利用1996年和1986年秋季陆地卫星TM数据,将计算机监督分类与非监督分类识别方法结合应用进行草地的解译,改进算法,改善遥感图像的识别精度。试验研究结果表明:吉林省西部草原生态环境在恶化,草地面积平均每年减少4.5×10⁴hm²,草地退化严重,退化草地面积已占草地总面积的81.1%,而且退化程度也在加重,中、重度退化草地比例明显提高,草地退化呈发展的趋势。

Grasslands had been revised with the method combined supervised and non-supervised classifications using Landsat data in autumn of 1996 and 1986. The advanced algorithm was used to improve the accuracy. The result shows that first, the grassland environment in the West Jilin is worsening and the area is decreasing by an average of 4.5?10⁴ hectares a year; second, the grassland degeneration is sharpening and the degeneration area is 81.1% of the total. The degeneration becomes heavier, and the middle and heavy degenerated grasslands are developing in higher proportion.