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 3. Caerlaverock Study Area 
Differences 
-30 to -25 
-25 to -20 
-20 to -15 
-15 to -10 
-10 to -5 
-5 to 0 
0 to 5 
5 to 10 
10 to 15 
15 to 20 
20 to 25 
25 to 30 
  
Fig 3a. . Difference between ASTER v2 and OSGB heights in Caerlaverock area. (Green pixels are nose win posiuve or negative 
differences > 3 x RMSdifferences) 
   
   
     
  
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Fig 3b. Topographic map of Caerlaverock — an area of salt-marsh and pasture, without steep slopes. 
  
  
  
  
  
  
  
  
  
  
  
  
  
500-4 0 Si YI 9j v ol a! eg voi qq m 9 : En: à 
HN Y : - oT 9 6 055 Fig 3c. Histogram of Differences, Caerlaverock, 
«no between ASTER v2 and OSGB terrain models 
Largest negative diff./error: -30.7m 
3007 Largest positive diff./error: 39.9m 
Mean difference: 0.4m 
200+ RMS diff. 8.8m 
1004 
D 5 
  
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-30. 79499924 «1312499905 4 550001144 22 22500134 39 900 
282