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Open AccessArticle

DEM Generation With a Scale Factor Using Multi-Aspect SAR Imagery Applying Radargrammetry

by Shanshan Feng 1,2,3, Yun Lin 4,*, Yanping Wang 4, Yanhui Yang 5, Wenjie Shen 1,2,3, Fei Teng 1,2,3 and Wen Hong 1,2,3
1
Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100190, China
2
Key Laboratory of Technology in Geo-spatial Information Processing and Application System, Chinese Academy of Sciences, Beijing 100190, China
3
University of Chinese Academy of Sciences, Beijing 101408, China
4
School of Electronic and Information Engineering, North China University of Technology, Beijing 100144, China
5
Beijing Institute of Remote Sensing Equipment, Beijing 100854, China
*
Author to whom correspondence should be addressed.
Remote Sens. 2020, 12(3), 556; https://doi.org/10.3390/rs12030556
Received: 6 January 2020 / Revised: 30 January 2020 / Accepted: 5 February 2020 / Published: 7 February 2020
(This article belongs to the Special Issue Airborne SAR: Data Processing, Calibration and Applications)
Digital elevation model (DEM) generation using multi-aspect synthetic aperture radar (SAR) imagery applying radargrammetry has become a hotspot. The traditional radargrammetric method is to solve the rigorous radar projection equations to obtain the three dimensional coordinates of targets. In this paper, we propose a new DEM generation method based on the offset between multi-aspect images formed on ground plane. The ground object will be projected to different positions from different viewing aspect angles if the height of object is not equal to the height of imaging plane. The linear relationship between the offset of imaging positions and height of the object is derived and scale factor is obtained finally. Height information can be retrieved from offset of imaging positions directly through the DEM extraction model presented in this paper. Thus the solution to nonlinear equations point by point can be avoided. Real C band airborne circular SAR images is used to verify the proposed approach. When extracted DEM applied in multi-aspect imaging process, superimposition of multi-aspect images will no longer be defocusing and can achieve finer observation of the scanned scene. View Full-Text
Keywords: digital elevation model (DEM); synthetic aperture radar (SAR); multi-aspect SAR imagery; offset; height difference; scale factor digital elevation model (DEM); synthetic aperture radar (SAR); multi-aspect SAR imagery; offset; height difference; scale factor
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Feng, S.; Lin, Y.; Wang, Y.; Yang, Y.; Shen, W.; Teng, F.; Hong, W. DEM Generation With a Scale Factor Using Multi-Aspect SAR Imagery Applying Radargrammetry. Remote Sens. 2020, 12, 556.

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