Evaluating the effect of the observation time on the distribution of SAR Permanent Scatterers
Alessandro Ferretti(1) and Fabio Rocca(2)
Tele-Rilevamento Europa -T.R.E. S.r.l.,
Via V. Colonna, 7,
(2) Politecnico di Milano, Via Ponzio, 34/5, 20133 Milano, Italy
A first assessment of the effect of the observation time on the
distribution and density of SAR Permanent Scatterers will be presented.
A first PS analysis has been carried out using 26 ERS-1 SAR (Track: 22,
Frame: 2763, Mode: descending) images acquired over Roma and Frascati
(Italy) in the 4 months time span (end of December 1993 – mid April
1994) during operation phase D (3 days revisiting time).
The results will be compared with the output of a 35 days revisiting
time PS analysis, covering the 5 years time span 1995-1999. This second
data set will be formed selecting 26 ERS-1/2 out of the available 55
(Track: 79, Frame: 2763, Mode: descending), to get very similar
acquisition parameters (especially the normal baseline distribution)
for the two data set.
The difference of PS distribution and location will be analyzed with
the help of high resolution optical imagery aiming at identifying
targets behaving as PS only in short temporal intervals.
The conclusions of this analysis:
- will contribute to the knowledge of the physical nature of SAR
- should also provide useful hints to plan future SAR mission dedicated
to InSAR applications, in particular the monitoring of individual
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,