170 
  
  
    
   
   
   
   
     
    
  
    
   
    
    
    
    
    
   
   
   
   
   
    
    
   
   
   
     
   
    
  
  
   
  
  
     
deviations of adjusted image and object coordinates and of photo syste 
orientation parameters. Any number of these graphic segments can Graph 
be selected for any component of the photo block and transmitted ; netwo 
| to the Tektronics terminal on demand.- Once in the terminal's accom 
| memory, the user has the facility to display any selection of neede 
these segments on the screen. He can also manipulate their 
placement, scale, and rotation, to compose a graphic of a 
selected part of the aerotriangulation adjustment results. 
Observation 
In the course of building an experimental system for online 
display of network adjustment results, two state of the art 2. 
technologies were closely examined. The first of these technolo- 
gies is data base management systems represented by Model 204 
software product. . The second is intelligent graphic terminals 
represented by the Tektronix 4114A product. 
There are several remarks that are worth reporting about DBMS: 
(a) Commercially available DBMS are designed and implemented to 
serve primarily business-type applications. This usually results 
in systems which are strongly biased toward optimized handling of 4. 
character-type data. Searches which are based on numerical 
values are often cumbersome and performed inefficiently. This 
fact must be considered when designing the data definition for 
the data base and when formulating retrieval procedures 
(D) Report-wri ting capabilities are usually available, 
Facilities to perform complicated computations in the course of 
report generation are limited and difficult to implement. In the 
present experiment, host language interface [4] was used to 
support the generation of the necessary reports. (c) The 
efficiency with which Model 204 performs retrievals is remark- 
able. "Naturally this efficiency is closely related to the design 
of the data base and the selection of the query fields. 
Intelligent graphics terminals are very fle le 
tools which can provide economical means for obtaining, on 
demand, graphics of considerable complexity. Local intelligence 
assists human interaction during the composition of grapnics from 
relatively simple primitives. The range of possible compositions 
are only linited by the resolution and size of the display area. 
Programming is considerably simplified due to the availability of 
human interaction to perform the very hard to anticipate logical 
decisions. 
Conclusions 
On demand graphics of network adjustment results are invaluable 
means to communicate to the user the status of the complicated 
computational process, . The range cf graphic elem ments offered by 
th an can be expanded without any alteration in the basic