Fig. 4From: Study on reflectivity data interpolation and mosaics for multiple Doppler weather radarsThe coordinate system for a fixed, ground-based weather radar. Where r is the radial distance, R is the distance between projection points of z plane and radar station, θ is elevation, ϕ is azimuth, and \( {\hat{e}}_{\phi } \), \( {\hat{e}}_{\theta } \), \( {\hat{e}}_r \) are vectors in the direction of azimuth, elevation, and radialBack to article page