Studies on Hanoi Urban Transition in the Late 20th Century Based on GIS/RS PDF Print E-mail
Written by Mr. Ho Dinh Duan   
Tuesday, 12 January 2010 11:23
Over periods, Hanoi urban has greatly expanded to the west and southwest. Although Hanoi urban initially located by the West lake, its space has passed over the north side of the lake in recent years. Until 1993, landcover types around the lake mainly were cultivated land. Until 2000 and then 2003, 2005 at this fringe area agricultural land type has still remained and simultaneously newly constructed large and tall buildings have encroached, indicating that urbanization is in progress.

Urbanization of Hanoi largely occurred in 1993–2000, and continues today at a low rate and primarily on the south side of the Red River. The urban growth are realized in expansion, in-fill and linear branch patterns. To the north, growth is limited by West Lake. Two main growth axes run in the northeast–southwest and north - east directions. The west axe appeared lately, perhaps since 2003 following the construction of  the national stadium My Dinh. The current development of the city does not seem to match the city Master Plan.
This paper describes the urbanization process of Hanoi during the late 20th century using the method of GIS (Geographic Information Systems) and remote sensing technologies. The data sources for the study compose of historical maps, recent maps, and various satellite images acquired from 1975 to 2005 (Landsat MSS, TM, ETM, JERS, ASTER, IKONOS and QuickBird). The main techniques used in our image processing are NDVI and Water Index, combined with a decision-tree classification for medium resolution images (Landsat and ASTER). High resolution images (IKONOS and QuickBird) were used to validate the signature of land use classes and to verify certain urban construction features.

The analysis showed that the spatial growth of Hanoi is limited by natural barriers, such as streams to the northeast and east, water bodies to the north, and a swamp area to the south. The expansion of Hanoi stretches in four directions – south, Southwest, West and East – following main transportation axes connecting the inner city to neighboring areas. Both spatial expansion and in-fill expansion took place in the urbanization of Hanoi. It is important to relate the urban transition with social-economic mile stones of the city and to find correlations between remote sensing derived maps and indices with other statistics such as population, population density, road and housing densities, but these have not been included in our present work.

Last Updated on Tuesday, 19 October 2010 00:05

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