DocumentCode :
1436249
Title :
Merging GPS and Atmospherically Corrected InSAR Data to Map 3-D Terrain Displacement Velocity
Author :
Catalao, Joao ; Nico, G. ; Hanssen, R. ; Catita, C.
Author_Institution :
Inst. Dom Luis, Univ. de Lisboa, Lisbon, Portugal
Volume :
49
Issue :
6
fYear :
2011
fDate :
6/1/2011 12:00:00 AM
Firstpage :
2354
Lastpage :
2360
Abstract :
A method to derive accurate spatially dense maps of 3-D terrain displacement velocity is presented. It is based on the merging of terrain displacement velocities estimated by time series of interferometric synthetic aperture radar (InSAR) data acquired along ascending and descending orbits and repeated GPS measurements. The method uses selected persistent scatterers (PSs) and GPS measurements of the horizontal velocity. An important step of the proposed method is the mitigation of the impact of atmospheric phase delay in InSAR data. It is shown that accurate vertical velocities at PS locations can be retrieved if smooth horizontal velocity variations can be assumed. Furthermore, the mitigation of atmospheric effects reduces the spatial dispersion of vertical velocity estimates resulting in a more spatially regular 3-D velocity map. The proposed methodology is applied to the case study of Azores islands characterized by important tectonic phenomena.
Keywords :
Global Positioning System; data assimilation; displacement measurement; geophysical signal processing; radar interferometry; remote sensing by radar; synthetic aperture radar; tectonics; velocity measurement; 3D terrain displacement velocity mapping; Azores islands; GPS measurements; GPS-InSAR data merging; ascending orbits; atmospheric phase delay effects; atmospherically corrected InSAR data; descending orbits; interferometric synthetic aperture radar; persistent scatterers; tectonic phenomena; time series InSAR data; Atmospheric measurements; Atmospheric modeling; Displacement measurement; Extraterrestrial measurements; Global Positioning System; Merging; Velocity measurement; Atmospheric phase delay; GPS; SAR interferometry (InSAR); synthetic aperture radar (SAR); tectonics;
fLanguage :
English
Journal_Title :
Geoscience and Remote Sensing, IEEE Transactions on
Publisher :
ieee
ISSN :
0196-2892
Type :
jour
DOI :
10.1109/TGRS.2010.2091963
Filename :
5702361
Link To Document :
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