The Basic Topographic Map of the Czech Republic 1 : 100 000 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 100/ETRS89, is a fundamental state cartographic work. As of July 1, 2023, ZTM 100/ETRS89 extends the series of state cartographic works with the ZTM 100 variant in the ETRS89-TMzn plane coordinate system, serving as an alternative to ZTM 100 in the national S-JTSK coordinate system. In terms of content, ZTM 100/ETRS89 is identical to the primary ZTM 100/S-JTSK. ZTM 100/ETRS89 depicts the entire territory of the Czech Republic in a continuous layout of map sheets, with the territory represented on 66 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 depending on the map scale. A ZTM 100/ETRS89 map sheet thus covers an area of 20′ × 40′ (latitude × longitude). The dimensions do not include ancillary elements shown on the printed version of the map sheet (e.g., overlap strip, frame, and non-frame data). The dimensions of the printed map including all frame and non-frame data are 480 mm × 770 mm. TIFF raster tiles measure 411 mm × 522 mm and, besides covering the area of the respective map sheet, also include the overlap strip into neighboring sheets.
ZTM 100/ETRS89 map sheets are labeled with an alphanumeric nomenclature based on the International Map of the World 1 : 1,000,000 (for the Czech Republic NM-33 and NM-34) with dimensions of 6° longitude × 4° latitude. Additional characters specify the position of the map sheet of a given scale within the larger 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 present on the sheet. If no settlement is present, another unique geographic name (peak, watercourse, land parcel) from the sheet is used. ZTM 100/ETRS89 map sheets are created by dividing a ZTM 250/ETRS89 sheet into 3 rows of 20′ latitude and 3 columns of 40′ longitude, resulting in 9 map sheets, which are labeled sequentially within the ZTM 250/ETRS89 sheet from the northwest corner with numbers 1 to 9. An example of a map sheet designation is NM-33-08-6 Jihlava.
ZTM 100/ETRS89 contains planimetric, altimetric, and descriptive data. Planimetric data includes settlements and significant economic and cultural structures, roads, water bodies, administrative boundaries, large protected area boundaries, vegetation, and land cover. Altimetric data represents terrain relief with contours at a basic interval of 20 meters, terrain steps, rock formations, and surveyed points with specified elevation. Descriptive data consists of standardized geographic names, names of municipalities and their parts, contour and point elevations, names of protected areas. Printed map sheets and map content data files in PDF format also include the ETRS89-TMzn and S-JTSK kilometer grid, the ETRS89 geographic grid, the map frame with frame data (e.g., description of neighboring countries and affected protected areas and orographic units, 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 boundaries, graphical depiction of elevation on the map sheet in the form of color hypsometry, etc.).
The map content is depicted only within the territory of the Czech Republic. For planimetric representation in ZTM 100, 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), geometric generalization (displacement, simplification of shapes, and merging areas), and reclassification (grouping multiple element categories into one category).
The processing of ZTM 100/ETRS89 data began in 2020, and full coverage of the Czech Republic was completed in May 2023. The map is produced by transforming ZTM 100/S-JTSK data, followed by data verification and supplementation of frame and non-frame data. Source data for ZTM 100/S-JTSK are 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 100/ETRS89 is managed by the Czech Office for Surveying, Mapping and Cadastre, which publishes ZTM 100/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).

The product data files are provided in selected formats via ATOM download services as open data, free of charge, under the license Creative Commons CC BY 4.0.
 
Another option for data distribution is exporting data extracts in the Geoprohlížeč application.
 
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