基于地形因子的草地遥感分类方法的研究

研究表明,ETM影像的3、5、7波段综合反映草地植被信息,可用于草地植被类型的划分。草地类型的分布具有一定的生态序列性,跟坡度、坡向、高程等地形因子具有一定的联系,利用数字高程模型可以提取一系列的原生或次生地形属性,协助研究草地类型的梯度分布规律。辅助地形因子进行草地遥感的分类有其独特优势,可将易混淆草地型区分出来,提高草地遥感分类的精度,为解决同物异谱、异物同物现象提出了一个有效的解决方法。

Study on the remote sensing classification of grasslands based on the topographic factors

Results showed that the 3,5,7 bands of ETM image reflected the information of the grassland vegetation, which could act as the resource for grassland classification. The distribution of grassland types had some ecological sequence, and was related to the slope, aspect and elevation. The DEM can provide a series of original or secondary terrain attributes, help study the rule of the distribution of grassland vegetation. The remote sensing classification assisted with topographic factors had its predominance, which could improve the precision of the classification, and provide effective solutions to the problem that the same matter had different spectra or the different matter had same spectra.