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2.4. Digital point transfer for lateral 
overlap 
For formation of a block it is necessery to 
provide a photogrammetric tie between 
neighbouring strips prepared 
independently. When artificially marked 
points are absent, tie of the strips is 
realized with a method of digital marking 
by transfer of measured coordinates of 
points for lateral overlap from one strip to 
another. 
Tnis process is very different from a similar 
in techology with artificial marking of 
points. In a basic technology all strips 
become independent after marking. In 
digital marking, coordinates of points for 
lateral overlap are defined only after their 
fixation in previous strip .That is why strips 
must be prepared consecutively one after 
another. 
There is a difference of materials which is 
an absence of checking accuracy of 
photogrammetric modelling on this strip. 
Checking may be done only at the stage of 
block adjustment. Laying down of photos 
with lateral overlaps on the carriages of 
analytical plotter ^ and measusing of 
fiducial marks is similar to the written 
earlier. 
Coordinates transfer of homologeous 
points to the strips is realized by the 
method of automatic restoration of 
coordinats meanings of common points got 
in preparation of previous strip and stereo 
viewing of floating mark with homologeous 
points on a photo of neighbouring strip. 
Programe pacage says that a process of 
measuring is up, when quantity of 
processed photos corresponds to 
quantity of photos that must be processed 
by the project. After getting all tie points 
from a previous strip it is necessery to 
measure next one. : 
All results with measuring data enter to the 
441 
o ————— EL LT ee —————— 
STRIP file. Actually forming of data for 
block adjustment is in consecutive carried 
out subprocedure of a strips’ networks 
modelling and transfer of tie points to 
neighbouring strip. Process is stopped 
when measuring of all strips marked during 
of project disigning is fulfilled. 
2.5. Block adjustment 
Quality of block adjustment is valued with 
everage differences of adjusted 
photogrammetric coordinates of control 
points with their geodetic meanings. If 
there are many errors in tie points that are 
situated in triple forward or lateral 
overlaps, it is necessery to correct 
identification of the point number, 
accuracy of its stereoviewing and quality 
of fiducial marks mesurations. It is 
possible to decide a question about errors 
in fiducial marks with values permanence 
of deformation parameters for stereopairs. 
Discovery of errors on control points is 
realized by excluding one after another of 
points, used in adjustment and their 
replacement to another ones ( if it is 
possible). Defective point will be 
discovered, when its replace to anotner 
one or exclud from a process of 
adjustment, will be good. Unadmissible 
errors on control points can spring up after 
errors of point recognizing, errors of its 
stereo viewing, erross of catalogue forming 
or errors got from field geodetic works. 
Analysis and adjustment of block are 
finished with a formation of a bridging 
points catalogue. Results of a digital point 
transfer excluding a process of 
aerotriangulation will be used in future 
steps during stereoplotting by analytical 
plotter. Here in a process of stereoplotting 
for single stereo pairs parameters of their 
relative and absolute orientation got from 
results of phototriangulation are also used: 
it shortens time for their repeat definiton. 
International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B2. Vienna 1996