On the Effect of Interferometric Pairs Selection for Measuring Fast Moving Landslides
Résumé
The systematic availability of data from the Copernicus Sentinel-1 mission, allows redundancy of pairs considered during interferometric processing. In the present work the effect of DInSAR pairs' selection on the interferometric estimates, especially for the case of relatively fast moving landslides, is investigated. Interferometric findings over a well-monitored site are validated by in-situ geodetic measurements. It was documented that significant underestimation of motion occurs for DInSAR solutions utilizing pairs covering larger temporal spans, while displacement patterns are generally maintained. The above fact is attributed mainly to the magnitude of cumulated motion at temporally long interferograms, exceeding the physical limit of SAR interferometric techniques, with pronounced underestimation issues introduced. The need for an a priori knowledge of the expected motion rates for the optimum selection of interferometric combinations for measuring ground displacements is underlined.
Mots clés
Synthetic aperture radar
Interferometry
Terrain factors
Motion measurement
Displacement measurement
Satellites
Extraterrestrial measurements
geomorphology
geophysical techniques
radar interferometry
remote sensing by radar
synthetic aperture radar
interferometric pairs selection
Copernicus Sentinel-1 mission
interferometric processing
DInSAR pairs
interferometric estimates
relatively fast moving landslides
well-monitored site
in-situ geodetic measurements
DInSAR solutions
displacement patterns
cumulated motion
temporally long interferograms
SAR interferometric techniques
expected motion rates
optimum selection
interferometric combinations
Copernicus Sentinel-1
DinSAR
Interferometric pairs
Landslides
Fast motion