PSI-HSR: A new approach for representing persistent scatterer interferometry (PSI) point targets using the hue and saturation scale

  • Lu P
  • Casagli N
  • Catani F
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Persistent Scatterer Interferometry (PSI) is a recently developed
radar processing technique that enables the measurement of ground
motion with millimetre accuracy. This technique makes use of an analysis
of multi-temporal Synthetic Aperture Radar (SAR) images to detect
stable PSI point targets, so-called persistent scatterers (PSs).
These PSs are usually integrated in a geographic information system
(GIS) as a standard point-based map, using colour coding on their
velocities, with separation of ascending and descending data. In
this paper we introduce the PSI-HSR (PSI Hue?Saturation Representation),
a new method for representing PSI point targets using the hue?saturation
scale. The aim was to render a unique colour for each PSI point target,
based on a combination of displacements assessed along two different
lines of sight. PSI-HSR provides a straightforward way to describe
ground movement. To demonstrate the usefulness of this approach,
an example of detecting ground subsidence in the Pistoia-Prato-Firenze
basin is presented.

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  • Ping Lu

  • Nicola Casagli

  • Filippo Catani

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