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首先对含有7个多光谱波段的TM图像分别做了主成分、缨帽变换。然后在对遥感数据及其派生数据分析的基础上,得出可见光、近红外波段之一和第三主成分及绿度特征。做RGB彩色合成能够较好地揭示干旱区盐渍化土壤信息,此方法处理的效果受表层土壤含水量的影响。最后对合成图像分类,得出研究区盐渍地的数量和空间分布状况。
Firstly, the TM images containing seven multi-spectral bands were respectively transformed into principal component and tasseled cap. Then based on the analysis of remote sensing data and its derived data, one of the visible and near infrared bands and the third principal component and greenness characteristics are obtained. Doing RGB color synthesis can reveal the salinized soil information in arid areas better. The effect of this method is affected by the soil moisture content of the surface layer. Finally, the synthetic images are classified to obtain the quantity and spatial distribution of salted land in the study area.