Abstract
The Great Wall is the symbol of China,and it is one of the greatest structures during human history.The Great Wall information is analyzed and extracted using high spatial resolution data SPOT-5 and DEM data.Firstly,light linear object is extracted using differential geometrical method based on SPOT-5 data,then the ridge is extracted using GIS method based on DEM data,and a buffer about ten meters is built around the ridge.Finally the linear object and the buffer is analyzed using GIS method,and the Great Wall information is extracted.Through precision evaluation,it is indicated that the result is satisfying.
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