INSPIRE NI Altitude - Grid Coverage DGM1
Description
The DGM describes the terrain surface by the spatial coordinates of a representative set of terrain points. Height information is thus kept independent of scale and in line with data processing. Based on the 3D measurement data from airborne laser scanning (ALS) available throughout Lower Saxony since 2019, a high-precision DGM1 (grid width 1 m) is provided. In order to meet the requirements and needs of different applications, the LGLN additionally provides DGM5, DGM10, DGM25 and DGM50 in different grid widths. The DGM data are positionally determined in the ETRS89/UTM coordinate system, the height refers to the DHHN2016 with normal height zero (NHN). The DGM is continued on the basis of stereoscopic image evaluation. It is currently carried out exclusively on an ad hoc basis and on an ad hoc basis in an update cycle of 3 years. In the future, it is planned to include 3D structural information such as rupture edges and striking terrain points in the generation of the DGM.
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Tags
- advmis
- inspireidentifiziert
- gdimrh