Historical Vegetation Height Model NFI

Description

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

Resources

Name Format Description Link
0 https://www.envidat.ch/dataset/historical-vegetation-height-model-nfi/resource/ab378272-33a5-46b2-b5fa-ebba527e589b
0 https://www.envidat.ch/dataset/historical-vegetation-height-model-nfi/resource/f5010edb-3425-4912-83f6-7a1c99c56693
0 https://www.envidat.ch/dataset/historical-vegetation-height-model-nfi/resource/127ab853-24e2-459f-ac0b-f4d90279c72b
0 https://www.envidat.ch/dataset/historical-vegetation-height-model-nfi/resource/335dde9a-e4be-4959-ae33-9bdb8fc4b027
74 https://www.envidat.ch/dataset/historical-vegetation-height-model-nfi/resource/f6cabeaa-bf7c-4141-bea9-af99d3224487
0 https://www.envidat.ch/dataset/historical-vegetation-height-model-nfi/resource/127ab853-24e2-459f-ac0b-f4d90279c72b
0 https://www.envidat.ch/dataset/historical-vegetation-height-model-nfi/resource/f5010edb-3425-4912-83f6-7a1c99c56693
0 https://www.envidat.ch/dataset/historical-vegetation-height-model-nfi/resource/335dde9a-e4be-4959-ae33-9bdb8fc4b027
74 https://www.envidat.ch/dataset/historical-vegetation-height-model-nfi/resource/f6cabeaa-bf7c-4141-bea9-af99d3224487
0 https://www.envidat.ch/dataset/historical-vegetation-height-model-nfi/resource/ab378272-33a5-46b2-b5fa-ebba527e589b

Tags

  • vhm
  • photogrammetry
  • forest
  • nfi
  • historical
  • dsm

Topics

  • EDUC

Categories