Accuracy Improvement of ASTER Stereo Satellite Generated DEM Using Texture Filter  

作　　者：Mandla V.Ravibabu Kamal Jain Surendra Pal Singh Naga Jyothi Meeniga 

机构地区：[1]Center for GIS,School of Geography and Environmental Science,Monash University,Clayton Campus,VIC,Australia [2]Environmental,Water Resource and Transportation Engineering Division,School of Mechanical & Building Science,Vellore Institute of Technology(VIT)-University Vellore-632 014,Tamil Nadu,India [3]Geomatics Engineering Section,Department of Civil Engineering,Indian Institute of Technology Roorkee,Roorkee-247667,U.A.,India [4]Post Graduate Student(GST),Institute of Science and Technology,JNTU,Hyderabad,India

出　　处：《Geo-Spatial Information Science》2010年第4期257-262,共6页地球空间信息科学学报（英文）

基　　金：Supported by the Ministry of Human Resource Development (MHRD),India (for Distinguished Institute Fellow)

摘　　要：The grid DEM(digital elevation model) generation can be from any of a number of sources:for instance,analogue to digital conversion of contour maps followed by application of the TIN model,or direct elevation point modelling via digital photogrammetry applied to airborne images or satellite images.Currently,apart from the deployment of point-clouds from LiDAR data acquisition,the generally favoured approach refers to applications of digital photogrammetry.One of the most important steps in such deployment is the stereo matching process for conjugation point(pixel) establishment:very difficult in modelling any homogenous areas like water cover or forest canopied areas due to the lack of distinct spatial features.As a result,application of automated procedures is sure to generate erroneous elevation values.In this paper,we present and apply a method for improving the quality of stereo DEMs generated via utilization of an entropy texture filter.The filter was applied for extraction of homogenous areas before stereo matching so that a statistical texture filter could then be applied for removing anomalous evaluation values prior to interpolation and accuracy assessment via deployment of a spatial correlation technique.For exemplification,we used a stereo pair of ASTER 1B images.The grid DEM （digital elevation model） generation can be from any of a number of sources： for instance, analogue to digital conversion of contour maps followed by application of the TIN model, or direct elevation point modelling via digital photo- grammetry applied to airborne images or satellite images. Currently, apart from the deployment of point-clouds from LiDAR data acquisition, the generally favoured approach refers to applications of digital photogrammetry. One of the most important steps in such deployment is the stereo matching process for conjugation point （pixel） establishment： very difficult in modelling any homogenous areas like water cover or forest canopied areas due to the lack of distinct spatial features. As a result, application of automated procedures is sure to generate erroneous elevation values. In this paper, we present and apply a method for improving the quality of stereo DEMs generated via utilization of an entropy texture filter. The filter was applied for extraction of homogenous areas before stereo matching so that a statistical texture filter could then be applied for removing anomalous evaluation values prior to interpolation and accuracy assessment via deployment of a spatial correlation technique. For exemplification, we used a stereo pair of ASTER 1B images.

关 键 词：ASTER digital elevation model extraction stereo matching texture filter quality improvement 

分 类 号：V474[航空宇航科学与技术—飞行器设计]