Title :
A method for the automatic characterization of InSAR atmospheric artifacts by correlation of multiple interferograms over the same site
Author :
Sarti, F. ; Vadon, H. ; Massonnet, D.
Author_Institution :
CNES, Toulouse, France
Abstract :
Theoretically SAR interferometry allows for the extraction of very precise digital elevation models (DEM) with a potential accuracy of a few meters (3 m rms or better for ERS), as well as for the determination of ground displacements with a centimeter level accuracy in the case of differential interferometry. In practice, the presence of atmospheric fringes limits the confidence in the results. Varying atmospheric conditions between the two acquisitions induce a path difference generating InSAR artifacts that cannot be corrected if only one interferogram is available. However, if an interferometric triplet (three interferometric pairs based on three different radar acquisitions over the same site) can be formed, the atmospheric artifacts related to each date can be characterized by correlation, the objective being to subsequently filter them out
Keywords :
geodesy; geophysical techniques; radar imaging; remote sensing by radar; synthetic aperture radar; terrain mapping; topography (Earth); DEM; InSAR; SAR interferometry; atmospheric artifact; atmospheric fringe; automatic characterization; differential interferometry; digital elevation model; geodesy; geophysical measurement technique; interferometric SAR; interferometric triplet; land surface topography; multiple interferogram; radiowave propagation; synthetic aperture radar; terrain mapping; Atmospheric measurements; Computer aided software engineering; Displacement measurement; Frequency; Layout; Meteorology; Surfaces; Synthetic aperture radar interferometry; Testing; Time measurement;
Conference_Titel :
Geoscience and Remote Sensing Symposium, 1999. IGARSS '99 Proceedings. IEEE 1999 International
Conference_Location :
Hamburg
Print_ISBN :
0-7803-5207-6
DOI :
10.1109/IGARSS.1999.774992
