利用NDVI-Albedo反演厦门后溪流域地表特征

利用TM影像与6S模型反演获得精确NDVI与Albedo数据,在NDVI-Albedo散点图空间综合分析了后溪流域的植被和地表反照率空间分布特征。后溪流域整体上植被丰富,土壤湿度大,裸地少,并且流域内南北地表特征变化显著,北部山区以自然地表为主,南部平原以建设用地人工地表为主。南北地表类型差异在NDVI-Albedo空间中表现直观,利用NDVI-Albedo作为指示因子,在流域内的山区平原衔接部位设置13条样带,结合小波分析的方法,将后溪流域南北划分,确定出一条长12.26 km的地表分界线。此分界线代表南北不同地表类型,反映不同的城镇化水平与人类活动强度,为流域因地制宜分区管理提供了基础数据与依据。

Analysis of the Spatio Distribution of the Surface NDVI-Albedo Features in Houxi Watershed Using TM Image

We obtained the accurate NDVI and Albedo images using TM image and 6S model.The spatial features of surface NDVI and Albedo were analyzed in Houxi watershed.The result is that the vegetation is rich,soil humidity is high,and bare land is less in Houxi watershed.The north surface features are different from the south,and the difference is obvious in NDVI-Albedo scatter plot.The most of north region is hills and mountain,and nature surface is dominated.The most of south region is plain,and artificial surface is dominated.We set 13 sample lines between hills and plain and used NDVI and Albedo as factors through wavelet analysis method to determine the surface boundary in Houxi watershed.The length of the surface boundary is 12.26 km,and the boundary divides the Houxi watershed into two parts.The two parts represent different surface types and reflect the different urbanization level and different intensity of human activity.The spatial analysis of NDVI-Albedo and the surface boundary provide the foundational data and theory basis for the study of Houxi watershed.