分段线性拉伸法在土地利用调查中的应用研究  

Application of Piecewise Linear Stretch Based on the Analysis of the Object Spectrum in Landuse Change Survey

作　　者：冯秀丽[1] 王珂[2] 曾初晓[3] 

机构地区：[1]宁波大学建筑工程与环境学院,浙江宁波315211 [2]浙江大学农业遥感信息技术应用研究所,杭州310029 [3]宁波市国土资源局东钱湖旅游度假区分局,浙江宁波315121

出　　处：《科技通报》2008年第4期531-534,共4页Bulletin of Science and Technology

基　　金：浙江省科技厅科技计划项目(2004C33089)

摘　　要：通过目视解译方式,利用SPOT5数据进行土地利用调查,地类光谱的可区分性在很大程度上决定着应用的精度水平。实验以浙江省桐乡市龙翔街道SPOT5影像为例,以土地利用变更调查为目的,通过针对土地利用类型的光谱分析,提出了基于地类光谱特性分析的分段线性拉伸方法;同时利用同期航测数据,对应用效果做了定量分析。结果表明:采用此方法,对于光谱接近易混淆的地类,不仅可以增强地类界限清晰度,而且地类面积提取精度也可提高3.5%左右。Discernability of object spectrum affects the precision of the application based on the visual interpretation method in landuse change survey with SPOT5 image. One case study was taken in Longxiang section of Tongxiang city of Zhejiang province in this paper. Piecewise linear stretch was applied according to the spectral analysis of land use types with the statistics methods. Based on the data derived from contemporary aerial survey as true references, the quantum analysis was performed at the same time. The results indicated that the effect of piecewise linear stretch based on the analysis of the object spectrum was obvious. The image with dramatic spectral difference was produced for interpretation. The spectral difference enhancement for similar objects leaded discernability improvement for different land use type combinations, which was helpful to extract land use information and improve the precision of area. The precision for area can be increased about 4%.

关 键 词：地类光谱 分段线性拉伸法 土地利用变更调查 SPOT5 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置]