Basemap
The basic map is an important basis for the production of accurate, large-scale maps .
It is produced in photogrammetry from aerial photographs with special measuring cameras that photograph the terrain from aircraft vertically downwards.
Most of the basic maps have a scale of 1: 5,000 - so the level of detail lies between a plan and a good hiking map . They are sometimes used directly as an aerial map.
But maps can not reduction to topographical and maps are transformed, but require intermediate steps:
- Terrain representation using layers or contour lines instead of photography
- Artificial lighting of the northwest (instead of the aerial view from the south direction ) by shading
- Signing paths in the forest , widening roads , etc.
- Generalization of localities , narrow valleys, etc.
See also
Web links
- topographic base map on Spektrum.de