A comparative analysis of the urban web of the greater Athens agglomeration for the last 20 years period on the basis of Landsat imageryThird International Conference on Environmental Management, Engineering, Planning and Economics (CEMEPE 2011) & SECOTOX (2011)
AbstractAthens, Greece, like most of the world’s capital cities, is facing a continuous increase in both population and extent. Its urban expansion is mainly through encroachment into the adjacent agricultural and natural lands. Although the urban sprawl in Athens can be mostly attributed to the expansion of the residential areas, the total coverage by impervious surfaces in the city has been significantly increased during the last decade due to construction and new development projects that took place during the preparation period of the 2004 Olympic Games. In this study, a 20-year Landsat imagery archive (1988-2007) was used to quantitative map the dynamics of urban sprawl in greater Athens, based on the growth rates of the urbanized areas. For characterizing and quantifying urban land cover changes, several techniques were applied. To detect urban features, a machine learning classifier approach was adopted. This classifier uses an inductive learning algorithm to generate production rules from training data. For validating the results, remote sensing data of higher resolution than Landsat data were used. For this purpose, ASTER (Advanced Specaborn Thermal Emission and Reflection Radiometer) and Ikonos images of the greater Athens agglomeration acquired between 2001 and 2007 were employed. The validation procedure involved a set of randomly selected points and achieved an overall accuracy of 94.8 %, 93.3 % and 95.9 % for the years 2007, 2004 and 2001, respectively. Results revealed a continuing growth of urban features in the greater Athens agglomeration, particularly in the Messogia plain, where the new international airport of El. Venizelos is located, as well as in the western parts of greater Athens, across the Thriassion industrial area. The growth rate of urban areas was found to be variable in time, obtaining its maximum value between 2000 and 2004, as expected. The overall increase of the urban areas during the 20-year period was estimated of about 30%.
- Earth observation,
- urban growth monitoring,
- urban planning
Citation InformationChrysoulakis, N., Mitraka, Z., Stathopoulou, M. and Cartalis, C., 2011. A comparative analysis of the urban web of the greater Athens agglomeration for the last 20 years period on the basis of Landsat imagery. Proc. of the Third International Conference on Environmental Management, Engineering, Planning and Economics (CEMEPE 2011) & SECOTOX Conference, Skiathos, Greece, June 19-24.