Základní topografická mapa České republiky 1 : 50 000 v S-JTSK

The Base Topographic Map of the Czech Republic 1:50 000 in the plane coordinate system of the Cadastral Trigonometric Network (S-JTSK), hereinafter referred to as ZTM 50/S-JTSK, is a fundamental national map series. ZTM 50/S-JTSK replaces the Base Map of the Czech Republic 1:50 000 (ZM 50) from 1 July 2023. ZTM 50/S-JTSK covers the entire territory of the Czech Republic in a continuous map layout; the territory of the Czech Republic is shown on 202 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 50/S-JTSK map sheet thus covers an area of 25 km × 25 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 × 770 mm. ZTM 50/S-JTSK map sheets are identified by a nomenclature of alphanumeric character, which specifies the position of the ZTM 50/S-JTSK map sheet within the map sheet of the smaller scale from which it is derived. The map sheets are further supplemented by a map sheet name, which is generally identical to the name of the largest settlement on the given map sheet. If no settlement is found on a map sheet, another unique geographical name (peak, watercourse, land tract) from that map 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, designated consecutively within the ZTM 100/S-JTSK map sheet in rows from the north-west corner as A, B, C, D. An example of a map sheet designation is Žďár nad Sázavou 0506-D. ZTM 50/S-JTSK contains planimetry, altimetry and descriptions. The planimetry includes settlements and significant economic and cultural objects, roads, hydrography, boundaries of administrative units and cadastre 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 10 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, names and codes of cadastre units and territorial-technical units, contour line elevations and points with given elevation, names of 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. directional data for selected roads, names of settlements divided between cadastre units, descriptions of neighbouring states, coordinates) and non-frame data (e.g. map legend, imprint data, graphical, numerical and slope diagram, interpolation scale of the ETRS89 geographical grid, graphical representation of the map in the map layout, expression of meridian convergence and magnetic declination, graphical representation of the overview of administrative boundaries, graphical representation of the terrain relief on the map sheet in the form of colour hypsometry, etc.). Only features occurring within the territory of the Czech Republic are shown. When displaying planimetry in ZTM 50, 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).