THE METHOD STUDY OF ANTARCTIC ICE SHEET SNOWMELT DETECTION FROM MICROWAVE RADIOMETER MEASUREMENTS

摘要

The detecting and monitoring of snowmelt is important for studying global changes in polar regions and for hydrological modelling of snowmelt-runoff in high-latitude and mountainous regions. The most of snowmelting detection methods were developed based on in situ measurement, so, the applicable area of the methods are limited and the operational of the methods is not robust. From this problems, two methods which independent of in situ measurements were proposed: the unsupervised XPGR snowmelt detection method based on generanized Gaussian model and the modified snowmelt detection method based on wavelet transformation edge detection. Through cross comprarison of two methods, the result indicate that two mthods were not only increased the computation efficiency, practicability and operability due to independent of in situ measurement, but also improved the ice sheet snowmelt detection accuracy to some extent. The propsed methods provided the methodology support for Antarctic ice sheet snowmelt detection.