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This study evaluated the applicability of long-term datasets among third-generation reanalysis data CFSR, ERA-Interim, MERRA, and MERRA-2 to determine which dataset is more suitable when performing wind resource assessment for the'Southwest 2.5 GW Offshore Wind Power Project', which is currently underway strategically in South Korea. The evaluation was performed by comparing the reanalyses with offshore, onshore, and island meteorological tower measurements obtained in and around the southwest offshore. In the pre-processing of the measurement data, the shading sectors due to a meteorological tower were excluded from all observation data, and the measurement heights at the offshore meteorological towers were corrected considering the sea level change caused by tidal difference. To reflect the orographic forcing by terrain features, the reanalysis data were transformed by usingWindSim, a flowmodel based on computational fluid dynamics and statistical-dynamic downscaling. The comparison of the reanalyses with the measurement data showed the fitness in the following order in terms of coefficient of determination: MERRA-2 > CFSR =MERRA > ERA-Interim. Since themeasurement data at the onshoremeteorological towers strongly revealed a local wind systemsuch as sea-land breeze, it is judged to be inappropriate for use as supplementary data for offshore wind resource assessment. [ABSTRACT FROM AUTHOR]