Comparative analysis of ground-based weather radar and space-borne GPM data

Study of various physical processes related to water cycle, which is of interest to scientific communities of meteorology, hydrology, environment, ecology, agriculture etc., often require reliable precipitation measurements. This paper presents the comparative analysis of Global Precipitation Measurement (GPM) Ku-band Precipitation Radar's (KuPR) attenuation corrected reflectivity values with Next-Generation Radar (NEXRAD) KAMX reflectivity values at different elevation angles. The NEXRAD KAMX and GPM KuPR reflectivity volume scans are projected on to a common Cartesian grid to minimize the uncertainties and the data sets with different resolutions are interpolated to a horizontal grid of spatial resolution 0.1° ×0.1° approximately 11×11km and to have a better agreement both the data sets are quality controlled by considering the reflectivity values greater than 20 dBZ and are cross validated by calculating RMSE (Root Mean Square Error), MAE (Mean Absolute Error) and CC (Correlation Coefficient).