Evaluation of GPM rainfall Data over north coast of Egypt

Using of satellite imagery in the rainy estimate becomes widespread especially in the places which suffer from-the absence of a good monitoring ground system. North coast in Egypt exposes to rainfall with strong spatially variability. This paper aims to evaluate one of satellite rainfall estimation products, called Global Precipitation Measurement (GPM) using the rain gauge data as a reference. GPM data provided a great coverage between 65° north latitude and 65° south latitude with spatial resolution 0.1 degree and temporal resolution 1 hour. The GPM was released on the internet since September 2nd, 2014 offering the precipitation data in hourly and daily-format since March 1st, 2000. In this study, the GPM daily data during the period (2004-2014) were evaluated-by comparing with the rain gauge data for the same period. The comparison was performed using statistical-criteria and the findings indicate that the GPM data performed well and underestimated the observed one. Furthermore, satellite data is adjusted using a bias correction factors in order to correct the measured data; the-results show better Relative Bias values and the satellite data overestimate gauge measurements. Generally, this-study recommends applying GPM precipitation data in hydrological and different water applications.