Figure 4. The three (3) GNSS campaign networks used in this stuy [Authors]

From

Evaluation of Five Tropospheric Delay Models on Global Navigation Satellite System Measurements in Southern Nigeria

Dodo J. D., Ekeanyanwu U. O., Ono M. N.

Journal of Geosciences and Geomatics. 2019, 7(4), 201-211 doi:10.12691/jgg-7-4-5