STUDY ON LAND USE CLASSIFICATION AND ELASTIC URBANIZATION IN CHEN GGUAN DISTRICT OF LHASA CITY

摘要

Based on the Landsat-5 TM data in Chengguan District of Lhasa City from 1994 to 2011, this study interpreted and analyzed these remote sensing image using Envi4.7 and Arcgis9.3 in different periods. The results show: woodland was decreased by 2.71%, while grassland and construction land area were increased significantly by 4.55% and 6.98% respectively in 1994 and 2011. The maximum rate of change of land use types was construction land, with an average annual rate of 14.43%. In 1994~2011, the area of woodland and unused land were decreased rapidly by 10.76% and 10.59%, however construction land and grassland were rapidly increased by 23.30% and 21.09%, respectively. In 2006 ~ 2011, the forest had the maximum growth rate of 21.07%, followed by the water body, with an increase of 11.39 %. This conclusion echoes that the urbanization of Lhasa belongs to the "elastic urbanization" model.