Cartometry
As Kartometrie the measurement and transmission (mapping) geometrical parameters (distances, areas, angles) on thematic and topographical maps referred to.
In a broader sense, cartometry can relate to geometric dimensions ( colors , shapes and line structures such as terrain edges or embankments ). From cartograms are - in the presence of an appropriate scale bar - statistical data removed.
For length measurement along curved serving or curved lines Curvimeter (or curve diameter) or the dividers , for directions of a kartometrischer protractor or directly in the terrain and the compass . The direct extraction of numbers printed on the map (e.g. sea depths ), on the other hand, is not part of cartometry, nor is the free-eyed estimation of routes or directions, for example during orienteering .
With a planimeter , areas can be measured directly in maps by driving around the searched area with the measuring wheel. Often, terrain data such as exposure and slope inclination are not determined on site, but cartometrically.
The measuring accuracy of straight sections is 0.1 to 0.2 mm. However, the actual accuracy of the measurement also depends on the degree of generalization of the map, which increases at small scales . Exact cartometry is usually only possible on bodies of water, churches, building signatures and elevation or TP points, while railway lines can be shifted by about 0.5 mm and roads by up to 1 mm.
See also
literature
- Viktor Heissler, Günter Hake: Cartography, Volume I , 4th edition. De Gruyter, Göschen Collection Volume 30a / 30b, Berlin 1970
- Walter Großmann, Heribert Kahmen: Surveying III , 12th edition. De Gruyter, Göschen Collection Volume 2162, Berlin 1988