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International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B7. Istanbul 2004 
Interferometric Data 
  
  
  
  
   
  
   
   
   
  
    
Track / Frame: 406 / 989 
Ascending orbit 
Master: ERS-1 21-Aug-1995 
Slave: ERS-2 26-Aug-1997 
736 days apart 
Perpendicular baseline: 4.5 m 
ook 
EL 
ERS Tandem DEM: § 
Master: ERS-1 25-Sep-1995 
Slave. ERS-2 26-Sep-1995 
Track / Frame: 406 / 989 
Ascending orbit 
    
  
cm vertical change 
z1.6 
1.1-15 
01-10 
-04-00 
-0.9 - -0.5 
-1.4 - -1.0 
-1.9--1.5 
-24--20 
-29--25 
-34--30 
-3.9--3.5 (b) 
  
  
< -4.0 Deformation values ^ oe 
are only shown where 
scene coherence exceeds 0.5 
  
    
Py ^. LAM. 
~.? - - Lu. 
X ^" por Mee a ndi rid ». v^ 
  
Figure 1. Vertical surface deformation map, generated from differential SAR interferometry (a). Result is draped over a high- 
resolution elevation model (b). Corresponding coherence image (c), and field photographs (d-f). The deformation is 
located towards the bottom of the slope, just above a coal seam. 
571