
Research on the Quality Evaluation of GPM Satellite Precipitation Data Products
Xi JIANG, Yan-li LIU, Yong-xiang WU, Gao-xu WANG, Wei WU, Jun-liang JIN, Rui-min HE, Cui-shan LIU
Research on the Quality Evaluation of GPM Satellite Precipitation Data Products
Satellite precipitation products serve as an important data supplement to ungauged or data-deficient region, whose temporal and spatial accuracy is crucial to hydrological simulation and prediction. The Yarlung Zangbo River Basin is a typical data-deficient region due to the high-cold mountainous location and extremely difficult for local observation. The applicability of the two satellite precipitation products, GSMap and GPM-IMERG, in this area is evaluated through the combination of quantitative indicators and classification indicators.The results show that both satellite precipitation products can accurately detect the occurrence of precipitation events. Compared with their previous generation TRMM satellite precipitation data, the two satellite precipitation data present higher accuracy (Bias<0.579), the correlation is more significant (CC>0.902), in contrast with the measured ground precipitation data. It is consistent for the spatial distribution of the correlation between the two types of satellite precipitation data and the ground-measured data,a strong correlation in the middle reaches of the river, and weak in the upstream and downstream. For the Yarlung Zangbo River Basin, GPM satellite precipitation products undertake better applicability than TRMM precipitation products, and could better meet the precipitation data requirements of water resources development and utilization. In the future, they can be integrated and assimilated with ground-based observation data to generate more reliable precipitation data products.
GSMap / GPM-IMERG / data-deficient region / applicability analysis / rainfall / Yarlung Zangbo River Basin {{custom_keyword}} /
Tab.1 Spatio-temporal accuracy information of common data products表1 常见数据产品时空精度信息 |
降水产品 | 空间精度 | 空间覆盖范围 | 最小时间精度 | 时间范围 | 发布单位 |
---|---|---|---|---|---|
TRMM | 0.25° | 60°N~60°S | 3 h | 1997-2015 | NASA |
50°N~50°S | 月 | ||||
GPM-IMERG | 0.10° | 90°N~90°S | 0.5 h | 2014至今 | NASA |
GSMap | 0.10° | 60°N~60°S | 1 h | 1998至今 | JAXA |
PERSIANN | 0.25° | 60°N~60°S | 3 h | 1983至今 | UC Irvine |
CMORPH | 8 km | 60°N~60°S | 0.5 h | 1998至今 | NOAA/CPC |
0.25° | 3 h | ||||
GLDAS | 0.25° | 60°N~90°S | 3 h | 2000至今 | NASA |
CRU | 0.50° | 全球陆地范围 | 月 | 1901-2018 | Univercity of East anglia |
APHRODITE | 0.25° | 东亚地区 | 日 | 1951-2007 | Hirosaki University |
Tab.2 Table of precipitation observation about satellite precipitation and ground observation station表2 卫星降水与地面观测站降水观测情况表 |
卫星监测 | 地面实测 | |
---|---|---|
发生 | 未发生 | |
发生 | T | F |
未发生 | M | 0 |
Fig.2 Monthly scale GSMap, GPM-IMERG precipitation products and measured data scatter density map图2 月尺度GSMap与GPM-IMERG降水产品与实测数据散点密度图 |
Tab.3 Statistical table of correlation and relative deviation between two kinds of satellite precipitation data and ground-measured data at monthly scale表3 月尺度两种卫星降水数据与地面实测数据相关性、相对偏差统计表 |
站点 | GSMap卫星降水产品 | GPM IMERG卫星降水产品 | ||
---|---|---|---|---|
CC | Bias | CC | Bias | |
波密站 | 0.471 | -0.247 | 0.919 | -0.062 |
林芝站 | 0.798 | -0.267 | 0.959 | 0.251 |
江孜站 | 0.870 | 0.021 | 0.966 | 0.451 |
拉孜站 | 0.864 | -0.288 | 0.963 | 0.489 |
当雄站 | 0.895 | 0.128 | 0.949 | 0.007 |
泽当站 | 0.858 | 0.488 | 0.976 | -0.592 |
普兰站 | 0.306 | 0.425 | 0.582 | -0.993 |
Tab.4 Statistical table of correlation and relative deviation between two kinds of satellite precipitation data and ground-measured data at daily scale表4 日尺度两种卫星降水数据与地面实测数据相关性、相对偏差统计表 |
站点 | GSMap卫星降水产品 | GPM IMERG卫星降水产品 | ||
---|---|---|---|---|
CC | Bias | CC | Bias | |
波密站 | 0.238 | -0.375 | 0.542 | -0.123 |
林芝站 | 0.339 | -0.029 | 0.458 | 0.049 |
江孜站 | 0.079 | 1.568 | 0.309 | 0.404 |
拉孜站 | 0.156 | 0.639 | 0.335 | 0.361 |
当雄站 | 0.195 | 0.379 | 0.373 | 0.556 |
泽当站 | 0.261 | 0.541 | 0.329 | 0.270 |
普兰站 | 0.155 | 1.647 | 0.256 | 2.091 |
Tab.5 Table of classification analysis results table表5 分类分析结果表 |
卫星产品 | 探照率(POD) | 错报率(FAR) |
---|---|---|
GSMap | 0.958 | 0.100 |
GPM-IMERG | 0.924 | 0.172 |
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