| Summary: | Signals from Global Navigational Satellite Systems
(GNSS) when integrated with surface meteorological
parameters can be used to sense atmospheric water
vapour. Using gLAB software and employing precise point
positioning techniques, zenith troposphere delays (ZTD)
for a GPS base station at KNUST, Kumasi have been computed
and used to retrieve Precipitable Water (PW). The
PW values obtained were compared with products from
ERA-Interim and NCEP reanalysis data. The correlation
coefficients, r, determined from these comparisons were
0.839 and 0.729 for ERA-interim and NCEP respectively.
This study has demonstrated that water vapour can be
retrieved with high precision from GNSS signal. Furthermore,
a location map have been produced to serve as a
guide in adopting and installing GNSS base stations in
Ghana to achieve a country wide coverage of GNSS based
water vapour monitoring.
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