热带气象学报2024，Vol.40Issue(4)：537-546,10.DOI:10.16032/j.issn.1004-4965.2024.048
SSIM在高分辨率降水数值预报产品空间检验中的应用
Application of SSIM in Spatial Testing of High-Resolution Precipitation Numerical Forecasting Products
摘要
Abstract
This study proposes a new scheme for comparing and analyzing 0-1 formatted grid fields using the image structure similarity index method(SSIM).With the original application scenario and algorithms optimized,the SSIM index is improved to reflect the position change of rainbands in precipitation fields.The new method is applied to the spatial verification of high-resolution precipitation numerical forecast products generated by the regional modeling system of South China(CMA-GD),specifically for rainstorm cases in Guizhou during the summer of 2020.Comparative analysis with results obtained using the MODE and neighborhood methods shows that the qualitative evaluation of prediction cases is consistent,and the performance of the SSIM* index closely aligns with the MMI index of MODE.It shows the effective application of the improved SSIM method and the new SSIM index in spatial verification for high-resolution precipitation numerical prediction products,and results of the new method are even more reasonable in the assessment of prediction cases.With the whole 0-1 formatted grid fields of precipitation as the spatial objects considered,the new method can capture overall spatial structure characteristics that are not attainable through other methods,offering valuable references for assessing prediction cases based on rain area,rainband structure,and average position.Furthermore,the new method has the advantages of simple and efficient calculation,no subjective parameters setting,and well-determined results that overcome the limitations of the MODE which is the current mainstream method in spatial verification for the precipitation numerical prediction products.Therefore,this research holds good application prospects and is worthy of further study.关键词
降水数值预报/0-1化格点场/空间检验/SSIM应用Key words
precipitation numeric prediction/0-1 formatted grid fields/spatial verification/applied SSIM分类
天文与地球科学引用本文复制引用
陈百炼,杨富燕,陈子通,彭芳,曾莉萍..SSIM在高分辨率降水数值预报产品空间检验中的应用[J].热带气象学报,2024,40(4):537-546,10.基金项目
国家自然科学基金(42165001) （42165001）
中国气象局/广东省区域数值天气预报重点实验室开放基金(J201802)共同资助 （J201802）
