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Extracting the Temperate Glacier Information in the Mount Namjagbarwa, Tibet Autonomous Region, Based on ETM~~ Image

ZHANG Ming-hua~{1, 2} (1. Faculty of Earth Sciences, China University of Geosciences, Wuhan Hubei 430074, China.; 2. Department of Resource and Environmental Engineering, Guilin Institute of Technology, Guilin Guangxi 541004, China)  
The high-rank Mêdog highway in Tibet Autonomous Region traverses through the Namjagbarwa region, where there are many temperate glaciers. In order to understand the impact of glaciers on the Mêdog highway, a study is made to analyze and extract spectrum of glaciers with ETM~~ image by mans of remote sensing digital image processing based on image statistics datum. Glacier has a narrow spectrum on TM5, 7 bands, but moraine and snow and ice are different in evidence, therefore, TM5, 7 are advantageous bands for extracting glacier information. The last principal component image, which is brought by K-L transformation with multiple band images, including TM5, 7, is a differential image of both TM5 and TM7, and mainly reflects the glacier information of image. A good result has achieved with the way of image transformation and information separation to extract the glacier information for the Mêdog highway engineering surveying.
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