Historical Topographic Map 1:25000 Lower Saxony (HTK25)

The oldest sheets of the Historical Topographic Map 1: 25 000 (HTK25) are created for today’s Lower Saxony region in 1878 and are created and edited by the Prussian State Reception, Berlin. For the processing room, the maps are available in 1912. In 1921, the Reichsamt für Landesaufnahme, Berlin, succeeded the Prussian state reception. In 1938, the HTK25 came under the responsibility of the Hauptvermessungsabteilung VII. Production and publication took over in 1948 by the Lower Saxony State Survey Office, in 1958 the Lower Saxony State Administration Office — Land Surveying and 1997 the Land Survey and Geobase Information Lower Saxony (since 01.01. 2011 Division 4 of LGLN). The map sheets show the object types settlements, supply and disposal, traffic, vegetation, waters, relief and borders. The objects and their symbols are shown in the sample sheets of the topographic map 1: 25,000 predetermined. The usually monochrome leaves become three-coloured at the end of the 1960s (ground plan black, waters blue, height lines brown). From 1979 onwards, there will be a 4. Color (forest cover green). The originally manually created map graphics, beginning in 2000, will be replaced by a new digitally derived map graphics. This is in the ATKIS® signature catalogue of the Digital Topographic Map 1: 25 000 (DTK25). The object types can be found in the object type catalog of the DTK25. The map content is made from the ATKIS® base DLM, the ATKIS®-DGM and the Property data derived from ALKIS®. In addition to the geographical coordinates, the Gauss-Krüger coordinate system is introduced in the editions of the HTK25 in 1923. With the ATKIS® outputs (from 2000 onwards), the UTM coordinate grid is added. Between 1945 and 1990, the HTK25, including the eastern border sheets, comprises a number of 425 sheets. With the emergence of ATKIS® editions, there are still 408. An end-to-end number designation of the card sheets, consisting of four digits and an identical sheet cut of all editions, facilitates comparative work within the HTK25. The most recent editions of the HTK25 are from 2008. The sheets of the HTK25 are offered as a dataset or as a plot from the database in up to 15 editions. Records with old map graphics were created by scanning the analog sheets (300 dpi). Those with new map graphics are mainly derived from the print files (500 dpi)