measured and submitted to any conventional plotting operation, The main difference between this approach and the 
usual photogrammetric procedure is that the equipment necessary for the plotting and measuring of stereo-ortho- 
photos is extremely simple and relatively inexpensive, Similarly, the plotting operations are very simple and do 
not require any photogrammetric knowledge or special skill on the part of the operator. 
A complete instrument system consisting of the Orthocartograph for the production of stereo-orthophotos 
and the Stereocompiler for their processing, was developed at the National Research Council under the direction 
of Dr, T. Blachut, The experimental results are very promising. Introduction of the Stereo-orthophoto concept 
has added to the existing arsenal of photogrammetric procedures, a new and interesting technique. 
At the Photogrammetry Office of the Ontario Ministry of Transportation and Communications, an automatic 
mapping system has been developed under the direction of Mr. Malcolm H. MacLeod, This system incorporates 
automatic drafting and permits editing of photogrammetric data by means of a computer programme, It employs 
a precision stereoplotting instrument coupled to an electronic coordinate printer and magnetic tape unit, an 
electronic computer and an automatic drafting table, 
As the operator traces the detail of a stereomodel the X and Y coordinates are automatically registered 
on a magnetic tape, Special codes are used to identify different features. The X and Y coordinates for each 
contour are continuously registered on magnetic tape at equal time intervals, Planimetric details, such as 
houses, are defined by X and Y coordinates of their corners, straight portions of roads by the beginning and 
end of tangents, The computer programme edits the data in a similar manner as a human editor would do; 
the houses are squared, both sides of the road are made parallel, proper curves applied, etc. In addition, the 
computer programme permits deletion of certain information from the final map as may be dictated by special 
requirements, and to symbolize certain details as required by different scales of the final map. After the editing, 
the maps are drawn using an automatic drafting.table equipped with a light beam head, 
A complete map at the desired scale can be automatically drawn showing either all information registered 
on the magnetic tape, or only specific features such as houses or roads or drainage, or any combination of the 
data, For instance, magnetic tape compiled originally for plans at a scale of 1:2500 can be automatically edited 
by a computer programme to produce maps at a scale of 1:50, 000 or 1:25, 000 with the proper symbolization. 
This automatic system has been in operation for two years and is employed on a production basis, 
The Surveys and Mapping Branch of the Federal Ministry of Energy, Mines and Resources is in the process 
of developing, under the direction of Brig. L.J, Harris, an automatic cartographic system especially directed 
towards the implementation of the Federal mapping programme in Canada, This system uses existing compilation 
as well as new compilation, Its objective is to minimize, and finally, completely eliminate the enormous task of 
manual scribing, and to allow flexibility in changing the scale of the map, content and map revisions, 
The Government of Canada, through the Canadian International Development Agency, participates in mapping 
developing countries in Africa, the Caribbean, South America and Asia. This work is carried out by Canadian 
photogrammetric companies, During the reporting period topographical maps at 1:50, 000 were compiled in Guyana, 
Tanzania, Kenya and Ghana; large scale mapping was undertaken in Morroco, Trinidad and Tobago and Barbados. 
In connection with these projects, Dr. J. M. Zarzycki has developed photogrammetric systems for mapping of 
tropical and inaccessible territories with the view of minimizing the requirements for ground control, 
During the reporting period the following photogrammetric equipment has been added in Canada: 
Le Plotting Instruments - Comparators - Point Transfer Devices 
Wild Heerbrugg 5/A-10,7/A-8, 29 B-8, 2 B-9, T'STK, 
19 PUG. 
Kern 9 PG-2 
Zeiss (Oberkochen) 4 Planimats, 2 PSU 
Zeiss (Jena) 8 Stereometrographs, 3 stecometers, 
6 Topocarts 
Space Optics 1 NRC Monocomparator 
Nistri-Bendix 1 Analytical Plotter 
2, Instruments for Orthophotography and Photo Mapping 
S. F. U. M. 5 instruments 
Hobrough Gestalt 
Mapper 2 instruments 
Zeiss (Oberkochen) l1 Zeiss Gigas 
Zeiss (Jena) 2 Orthophoto attachments for Topocart 
Wild Heerbrugg 2 E-4 rectifiers