JpGU-AGU Joint Meeting 2020

講演情報

[E] 口頭発表

セッション記号 H (地球人間圏科学) » H-TT 計測技術・研究手法

[H-TT14] 地理情報システムと地図・空間表現(英語)

コンビーナ:小口 高(東京大学空間情報科学研究センター)、若林 芳樹(首都大学東京大学院都市環境科学研究科)、Yuei-An Liou(National Central University)、Ronald C. Estoque(National Institute for Environmental Studies, Japan)

[HTT14-01] Analysis of the Land Surface Temperature Pattern in Kathmandu, Nepal, Using Remote Sensing and GIS.

*Siri Karunaratne Batugoda Gedara1Morimoto - Takehiro2Yuji - Murayama3 (1.Division of Spatial Information Science,Graduate School of Life and Environmental Sciences, University of Tsukuba、2.Division of Spatial Information Science,Faculty of Life and Environmental Sciences, University of Tsukuba、3.Division of Spatial Information Science,Faculty of Life and Environmental Sciences, University of Tsukuba)

キーワード:Kathmandu, urban heat island, land surface temperature pattern, land use change, urban –rural gradient

Land surface temperature (LST) is a striking parameter to detect urban environmental changes. In this study, we assess mean LST distribution pattern in the Kathmandu metropolitan area, Nepal, spatially and temporally based on Landsat standard terrain correction images, TM in 2001 and OLI /TIRS in 2013. Land use and land cover (LULC) were classified primarily into six categories. Then by reclassifying into two categories, we conducted a cross cover comparison. The spatial formation of LST was investigated along the eight directions from the city center. Density maps were generated using the 210m * 210m urban-rural gradient grid. The dramatic expansion of 1.23 percent of annual growth in impervious surface (IS) and, on the contrary, -0.99 percent annual decline in green space (GS) 2 was detected. A considerable correlation between impervious surface density and mean LST was observed in bivariate correlation analysis in 2001. The inverse relationship between green space density and mean LST (R = -0.589) was found in 2013. In the cross cover comparison, the IS-GS total was 0.687 ℃ mean LST, between 2001- 2013. Possible adaptation and mitigation measures should be implemented to achieve a sustainable, safe and resilient mountain city due to the evidence of accelerating the UHI effect in Kathmandu.