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本文利用ＴＭ波段比值开展了专题信息的计算机自动提取工作，提出了两种新方法─—定向变换法和逻辑取与法。在南方亚热带植被覆盖的火山岩区进行了试验。结果表明，所提出的方法能消除植被和其他地物的干扰，有效地提取出与金、银等多金属有关的矿化蚀变信息，效果良好。同时，在南方红盆区油气显示信息的提取和直接寻找油气藏方面，用波段比值逻辑取与法也取得良好效果。新方法是实用的，有广阔的应用前景。
In this paper, we use the TM band ratio to carry out the computer automatic extraction of thematic information, and propose two new methods ─ directional transformation method and logical sum method. In the southern subtropical vegetation covered volcanic areas were tested. The results show that the proposed method can eliminate the disturbance of vegetation and other features and effectively extract the mineralized alteration information related to polymetallic gold, silver and other metals with good effect. At the same time, the extraction of oil and gas in the Red Basin of the South China Sea and the direct search for oil and gas reservoirs also achieved good results with the method of band-ratio logic. The new method is practical, has broad application prospects.