tailieunhanh - Monitoring influence of urbanization on urban thermal environment using multi-temporal LANDSAT imagery: application to Da Nang city

This study illustrates urbanization in Da Nang city and its impacts on local thermal environments using remote sensing. In this study, multi-generation Landsat images from 1990, 1995, 2000, 2005, 2010 and 2014, were used to assess the city’s urban expansion and accompanied land surface temperature (LST) characteristics. | Vietnam Journal of Earth Sciences 37 (2015) 318-327 Vietnam Academy of Science and Technology Vietnam Journal of Earth Sciences (VAST) Website: Monitoring influence of urbanization on urban thermal environment using multi-temporal LANDSAT imagery: application to Da Nang city Dang Trung Tu, Nguyen Thi Thu Ha*, Nguyen Thi Mai Ngan, Pham Thi Nhung VNU University of Science Accepted 25 December 2015 ABSTRACT This study illustrates urbanization in Da Nang city and its impacts on local thermal environments using remote sensing. In this study, multi-generation Landsat images from 1990, 1995, 2000, 2005, 2010 and 2014, were used to assess the city’s urban expansion and accompanied land surface temperature (LST) characteristics. Results showed that Da Nang urban expanded twice in 2014 (8,634 ha) comparing to 1990 (4,485 ha) and high temperature anomalies were closely associated with built-up and bare-soil land-covers. As consequence, areas covered by the highest LST correspondently expanded from center of Thanh Khe, Hai Chau districts to mostly all 6 present downtown districts. The mean LST difference between the urban downtown area and the suburban area tends to increase over time, from in 1990 to in 2014. In the context of moving towards “a friendly environmental Da Nang city”, this study provides useful information for understanding the local climatic and environment changes that occurred during rapid urbanization. Keywords: Urbanization, Land surface temperature, impervious surface, Landsat, Da Nang. ©2015 Vietnam Academy of Science and Technology 1. Introduction Urbanization and urban expansion are the dominant factors in regional landscape evolution across the world, and can significantly affect local climate. Rapid urbanization, particularly in a developing country such as Vietnam, results from the large-scale development of commercial, manufacturing and transportation areas. Urbanization alters the thermal .