anticipated that transportation to other chosen systems, e.g. 
UNIX based systems, will be equally straight forward. 
Kern, and users of Kern equipment, will keep building upon the 
wide range of available program packages and continue 
implementing the newest technology into the software in a fast 
and efficient manner. 
11. Conclusion 
Kern's philosophy for the design of photogrammetric software 
systems has proven itself to be a sound approach. 
Once a basic set of tools for software development had been 
established, programming and software maintenance could be 
carried out very efficiently. A large selection of software 
is available, and maintained, for Kern equipment, based on a 
variety of computer hardware. Also, with many DSR installations 
world wide, experience has shown that photogrammetric operators 
very quickly master the software once a few basic instructions 
are explained, and the system can rapidly form part of the 
customer's production line. 
New versions of Kern software, computer operating system and 
new computer hardware have not required operator retraining, 
except to point out additional new features. Both Kern and many 
customers have successfully changed operating systems for newer 
versions or migrated from RT-11 to VAX/VMS. Similarly, the PDP 
computers have been upgraded as new technology appeared on the 
market or changed for MicroVAX hardware. 
Kern equipment users feel assured that they have made the 
correct decision in their choice of the Kern Photogrammetric 
System as they can upgrade and expand the system as required to 
suit their particular needs of the moment, and any previous 
investment of money and manpower is still valid with the most 
current technology. 
22