Abstract
In this study, the suitability of the research version
Tropical Rainfall Measuring Mission (TRMM) Multi-satellite
Precipitation Analysis (TMPA) 3-hourly product has been
evaluated at various time scales including the finest resolution
possible at Lai Nullah basin (centroid: 33°40'19.94"N, 73°
1'27.70"E) in Islamabad, Pakistan. TMPA hourly rain rates
(mm/h) are assessed by using most commonly used statistical
measures such as correlation coefficients (CC), mean bias error
(MBE), mean absolute error (MAE) and root mean square error
(RMSE). Results reveal that the TMPA exhibited an overall
underestimation. TMPA underestimated rainfall during monsoon
and post-monsoon period while overestimated during premonsoon and winter seasons. During monsoon and post-monsoon
seasons, greater MBE and RMSE are estimated. Overall, a weak
correlation with high RMSE value is observed among TMPA and
reference gauge hourly rain rates; at 3-hourly scale CC is 0.37
and RMSE is 5.12 and at daily scale CC is 0.50 and RMSE is
1.99. Significant correlation is noticed at decadal (CC = 0.75) and
monthly (CC = 0.9) time scales having RMSE well within the
tolerance threshold. Based on implementation of TMPA data in
our study area, it is inferred that TMPA is more reliable at time
scales of decadal and above than fine time scales of 3-hourly and
daily.
Asid Ur Rehman, Farrukh Chishtie, Waqas A. Qazi, Sajid Ghuffar, Imran Shahid, Khunsa Fatima. (2018) Validation of TRMM 3B42 Rainfall Product at Lai Nullah Basin, Islamabad, Pakistan, Journal of Space Technology , Volume 8, Issue 1.
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