Abstract
SUMMARYThe purpose of this study was to measure the reflective properties of different snow types and to use these data in the analysis of LANDSAT MSS imagery of snow to predict water run-off. The radiometer measurements were collected using a LANDSAT MSS-compatible EXOTECH 100 radiometer from three different test areas in the Swiss Alps under various illumination/viewing conditions and for different target sizes (slope and aspect). Measurements were made both on the ground and from a helicopter.The results show that snow is approximately a Lambertian reflector for the investigated illumination/viewing situation (sun zenith angle: 24°–49°; viewing nadir angle: 0°–30°; phase angle: 21°–62°; slope: 0°–30°; aspect: 0°–360° for slopes up to 20°) which is significant for the pertinent radiometer measurements. It was not possible to distinguish the six snow types. However, fresh snow (sticky snow, slush) has a distinctly higher reflectance factor in the four radiometer bands than does old snow (spring snow, bri...
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