Position: Home > Articles > Accuracy Assessment of Topography Information Extracted from TanDEM-X Data by SAR Interferometry
Forest Inventory and Planning
2017,42
(1)
1-6+50
TanDEM-X数据干涉地形信息精度分析
作 者：
刘琦;章皖秋;岳彩荣;王宗梅;谈启龙
单 位：
西南林业大学林学院
关键词：
TerraSAR-X/TanDEN-X;数字高程模型(DEM);干涉SAR;地形信息;精度分析
摘 要：
以德国宇航中心TanDEM-X数据为信息源,采用干涉技术提取植被覆盖区的地形,将相关系数、山脊线与山谷—水系线作为评价指标,对比5种地形数据(数字化DEM、SRTM–DEM、ASTER GDEM、TanDEM-X Monostatic-DEM,TanDEM-X Bistatic-DEM)在地表起伏表达方面的差异。研究结果显示,数字化DEM精度高,但是获取方式费时费力;SRTM-DEM能表现宏观地形,但分辨率低;ASTER GDEM分辨率有所提升,但是对地形的表达精度偏低;TanDEM-X干涉地形数据分辨率高,但是在林区受到森林冠层高度影响,实为数字表面模型,无法提供准确可靠的林下地形信息。
译 名：
Accuracy Assessment of Topography Information Extracted from TanDEM-X Data by SAR Interferometry
作 者：
LIU Qi;ZHANG Wanqiu;YUE Cairong;WANG Zongmei;TAN Qilong;Forestry College,Southwest Forestry University;
关键词：
TerraSAR-X/TanDEM-X;;digital elevation model;;SAR Interferometry;;topographic information;;precision analysis
摘 要：
By applying SAR Interferometry and selecting TanDEM-X data provided by DLR as data source,DEM in forest area was extracted. This study took correlation coefficients,ridge and valley lines as evaluation index,and compared the performance of presenting local topography in five DEMs( Digitalized DEM,SRTM-DEM,ASTER GDEM,TanDEM-X Monostatic-DEM and TanDEM-X Bistatic-DEM). The results showed that Digitalized DEM had the best accuracy,but hard to collect; SRTM-DEM performed well on macro-topography,but spatial resolution was low; ASTER GDEM had a better spatial resolution,but the accuracy on presenting the topography was low. Results also found that the topography extracted from TanDEM-X data had a high spatial resolution,but the TanDEM-X SAR Interferometry actually was Digital Surface Model not Digital Elevation Model for the impact of forest canopy height,which cannot provide reliable underlying forest Topography Information.
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