The use of a high-resolution satellite-based precipitation product on a global-scale is attractive to hydrological applications. However, it should be systematically evaluated from various perspectives as the quality property is dependent on the geographical and topographical features of a region. This study aims to comprehensively assess the Climate Prediction Center morphing technique (CMORPH) precipitation product over South Korea. Two evaluation approaches, the general evaluation using statistical metrics and the detection evaluation (to measure skill in detecting precipitation and non-precipitation) using categorical metrics, are employed based on an 18-year long-term period of record. As a result, the CMORPH product tended to underestimate precipitation over South Korea, and the level of the underestimation varied with the seasons and regions. The overall quality was adequate for hydrological applications that require precipitation data at the annual-to-daily resolution but not at hourly resolution. Skill in detecting hourly precipitation in a storm event was 60% of the rain-gauge data, and the accuracies of total volume and peak value were 45% and 40%, respectively. The quality in the coastal regions and islands was not as good as in inland areas at low altitudes. The accuracy in a wet season was better than that in a dry/winter season. Notably, the CMORPH precipitation product was not suitable for snowfall data. Ultimately, the CMORPH product at hourly resolution needs a correction process using the local measurement systems for enhancing the quality property over South Korea.

在全球范围内使用高分辨率的基于卫星的降水产品对水文应用具有吸引力。但是，应从各种角度对它进行系统地评估，因为质量属性取决于区域的地理和地形特征。这项研究旨在全面评估韩国上空的气候预测中心变质技术（CMORPH）的降水量。基于18年的长期记录，采用了两种评估方法，即使用统计指标的常规评估和使用分类指标的检测评估（以测量降水和非降水的技能）。结果，CMORPH产品趋向于低估了韩国的降水量，低估的程度随季节和地区而变化。总体质量足以满足需要以逐日分辨率而非小时分辨率提供降水数据的水文应用。暴雨事件中每小时降水的检测技术占雨量数据的60％，总体积和峰值的准确度分别为45％和40％。沿海地区和岛屿的质量不及低海拔内陆地区的质量。雨季的准确性优于旱季/冬季。值得注意的是，CMORPH降水产品不适用于降雪数据。最终，每小时分辨率的CMORPH产品需要使用本地测量系统进行校正的过程，以增强韩国的品质。总体质量足以满足需要以逐日分辨率而非小时分辨率提供降水数据的水文应用。暴雨事件中每小时降水的检测技术占雨量数据的60％，总体积和峰值的准确度分别为45％和40％。沿海地区和岛屿的质量不及低海拔内陆地区的质量。雨季的准确性优于旱季/冬季。值得注意的是，CMORPH降水产品不适用于降雪数据。最终，每小时分辨率的CMORPH产品需要使用本地测量系统进行校正的过程，以增强韩国的品质。总体质量足以满足需要以逐日分辨率而非小时分辨率提供降水数据的水文应用。暴雨事件中每小时降水的检测技术占雨量数据的60％，总体积和峰值的准确度分别为45％和40％。沿海地区和岛屿的质量不及低海拔内陆地区的质量。雨季的准确性优于旱季/冬季。值得注意的是，CMORPH降水产品不适用于降雪数据。最终，每小时分辨率的CMORPH产品需要使用本地测量系统进行校正的过程，以增强韩国的品质。