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http://dx.doi.org/10.7780/kjrs.2021.37.6.3.2

Applicability Evaluation of Spatio-Temporal Data Fusion Using Fine-scale Optical Satellite Image: A Study on Fusion of KOMPSAT-3A and Sentinel-2 Satellite Images  

Kim, Yeseul (National Satellite Operation & Application Center, Korea Aerospace Research Institute)
Lee, Kwang-Jae (National Satellite Operation & Application Center, Korea Aerospace Research Institute)
Lee, Sun-Gu (National Satellite Operation & Application Center, Korea Aerospace Research Institute)
Publication Information
Korean Journal of Remote Sensing / v.37, no.6_3, 2021 , pp. 1931-1942 More about this Journal
Abstract
As the utility of an optical satellite image with a high spatial resolution (i.e., fine-scale) has been emphasized, recently, various studies of the land surface monitoring using those have been widely carried out. However, the usefulness of fine-scale satellite images is limited because those are acquired at a low temporal resolution. To compensate for this limitation, the spatiotemporal data fusion can be applied to generate a synthetic image with a high spatio-temporal resolution by fusing multiple satellite images with different spatial and temporal resolutions. Since the spatio-temporal data fusion models have been developed for mid or low spatial resolution satellite images in the previous studies, it is necessary to evaluate the applicability of the developed models to the satellite images with a high spatial resolution. For this, this study evaluated the applicability of the developed spatio-temporal fusion models for KOMPSAT-3A and Sentinel-2 images. Here, an Enhanced Spatial and Temporal Adaptive Fusion Model (ESTARFM) and Spatial Time-series Geostatistical Deconvolution/Fusion Model (STGDFM), which use the different information for prediction, were applied. As a result of this study, it was found that the prediction performance of STGDFM, which combines temporally continuous reflectance values, was better than that of ESTARFM. Particularly, the prediction performance of STGDFM was significantly improved when it is difficult to simultaneously acquire KOMPSAT and Sentinel-2 images at a same date due to the low temporal resolution of KOMPSAT images. From the results of this study, it was confirmed that STGDFM, which has relatively better prediction performance by combining continuous temporal information, can compensate for the limitation to the low revisit time of fine-scale satellite images.
Keywords
Resolution; Fusion; Fine-scale image; KOMPSAT; Sentinel-2;
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Times Cited By KSCI : 1  (Citation Analysis)
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