摘要
岩溶石漠化是我国当前面临的三大生态灾害之一,以基岩裸露为主要表现特征的土地退化现象突出,岩石裸露率是评价石漠化的关键指标之一。本文选择滇东南地区广南县为研究区,构建归一化岩石指数(NDRI),引入像元二分模型法,提出了基于NDRI像元二分模型提取岩石裸露率,依据岩石裸露率与石漠化相关关系,得到了研究区石漠化面积及其分布状况。根据野外调查结果,对石漠化信息提取结果进行了精度验证,利用短波红外(TM7)与近红外(TM4)波段得到的结果远优于利用中红外(TM5)与红光(TM3)波段得到的结果,为相似岩溶区石漠化信息提取提供了参考。
Karst rocky desertification is one of the three major ecological disasters currently. Bare rock is the main per- formance characteristics of land degradation and the bare rock ratio is one of the key evaluation indexes of rocky desertifica- tion. In this study, selected Guangnan County as the studying area in southeast Yunnan, built the normalized differential rocky index （NDRI）, introduced the dimidiate pixel model, proposed the method of extracting bare rocky ratio based on NDRI dimidiate pixel model, and according the relationship between bare rocky ratio and rocky desertification, obtained the distribution of rocky desertification in study area. According to the results of field survey, verified the accuracy of rocky de- sertification extracting results, based on TM7 and TM4, the obtained results was far superior compared with that of TM5 and TM3, rocky desertification extraction method provided a reference in similar karst region.
出处
《新技术新工艺》
2014年第1期72-75,共4页
New Technology & New Process
基金
国家自然科学基金资助项目(41261092
71163023)
关键词
石漠化
岩石裸露率
9-2-化岩石指数
像元二分模型
rocky desertification, bare rocky ratio, the normalized differential rocky index, dimidiate pixel model
