COMPARISON OF VALUATION RESULT OF ECOSYSTEM SERVICES DEPENDING ON THE SPATIAL RESOLUTION OF IMAGERY: USING KOMPSAT-3 AND LANDSAT 8 SATELLITE IMAGERY

摘要

Despite the continuing effort to estimate the value of function and services of ecosystem, most of the researches has used low and medium resolution satellite imagery such as MODIS or Landsat. It means that the researches to measure the ecosystem service value using VHR (Very High Resolution) satellite imagery have not been performed much, while the source of available VHR imagery is increasing. Furthermore, it is lack of study to compare and demonstrate the impact of spatial scale on ecosystem service valuation using VHR and low-medium resolution satellite imagery. Thus, the aim of this study is to compare and evaluate the difference of ecosystem service value (ESV) using KOMPSAT-3 and Landsat 8 imagery over Sejong city, the new administrative capital of S. Korea. Total 6 scenes (3 scenes for each satellite) were used for the analysis, which have been collected during spring (March - April) in every year from 2014 to 2016. As a result, total value of ecosystem services has been decreased from 2014 to 2016 without difference of the resolution. It was $10.074 million and $9.895 million USD in 2014 from the result of KOMPSAT-3 and Landsat 8 respectively, however, decreased to $9.480 million and $8.078 million USD in 2016. The ecosystem service values extracted from Landsat 8 present lower value than the result from KOMPSAT-3, because 'urban' was overestimated in Landsat 8 data which has $0 value of ecosystem service while 'water' was underestimated which has highest value among the classes.