摘要：A method to derive the snow line elevation using
NOAA-AVHRR satellite data in combination with
a digital elevation model is presented. The AVHRR
sensor enables the frequent Observation of snow cover
with a sufficiently high temporal resolution.
The definition of the snow line and the impact of geocoding
errors, as well as errors due to misclassification,
are discussed. A comparison of the NOAA-AVHRR
data with data from the higher resolution IRS-WiFS
indicates that even at a spatial resolution of 1.1 km, a
quantitative analysis of the snow line elevation is possible.
The influence of different winter conditions in Switzerland on the elevation of the snow line is reflected in
satellite data from 1990,1996 and 1999. The results of
the investigation were, firstly the presentation of the
spatial pattern of the average snow line elevation, secondly
the derivation of snow line signatures for three
regions. These were then compared with the Overall
alpine snow line signature.
