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Usbekistan

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Snowmelt Runoff Forecasting

Image Processing and Classification

The preprocessed satellite data are imported into the ERDAS Imagine software package. Firstly, the data are ortho-rectified using an elevation model and, secondly, time series of snow cover maps are derived during the ablation (snowmelt) period. The snow cover maps are then transferred to the GIS for further spatial and temporal analyses. The figures below show the ortho-rectification process using ground control points (GCP) and a digital elevation model (DEM). Arrows connect corresponding GCPs. Because of specific image distortions, the arrows have different lengths and inclinations.


The figure below represents a snow cover map for 15 May 2001 (snow=blue)

 
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