基于RS和GIS的彭州市震毁土地信息提取及分析
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摘要
以"5·12"地震前后的TM影像为数据源,根据研究区特殊的地貌特征和灾毁分布特征,采用分区处理的方法,提取了地震前后彭州市土地利用图。彭州市灾毁面积达200.53km2,占彭州市总面积的14%。提出以R(4)G(2)B(7)波段组合的影像图来区分河流与灾毁,可以大大提高灾毁提取的精度与速度。将灾毁信息与高程数据、坡度数据、坡向数据进行叠加分析,得出:灾毁与高程成正相关;随着坡度的增加,灾毁比例先增后减,灾毁最严重的坡度为35°～55°;西—西南向灾毁比例相对较高,东—东南向灾毁比例较低。
Basing on TM images,according to the special topographical features and distribution characteristics of the disaster in study area,this paper divided research areas into several parts,extracted land-use maps of Pengzhou city before and after'5·12'earthquake by zoning processing method.The disaster area of Pengzhou city is 200.53km2,occupying 14%of the total area.Images with R(4)G(2)B(7)band combination for distinguishing rivers and disaster,can greatly improve the speed and accuracy of extracting disaster.Overlay analysis disaster information with elevation data,gradient data,and aspect data showed that the reationship between disaster and elevation was positive correlation,disaster percentage first increased and then decreased.Along with the increase of slope,the most serious disasters happened on the slope of 35°～55°.West-southwest disaster percentage was relative higher,and that of east-southeast was the lowest.
Basing on TM images,according to the special topographical features and distribution characteristics of the disaster in study area,this paper divided research areas into several parts,extracted land-use maps of Pengzhou city before and after'5·12'earthquake by zoning processing method.The disaster area of Pengzhou city is 200.53km2,occupying 14%of the total area.Images with R(4)G(2)B(7)band combination for distinguishing rivers and disaster,can greatly improve the speed and accuracy of extracting disaster.Overlay analysis disaster information with elevation data,gradient data,and aspect data showed that the reationship between disaster and elevation was positive correlation,disaster percentage first increased and then decreased.Along with the increase of slope,the most serious disasters happened on the slope of 35°～55°.West-southwest disaster percentage was relative higher,and that of east-southeast was the lowest.
引文
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[4]王运生,罗永红,吉峰,等.汶川大地震山地灾害发育的控制因素分析[J].工程地质学报,2008,16(6):759-763.
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[6]白世彪,间国年,盛业华.基于GIS的长江三峡库区滑坡影响因子分析[J].山地学报,2005,12(3):63-70.
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