Geological map of Lower Saxony 1 : 25 000 - Basic map
Description
The Geological Map of Lower Saxony 1 : 25 000 (GK25) provides information on the distribution, nature and sequence of rocks to a depth of two metres below surface. In the case of solid rocks, conclusions can usually be drawn about the continuation of these rock sequences into greater depths.
In the map image and the associated area descriptions, stratigraphy (ageing) and genesis (type of origin) are displayed and described for each geological unit. Furthermore, the area descriptions contain information on the petrography main mixture and secondary mixture (the nature of the rocks) as well as on the lime and humus content of the individual layers. All units shown and numbered in the map image are abbreviated to the symbol key geology (PREUSS et al. 1991) is explained.
The presentation of the geological facts in the base map is subject to certain rules. Rocks at the surface of the terrain of at least 2 meters thickness are characterized by surface colors, overlapping cases of several layers with beam hatching. Horizontal beam hatchings indicate layer sequences that consist exclusively of loose rocks, diagonally arranged beam hatchings refer to loose rock layers over solid rocks. Wide hatches refer to the rocks on the surface of the terrain; underlying layers are characterized by a thinner hatching. Surface colors as well as colors of the hatchings characterize the respective rock type. In order to clarify the natural geological conditions, the original distribution of the rocks is shown in areas with intensive development, although this may be changed by anthropogenic measures (e.g. landfilling).
The GK 25 is available in two machining stations with different accuracy: either as a detailed map (special map) or as an overview map (manuscript map).
The overview maps on a scale of 1: 25 000 (sheet section of TK25) were allocated for the preparation of the Geological Overview Map 1 : 200 000 (GÜK 200) and are already largely generalized for the target scale of the GÜK 200. The processing was carried out with relatively little time (usually a few weeks to months), so that the surface resolution is rather low.
As a rule, the individual GK25s are not compared with the neighbouring leaves at the edge of the leaf. This can lead to so-called "leaf edge faults". The main reasons for this are the different times at which the individual geological maps were created (e.g. a sheet in 1929, the neighboring sheet only in 1985) and that detailed and overview maps are located on neighboring leaf areas, so that no comparison at the leaf edge is possible due to the different processing intensity.
A revision of all geological maps is currently not possible for this scale level.
Resources
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https://nibis.lbeg.de/net3/public/ogc.ashx?NodeId=202&Service=WFS&Request=GetCapabilities& |
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https://nibis.lbeg.de/net3/public/ogc.ashx?NodeId=202&Service=WMS&Request=GetCapabilities& |