基于植被指数-反照率特征空间的沙漠化信息遥感提取——以张掖绿洲及其附近区域为例Extracting desertification from landsat imagery using a feature space composed of vegetation index and albedo——a case study of Zhangye oasis and its adjacent areas
潘竟虎,秦晓娟
摘要(Abstract):
利用Landsat TM遥感卫星影像反演植被指数和地表反照率,并由此构建了植被指数和地表反照率组成的特征空间,最后利用该特征空间对张掖绿洲及其附近区域的沙漠化现状和程度进行了定量评价。利用野外调查的定位数据对结果进行检验,总体精度达到82%。该方法可以在遥感图像处理软件下实现沙漠化现状与程度的自动识别,而且指标简单、易于获取。与单纯使用遥感光谱信息进行分类相比,对于沙漠化现状与程度的分类和分级具有更好的效果。
关键词(KeyWords): 沙漠化;遥感;特征空间;NDVI;反照率
基金项目(Foundation): 国家自然科学基金项目(40671061);; 甘肃省自然科学基金项目(0710RJZA104);; 西北师范大学知识与科技创新工程项目(NWNU-KJCXGC-03-20)
作者(Author): 潘竟虎,秦晓娟
DOI: 10.16251/j.cnki.1009-2307.2010.03.036
参考文献(References):
- [1]王涛,朱震达.我国沙漠化研究的若干问题——沙漠化的概念及其内涵[J].中国沙漠,2002,23(3).
- [2]刘同海,吴新宏,董永平,等.沙漠化遥感信息研究综述J].遥感技术与应用,2004,19(6).
- [3]Wang Jian,LiWenjun.Primary Study on the MultilayerRemote Sensing Information Extraction of DesertificationLand Types by Using Decision Tree Technology[C]//International Geosciense and Remote Sensing Symposi-um.Institute of Electrical and Electronics EngineersInc,2002:2513-2515.
- [4]Hansen MC,DeFries R S,Townshend J R G.Towardsan Operational MODIS Continuous Field of Percent TreeCover Algorithm:Examples Using AVHRR and MODISData[J].Remote Sensing of Environment,2002,83.
- [5]Alfredo D C,Emilio C,CamarasawA.Satellite RemoteSensing Analysis to Monitor Desertification Processes inthe Cro Prangeland Boundary of Argentina[J].Journalof Arid Environments,2002,52.
- [6]马金辉,蔡迪花,肖桐.鄂尔多斯地区沙漠化遥感定量评价[J].兰州大学学报(自然科学版),2007,43(4).
- [7]李胜功,Harazono Y,何宗颖,等.奈曼荒漠化对草地微气象特征影响的研究[J].大气科学,1994,18(6).
- [8]Li S,et al.Grassland desertification by grazing and the re-sulting micrometeorological changes in Inner Mongolia[J].Agricultural and Forest Meteorology,2000,102(2).
- [9]曾永年,等.Albedo-NDVI特征空间及沙漠化遥感监测指数研究[J].地理科学,2006,26(1).
- [10]Liang S.Narrowband to broadband conversions of landsurface albedo:algorithms[J].Remote Sensing ofEnvironment,2001,76(2).
- [11]Verstraete M,Pinty B.Designing optimal spectral inde-xes for remote sensing applications[J].Remote Sens-ing of Environment,1996,34(5).