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Urban areas in Sri Lanka are declared politically on the basis of administrative units. However, there has been no such declaration in more than 20 years although this has been a period of considerable urban development. Further, there is no census data available on urbanization even on the basis of administrative units. As recent data, analysts have only the sample demographic survey in 1994, to go by. area, they facilitate rapid assessment of trends. iii) Spatial patterns of urban growth such as the urban core, clusters, ribbon development, and sprawl can be very clearly visualized by the use of Aps. iv) They are arguably cheaper than field surveys, especially when the cost of AP coverage could be apportioned over a number of projects that use the data.

Analysis of urbanization trends in the greater Colombo area from 1956 to 1994 using air photos