Perski, Zbigniew 
  
In the test area in Katowice city (Figs. 1 and 2) the comparison of the retardation distance measured between position 
of mining front and the centre of interferometric fringes with the adjacent rate of mining advance shows that the 
influence of mining was observed on the surface already after 3 to 4 months. Such a short time of impact can be 
explained by the relatively shallow exploitation, the presence of 50-m-thick Quaternary deposits in the Rava river 
valley and already existing damages of overlying rocks caused by old abandoned workings. In the presented 
interferograms of Muchowiec Airport in Katowice the observed fringe pattern shows in 1993 very clear asymmetry in 
northeasterly direction. This part of interferogram represents an effect of residual subsidence caused by works abandoned 
in 1991 and 1992. The rate of monthly subsidence in presented period was here 2 to 0.5 cm per 35 days. 
  
  
  
     
KATOWICE CITY 
MUCHOWIEC AIRPORT 
    
ERS-1 limage and location 
SPOT IMAGE 
   
    
  
  
     
  
BE ew of underground exploitation 
ERS SAR INTERFEROGRAMS 
35 days 70 days 
es not N 
a 
ffects e 
been 
phase 
lines 
been 04.10.92 - 08.11.92 08.11.92 -13.12.92 04.10.92 - 13.12.92 
lantis 
using 
ISAR 
eight 2 
n the = 
been 
> and 
03.09.93 - 08.10.93 08.10.93 - 12.11.93 03.09.93 - 12.11.93 
EXPLANATIONS 
ment 
> - an en Lacie ofthe songe 
. in coal seam nu r % 
ding © 
'json o 
rate a, 
Extent of Spicy fields 
oal i 
arate on the depth 700 m (black) 
ating 
Location of the mining front 
SAR S Cen re RS o 04.07.95 - 12.09.95 
lence Extent of explaitation fields in coal seam no.501 
on the depth 300 m (white) 
Figure 2. Katowice area InSAR images with associated underground coal exploitation 
  
International Archives of Photogrammetry and Remote Sensing. Vol. XXXIII, Part B7. Amsterdam 2000. 1139