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An Overview of Theoretical and Practical Issues in Spatial Downscaling of Coarse Resolution Satellite-derived Products

  • Park, No-Wook (Department of Geoinformatic Engineering, Inha University) ;
  • Kim, Yeseul (Department of Geoinformatic Engineering, Inha University) ;
  • Kwak, Geun-Ho (Department of Geoinformatic Engineering, Inha University)
  • Received : 2019.08.07
  • Accepted : 2019.08.12
  • Published : 2019.08.31

Abstract

This paper presents a comprehensive overview of recent model developments and practical issues in spatial downscaling of coarse resolution satellite-derived products. First, theoretical aspects of spatial downscaling models that have been applied when auxiliary variables are available at a finer spatial resolution are outlined and discussed. Based on a thorough literature survey, the spatial downscaling models are classified into two categories, including regression-based and component decomposition-based approaches, and their characteristics and limitations are then discussed. Second, open issues that have not been fully taken into account and future research directions, including quantification of uncertainty, trend component estimation across spatial scales, and an extension to a spatiotemporal downscaling framework, are discussed. If methodological developments pertaining to these issues are done in the near future, spatial downscaling is expected to play an important role in providing rich thematic information at the target spatial resolution.

Acknowledgement

Supported by : NationalResearch Foundation of Korea (NRF)

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