The operators responsible for the PRODUCTIVE USE of PHOCUS need only 
little EDP training and no detailed PHOCUS system knowledge. They are 
first of all required to master the application tasks. 
- Use of the P1, P2 or P3 Planicomp analytical plotter for 
topographical data acquisition and editing, for measuring digital 
terrain models, and for photogrammetric point measurement for block 
or model adjustment. 
- Digitization of 2-dimensional data. 
- Graphical data output with drum plotters or precision tracing tables 
as a preparation for map production. 
The project and system environment for the operator is established by the 
PHOCUS project manager. This work requires some familiarity with electro- 
nic data processing (file management, screen editor) and profound famili- 
arity with photogrammetry and cartography. Some project manager tasks are 
listed below: 
- System management (PHOCUS system files, device tables, project and 
operator names). 
- Project installation (user coordinate system, object code table, 
data base). 
- Preparing menus. 
- Establishing graphics tables. 
- Data interchange e.g. with the PE editing subsystem or with other 
information systems 
If trained properly, the operator can perform some or all project manager 
tasks. Introduction to and training in these fields are the subject of the 
training courses integrated in the tuition concept (refer also to section 
4.3). If desired, Zeiss specialists can establish an initial custom project 
and system environment in the field. 
The high functional versatility of PHOCUS opens up a comprehensive range 
of applications in photogrammetry and cartography. Even so PHOCUS is an 
open software system that affords user APPLICATION PROGRAMMING of 
special tasks. This work requires programming experience and computer 
knowhow (HP, DEC). The additional knowledge of the PHOCUS software 
structure (opera-ting system, interfaces, program libraries) is given in 
special courses. 
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