Xiunguang Zhou 
  
The shaded-relief image was created using the Lambert photometric function (X. Zhou and E. Dorrer, 1995). 
Considering that the albedo is assumed constant in the shaded-relief image and the limitation of the Lambert model, the 
two images are quite similar. It is an overcritical method to verify the quality of the DEM by comparing its shaded- 
relief with its original image. 
There are some errant points in the DEM (in the right area of the DEM), which can be seen in the shaded-relief image. 
The errors come from unmatched points. Errors such as these can be easily removed if an interpolation is used in the 
DEM generation like the usual way. An interpolation was not performed in this case to show the high accuracy and 
detail possible using this technique. 
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Properties. Proceedings of ISPRS Congress, Vol XXXI, B3, WG II/2, PP.1028—1035 
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1062 International Archives of Photogrammetry and Remote Sensing. Vol. XXXIII, Part B3. Amsterdam 2000. 
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