High Resolution SAR Interferometry: influence of local topography in the context of glacier monitoring
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24 juillet 2006
- ISIDORE Id: 10670/1.17a947...
- halshs: halshs-00264815
info:eu-repo/semantics/OpenAccess
Mots-clés
synthetic aperture radar (InSAR) interferometry temperateglacier velocity field digital terrain model(DTM)Sujets proches
Natural science Sciences Science of science Pictorial data processing Picture processing Processing, ImageCiter ce document
Gabriel Vasile et al., « High Resolution SAR Interferometry: influence of local topography in the context of glacier monitoring », HAL SHS (Sciences de l’Homme et de la Société), ID : 10670/1.17a947...
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Résumé
SAR interferometric data offers the opportunity to measure temperate glacier surface topography and displacement between the two acquisitions. Recently, reliable estimates of the phase gradient given by interferogram local frequencies become mandatory with the increase of the SAR resolution. In this paper, an original 2-step method for estimating local frequencies is proposed. The 2D phase signal is considered to have two deterministic components corresponding to low-resolution fringes and high-resolution patterns due for instance to the micro-relief. The first step of the proposed algorithm consists in the low-resolution phase flattening. In the second step the local high-resolution frequencies are estimated from the phase auto-correlation functions computed on adaptive neighborhoods using only the pixels which belong to the same HR spatial feature and respect the ”local stationarity” hypothesis. Results with both real ERS 1/2 tandem and simulated TerraSAR-X interferograms are presented to illustrate the potential of the proposed method.
