赣中丘陵区TM影像的耕地信息提取模型研究

选择赣中临川区2000年9月23日的TM影像作为研究数据源，通过对研究区耕地与各背景地类在7个波段上光谱特征的对比分析，并在DEM数据支持下，找出耕地与背景地类的差异性，排除了如灌木地等各地类的干扰，建立了耕地自动提取专家模型，提取的结果令人满意，经验证，其总面积精度达91．3％，点位精度达82％。本研究表明，可以通过建立自动提取模型，将地块小、受地形影响大、混合像元多的丘陵区耕地提取出来。

Study on the Extraction of Cultivated Land Information from TM Images of the Hill Region in Central JiangXi

In this paper, the studied original data are the TM images of LinChuan region in central JiangXi on September 23rd 2000. The contrasting and analyzing is done on the seven Band of TM images spectral character between cultivated land and other using land types at the studied area. On the basis of above analysis and with the help of the DEM data, the difference between cultivated land and other using land types is found. And the disturbing of other land types such as shrubbery land is removed. Then the automatic extraction knowledge model is set up. The cultivated land can be extracted from among other using land types with the model, but the result is satisfaction. Through checked up the result, the all area accuracy and the points positioning accuracy are as high as 91.3% and 82% respectively. It is showed by this study that the cultivated land of hill area, at where the plot of land is less, the topography effect is larger, the compounding pixels are more, can be extracted with an automatic extraction model.