The algorhythmic language Algol- 60 is used by writing the programs of processing the 
information about planimetry and relief, approximation of relief and contour line drawing, compo- 
sition of control tapes for automatic compilation of plans. 
The program of digital relief models composition based on the measurements of air photo- 
graphs is drawn in conformity with measurement by stereocomparators with automatic registration 
of co-ordinates. It is mainly intended for determining the heights of node points of regular net, that 
was done instead of levelling in squares when projecting works on vertical terrain planning. It may 
also be used by surveying of flat country sections, for determining the cornérs of buildings co- 
ordinates and co-ordinates of other municipal and industrial objects, where high accuracy of de- 
termination of their mutual disposition is demanded. 
There are introduced corrections into measured points photographs co-ordinates for in- 
fluence of instrument errors of stereocomparator, distortion of aerial camera lens, deformation 
and unsmoothing of airfilm, refraction and curvature of the Earth. 
The corrections for distortion in its laboratory value are calculated by line interpolating 
between the two closest measured values in two radial directions, the point being determined is 
contained between them. The corrections for deformation and unsmoothing of aerial film are cal- 
culated in non-linear dependences based on the divergences of sample and measured co-ordinates 
of reseau points or of 8 co-ordinate marks got by aerial camera. 
Model construction is carried out in two steps. The first step is to solve the problem of 
inner orienting and to define parameters of outer model orienting. The outer model orienting can 
be carried out both in matched vertical-plane control points and in non-matched plane and vertical 
control points. The minimum of plane control points must be 2, and that of vertical- 4. The second 
step is to insert corrections into measured co-ordinations and to calculate the Spatial co-ordinates 
of the rest of the model points, using the above obtained parameters of outer orienting ; the quantity 
of the points being defined is not limited. In the process of constructing the model there is made the 
analysis and sorting out of erroneous data. 
The program approbation was carried out by photographs models and by real photographs 
of four experimental sections. The program methodical mistakes were defined by mathematical 
photograph models at scale 1:5 000. Errors of orienting elements and of Spatial coordinates of 
points of ten models came to nought, thus testifying to strictness of the solving of constructing 
model problem. 
When the model was constructed by real airphotographs mean relative error of determi- 
ned elevation of non-marked points was 1 1 of the height of photographing. 
For digital mapping by of air survey data a new analogy device STs is elaborated and 
serially produced. 
The processing program of tachimetrical survey envisages for the time being usual me- 
thods of field works conducting and registration of measurements with the following perforation of 
the latter in laboratories. Form and content of field-notes are modernized so, that to provide the 
possibility of direct transfer of measurements results to the computers bearers of information. 
semantic information is fixed into sketches, which are identified with the field-notes of measure- 
ments by numbers of pickets and initial points. 
The program provides computing of rectangular co-ordinates and picket points elevations 
when making a survey by different methods, such as polar, perpendiculars, and line intersections. 
As for the method of perpendiculars there are envisaged three types of survey : 
- from the line, based on two control points ; 
- from the line oriented on an unapproachable control point ; 
- combination of the perpendicular method with the measurement rectangular fronts of buildings. 
In the process of calculation there is carried out checking of calculation of initial infor- 
mation as well. 
The complex of programs of relief approximation and contour construction is worked out 
taking into account that for different types of relief there exist different optimal approximating 
functions and kinds of digital models of relief (DMR). 
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