Understanding Spatial-temporal Urban Expansion Pattern Using Impervious Surface Data and Landscape Indexes: A Case Study in Guangzhou (China)

Authors: Wei Fan*, University of Wisconsin - Milwaukee
Topics: Remote Sensing, Land Use and Land Cover Change, China
Keywords: Impervious surface, urban expansion, landscape metrics, gradient analysis, Guangzhou
Session Type: Paper
Day: 4/6/2019
Start / End Time: 5:00 PM / 6:40 PM
Room: Senate Room, Omni, West
Presentation File: No File Uploaded

This paper presents a new viewpoint to understand urban expansion using impervious surface information, which is obtained using remote sensing imagery. This study is to understand and describe urban expansion pattern from the view of impervious surface instead of conventional view of land use/land cover. In this paper, six years impervious surface data (1990-2009) of Guangzhou is extracted via linear spectral un-mixing analysis (LSMA) methods and spatial-temporal characteristics are discussed in detail. Meanwhile, five landscape indexes (patch density, edge density, mean patch size, area-weighted and fragmentation index) are utilized to describe landscape changes of Guangzhou in past 20 years, which are incurred deeply by the impervious surface expansion. In order to specific landscape changes, two transects corresponding to the two urban expansion directions are designed and five landscape metrics in these two transects are reported. Conclusions can be drew and shown as following: (1) Area of impervious surface increases from 12998 to 59911 hectares during 1990 to 2009. Impervious surface varies in different periods. The annual growth rates of impervious surface area during 1990-1995, 1995-1998 and 1998-2000 are 10.16%, 11.61% and 10.78% respectively; (2) annual growth rates decrease from 10.78% (1998-2000) to 5.67% (2000-2003). Nevertheless, during 2003-2009, the annual growth rate has a slight increase comparing with former period with 5.91%; (3) spatially, gravity centers of medium and high percentage impervious surface migrate slightly; (4) according to the gradient analysis in the two transects, it can be observed that the high percentage impervious surface increases gradually in new city districts

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