tic 
VW 
y)hic 
National Congress of Photogrammetry, Photointerpretation & Geodesy, 7-12 July 1974, 
Mexico City. 
4. Nielsen, U., "Tests of an Airborne Tilt-Indicator", Photogrammetric Engineering XL, 8, p. 953, 
Aug. 1974, 
5. Nielsen, U., "More on Distortions by Focal-Plane Shutters", Photogrammetric Engineering & Remote 
Sensing, XLI, 2, p. 199, Feb. 1975. 
6. Masry, S.E., and Vanicek, P., "Derivation of Camera Rotations from LTN-51 Inertial Navigation 
System", U.N.B. Report No. 37, March, 1975, p. 20. 
7. Zsilinszky, V.C., and Palabekiroglu, S., "Volume Estimates of Deciduous Forests by Large-Scale 
Photo Sampling", Canadian Institute of Forestry, Workshop on Canadian Forest 
Inventory Methods, Dorset, Ontario, 24-27 June 1975. 
8. Charman, W.N., "Visual Factors in Photographic Detection, Recognition and Resolution Tasks. Part I 
Resolution", Photographic Science and Engineering 19, 4, p. 228, July/August 1975, 
9. Boissonneau, A.N., and Jeglum, J,K., "A Regional Level of Wetlands Mapping for the Northern Clay 
Section of Ontario", Third Canadian Symposium on Remote Sensing, Edmonton, 22-24 
Sept. 1975. 
10. Graham, G.W., "Remote Sensing- An Aid to Pipeline & Hydro Tower Construction in Agricultural 
Areas", Third Canadian Symposium on Remote Sensing, Edmonton, 22-24 Sept. 1975. 
11. Kalensky, Z., and Wilson, D.A., "Spectral Signatures of Forest Trees", Third Canadian Symposium 
on Remote Sensing, Edmonton, 22-24 Sept. 1975. 
12. Lawrence, G.R., and Graham, C.W., "Remote Sensing Applied to Algal Problems in Lakes", Third 
Canadian Symposium on Remote Sensing, Edmonton, 22-24 Sept. 1975. 
13. Bujakiewicz, A., "On the Correction of Lens Distortion with Polynomials", to be published, Canadian 
Surveyor 30, 2(?), June (?) 1976. 
COMMISSION II 
Theory, Methods and Instruments of Restitution 
Reporter: Dr. R.A. Stewart, Surveys and Mapping Branch, Department of Energy, Mines and Resources 
During the last four years, the trend in Canadian photogrammetric institutions and mapping industry 
has been towards the automation of restitution and data collection. The tendency to speed up map 
production with less human effort has been the key element in the acquisition of instruments. Today 
the Canadian mapping community is equipped with a variety of restitution systems. The most important 
aspect of them all is the addition of electronic components such as electronic data digitizers, inter- 
active units, mini-computers, desk-top calculators and data storage and display units. The existing 
first and second order plotters are being supplemented with one or more of these additional features. 
The responsibility for the national mapping program rests with the Surveys and Mapping Branch of the 
Federal Department of Energy, Mines and Resources. The Branch is currently engaged in the production 
of 1:50 000 scale maps and in the revision of existing ones. There are about 65 stereo instruments 
of first and second order. In the field of orthophoto, the Branch has orthophotoscopes and rectifiers. 
During the last four years, the Branch has been engaged in a number of theoretical and practical 
studies related to the restitution of both conventional and non-conventional imageries. Many of the 
provincial and regional governments are involved in medium to large scale mapping for environmental 
studies, resource studies and engineering purposes. Seven of the ten provincial governments and at 
least two metropolitan areas have mapping facilities. Besides these, there are government agencies 
such as the Ontario Department of Transport and Communications which have their own instrumentation 
for restitution and automated Cartography.