Abstrakt
Time series of weekly and daily solutions for coordinates of permanent GNSS
stations may indicate local deformations in Earth’s crust or local seasonal changes in the
atmosphere and hydrosphere. The errors of the determined changes are relatively large,
frequently at the level of the signal.
Satellite radar interferometry and especially Persistent Scatterer Interferometry (PSI) is
a method of a very high accuracy. Its weakness is a relative nature of measurements as
well as accumulation of errors which may occur in the case of PSI processing of large
areas. It is thus beneficial to confront the results of PSI measurements with those from
other techniques, such as GNSS and precise levelling.
PSI and GNSS results were jointly processed recreating the history of surface deformation
of the area of Warsaw metropolitan with the use of radar images from Envisat and Cosmo-
SkyMed satellites. GNSS data from Borowa Gora and Jozefoslaw observatories as well
as from WAT1 and CBKA permanent GNSS stations were used to validate the obtained
results. Observations from 2000–2015 were processed with the Bernese v.5.0 software.
Relative height changes between the GNSS stations were determined from GNSS data
and relative height changes between the persistent scatterers located on the objects with
GNSS stations were determined from the interferometric results.
The consistency of results of the two methods was 3 to 4 times better than the theoretical
accuracy of each. The joint use of both methods allows to extract a very small height
change below the level of measurement error.
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