Trend Analysis of Urban Heat Islands(UHIs) According to Urban Area Change in Asian mega cities

Kyung-Il Lee1, Yoonji Kim1, Hyun Chan Sung2 and Seong-Woo Jeon3, (1)Korea University, Seoul, South Korea, (2)Environmental GIS/RS Center, Korea University, Seoul, South Korea, (3)Korea University, Environmental Science & Ecological Engineering, Seoul, South Korea