Figure 1. GUAN Ground based GPS stations as of February 2021 as recorded by ECMWF. Stations that contain both daytime and nighttime data are denoted by green crosses, whereas daytime-only stations are denoted by red diamonds, and nighttime-only stations are denoted by blue triangles.

From

Atmospheric Water Vapour Determination Using Gps Signals for Numeric Weather Prediction in Tanzania

Mlawa, A., Saria, E. E

Journal of Geosciences and Geomatics. 2023, 11(3), 88-96 doi:10.12691/jgg-11-3-3