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Mapping of Snow Cover in the Swiss Alps from ERTS-1 Imagery

H. Haefner, R. Gfeller and K. Seidel
COSPAR XVIth PLENARY MEETING and RELATED SYMPOSIA
June 1973

Abstract

A semi-automated mapping system was developed by combining the possibilities of a Quantimet 720 for the individual discrimination of the critical density level in each image with the advantage of high resolution photographic techniques for the execution of the density slicing. The visually determined density level on the monitor is used as reference time to expose a lith-film. The snow cover will be transferred onto a special topographical map 1 : 5001000, but for this procedure SCC-imagery is necessary. Investigations were undertaken on the accuracy of the areal measurements in the different MSS-bands. The results show that image-series with an old and melting snow cover differ greatly in the reproduced areas, whilst image-series taken shortly after a new snowfall produce more or less the same results. This opens a possibility for a further characterization of the surface of the snow cover by using all four bands in combination. For areal measurements of the snow band 5 is auggested. Additional investigations are necessary to achieve a sufficient accuracy and to overcome the problems of geometric as well as photometric distortions.


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@InProceedings{eth_biwi_01173,
  author = {H. Haefner and R. Gfeller and K. Seidel},
  title = {Mapping of Snow Cover in the Swiss Alps from ERTS-1 Imagery},
  booktitle = {COSPAR XVIth PLENARY MEETING and RELATED SYMPOSIA},
  year = {1973},
  month = {June},
  volume = {Symposia A},
  keywords = {}
}