2. THE DEVELOPMENT OF A DIGITAL 
PHOTOGRAMMETRIC WORKSTATION: THE CONTEXT MAPPER 
2.1 System description 
Designing a photogrammetric workstation one has to consider 
three major tasks, a system should be able to work on 
(see Fig. 1): 
Photographic 
Digital 
Inages 
Inages 
"T~ 
J Diqital 
Ortho- 
{|Map Data 
photo 
Perspective 
Views 
[Digitizer) 
[Scanner] 
Hap to be 
Updated 
1 
(Penplotter) l FU " “ r H 
BÏsj 
For Photo 
Copying 
For Offse 
Printing 
3 
Figure 1: The CONTEXT MAPPER System 
- MONOPLOTTING 
Monoplotting means a map revision system where digi 
tized aerial photography or satellite imagery is transformed 
to the relevant map projection system and scale taking 
elevation differences into account (Ref. 4). 
- STEREOPLOTTING 
Stereoplotting enables the 3-dimensional evaluation of 
stereoscopic image pairs, automatical or operator assisted 
with the ability of stereo viewing of the model. In the 
current prototyp this is realized by two image processing 
displays being viewed by a stereoscope with freely 
movable images and fix floating marks. The operation of 
the workstation is controlled with a mouse and pop up 
menus (Ref. 3). Some of the main features of the 
stereo workstation are: