. Aerial photo restitution (orientation, recording, mapping) 
. Test (instrument functions including grid model evaluation) 
. Strip triangulation program STRAUS with grid and control 
point mapping 
Besides, & text diskette can be supplied containing the 
latest version of the operating instructions in German or 
English, 
3. Operating means 
The interpretation of photogrammetric photographs can at 
present be automated only to & low degree. Therefore the 
operator cannot be replaced in stereoplotting, He views 
the partial images of stereopairs using optical means for 
image separation. His efficiency is decisively impaired, 
when interruptions are permanently enforced by manual input 
operations on a video terminal, Although it is in principle 
possible to implement all operating functions with the 
standard and function keys of a video terminal, special 
operating means prove to be expedient. This is especially 
à double foot switch, with which the operator can release 
instructions without interrupting the stereoscopic viewing. 
The measuring points are allocated to two groups or two 
states (e.g. pen up/pen down) and the possibility exists 
to group measuring points into measurement series, whose 
beginning or conclusion are identified by using the second 
foot switch. Thus, the operator can process en bloc objects 
of the same kind (e.g. buildings) with a fixed sequence 
of mapping instructions (rectangularity, parallelism, 
hachure) and hence get along without the operation of the 
video terminal for a longer period. Two different acoustic 
signals acknowledge the input functions. In photogrammetric 
data acquisition there is normally a great number of object 
features, of which some combinations occur particularly 
frequently. This will also correspond to a specific sequen- 
ce of drawing commands, which are expediently summarized 
into macro instructions. Operating means are also necessary 
to provide the possibility for the operator to change 
frequently between these macro instructions without necessi- 
tating a larger equipment outlay, A menu may for example 
be displayed on the screen without additional hardware 
and the operator chooses the desired instruction sequence 
with a character key or in the case of a lower number of 
macros with a function key. An advantageous solution, in 
which the cartographic symbol to be represented is used 
for the designation of macros, is obtained when a programm- 
able additional keyboard is employed, for which standard lay- 
out symbols can be stored in the computer and called up. 
Each standard leyout requires a corresponding mask to be 
made for the additional keyboard. For a very large quantity 
of cartographic symbols a digitizing table may be used, 
within which the operator positions a cursor in a field. 
Here agein special masks are used for different mapping 
tasks and scales. 
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