The Basic Topographic Map of the Czech Republic 1:50,000 in the planar coordinate system of the Unified Cadastral Trigonometric Network (S-JTSK), hereinafter referred to as ZTM 50/S-JTSK, is a basic state map series. As of 1 July 2023, ZTM 50/S-JTSK replaces the Basic Map of the Czech Republic 1:50,000 (ZM 50). ZTM 50/S-JTSK depicts the entire territory of the Czech Republic in a continuous layout of map sheets; the territory of the Czech Republic is shown on 202 map sheets.
The sectional lines of the layout (internal frames) of the ZTM/S-JTSK map sheets 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 scale of the respective map. A ZTM 50/S-JTSK map sheet thus covers an area of 25 km × 20 km. The dimensions do not include supplementary elements shown on the printed version of the map sheet (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.
The ZTM 50/S-JTSK map sheets are labelled with alphanumeric nomenclature that specifies the position of the ZTM 50/S-JTSK map sheet within the map sheet of a smaller scale from which it is derived. Map sheets are additionally provided with a name, usually identical to the name of the largest settlement appearing on the respective sheet. If no settlement appears on the sheet, another unique geographical name (a summit, watercourse, land tract) from that sheet is used. ZTM 50/S-JTSK map sheets are created by dividing a ZTM 100/S-JTSK map sheet into 4 map sheets using 2 rows and 2 columns; within the ZTM 100/S-JTSK sheet they are labelled sequentially in rows from the northwest corner with the letters A, B, C, D. An example of a sheet designation is Žďár nad Sázavou 0506-D.
ZTM 50/S-JTSK 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 S-JTSK and ETRS89-TMzn 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 information, graphic, numerical and slope scales, interpolation scale of the ETRS89 geographic grid, graphic depiction of the sheet within the map 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.).
The 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 criteria (including further reduction of elements), geometric generalization (displacement, simplification of shapes, and merging of areas), and reclassification (grouping several categories of features into one category).
Processing of ZTM 50/S-JTSK data began in 2020 and full coverage of the Czech Republic was completed in April 2023. The map is produced using digital technology from the Data50 cartographic database, updated on the basis of the Fundamental Base of Geographic Data of the Czech Republic (ZABAGED^®) and the Czech geographic names database Geonames.
The creation and updating of ZTM 50/S-JTSK is ensured by the Czech Office for Surveying, Mapping and Cadastre, which publishes ZTM 50/S-JTSK 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), in the form of georeferenced data files containing map content corresponding to the map sheets in TIFF format (TIFF raster tiles), and in the form of vector data files containing the ZTM 50/S-JTSK cartographic model data corresponding to the map sheets in SHP and DGN8 formats (SHP/DGN8 vector data).


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