Use of remote sensing and geographical information systems to estimate green space surface-temperature change as a result of urban expansion

Abstract

A combined approach of remote sensing (RS) and geographical information systems (GIS) was used in this study to identify the impact on urban surface radiant temperature (SRT) of urban green-space change. Urban SRT increases as green-space area is converted into non-green-space area. Also, well preserved green space and newly connected green space contribute to a decrease of the SRT. Seoul Metropolitan area is rapidly expanding. Existing urban SRT studies have, however, mainly been conducted for Seoul City. The most rapidly expanding area in Korea is now the Seoul suburban area, for example the Mt Gwanggyo area. Although changes of SRT and normalized difference vegetation index (NDVI) as a result of land-use change have been measured in many other studies, the results in these studies were derived from data from different seasons. Also, these studies did not examine a newly expanding area. Considering these problems, the same seasonal multitemporal data were used in this study to derive the SRT change for the same season in different years. This study confirmed the importance of effective management and location of urban green space for urban SRT mitigation. Ultimately, the impact on urban SRT of urban green-space change should be regarded as an important factor in urban planning.

The Impact of Green Space Changes on Air Pollution and Microclimates: A Case Study of the Taipei Metropolitan Area

“…For instance, less air pollution, smaller rainfall patterns, and cooler temperatures are associated with improvements in space aggregation, increasing the large sized green space patch. These results are similar to the research findings by Beatley [9], Jo [10], Yang et al [11], Shin and Le [15], Herb et al [16], and Leuzinger et al [17]. However, they didn't discuss the patterns of green space, they only emphasized the total areas of green space.…”

“…Green spaces are semi-natural areas [7] that not only have the environmental function of blocking noise [8], reducing carbon emissions and air pollution [9][10][11][12], conserving water and soil [13,14], adjusting the microclimate and moderating temperatures [12,[15][16][17][18][19], but also have the ecological functions of recovering fertility, preserving ecologically sensitive areas, providing the habitat and feeding spaces for various species [20,21], and stabilizing ecological systems [22]. Moreover, green space has the landscape functions of buffering interferential land use while enhancing environmental beauty and visual aesthetics.…”

Surface temperature change of spruce forest as a result of bark beetle attack: remote sensing and GIS approach

“…The physical principle is the change in the proportion of sun radiance reflection, evapotranspiration and sensible heat (Gates 2003;Pokorný 2001). Removing vegetation cover may result in increasing surface temperatures (Shin and Lee 2005;Hais 2006). Such changes could have consequences for the microclimate and energy balance of the area (Ripl 1992;Ripl et al 1994).…”

Effect of vegetation biomass structure on thermal performance of tropical green roof

“…The heat retention capacity of the urban fabric could be ameliorated by vegetation supplemented by green roofs (Bass et al 2003;EPA 2009b). Passive cooling due to latent heat extraction has been widely recognized as a key benefit of urban green spaces (Taha et al 1991;Köhler 2004;Shin and Lee 2005;Chang et al 2007; Lee et al 2009) and green roofs (Takakura et al 2000;Liu 2003;Wong et al 2003). The energysaving potentials (Akbari and Konopaci 2005) has been strongly advocated as the economic-environmental justification for roof greening.…”