2, Photogrammetric instruments 
  
Photogrammetric plotting, and the manufacture of photogrammetric products 
are being operatively dealt with by 6 companies in Hungary: Budapest Geodetic 
and Cartographic Co /BGTV/, Cartography Enterprise /KV/, Geodetic and 
Cartographic Co of Pécs /PGTV/, Surveyor and Soil Test Co /FTV/, the 
National Forestry Service, and the relevant organization of the Army. The 
medium and high -grade educational institutes also work with a number of 
different photogrammetric instruments, 
The instrument pool of the individual companies enumerated above is very 
much different, including SEG -V, SEG-I, and Orion-IV rectifying photo - 
grammetric units, while the plottig instruments of stereo -photogrammetry 
enlist Stereometrograph, Topocart-Orthophot, Stereoplanigraph, Technocart, 
A-7 Autograph, A-8 and A-9 Autograph, PG-2, some SzPR-2, anda few 
Stecometer units, 
3, Photogrammetric control densification 
  
Hungarian practice employs in general analogous strip triangulation based on 
the A-7 Autograph, The plotting instruments equipped with recording unit 
perform semi-analytical and in-model densifications as well, while the stereo- 
comparators conduct analytical densification, The computation program 
elaborated for the latter constructs strips from models as early as in the very 
first step. 
The field of application for photogrammetric control densification is, above all, 
large scale mapping /1:1000, 1:2000/, where it may replace lower order 
triangulation and traversing; the signalzed and stabilized fix points of the 
terrain are given co-ordinates by a photogrammetric process. Other fields 
of application include special surveys like road planning and design, railway 
surveying, preliminary plans of industrial establishments, etc, and 1:10000 
topographic mapping. 
The photogrammetric point field is fitted into the geodetic system by electronic 
computer programs, For adjustments a number of Hungarian programs are 
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