TM影像荒漠化解译与成图技术研究

以TM影像为数据源,系统探讨了影像荒漠化信息提取的图像处理与荒漠化土地类型成图的技术方法。将武威市三地区的荒漠化土地类型分为风蚀荒漠化、水蚀荒漠化和中低山草场退化等类型。通过对图像几何和投影系统转换,图像标准假彩色合成,影像空间增强处理,并结合划分的土地利用/覆被类型,建立TM影像目视解译标志,进行荒漠化信息的提取。借助于ARC/INFO软件的不同模块,进行图像判读、编辑制作图形和统计各类荒漠化信息数据。研究表明,武威市荒漠化现象十分严重,三地区共有各类荒漠化土地217.07万hm2,占其总面积的83.33%,其中以民勤县荒漠化土地面积最大。

Study on Interpretation and Cartography Technology of Desertification by TM Image

There are primary desertification types in Wuwei city that are wind erosion, water erosion and grassland retrogress at middle and low mountain. Through geometrical and projection system transform, standard false color composite, spatial enhance to image, link with land use/cover type, establish interpret symbol of TM image, and to extract information of desertification. It use different model piece of ARC/INFO software adequately, to interpret image, and compile and edit map, and statistic all kind of desertification information data. The results showed that desertification is very severe in Wuwei city, and total desertified lands have 217.07hm 2, and occupy 83.33% of total area, among them most is Minqin county.