Study on Satellite Images Based Spectral Emissivity, Land Surface Temperature and Land-Cover in and Around Kuju Volcano, Central Kyushu, Japan

Abstract

The prime objective of this study is to build a relationship among spectral emissivity, land surface temperature and land-covers by using satellite images in and around Kuju volcano of 2000 and 2006. The land-cover types are classified into bared soil (or water), mixed land, and vegetated land on the basis of vegetation index (NDVI). Approximately 29% of bared soil and 16% of mixed land were decreased and approximately 24% of vegetated area was increased respectively from 2000 to 2006. The emissivity values ranged for bared soil, mixed land and vegetated land respectively are 0.931 to 0.973, 0.973 to 0.9896, 0.9896 to 0.9901 at 2000 and 0.9185 to 0.975, 0.975 to 0.98997, 0.98997 to 0.9901 at 2006. The highest land surface temperature (LST) is 49°C within the bared soil and lowest LST is about 10°C within the dense vegetated land in 2000.Also, the highest LST is 44°C within the bared soil and lowest LST is 8°C within the dense vegetated land in 2006. The average LST of our study area increased by 0.92°C within the mixed land from 2000 to 2006, but the average LST dropped 1.28°C within the bared soil and 1.01°C within vegetation region respectively from 2000 to 2006.