As official card one by a public institution (is official , authority ) in public functions published map called. Official cards are used for public services and security and are often based on a law or regulation. They are either edited and produced by the issuing institution itself or produced on their behalf by a private cartography company .
Typical official cards include:
- Property maps ( land maps, cadastral maps); at a scale of 1: 500 to 1: 5000, they show the property boundaries and the names of the parcels and, as part of the real estate cadastre, are (official) maps within the meaning of the land register regulations.
- Topographic maps ; they represent the terrain as well as manifestations and facts on the surface of the earth on a scale of 1: 5000 to 1: 1 million and are issued by the state surveying authorities ( state surveying office , federal agency for cartography and geodesy , in Austria federal surveying service ).
- The official map 1: 5000 (AK5) represents the interface between the automated real estate map (ALK) and the medium-scale topographic national maps from the scale 1: 25000. It is derived from the vector data of the ALK, supplemented with data from the ATKIS and for the Presentation on a scale of 1: 5000. In Lower Saxony, it is the successor product of the German basic map 1: 5000 (DGK5).
- Geoscientific maps ; They represent spatial geoscientific results and findings, for example in geological maps, hydrogeological maps, soil maps and maps of deposits and are published by the geological services of the federal states and the Federal Institute for Geosciences and Raw Materials , among others .
- Nautical charts ; they represent deep sea and coastal waters and in particular the fairways with depth information and obstacles and the nautical navigation facilities and are published by the Federal Maritime and Hydrographic Agency .
Using map construction programs and computer-aided presentation and visualization techniques, official maps in analog or digital form are now often derived from corresponding databases. Intermediate products in the form of graphically oriented vector data and image-oriented raster data are created in a production chain from object-structured data , before the analog map is output on the screen, printing plate or paper. It is currently controversial whether only the analog end product, an intermediate product or even the initial database has the property of an official card. The working group of the surveying administrations of the federal states of the Federal Republic of Germany (AdV), for example, has given the spatial information systems AFIS , ALKIS and ATKIS the official attribute , which is expressed in the A of the respective acronym.