Reflectances of glaciers as calculated using Landsat-5 Thematic Mapper data
1988; Elsevier BV; Volume: 25; Issue: 3 Linguagem: Inglês
10.1016/0034-4257(88)90107-1
ISSN1879-0704
AutoresDorothy K. Hall, A. T. C. Chang, H. Siddalingaiah,
Tópico(s)Arctic and Antarctic ice dynamics
ResumoLandsat-5 Thematic Mapper (TM) data have been used in previous work in order to locate zones of similar spectral reflectance on glaciers in Austria and Alaska and to relate these zones to the glacier facies which are indicative of glacier mass balance. In this paper Landsat-5 digital numbers (DNs) have been used to compute the at-satellite planetary reflectances ϱp on spectrally similar zones on the Meares and Schwanda glaciers in Alaska and the Grossglockner glacier group in Austria. The patterns of TM-derived reflectances in the ablation areas of the Grossglockner glacier group and the Meares Glacier compare favorably with published reflectance curves measured on the surface of glacier ice, though the surface reflectance of snow-covered ice is higher than the Landsat-derived reflectance for the glaciers studied. The accuracy of the at-satellite planetary reflectances is shown to be affected by topographic and atmospheric effects and by the anisotropic nature of snow reflectance. Use of reflectance values for analysis of snow and ice facilitates scene-to-scene comparisons of glaciers.
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