利用分层分类法进行厦门岛城市地表分类研究

利用分层分类法把厦门岛城市土地类型分为七类，并对分类结果进行了验证．在TM图像光谱特征分析和归一化差异型指数分析结论上，提出分层分类法的分类步骤．利用ERDAS的专家分类器逐类地提取土地类型，并利用掩膜法将原图像上新提取地类所对应区域掩膜掉，使得分类过程越来越容易．分层分类法避免了一次划分多种类别方法在选择波段组合上的矛盾．精度评价结果表明，总分类精度达到90．9％，达到分类要求标准．

Study on Urban Land Classification of Xiamen Island Using Hierarchical Classification Method

The urban land of Xiamen Island is classified into seven categories using the hierarchical classification method,and the classification results are verified.The stages of hierarchical classification method are proposed based on the analysis conclusions of spectral characteristics and normalized difference indexes of TM images.According to the stages,land categories are obtained gradually using expert classifier of ERDAS software,and the region of new land catetory is masked out;so that,the classification process becomes.more and more easy.The hierarchical classification method resolves the discrepancy for choosing bands-combination comparing with single-stage classification methods.The result of accuracy evaluation shows that the overall classification accuracy is 90.9 %,which satisfies the classification accuracy standard.