The main objective of the assignment was to inerprete and combine aerial photography coverage of the area of the catchments basins of Louros and Arachthos rivers which drain into Amvrakikos Gulf (dating back to 1945) and current high resolution satellite imagery to create a number of thematic maps showing the changes effected over time by urban and agricultural development. Changes over time were mapped for river courses, river beds, wetland areas and riparian areas along the Louros and Arachthos rivers and for the lagoons formed on the northern shores of Amvrakikos Gulf. Historical aerial photographs were scanned and assembled into a seamless mosaic, georeferenced to the current Greek projection system and datum. From this background, important elements of the river environment were digitized (banks, riparian areas, flood plains, etc.) and stored into a GIS system. The same elements were digitized from current high resolution satellite imagery of the area and the two data sets were compared using the GIS. Important metrics such as differences in floodplain areas, riparian extent, lagoon coverage etc. were calculated from superposition of the two different datasets thus quantifying the physical changes in the river environment over time.
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