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dhm25

Technical Details

Model Forms

Basis Model (left) and Matrix Model (right) of DHM25
Basis Model (left) and Matrix Model (right) of DHM25

DHM25 - Basis Model

Digitised height information of the 1:25 000 map, with following elements:

linear elements

  • Digitised contour lines
  • Digitised lake contours
  • Main breaklines in the Alps


points 

  • Digitised spot heights and lake ground spots
     

formats of delivery 

  • DXF
  • ArcView Shapefiles

DHM25 - Matrix Model

The height matrix with 25 m grid is interpolated from the basis model. An enlarged grid of 200 m is also available.

formats of delivery

  •  ArcInfo ASCII Grid Format
  • coordinate list with X, Y, Z
  • DXF  POLYFACE: Ordering in Toposhop is not possible. Can only be ordered by email to geodata@swisstopo.ch. On orders in this format an additonal handling fee of SFr.50.- is charged.

Coordinate system

LV03 LN02 

Accuracy

The DHM25 has been derived from the National Map 1:25 000 and reflects basically its accuracy. Comparisions of "model heights" with photogrammetric measurements show an average error of 1.5 m for the Central Plateau and the Jura, 2 m for the Pre-Alps and the Ticino and 3-8 m for the Alps. 

Documents

Further publications concerning the height models are available only in German and French. Please select your preferred language in the navigation bar, to view the desired document.

Sample Data

The sample data show their type and format. They are free of charge and can be used for test purposes only. It is not allowed to include them in a product.