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RADAR INTERFEROMETRY
RADAR INTERFEROMETRY
Date: 28 April 2011, 05:26

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Soon after the first attempts at Delft University of Technology to apply the
radar interferometric technique for the monitoring of subsidence due to gas
extraction in the province of Groningen, the Netherlands, it was recognized by
Usai and Hanssen (1997) that man-made features remained coherent in radar
interferograms over long time spans, while their surrounding was completely
decorrelated. This particular area in the northern part of the Netherlands is
well-known for its subsidence. Due to the slow subsidence rate—the maximum
is approximately 1 cm/y—long temporal baselines needed to be used. Even
though only interferograms with short perpendicular baselines were generated,
temporal decorrelation severely limited the analysis, see (Usai, 1997, 2000;
Usai and Klees, 1999). The Groningen data set was also used by Hanssen
(1998), who analyzed artifacts of atmospheric origin in coherent interferograms
with short temporal baselines. Aside from temporal and geometrical
decorrelation, atmospheric signal is the main problem for the interpretation
of interferometric signal of current day spaceborne sensors on board, e.g.,
ERS, ENVISAT and RADARSAT (Hanssen, 2001).

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