Recently, marine accidents are frequent in the important harbours and the special narrow waters (straits) in Japan. As one counterplan for them, aerial photogrammetric analysis of ship navigation or maritime congestion in the important harbours has been planned by the Maritime Safety Board. Chosen as the survey areas are 3 harbours, that is, Keihin Harbour, Osaka Harbour and Kobe Harbour. The said survey and analysis are considered to be different to the traffic analysis by the means of aerial photogrammetry, owing to some conditions of lower-speed of ship and two dimentional field of water, etc. Aerial photography is taken during rush-hours in the most congested season and during the comparatively slack time.
On this report, the preliminary analysis made for dealing with these plans and, as a result, maritime congestion in Osaka Harbour on March 14, 1962 are generally described.

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In investigating the traffic condition of the road, it is advantageous to use photographs taken above from an airplane or a helicopter as materials for analysis than other ways of measurement. In the full application of this method to trafficengineering, however, it is necessary to examine its merits and demerits. The aim of this thesis is to thron light on the fields of traffic-engineering, and thereby to decide its new direction by inquiring into this method.

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These are the third experimental works on the vertical accuracy of aerial photographs as a continued report of Vol.1, No.3 in 1962 and Vol.2, No.3 in 1963. The aerial photographs at a scale of 1: 7920 taken by the RC 8 camera with the Aviogon lens were measured with the Wild A7 Autograph using the correction plate and the Kelsh Plotter independently by each three men. The square mean errors are between ±17cm and ±37cm for the Kelsh Plotter and ±14cm and ±20cm for the Wild A7 Autograph. These result is shown in the graphical form in the following thesis and you can easily understand in comparison with the former experimental result without the correction plate.

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This is a report on the test of a polyester aerial photographic film developed by Fuji Photo-Film Company.
To investigate the physical and photographic characteristics following 3 series of tests were performed.
1) As a practical test, 324 photographs were taken by 4 aerial surveying companies, and no trouble was found as to the manipulation of aerial cameras and the photographic processing. The negatives proved better qualities than the triacetate aerial photographic film produced by the company.
2) For the investigation of the irregular shrinkage of the film, relative orientation of 35 stereo-models were carried out with 3 first order instruments and a precise comparator.
From the residual error of each relative orientation the closing error and the running mean were calculated, and it was found that the geometrical precision of the new film is almost equivalent to that of the tri-acetate film.
3) The photographic sensitometry and the deformation measurement were carried out at the laboratory of Fuji Photo-Film Company. For the deformation measurement the pin-gauge method and the comparison to the mesh-plate were applied it was proved that the new film has a very good physical quality.

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