ground control points derived from topographic maps or from
GPS measurements. In many cases the detailed analysis is
possible only for relatively small area.
CONCLUSIONS
Preliminary results of presented work show clearly that
subsidence in the Upper Silesian mining area can be detected
and measured using interferometric processing of ERS SAR
data.
The 35-day interferograms present a pattern of the fringes
which can be interpreted as the changes caused by the mining
subsidence. The spatial distribution and amount of the fringes
well corresponds with location and extension of the active
mining zones. During 35-day interval observations the
displacement of 1-4 fringes (i.e. 3 to 12 cm) was detected. This
value well corresponds with mining. data and geodetic
measurements (Kwiatek 1997). The detailed interpretation and
the comparison with ground measurements are currently done.
The comparison of interferograms from different years (1992,
1993) .shows that:
- Surface changes during 35-day are similar: 1 to 3
fringes
- The locations of the areas affected by changes are well
corresponding with active mining zones and follow
mining fronts.
- On interferograms from different years were observed
the shift in location, difference in shape and in value of
changes (number of the fringes).
For a continuation of this study a proposal for the 3rd
announcement of opportunity for exploitation of ERS data has
been submitted. The new projéct aims to provide long-time
monitoring of surface changes in Upper Silesian Coal Mining
Region using SAR interferometry in conjunction with mining
activity data. The scope of this project is to bring InSAR
towards to operational application.
ACKNOWLEDGMENTS
The author gratefully acknowledge the European Space Agency
and European Space Research Institute for supporting and
sponsoring this research and supplying the ERS SAR data and
inerferometric software. The special sincere thanks to dr. Juerg
Lichtenegger for his constant encouragement, supervision and
guidance.
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