Základní topografická mapa České republiky 1 : 250 000 v S-JTSK

The Base Topographic Map of the Czech Republic 1:250 000 in the plane coordinate system of the Cadastral Trigonometric Network (S-JTSK), hereinafter referred to as ZTM 250/S-JTSK, is a fundamental national map series. ZTM 250/S-JTSK replaces the Base Map of the Czech Republic 1:200 000 (ZM 200) from 1 July 2023. ZTM 250/S-JTSK covers the entire territory of the Czech Republic in a continuous map layout; the territory of the Czech Republic is shown on 12 map sheets. The sheet lines of the layout (inner frames) of the ZTM/S-JTSK map sheets form rectangles whose sides are parallel to the S-JTSK coordinate axes and are 500 mm long in the direction of the Y axis and 400 mm long in the direction of the X axis at the scale of the respective map. A ZTM 250/S-JTSK map sheet thus covers an area of 125 km × 100 km. The dimensions do not include the accompanying elements shown on the printed version of the map sheet (i.e. the boundary band and frame and non-frame data). The dimensions of the printed map including all frame and non-frame data are 480 mm × 700 mm. ZTM 250/S-JTSK map sheets are identified by a nomenclature of numerical character based on the numbering of rows and columns of map sheets. The map sheets are further supplemented by a map sheet name, which corresponds to the name of the largest settlement on the given map sheet. ZTM 250/S-JTSK map sheets are identified by a row and column number, where the northernmost row is designated 1 (followed by 2, 3, 4 towards the south) and the westernmost column is designated 1 (followed by 2, 3, 4 towards the east). An example of a map sheet designation is 23 Hradec Králové. ZTM 250/S-JTSK contains planimetry, altimetry and descriptions. The planimetry includes settlements, roads, hydrography, boundaries of administrative units, boundaries of Protected Landscape Areas, vegetation and land surface. The altimetry includes terrain relief shown by contour lines with a basic contour interval of 50 metres, terrain steps, rock features and points with given elevation including their altitude. The map description consists of standardised geographical nomenclature, names of municipalities and parts of municipalities, contour line elevations and points with given elevation, names of districts and protected areas. The printed map sheets also contain the S-JTSK and ETRS89-TMzn one-kilometre map grid and the ETRS89 geographical grid, a map frame with frame data (e.g. descriptions of neighbouring states, affected Protected Landscape Areas and orographic units, coordinates) and non-frame data (e.g. map legend, imprint data, graphical, numerical and gradient scale, interpolation scale of the ETRS89 geographical grid, graphical representation of the map in the map layout, expression of meridian convergence and magnetic declination, etc.). The content of the map is shown only within the territory of the Czech Republic. When displaying planimetry in ZTM 250, methods of cartographic generalization are applied to ensure graphical clarity — census choice of map elements and normative choice of map elements (omission of elements based on quantitative and qualitative parameters and further reduction of the number of elements where applicable), geometrical generalization (displacement, simplification of shapes and merging of areas) and reclassification (grouping of multiple categories of elements into a single category).