(7) The presentation of terrestrial stereo image blocks; 
(8) The extension of the optical sharpness within a model 
using different focal lengths for the stereo mates; 
, 
(9) The simulation of the perception of the "natural" 
appearance of the object dimensions; 
(10) The Market potential for stereo imagery 
4. CONCLUSION 
It is liked to emphasize, moving back to the to the Roots in 
spatial data visualization gains a surprising potential for 
advanced practical MIS application, as well as for further 
research, in particular with respect to the third dimension. 
A systematic approach to define research gaps in basics of MIS 
as presented, is highly recommended and stimulates for further 
progress. 
Today real Market gaps for MIS and MIS related close range 
Deliverals only can be seen in connection with digital methods. 
According to this, beside others, for MIS devices mainly the 
following fields for research on basics of spatial data 
visualization are left: 
- The field of 3dimensional visualization for MIS, which is 
still unsatisfactory. So far all systems depend on aided 
eyes. 
- All systems? The progress in Laser based PCs, showing a 
real 3D screen is just in an increasing phase. Currently the 
"3D-tube" using a cylindrical screen, successfully is 
replaced by the FELIX-3D solid state, which for the very 
first time allows autostereoscopic viewing from any side! 
- Still a problem and from that a field for international 
research is the production of line maps and stereo mates 
from digital raster data, though, namely within this field, 
many activities successfully have been carried out. 
- Another big field for international research is, to manage 
the problem of digital interpretation in an efficient way. 
This is of course mainly a question of improvements in 
algorithms and software, which might also include 
tendencies of artificial intelligence. 
- Another field for further research in connection with the 
problem as mentioned before, is the efficient manipulation 
of half tone image raster data to derive sufficient digital 
vector data, representing that area, but requiring reduced 
storage capacity. 
- An additional matter for international research for MIS 
devices is, to solve the problem of multi layer digital 
interpretation in an efficient way. This problem includes, 
e.g., the realistic simulation of propagation. 
Summarizing, improvements namely are expected in modeling, 
software improvement, instrumentation, Analysis and standards 
etc.. (Spatial) MIS of today consequently requires digital 
solutions in order to tackle with the enormous working load, 
like to provide and to maintain MIS products of high quality. 
As a matter of fact, like in all parts of the daily life, the recent 
development in MIS and in the field of spatial data visualization 
in particular, must deal with the world wide web. 
—554- 
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