Journal of Range and Watershed Managment

Statistical Comparison of IMERG and TMPA 3B42V7 Level-3 Precipitation Products of TRMM and GPM (Case Study: Kashafrud Basin, Khorasan Razavi Province)

Document Type : Research Paper

Authors

Seyde maryam Alibakhshi
Alireza Faridhosseini
kamran davari 1
amin alizadeh
Henry Munyka Gathecha 2

1 Associate Professor of Water Engineering department, Ferdowsi University of Mashhad

2 Associate Professor of Faculty of Geo-Information Science and Earth Observation of the University of Twente

https://doi.org/10.22059/jrwm.2017.61194
Abstract
Satellite precipitation products have been used in scientific studies in global and regional scales from several decades ago. The purpose of this research is quantitative comparison between TRMM and GPM precipitation products in Kashafrud basin. The important point about these products is their accuracy and pixel size. GPM satellite launched on 28th February 2014 and there is no research in Iran and few in the world. This research aims to assess GPM and its predecessor i.e. TRMM products in comparison with 34 ground rain gauge stations in the basin. Comparisons are done in basin and gauge spatial scales and each in daily and monthly time scales. For validation, the statistical metrics including RMSE, MAE, CC, BIAS, FAR, POD and CSI are used.  The results indicated that generally the 3B42V7 product from TRMM has higher accuracy than IMERG product from GPM in our study region. IMERG product only in monthly and basin scale has better accuracy in comparison to 3B42V7 product. Regarding time scale comparison, monthly analysis showed higher accuracy. RMSE value for TMPA product in daily time scale for rain gauge and basin scale is 1.88 and 1.55 and in monthly scales is 2.87 and 2.77, respectively. Also, RMSE for IMERG product in rain gauge and basin in daily time scale is 2.43 and 2.3 and for monthly time scale 3.64 and 2.56, respectively.

Keywords

Precipitation
Kashafrud Basin
IMERG Data
3B42V7 Data
GPM satellite
TRMM Satellite
Journal of Range and Watershed Managment
Volume 69, Issue 4
Winter 2017
Pages 963-981

  • Receive Date 05 June 2016
  • Revise Date 07 March 2017
  • Accept Date 27 March 2017
  • Publish Date 19 February 2017

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