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http://dx.doi.org/10.7780/kjrs.2020.36.5.1.5

Development of Quality Control Method for Visibility Data Based on the Characteristics of Visibility Data  

Oh, Yu-Joo (Research Institute, SELab Inc.)
Suh, Myoung-Seok (Department of Atmospheric Science, Kongju National University)
Publication Information
Korean Journal of Remote Sensing / v.36, no.5_1, 2020 , pp. 707-723 More about this Journal
Abstract
In this study, a decision tree type of quality control (QC) method was developed to improve the temporal-spatial representation and accuracy of the visibility data being operated by the Korea Meteorological Administration (KMA). The quality of the developed QC method was evaluated through the application to the 3 years (2016.03-2019.02) of 290 stations visibility data. For qualitative and quantitative verification of the developed QC method, visibility and naked-eye data provided by the KMA and QC method of the Norwegian Meteorological Institute (NMI) were used. Firstly, if the sum of missing and abnormal data exceeds 10% of the total data, the corresponding point was removed. In the 2nd step, a temporal continuity test was performed under the assumption that the visibility changes continuously in time. In this process, the threshold was dynamically set considering the different temporal variability depending on the visibility. In the 3rd step, the spatial continuity test was performed under the assumption of spatial continuity for visibility. Finally, the 10-minute visibility data was calculated using weighted average method, considering that the accuracy of the visibility meter was inversely proportional to the visibility. As results, about 10% of the data were removed in the first step due to the large temporal-spatial variability of visibility. In addition, because the spatial variability was significant, especially around the fog area, the 3rd step was not applied. Through the quantitative verification results, it suggested that the QC method developed in this study can be used as a QC tool for visibility data.
Keywords
Fog; Quality control; Visibility meter; Naked-eye; Spatial and temporal continuity;
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Times Cited By KSCI : 8  (Citation Analysis)
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