PO 
Surveyor and Soil Testing Company (FTI), 
National Forestry Service, 
Hungarian Army. 
The instrument pool of these organizations is, of 
course, quite different. The planar photogrammetry 
instruments are of the SEG-V, SEG-I, and Orion-IV types, 
while the spatial photogrammetry instruments include 
several types such as stereometrograph, stereoplanigraph, 
A-7 autograph, A-8 autograph, SzPR-2 (Romanovsky), and 
some stecometers. 
3. Photogrammetric densification 
Hungarian practice employs analogue series triangulation 
based on the A-/ autograph; the lines are fitted into 
the geodetic co-ordinate system by simultaneous block 
compensation, according to the principle of the Schut 
conform transformation technique. Densification is 
employed, first of all, in large scale (1:1000, 1:2000) 
mapping, where it substitutes low order triangulation 
and traversing. This way the preset and stabilized 
points of the terrain are given co-ordinates by photo- 
grammetry. Such work does not require the precise de- 
termination of the altitudes. Further fields of appli- 
cation are the special surveys (for road, railway, 
industrial establishment design, etc), and 1: 10000 to- 
pographic mapping. : | 
Block compensation employs a Hungarian technique(Molnár, 
L., 1969) realized as a system consisting of 5 successive 
and one detail calculation programs, by using a GIER 
computer. Its characteristics and peculiar features are: 
1. Fundamental compensation: 
I. - (a) Interconnection of the lines by serial 
linear plane transformation 
(b) Determination of the block scale by the 
square root of the sum of squares of the linear plane 
transformation constants obtained on the basis of the 
minor control points, as interpreted for the entire 
block; 
2442/87,