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Analysis on the urban expansion of Hangzhou City and its driving mechanism based on remote sensing
Author(s): 
Pages: 90-97
Year: Issue:  4
Journal: Journal of Northwest Normal University(Natural Science)

Keyword:  urban expansiondriving forceremote sensingprincipal component analysisHangzhou City;
Abstract: Urban boundary information of Hangzhou is extracted from land sat MSS (1984) and TM (1994 and 2005 ) images with supervised classification . Based on the urban growth form , trend , speed , intensity , dynamic attitude , the population-urban grow th index , etc , this paper analyzes the characteristics of urban spatial-temporal change in Hangzhou City , Zhejiang Province . Combined with social and economic statistical data , this paper further explores the driving factors of Hangzhou urban expansion by PCA model . The result shows that , in addition to the southwest direction of Hangzhou , other direction is remarkable expansion ; the appearance of Hangzhou urban belongs to “fan-shaped expansion” with “axial extension” . Future expansion towards Xiaoshan and Yuhang district will be rapid . Annual average absolute increase of urban expansion area is 6.58 km2 from 1984 to 1994 , and 9.67 km2 from 1995 to 2005 . Its expansion speed is accelerated ; if takes the total land area of Hangzhou urban as a benchmark , expansion intensity is faster . If takes the area of the former period as the benchmark , expansion rate is in slow down ; population-urban grow th index shows that Hangzhou urban expansion of intensive degree is increasing . The paper reduces 15 major social and economic factors which influence Hangzhou urban expansion to four comprehensive factors using PCA . That economic and industrial development is the first driving force , economic grow th is the most fundamental and important factor which cause Hangzhou urban expansion , the development of industries especially industrial structure change , to some extent , accelerates urban expansion . Urban basic construction is the second driving force , which is direct driving force leaded to urban expansion . The development of urban population is the third driving force , which is an original driver of Hangzhou urban expansion . Traffic development is the forth driving power , which has directionality role in Hangzhou urban expansion and influences the external form of Hangzhou urban . In addition , the result shows that their driving role in Hangzhou urban expansion has been enhanced each year by the analysis of the comprehensive score of the four comprehensive driving forces .
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