51
INTERNATIONAL SOCIETY FOR PHOTOGRAMMETRY AND REMOTE SENSING
COMMI SSI ON 11 SY MPOSI UM
SEPTEMBER 8-12,1990
DRESDEN, GDR
ANALPRET Computer Assisted and Controlled Plotter
for Teaching and Interpretation
M. G. Gerencser, Prof. Dr.
College for Surveying and County Planning
Szekesfehervar, Hungary
Introduction
If the technical niveau of eastern and western
photogrammetric laboratories at the Universities are compared
the differences are sometimes shocking. Although the computer
age knocked at the door of plotter rooms in eastern part of
Europe in form of cheaper PC’s as well, the analytical
plotters remain unaccessible for most of them because of
f i nanci al s.
The way for them stayed the digitalisation of classical
analog plotters but first of all mono and stereocomparators
in order to demonstrate the advantages of on line data
reduction with application of special measuring programs.
Our Institute has also followed this way. The good old
Zeiss Steco 1818 Stereocomparator was attached with circular
encoders in X, Y and PX axes having coordinate counter in a
separate box. For the measurement and control of PY a
stepping motor was attached to the comparator and the
necessary control boards were built into the computer. This
simple configuration makes it possible to enter the plotter
coordinates into the measuring programs, realizing human
friendly stereo vision at least for the observed homologous
points. If the plotter is supplemented with usual graphical PC
peripheries, the teacher can build up an expanded developing
environment which is achievable within restricted budget.
Our Dept of Photogrammetry went through this way and
at last won an application for a project to build a low cost
system, sponsored by the Remote Sensing Program Office at the
Ministry of Industry.
During this two years period the Analpret has been
planned and the experimental type has been built which
usually proceedes the prototype.
Although the experimental stage of this modest development
has not been finished yet, we can summarize the concept of
this plotter and the first measuring results.
