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The Applicability Evaluation of Three Satellite Products in Tianshan Mountains
JIN Xiao-long, SHAO Hua, ZHANG Chi, YAN Yan
JOURNAL OF NATURAL RESOURCES ›› 2016, Vol. 31 ›› Issue (12) : 2074-2085.
PDF(4093 KB)
PDF(4093 KB)
The Applicability Evaluation of Three Satellite Products in Tianshan Mountains
The uncertainty of the satellite rainfall products limits their applicability in mountainous areas. This paper evaluates theapplicability of a new rainfall product-Global Precipitation Measurement (GPM) in Tianshan Mountain area based on the meteorological stations data and commonly used precipitation products-TRMM and CMORPH. The data of a total of 167 weather stations from 2014 to 2015 were used to evaluate and compare the accuracies of GPM, TRMM and CMORPH. Root mean square error (RMSE), Correlation coefficient (R), Percent bias (PB) and Classification statistical analysis index (FAR, POD, ETS, BIAS) were used to assess the applicability of GPM. The result shows that: GPM has the higher accuracy than the other two commonly used satellite rainfall products. Specifically: 1) Although three data sets perform well in summer and autumn, GPM has the highest correlation (R≥0.6) and the smallest relative error (PB≈10%) between the observed data, compared to TRMM and CMORPH. 2) Throughout the Tianshan Mountains, GPM shows the lower error range (-55%-55%). 3) In different elevation zones, GPM shows the lower relative error and higher correlation coefficient. 4) Three sets of data all show higher accuracy (POD≈0.58) and lower error rate (FAR≈0.63) when detecting the weak precipitation. The comprehensive statistical analysis of four indexes indicates that GPM performs the best and estimates the precipitation with higher accuracy and lower error.
CMORPH / GPM / satellite precipitation dataset / Tianshan Mountains / TRMM {{custom_keyword}} /
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