1egative 
rock, 
  
International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Volume XXXIX-B4, 2012 
XXII ISPRS Congress, 25 August — 01 September 2012, Melbourne, Australia 
Figure 4. Wicken Fen Study Area 
-6 
B10 -5 
-5t0-4 
-4to -3 
[wz 
[lem 
[.— ]-100 
[Time 
[4 to 42 
[77] 1t 4 
43 to 44 
44 to 45 
   
  
  
  
  
   
  
45 to +10 
+10 to +20 
+20 to +40 
Figure 4a. Difference between ASTER v2 and OSGB heights in Wicken area. (Green pixels are those with discrepancies > 3 x 
RMSdifferences) 
$ 
x 
Bw rie ee at ut m 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
      
Figure 4c. Histogram of differences between ASTER v2 
and OSGB terrain models, Wicken Fen area. 
Largest negative diff/error: -6.0m 
Largest positive diff/error: 30.3m 
Mean difference: 4.9m 
RMSE: 3.9m 
  
pr Eqs ad 1 
Figure 4b. Topographic Map of Wicken area (extremely level, 
low-lying - some, Soham Mere - below sea-level), arable and 
residential terrain) 
283