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借助遥感数据和ＧＩＳ软件，对内蒙古高原东南缘森林草原过渡带进行研究，利用１９９２—１９９３年间１２个月份的ＮＤＶＩ资料，分析研究区的ＮＤＶＩ分布格局。同时，通过主成分分析方法，对数据进行降维，提取前两个主分量，其中第一主分量代表ＮＤＶＩ的累计，第二主分量代表ＮＤＶＩ的年内变动程度。结果表明，由荒漠化草原带到森林带，在其第一主分量逐步增加的同时，第二主分量也随着增加。最后，再利用上述所得的两个主分量对研究区进行监督分类，分类结果较为满意。
Based on the remote sensing data and GIS software, the transitional zone of foreststep in the southeastern margin of Inner Mongolia Plateau was studied, and the NDVI data of 12 months in 1992-1993 were used to analyze the NDVI distribution in the study area. At the same time, the principal component analysis method is used to reduce the dimensionality of the data and extract the first two principal components, where the first principal component represents the cumulative NDVI and the second principal component represents the degree of NDVI variation over the year. The results show that the second principal component increases with the increase of the first principal component from the desert steppe to the forest belt. Finally, the two principal components obtained above are used to supervise and classify the study area, and the classification results are satisfactory.