s file data are provided in selected formats via ATOM download services as open data, free of charge, under the Creative Commons CC BY 4.0 licence.

Another means of distributing the data is exporting data extracts in the Map Viewer application.

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