125 
their visibility (these fragment may be shielded with 
relief or on-ground objects) 
3) Using only selected “favorable” fragments (more 
accurate their projections into the photo planes) the 
stereo model is produced, which now is free from 
miscorrelation problems. Of course such a model is not 
full, because it is made up from the fragments. But it is 
not a problem within this approach, because the model 
has only auxiliary meaning contrary to classical method. 
4) After that the produced during the previous stages 
model is finally orientated relatively laser DTM, that 
corresponds its orientation in geodetic space. Naturally, 
the orientation of each frame is implemented also. 
As already mentioned the presence of GPS principal 
point coordinates of each photos is strictly determines 
the stereo pair position in space with only one free 
angle of turning around survey basis vector. So the 
final true stereo model orientation relatively to DTM may 
be done by minimization of spatial misalignment 
function for both these surfaces. This may be 
calculated with R.M.S. method, for example. 
CONCLUSION 
The conclusions of the present work have only passed 
the very first experimental testing. The nearest plans 
include creation of complete photogrammetric PC 
oriented software package providing the entire set of 
algorithms for visualization, topologic and 
photogrammetric integral processing of laser and photo 
data in digital mapping. Such package appearance 
would symbolize a quality step of the presented 
technology from experimental phase to actually 
productive. 
References 
Lithopoulos, E., and B. Reid, J. Hutton, 1999. Automatic 
sensor orientation using integrated inertial/GPS direct 
georeferencing with minimal ground control. GIM 
International, Vol. 13, Number 6, pp. 58-61. 
Medvedev, E., 1999. Complete aerial monitoring during 
designing of power transmission lines and other civil 
works. Proceedings of the 4th International airborne 
remote sensing conference and exhibition/ 21st 
Canadian symposium on remote sensing, Ottawa, 
Ontario, Canada, Vol. 2, p. 615. 
Murtagh, J., and M. Foote, 1999. A practical application 
of laser scanner data in the insurance industry. 
Proceedings of the 4th International airborne remote 
sensing conference and exhibition/ 21st Canadian 
symposium on remote sensing, Ottawa, Ontario, 
Canada, Vol. 1, pp. 582-588. 
Piwowar, J., and P. Howarth, , E. Lindo , 1999. An 
accuracy assessment of a digital elevation model 
derived from an airborne profiling laser. Proceedings of 
the 4th International airborne remote sensing 
conference and exhibition/21st Canadian symposium 
on remote sensing, Ottawa, Ontario, Canada, Vol. 2, 
pp. 726-731.