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遥感技术与应用  2019, Vol. 34 Issue (5): 1111-1120    DOI: 10.11873/j.issn.1004-0323.2019.5.1111
降水遥感观测专栏     
TRMM卫星3B43降水数据在黄河流域的精度分析
黄桂平1(),曹艳萍1,2()
1.河南大学环境与规划学院,河南 开封 475004
2.黄河中下游数字地理技术教育部重点实验室,河南 开封 475004
Accuracy Analysis of TRMM 3B43 Precipitation Data in the Yellow River Basin
Guiping Huang1(),Yanping Cao1,2()
1.College of Environment and Planning,Henan University,Kaifeng 475004,China
2.Laboratory of Geospatial Technology for the Middle and Lower Yellow River Region,Kaifeng 475004,China
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摘要:

利用黄河流域90个气象站点实测降水数据,分别从流域和格网两个空间尺度,运用相关分析、相对误差等统计分析方法对TRMM卫星3B43 v7降水数据在黄河流域的精度进行了评估,在此基础上分析了精度评价指标的空间分布特征,讨论高程、降水强度等因素对精度的影响。结果表明:①在流域尺度上,TRMM月降水数据与站点实测月降水数据呈高度线性相关,TRMM降水数据比站点实测降水数据略微偏高。②在格网尺度上,大部分格网的TRMM月降水数据与站点实测月降水数据的相关系数较高,偏差较小。③TRMM降水精度与降水强度、高程相关,TRMM降水量与实测降水量的平均绝对误差呈自东南向西北递减规律,与黄河流域降水分布规律相一致;相对误差、平均误差和平均绝对误差等指标随着高程的增加呈现逐渐减小的趋势。整体上,对于黄河流域,随着降水量的增多,TRMM数据倾向于低估降水量;高海拔区域,TRMM低估降水量,低海拔区域,TRMM高估降水量。通过评估TRMM卫星降水产品在黄河流域的精度,为本地区地面降水产品提供有效补充。

关键词: TRMM降水黄河流域精度评估影响因素    
Abstract:

Based on the correlation analysis and relative error methods, the accuracy of TRMM 3B43 v7 precipitation data at the watershed and grid scale in the Yellow River Basin was validated using 90 meteorological stations data. The spatial distribution characteristics of the accuracy evaluation indexes were analyzed. The influence of elevation and precipitation intensity on the accuracy of TRMM precipitation was discussed. The results show that: (1) At the basin scale, the TRMM monthly precipitation data is highly linearly related to the measured precipitation data at the site. TRMM precipitation data is slightly higher than the site-measured precipitation data. (2) At the grid scale, the TRMM monthly precipitation data of most grids have a high correlation coefficient with the measured precipitation data at the site. The deviation between TRMM precipitation and in site measured precipitation is small. (3) The accuracy of TRMM precipitation is related to precipitation intensity and elevation. The average absolute error between TRMM precipitation and measured precipitation is decreasing from southeast to northwest, which is consistent with precipitation distribution in the Yellow River Basin. The relative error, average error and average absolute error tend to decrease with the increase of elevation. Overall, over the Yellow River Basin, TRMM data tend to underestimate precipitation as precipitation increases. TRMM data underestimates precipitation in high altitude areas, overestimates precipitation in low altitude areas. By assessing the accuracy of TRMM satellite precipitation products in the Yellow River Basin, it provides an effective supplement for ground precipitation products in the region.

Key words: TRMM Precipitation    Yellow River Basin    Accuracy Assessment    Influencing Factors
收稿日期: 2018-06-27 出版日期: 2019-12-05
ZTFLH:  TP75  
基金资助: 国家自然科学基金项目(41701503);河南大学引进博士科研启动基金项目(B2015060)
通讯作者: 曹艳萍     E-mail: 1299847273@qq.com;caoyp@henu.edu.cn
作者简介: 黄桂平(1996 - ),男,江西赣州人,学士,主要从事遥感、地理信息系统应用等方面的研究。E?mail:1299847273@qq.com
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引用本文:

黄桂平,曹艳萍. TRMM卫星3B43降水数据在黄河流域的精度分析[J]. 遥感技术与应用, 2019, 34(5): 1111-1120.

Guiping Huang,Yanping Cao. Accuracy Analysis of TRMM 3B43 Precipitation Data in the Yellow River Basin. Remote Sensing Technology and Application, 2019, 34(5): 1111-1120.

链接本文:

http://www.rsta.ac.cn/CN/10.11873/j.issn.1004-0323.2019.5.1111        http://www.rsta.ac.cn/CN/Y2019/V34/I5/1111

图1  黄河流域地理位置以及90个气象站点分布
图2  流域尺度上TRMM与站点月降水数据的散点图
评价指标

站点均值xˉ

/mm

TRMM均值yˉ/mm

相关系数

R

相对误差

BIAS /%

平均误差

EM /mm

平均绝对误差EMA /mm
流域月尺度38.4838.890.9931.090.422.68
表1  流域尺度上TRMM与站点降水数据比较(1998~2016年)
年份相关系数R相对误差BIAS /%年份相关系数R相对误差BIAS /%
19980.9980.4720080.9936.03
19990.997-1.0020090.9971.38
20000.9971.0820100.9952.16
20010.9950.9420110.995-1.74
20020.9881.7720120.9868.24
20030.990-2.9620130.9981.40
20040.9994.7720140.992-3.16
20050.995-1.4020150.994-0.07
20060.995-3.5020160.9985.49
20070.9972.29
表2  流域尺度上各年TRMM与站点降水数据比较
图3  格网尺度上TRMM与站点月降水数据的散点图
评价指标

站点均值

xˉ/mm

TRMM均值

yˉ/mm

相关系数

R

相对误差

BIAS /%

平均误差

EM /mm

平均绝对误差

EMA /mm

格网月尺度38.4840.390.9284.981.9110.09
表3  格网尺度上TRMM与站点降水数据比较(1998~2016年)
图4  TRMM降水精度及空间分布
图5  精度评价指标与各站点高程的关系
图6  精度评价指标与各站点多年平均降水量的关系
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