SHORT PERIOD CHANGE DETECTION OF SPERCHIOS LOWER DELTA AREA USING SPACE RADAR IMAGES

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Published: Jul 23, 2018
DOI: https://doi.org/10.12681/bgsg.16893
Em. Psomiadis
Minerology-Geology laboratory, Agricultural University of Athens
G. Migiros
Minerology-Geology laboratory, Agricultural University of Athens
Is. Parcharidis
Space Applications Research Unit in Geosciences, Laboratory of Geophysics, National and Kapodistrian University of Athens
S. Poulos
National and Kapodistrian University of Athens, Faculty of Geology, Department of Physical Geography & Climatology
Abstract

Being highly dynamic by nature, due to their changing hydrological regime and to the encroachment of urbanization, industrialization and changing patterns in agriculture, reliable and timely information of coastal areas is a prerequisite for their effective management. The aim of this paper is to assess the use of ERS-2 SAR satellite data to detect short period changes in the case of the R. Sperchios coastal area that is located at the eastern part of the Maliakos Gulf (near the middle of the east coast of the Greek mainland). A Landsat 7 (ΕΤΜ+) image served as a reference for the interpretation of the ERS images. In order to highlight and detect the changes occurred in the study area two methods were applied. The first method is based on the creation of a Temporal Differentiate Image, consisted of the three ERS-2 images (Figure 1). The second method concerns the implementation of Principal Component Transform (PCT) on the three multitemporal scenes. The final images derived from the two different methods were compared and evaluated. Both methods didn't show any significant change along the coastline. PCT method illustrates more clearly the seasonal changes of crops in the lower delta area. Eventually, radar technology gave the opportunity to discriminate shallow areas, which does not appear in satellite optical data. Concurrently, the effect of wind direction was investigated.

Article Details
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  • Remote Sensing and GIS
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