关键词: 遥感图像, 黄土高原水蚀风蚀交错带, 分类, 特征空间, 面向对象分割

Abstract: [Objective] The aim of this research was to acquire land cover thematic information of Hengshan county and to analyze spectrum of land use types based on TM/OLI multispectral remote sensing images in 1990 and 2013. [Method] There were 10 kinds of land use types in the Hengshan county and each land use type were divided into one thematic image layer.Processing sequence was arranged according to extraction difficulty.Next,feature space was built based on characteristic bands,such as NDVI,MNDWI and Albedo.So,general thematic information of land cover was derived using threshold segmentation in feature space.Furtherly,accurate land cover information was achieved by object oriented segmentation,SVM supervised classification and mathematical morphology open-close operator in each thematic image.Finally,overlapping each thematic information image layer together produced classification results.Spectrum of land use types in 1990 and 2013 were obtained in Hengshan county. [Results] Higher accurate classification results were obtained by this new approach.This method increased spectral feature and decreased misjudgment induced by ground objectives.Overall classification accuracy and Kappa coefficient in two periods were 82.31% and 0.775,81.26% and 0.762,respectively. [Conclusion] The thematic information extraction technology noted in this study accurately and rapidly obtained thematic information of land cover in the Heduan country.This provided a new method for TM/OLI images interpretation in the transitional zone of wind-water erosion in the Loess Plateau.

Key words: remote sensing image, transitional zone of wind-water erosion in the Loess Plateau, classification, feature space, object oriented segmentation