/ith 
out 
ard 
of 
ind 
ver 
tter 
wn 
ing 
ing 
and 
to 
ing 
rial 
ure 
ing 
en 
rite 
ate 
its 
e is 
eck 
ion 
hey 
ere 
are 
vith 
for 
hat 
oun 
per 
one 
zer 
ject 
tial 
on 
- computing measured coordinates of 
zones from digitizer coordinate system 
to coordinate system of photographs; 
- computing of coordinates of 
zones'centres relatively the principal point 
of photographs ; 
- computing and transfer of homologe- 
ous points coordinates from common 
photo to next photos for forward and 
lateral overlaps. 
When the work with a digitizer is finished, 
the following files in chosen directory are 
open: HEADLINE (*.prJ) and NUMBERS 
OF COORDINATES (beg.*), containing 
numbers of photos , quantity and numbers 
of points and their coordinates. When 
project designing is finished these files are 
removed to the directory, where works on 
STEREOANAGRAPH analytical plotter will 
be carried out. 
2.2. Measuring of stereopair 
coordinates 
This process is the main one in the new 
technology. Differently from the 
technology, used at enterprices it allows 
to realize a digital transfer of tie points and 
exclude both the process of artificial 
marking and essential expensive 
equipment: point marking instrument PUG 
(Swiss),  Transmark and Interpretaskop 
(Germany), NT and DSI (Russia). 
A STEREOANAGRAPH analytical plotter 
permits to get higher instrumental 
precision of measurings till 3 mkm and an 
automated process for driver of floating 
marks to zones of stereoviewing 
(observed) points, process of coordinates 
point transfer, processes of recording and 
numbering of points, checking of errors on 
all steps of photo measurment . 
The core of new technology is a procedure 
of measuring of separate stereopair. To 
avoid frequent repetition of this procedure 
439 
  
  
data for adjustment of strip network were 
formed. In turn photogrammetric block 
includes totality of the strips. There is a 
special feature for tie points of lateral 
overlap in the new technology. The points 
of lateral overlap (that at the same time are 
tie points in forward overlap) finally were 
calculated during process of mesuring of a 
previous strip. To begin the next strip it is 
necessery to transfer tie points from 
stereopair of previous strip. 
Interior orientation of stereopair 
(diapositives) is carried out for reformation 
of coordinate system during digital point 
transfer and computing of coordinates of 
the principal point of photos. The 
procedure is carried out semiautomaticly. 
Carriages of the analytical plotter are 
reached automaticly to zones of all fiducial 
marks. 
First, an operator- revolving manual 
Steering-wheel combines the floating mark 
with a fiducial mark on the left photo, than 
on the right one . After that he records 
measuring coordinates as it was said 
above. Process of fiducial marks mesuring 
is rather important because all processes 
suches like digital point transfer and block 
adjustment's accuracy for spare networks 
depend on accuracy of their measuring. 
Choice and measuring of point coordinates 
are carried out under control of data file of 
project designing. Software controls 
succesively approaches floating marks to 
centres of zones on the left and riglt 
photos, marked on contact paper photos 
during the project designing. Viewing the 
centres of zone, an operator selects 
points for bridging. 
Maybe an operator with some causes will 
not choose the same point, that was 
selected in the project and it will situate 
out of marked zone. It is only possible if 
there is an additional checking of its 
image on neighbouring photos on zones 
of forward and lateral overlaps. Order of 
measuring of a stereo pair point on the 
left and right photos with stereo veiwing is 
International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B2. Vienna 1996