With the methods of the digital image correlation, photogram- 
metric data collection can be performed too. For topographic 
and some industrial tasks those methods are just in process. 
The application for aerotriangulation may be possible in the 
future. 
Information in advance - given by a land information system - 
will for shure create better results. 
3. Data Processing 
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In the meanvhile, interactive-graphic workstations are stan- 
dards for the task of graphical data processing. If there is 
an on-line connection to a photogrammetric stereo restitution 
instrument, editing functions can be helpful during measure- 
ments. But those functions should only allow simple correc- 
tions. Often it seems to be better to set a flag if an error 
was registered. 
The editing functions should be able to handle at least the 
following: 
= delete, move, change and add the basic elements like: 
point, segment, group, level, file 
- delete, change and add attributes 
- delete, change and add text 
- transform different data-files together 
- logical and geometrical search for data 
Every additional function is a step into independency as a 
stand-alone workstation for smaller tasks. Those functions 
are: 
- process and compute transverse sections 
- annotate maps with (quasi) measured data 
= display of data in any view 
- three-dimensional view of special linemaps 
- selection of DTM points 
- three-dimensional view of the terrain surface 
- generalization into other mapscales 
- integration of any data 
The processing of data which are collected by photogrammetric 
methods in stand-alone workstations is the more meaningful the 
more extensive the whole system is. In the case that all data 
are in a troublefree condition, they should be sent to the 
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