Nem
The most significant options that are available during data
adjustment are:
e classical block adjustment (separated horizontal-
height adjustment) with at least two iterations,
e robust block adjustment using Danish method for
detection of large gross errors (Krarup, 1983)
e selective "Data Snooping" as a method for detection of
small gross errors (Foerstner, 1984)
e efficient data adjustment
e graphical representation of the following results:
e vectors of corrections,
e structure of the banded matrix of reduced normal
equations
e disposition of the points and models within block
(Figure 3) etc.
e elimination of observations from adjustment with
limited adjustment, etc.
PREGLED RASPOREDA SNIMAKA U BLOKU
Blok: UZICE Duzine : 1000 m
A
Figure 3 : Disposition of the points and models in block
On completion of the adjustment and accepttance of the
results, the software enables:
e transformation of coordinates for object points
measured during measurement of independent
models,
e calculation of final elements of absolute model
orientation considering different types of analog
instruments,
e sorting of points according to map sheet division, etc.
The final conception of the software system was established
in 1989. Version 2.3 from December 1991 is currently in
exploitation. Installation of the software system occupies
5Mb, of which 4Mb is for executables. All programs works
under MS DOS in real mode.
4.3. MapSoft software system
Digital photogrammetric restitution is a crown of the
development of the computer aided support to analog
photogrammetric instruments. Considering that in
Yugoslavia in 1991 there were no practical experiences in
the field of digital cartography, it was not possible to solve
the problem of the digital photogrammetric restitution
separately. In other words, if digital technique would be
used only in photogrammetry, and the other participants in
technological process (cartographic editing, parcel area
calculations, map reproduction, map maintenance within
cadastral units, etc.) would still use analogue technique,
then the results would be incomplete. Therefore, in the
middle of 1991, the concept of the Digital Geodetic Map
(DGP) was established in Yugoslavia. The DGP was
imagined as a system composed of three vital components:
data base, software and hardware. Data acquisition,
processing, analysis, handling and maintenance of the
geodetic map contents were the main purposes of this
system. Software support to this system was named
MapSoft.
The MaSoft is a software system which is designed for all
participants in a technological process of geodetic map
production and maintenance, as well as for various map
users who have based their activities on geodetic maps as
spatial data sources. The basic software conception is
shown on Figure 4. All methods of digitization have been
supported. Digital photogrammetric restitution takes the
central position.
Figure 4 : Basic conception of the MapSoft
The most important functions supported within restitution
are:
e ondine transformation of model coordinates to object
coordinates;
e data acquisition for DGM horizontal representation
with automatic assigning of graphic and layer
attributes and creation of topology;
e DTM data acquisition:
e measurements of spot heights, profiles and grid,
e contour digitization using the following criteria:
distance, time, curvature (tube) and combination of
the previous ones,
e digitization of structure lines with automatic creation
of topology;
248
International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B2. Vienna 1996
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