Average coherence image derived observations over an urban area: the case of Athens city

I. Parcharidis; M. Foumelis; P. Kourkouli

doi:10.1117/12.737820

29 October 2007 Average coherence image derived observations over an urban area: the case of Athens city

I. Parcharidis, M. Foumelis, P. Kourkouli

Proceedings Volume 6749, Remote Sensing for Environmental Monitoring, GIS Applications, and Geology VII; 67492Q (2007) https://doi.org/10.1117/12.737820
Event: SPIE Remote Sensing, 2007, Florence, Italy

Abstract

In the present study coherence observations, in relation to the land-cover type, obtained using 20 C-band ERS SAR Single Look Complex (SLC) VV-polarization images acquired in descending mode over the metropolitan area of Athens covering the period 1992-1999 are presented. A straightforward approach using a single master SAR image on which the other images are mapped was adopted ensuring perfect registration of the interferometric results. After generating single coherence images, with temporal separation varying between 138 and 1335 days, an averaging procedure followed leading to the average coherence image. In order to identify and statistically interpret the properties of selected land cover types in terms of average degree of coherence, very high resolution QuickBird imagery was downloaded from Google Earth environment. The final geocoding of the average coherence image has been improved using common features in the coherence image and the very high-resolution QuickBird image. Overlay of coherence product on the QuickBird image allows correlating the level of coherence with characteristics and properties of the urban shell. As urban areas are considered of high coherence, observations of this type permit to investigate and evaluate their phase stability in details.

Citation Download Citation

I. Parcharidis, M. Foumelis, and P. Kourkouli "Average coherence image derived observations over an urban area: the case of Athens city", Proc. SPIE 6749, Remote Sensing for Environmental Monitoring, GIS Applications, and Geology VII, 67492Q (29 October 2007); https://doi.org/10.1117/12.737820

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KEYWORDS

Coherence (optics)

Synthetic aperture radar

Vegetation

Interferometry

Image processing

Image registration

Image resolution

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