Table 1: Glacier measurements from air photos 1969 and landsat images 1972 and 1973


Autoria(s): Rott, Helmut
Cobertura

MEDIAN LATITUDE: 46.929755 * MEDIAN LONGITUDE: 11.107604 * SOUTH-BOUND LATITUDE: 46.761000 * WEST-BOUND LONGITUDE: 10.719000 * NORTH-BOUND LATITUDE: 47.956000 * EAST-BOUND LONGITUDE: 11.883000 * MINIMUM ELEVATION: 2790 m a.s.l. * MAXIMUM ELEVATION: 3350 m a.s.l.

Data(s)

03/12/1976

Resumo

The extent of snow cover at the end of the ablation season on glaciers in the Tyrolean Alps in 1972 and 1973 was determined from Landsat-1 Multispectral Scanner (MSS) images. For snovv mapping the MSS-images with a ground resolution of 80 meters were enlarged to a scale of 1: 100.000 by photographic methods. Different appearance of snow cover in the 4 MSS-channels is discussed in connection with ground truth control. The accuracy of snow and ice mapping from Landsat images was checked on 15 glaciers with an area from 1 to 10 km2 by aerial photography and/or ground truth control. These comparisons imply the usefulness of Landsat images for snow mapping on glaciers of a few square kilometers. The altitude of the equilibrium line was determined from Landsat images for 53 glaciers in the Tyrolean Alps. The regional differences in the equilibrium line altitude correspond to the regional precipitation patterns. The equilibrium line was identical with the snow line at the end of the budget year 1971/1972; therefore it was possible to determine the equilibrium line from satellite images. For 1968/69 the equilibrium line was mapped from aerial photographs for several glaciers. In 1972/73 mass balance was strongly negative and the equilibrimn line was within the firn area of the glaciers. Therefore it was not possible to distinguish between accumulation and ablation areas from the Landsat images of September 1973; however, snow and ice areas could be olearly differentiated. The ratios of accumulation area 01' snow area to the total area of the glaciers were determineel from satellite images and aerial photography separately for aelvancing anel for retreating glaciers and were relateel to the mass balance. In the budget years 1968/69 and 1972/73 with negative mass balance the accumulation area ratios of the advancing glacien; were olearly different from the ratios of the retreating glaciers, in 1971/72 with positive 01' balanced mass budget the differences between advancing and retreating glaciers were not significant.

Formato

text/tab-separated-values, 635 data points

Identificador

https://doi.pangaea.de/10.1594/PANGAEA.803307

doi:10.1594/PANGAEA.803307

Idioma(s)

en

Publicador

PANGAEA

Direitos

CC-BY: Creative Commons Attribution 3.0 Unported

Access constraints: unrestricted

Fonte

Supplement to: Rott, Helmut (1976): Analyse der Schneeflächen auf Gletschern der tiroler Zentralalpen aus Landsat-Bildern. Zeitschrift für Gletscherkunde und Glazialgeologie, 12(1), 1-28, hdl:10013/epic.40233.d001

Palavras-Chave #Area/locality; Area in square kilometer; Calculated; Comment; ELEVATION; Event label; Exposition; LATITUDE; Location of event; LONGITUDE; Number; ÖtztalAlps; Ötztaler Alpen, Central Alps, Austria; Ratio; Sea level, relativ; StubaiAlps; Stubaier Alpen, Eastern Alps, Austria; Zillertaler Alpen, Eastern Alps, Austria; ZillertAlps
Tipo

Dataset