Digital landscape model
A digital landscape model (DLM) is a numerical model of the landscape. It includes all topographical objects. It usually consists of a two-dimensional situation model and a two-and-a-half -dimensional terrain model (DTM).
The ATKIS -DLM is actually just a digital situation model. The terrain is only modeled in the form of floor plan information. The ATKIS-DGM is created independently from the DLM and is therefore not consistent with the landscape model.
The digital landscape model with the highest level of detail is the scale-less basic DLM. In it, the landscape is systematically structured according to property types and associated descriptive information. In the context of the model accuracy, it is complete, true to length and not cartographically generalized. The content of the basic DLM is based on the topographic map 1: 25000 and is specified in an object catalog. The German basic map 1: 5,000 (in the old federal states ), the topographic map 1: 10,000, state output ( new federal states ), orthophotos 1: 5,000 and photogrammetric stereo image evaluations serve as the geometric basis for recording . The basic DLM, which is created in several stages of implementation, is geometrically based on a linear basic structure of the landscape in the form of streets, paths, railways, bodies of water and borders with an accuracy of at least three meters. The areal proportions of the landscape - residential areas, industrial and commercial areas, grassland, forest, etc. a. - are recorded and described over a large area according to their use.
In a third implementation stage, this database is continuously updated and expanded to include additional property types.
The application possibilities of the basic DLM are diverse. The data are z. B. used:
- to set up specialist information systems,
- for positioning and navigation ,
- for the production of digital and analog topographic maps ,
- for spatial information systems and
- to support marketing tasks.
- DLM 50 (1: 50,000)
- DLM 250 (1: 250,000)
- DLM 1000 (1: 1,000,000)