Detection of Urban Alteration with the Use of CAD and Remote Sensing Data: The Case of Trikala, Center Greece
Dimitris Kaimaris, Dr. Stelios Th. Kouzeleas, Chryssa Karagiannaki, Eleni Linaki

Abstract
This research concerns visualization techniques of an urban area, exploiting spatial and descriptive data editing, connecting and creating also urban visualization processes. This methodology-process applies on the evolution of the urban planning network of Trikala town (Central Greece) since 1945 till today. Contemporary and historical aerial photos were used, scaled 1:8000 up to 1:42000. Satellite images were also used (QuickBird-2). These aerial photos were georeferenced exploiting the Digital Terrain Model (DTM) and contemporary ortho-rectified images through different periods of the study area. The results of the urban planning network evolution are presented with superimposed expansion maps and general indicators representing, in different periods, town limits evolution indicators, free or covering construction area evolution indicators, etc. The aim of this research is to combine visualization techniques and processes in order to produce and present visual or descriptive results ready to be exploited and used in urban planning network changes analysis.

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