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Differential interferometry
 Differential
interferometry involves taking at least two images (with addition of DEM), normally
three images, of the same ground area. Passes 1 and 2 are used to form an interferogramme
of the terrain topography using the basic interferometric technique. Similarly,
passes 2 and 3 produce a further interferogramme of the same area.
The two interferogrammes are then themselves differenced to reveal any changes
that have occured in the Earth's surface. Such changes could be the result of
shifting geological faults or the buckling of the surface due to volcanic activity.
In principle, the ERS SAR is sensitive to changes of the Earth's surface topography
on a scale comparable to the radar wavelength, i.e. 5.6 cmm
Keywords: ESA European
Space Agency - Agence spatiale europeenne,
observation de la terre, earth observation,
satellite remote sensing,
teledetection, geophysique, altimetrie, radar,
chimique atmospherique, geophysics, altimetry, radar,
atmospheric chemistry
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EO Data Access
Differential
interferometry involves taking at least two images (with addition of DEM), normally
three images, of the same ground area. Passes 1 and 2 are used to form an interferogramme
of the terrain topography using the basic interferometric technique. Similarly,
passes 2 and 3 produce a further interferogramme of the same area.