The main datasets available are 4 nationwide Digital Surface Models (DSMs) and corresponding Vegetation Height Models (VHMs) with a spatial resolution of 1 m.
The Vegetation Height Models are calculated by subtraction of a Digital Terrain Model (swissAlti3d version 2017, swisstopo) from the generated DSMs. DSMs were derived by image matching of scanned historical images (panchromatic 8-bit) acquired with a RC10 frame camera, in the context of the swisswide image acquisition campaigns of swisstopo.
Nationwide products could be generated for the four epochs
1979-1985 / 1985-1991 / 1990-1998 / 1998-2006.
Additional information about successful image matching vs. interpolation of pixels and about the year of image acquisition are available in the corresponding files (matched_area_xxxx_xxxx_binay.tif and meta_acquisition_year_xxxx_xxxx.json, respectively).
To separate vegetation from non-vegetation areas a mask derived from a combination of information of the Topographic landscape model - TLM (swisstopo) and a NDVI layer was used and is supplied as "TLM_mask.tif"
Due to the occurrence of unrealistic vegetation height values caused by the failure of the image matching process (mainly overexposed images and clouds or very steep rocky terrain), pixel values > 60 m were set to NoData and < 0 m to 0.
All datasets are available in the Reference System LV95 (EPSG: 2056) LN02 (EPSG: 5728) and share the common extent definition (xmin ymin xmax ymax): 2480000 1070000 2840000 1300000