The Basic Topographic Map of the Czech Republic 1 : 10 000 in the plane 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 10/ETRS89, is a fundamental state cartographic work. As of July 1, 2023, ZTM 10/ETRS89 expands the series of state cartographic works with a variant of ZTM 10 in the plane coordinate system ETRS89-TMzn, providing an alternative to ZTM 10 in the national coordinate system S-JTSK. In terms of content, ZTM 10/ETRS89 does not differ from the primary ZTM 10/S-JTSK. ZTM 10/ETRS89 depicts the entire territory of the Czech Republic in a continuous layout of map sheets, with the territory of the Czech Republic represented on 4,695 map sheets.
The sectional lines of the layout (inner frames) of ZTM/ETRS89 map sheets are formed by images of meridians and parallels at intervals determined by the map scale. A ZTM 10/ETRS89 map sheet thus covers an area of 2′ × 4′ (latitude × longitude). The dimensions do not include ancillary elements displayed on the printed version of the map sheet (e.g., overlap strip and frame and non-frame data). The dimensions of the printed version of the map, including all frame and non-frame data, are 480 mm × 770 mm. TIFF raster tiles measure 411 mm × 522 mm and, in addition to the area of the corresponding map sheet, also cover the overlap strip to adjacent sheets.
ZTM 10/ETRS89 map sheets are labeled with an alphanumeric nomenclature derived from the designation of the International Map of the World 1 : 1,000,000 (for the Czech Republic NM-33 and NM-34), measuring 6 degrees of longitude and 4 degrees of latitude. Additional characters specify the position of the map sheet of a given scale within the smaller-scale map sheet from which it is derived. Map sheets are also supplemented with the name of the map sheet, usually corresponding to the largest settlement on the sheet; for ZTM 5/ETRS89, ZTM 10/ETRS89, and ZTM 25/ETRS89, this corresponds to the name of the respective ZTM 50/ETRS89. If no settlement is present on the map sheet, another unique geographic name (peak, watercourse, land parcel) from the sheet is used. ZTM 10/ETRS89 map sheets are created by dividing a ZTM 50/ETRS89 sheet into 5 rows of 2 minutes latitude and 5 columns of 4 minutes longitude into 25 map sheets, which are numbered sequentially within the ZTM 50/ETRS89 sheet from the northwest sheet with numbers 01 to 25. An example of a map sheet designation is Žďár nad Sázavou NM-33-08-6-B-20.
ZTM 10/ETRS89 contains planimetric, altimetric, and descriptive data. The planimetric data includes settlements and individual structures, roads, water bodies, administrative and cadastral boundaries, protected area boundaries, points of the geodetic and gravimetric network, vegetation, and land cover. The altimetric data covers terrain relief represented by contours with a basic interval of 2 meters, terrain steps, rock formations, ravines, landslides or debris, isolated rocks and boulders, groups and rows of stones, and surveyed points with specified elevation. The descriptive data consists of standardized geographic names, names of municipalities and their parts, object type designations, street and public space names, elevations and point numbers of geodetic networks, contour and surveyed point elevations, names of protected areas. The printed map sheets and data files with the map print base in PDF format also include the ETRS89-TMzn and S-JTSK kilometer grid and ETRS89 geographic grid, map frame with frame data (e.g., directional information of selected roads, names of twin settlements, description of neighboring countries, coordinates) and non-frame data (e.g., legend, imprint information, graphical, numerical, and slope scale, interpolation scale of the ETRS89 coordinate system grid, graphical representation of the map in the layout of map sheets, meridian convergence and magnetic declination, graphical representation of administrative and cadastral boundaries and protected area boundaries, etc.).
The map content is depicted only within the territory of the Czech Republic. For planimetric representation in ZTM 10/ETRS89, cartographic generalization methods are applied to ensure graphical clarity – censal and normative selection (omission of elements based on quantitative and qualitative parameters, or further reduction) and geometric generalization (displacement, simplification of shapes), cartographic displacement, or enlargement of small dimensions. The level of generalization in ZTM 10/ETRS89 is such that individual buildings are not extensively merged into blocks. The map thus provides a very detailed representation of the mapped area.
The processing of ZTM 10/ETRS89 data began in 2020, and full coverage of the Czech Republic was completed in May 2023. The map is produced by transforming ZTM 10/S-JTSK data, followed by data verification and supplementation of frame and non-frame data. Source data for ZTM 10/S-JTSK include the Basic Geographic Database of the Czech Republic (ZABAGED^®) and the Geographic Names Database of the Czech Republic Geonames.
The creation and updating of ZTM 10/ETRS89 is managed by the Czech Office for Surveying, Mapping and Cadastre, which publishes ZTM 10/ETRS89 data free of charge as open data in the form of map content data files including non-frame data corresponding to map sheets in PDF format (print PDF files) and georeferenced map content data files corresponding to map sheets in TIFF format (TIFF raster tiles).

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