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International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B4. Istanbul 2004 
The exact needs for investments and training will be determined 
in function of the chosen hard- and software for every stage of 
the updating process. We foresee to purchase a number of 
pencomputers, GPS-RTK receivers and a DBMS. The data 
classifiers will have to learn to use all these. The training effort 
will be most important for this group. On top of the new 
technology, like all other operators in the production line, they 
should learn to deal with the threedimensional and the temporal 
nature of objects. 
CONCLUSIONS 
We made choices for the updating aspects of the data model and 
determined criteria for choosing the future digital 
photogrammetrical workstations. We wrote a VBA-script to give 
z-values to the structured and identified data. The data and 
especially their accuracy are still being studied in order to define 
the future tolerances. The confrontation of the expected amount 
of work with the available means shows that, on condition of 
investments and training, our total stereoplotting and surveying 
capacity suffice to reach reasonable updating cycles. The exact 
needs for investments and training will be determined in function 
of the chosen hard- and software for every stage of the updating 
process. 
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ACKNOWLEDGEMENTS 
We would like to thank our colleagues at NGI who revised the 
present paper, as well as all colleagues from other National 
Mapping Agencies who shared their experience and their ideas 
with us, especially Thierry Badard and Hakima Kadri- Dahmani 
(France) , Bert Kolk (the Netherlands), Ammatzia Peled (Israël), 
Sue Sleath (England). 
We would also like to thank Claude Hannecart and Yves 
Lardinois (CIRB — Brussels) for allowing us to copy some of their 
ideas.