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《Remote Sensing for Land & Resources》 2009-03
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RESEARCHES ON THE DIGITAL ELEVATION MODEL EXTRACTION METHOD BASED ON ALOS PALSAR DATA

NI Wen-jian1,2,GUO Zhi-feng1,SUN Guo-qing3(1.Institute of Remote Sensing Application,Chinese Academy of Science,Beijing 100101,China;2.Graduate School of Chinese Acadermy of Science,Beijing 100049,China;3.Department of Geography,University of Maryland,College Park,MD 20742,USA)  
In the past decades,researchers have successfully rebuilt the digital elevation model(DEM) using such Interferometric synthetic aperture radar data(InSAR) as SIR-C/X SAR and ERS1/2.As a new generation of synthetic aperture radar,Phased Array type L-band Synthetic Aperture Radar(PALSAR),which is onboard Advanced Land Observing Satellite(ALOS),works at a longer wave length-L band.Its penetrating depth is deeper than the radars that work at C band.Thus it has advantages in the construction of DEM.However,there have been few reports about the DEM extraction from this technology.The open source program-package ROI_PAC version3.0 provided by NASA/JPL can be used to rebuild DEM from PALSAR Level 1.0 data that is not calibrated.Therefore,ROI_PAC version 3.0 was modified in this study to make it rebuild DEM from PALSAR Level 1.1 data.The workflow of ROI_PAC was described.The method introduced in this paper was validated by a set of PALSAR Level 1.1 data.A comparison between InSAR DEM and reference DEM was made.The difference between them is 0.27 m,with a standard deviation of 9.24 m.There are more than 80% pixels having height errors within 10 m.The results show that the method proposed in this study is useful.
【CateGory Index】: TP72
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