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《Arid Land Geography》 2006-03
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Relief Amplitude in Junggar Basin and peripheral Northwest Mountains

TANG Fei CHEN Xi CHENG Wei-min 1 Xinjiang Institute of Ecology and Geography,CAS,Urumq 830001,Xinjiang,China; 2 Institute of Geographic Sciences and Natural Resources Research,CAS,Beijing 100101,China; 3 Graduate University of the Chinese Academy of Sciences,Beijing 100039,China  
DEM (digital elevation model) is a powerful tool for landform interpretation, and also an important method to express geomorphology quantitively. With DEM and TM(1990) data of the study area, and using GIS measure plus statistical method based upon comparing several different measures of previous researcher's works, this paper made a series of experiments on the remote sensing satellite images of the target area by changing grid units from 3×3, 4×4,...to 60×60 to observe the correspondingly variation of the relief am- plitude, and made a fitting curve. The results showed that the curve appeared the inflection point at the grid u- nit of 20×20 (4 km~2), which may be called“threshold”. Before the inflection point, the curve rose very rapid- ly, but it grew comparatively much slower after the inflection point; finally it was concluded that the grid unit of 20×20 (4 km~2)is the optimum statistical unit for calculating the relief amplitude in Junggar Basin and the pe- ripheral Northwest Mountains, while DEM data at a scale of 1:250 000. Based upon this conclusion, a Relief Amplitude grade map of the study area has been worked out.
【Fund】: 中国科学院创新工程项目(KZCX-SW-355);; 西部之光人才培养计划(基于遥感技术的荒漠区生态资产评估研究);; 国家973计划项目(2001BC409809)资助
【CateGory Index】: P931
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