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《Journal of Geo-Information Science》 2009-06
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Extraction of Volcanic Landform Information Based on DEM Data

ZHOU Zengpo1,2,CHENG Weiming1,ZHOU Chenghu1,ZHANG Hongyan3(1.State Key Laboratory of Resources and Environmental Information System,Institute of Geographic Sciences and Natural Resources Research,CAS,Beijing 100101;2.Graduate School of Chinese Academy of Sciences,Beijing 100049;3.The School of Urban and Environment Sciences,Northeast Normal University,Changchun 130024)  
In this paper,the Longwan volcanic group which locates in the southwest part of Jingyu County,Jilin Province is taken as an example for extracting volcanic landforms information.In the process of extraction,according to the chief feature that the volcanic cones are situated in lava platform,the study area is classified as plain and mountain firstly.Then,the slope data are multiplied by the elevation data,which is similar to weight the elevation in accordance with the relief.It is a way to better highlight the craters in the elevation data on the performance.Taking into account the craters' form characteristics,that is,lower in the intermediate,higher on the surrounding,and their performance on the DEM,a template for craters identification can be established.Finally,the results of the extraction need to be verificated and revised based on remote sensing image.
【Fund】: 国家自然科学基金项目(40871177);; 国家重点实验室基金项目“中国数字地貌空间格局图谱研究”(O88RA304SA)资助
【CateGory Index】: P931
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