stanbul 2004 
nages (right 
=10] x| 
  
ID] x] 
  
  
  
stereo pair 
  
International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part Bl. Istanbul 2004 
The outlook of scanned TK-350 satellite stereo images is shown 
on Figure .4. 
  
Figure 4. The outlook of scanned TK-350 satellite stereo 
images 
As geodetic basis there were used 80 control points obtained 
from the provided maps (for orientation of SPOT-5 images) and 
29 phototriangulation ground control points for TK-350 images. 
Both types of DEM were produced in UTM projection on 
WGS-84 ellipsoid using software technological modules of 
digital photogrammetric systems Z-Space v.2.0 (Institute of 
Information Technologies, Moscow, Russia) and Photomod 
v.3.6 (Racurs Company, Moscow, Russia). At first, on both 
digital systems there were produced computer versions of DEM 
in automatic mode using digital correlators. Then both versions 
of DEM were corrected by operators using software interfaces. 
    
  
  
  
  
  
  
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Figure 5. The relative location of the control points from maps 
in the block 
3. DESCRIPTION OF DIGITAL 
PHOTOGRAMMETRIC SYSTEMS 
System "Z-Space" is used for production of DEM and 
orthoimages from satellite stereo images TK-350. The system is 
constructed using modular principle. The following is a list of 
software modules as well as technological processes and 
functions implemented by them. 
1. Project Manager — head module of the system 
  
or opening (saving, copying) of an existing 
project 
  
Forming of project file and data files in 
appropriate formats on hard disk 
  
Input of project parameters in dialog or from 
files 
  
Creation and holding of imaging systems catalog 
  
Creation and holding of catalog of coordinate 
systems, ellipsoids and map projections 
  
Control of project state 
  
Setting of options of graphic elements display 
  
Conversion of raster and vector data 
  
Creation and holding of list of models for DEM 
construction 
  
  
  
Start of separate modules for current project 
  
2. Orientation 
  
  
  
  
  
  
Process Function 
Interior Interior orientation of images 
Relative Relative orientation of images 
Exterior Exterior orientation of images 
  
3. Rectification 
  
Process Function 
  
Rectificatio | Epipolar rectification of images (fragments of 
n stereo pair) 
  
  
Cutting of fragments of stereo pair 
  
  
4. Production of DTM 
  
Process Function 
  
Make DTM DTM production 
  
  
  
EditDTM Automatic editing of DTM 
  
5. Stereo Editor 
  
  
  
  
  
Process Function 
Stereo Browsing and editing of stereographic elements 
Editor 
Manual editing of DTM 
  
6. Orthophoto 
  
Process Function 
  
  
  
Orthophoto | Orthophoto production 
  
  
Process Function 
  
  
  
Project Selection of name, creation of new project folder 
  
  
461 
Separate modules of the system can be started through Manager 
or independently by Windows. 
Architecture of digital system “Photomod” includes analogous 
technological modules and additional modules PHOTOMOD 
AT for construction and adjustment of phototriangulation. All 
the modules work under control of main shell of PHOTOMOD 
system Montage Desktop. 
The main module PHOTOMOD DTM is used for production of 
DEM. The obtained computer variant of DEM is edited by 
operator in stereomode by separate and group correction of 
nodes and triangles of TIN model, by smoothing of contour 
lines and break lines, filtration of outbreaks, etc.