资源三号立体数据云区域DEM修正方法研究

Study of Correction Method on DEM of Cloudy Area from Stereopair of Satellite ZY-3

针对有云的资源三号立体数据生成的DEM存在的问题进行了分析,提出了DEM的修正方法。首先,利用面向对象图像分割的原理,建立规则提取云区域,并形成云区域矢量文件;然后,利用提取的云区域裁剪外部参考DEM,得到云区域修正的DEM值,并利用栅格运算替换资源三号原DEM中云区域的值;最后,得到研究区无云区域的修正DEM。并利用湖北咸宁地区资源三号立体数据和30 m ASTG DEM数据进行了实验验证,实验证明,本文方法可以有效地去除云区域的错误DEM值,为后期应用提供更可靠的DEM数据。

Aiming at the problem exist in the generation generation of DEM of the stereopair of satellite ZY - 3 with cloud is analyzed, a DEM corrected method is proposed. First of all, using the principle of object -oriented image segmentation, cloud region with rule extraction were established, and the vector file in the cloud region were formed; First of all, using the principle of object - oriented image segmentation, cloud region with rule extraction were established, and the vector file in the cloud region were formed; finally, the modified DEM with cloudless region in the study area were obtained. The experimental verification of the stereopair of satellite ZY - 3 and the data of ASTG DEM with 30 meters in Xianning area of Hubei is carried out. Experimental results showed that the method proposed can effectively remove the error DEM value in the cloud area, provide more reliable DEM data for the later application.