Performing the pit identification procedure on whole 
dataset one more time, the procedure detects some 
sporadic pits, mostly without significant impact on the 
DEM surface. These pits are present because of 
interpolation and rasterization process, and mostly have 
no significant depth. The final result after interpolation 
with pitpaths included as formlines is shown in picture 
below. 
Fig.8. The visualisation of the whole test area after pit removal process. 
5. Conclusion and further perspectives: 
As we have seen, the water (low analysis can 
significantly improve the DEM in geomorphological 
sense. 
Statistical methods of preprocessing and interpolation are 
well suitable to filter out the points that do not lie on the 
terrain and to minimize random errors. Thus interpolated 
surface will pass very closely to original terrain, but if we 
expect that interpolated surface satisfies some 
geomorphometric constraints, they have to be included 
into interpolation. Pit processing procedure, shown 
above, is only a simple way to include geomorphometric 
constraints into interpolation. 
The results are promising, although the pit removal 
algorithm introduced here shows dificulties in areas 
where pits really exist and should remain included in 
DEM, too. This problem leads to be solved at the 
preprocessing phase where the clasification of pits should 
be done. This clasification should be performed 
according to the size of a pit and to average penetrating 
rate of laser beam. After clasification, the big pits should 
be masked out for further processing. 
Further, the drainage lines (rivers) detection, and 
including it into interpolation could significantly improve 
geomorphological consistency of DEM. How derived 
rivers can impact interpolation of DEM will be 
investigated . 
The pits identification and processing algorithms are 
realised by means of softvare MATRIX (developed by 
Dr. Wolfgang Rieger), and will be included into SCOP- 
XX framework as a module named HYDRO. At this 
stage this module does some more analysis about water 
summation, rivers and catchbasins identification, but is 
still being developed.