This paper presents the result of a geological study using photogeologic interpretation in the Agematsu area including the Kiso River basin.
In Japan, the photogeologic interpretation have been studied only qualitatively, but the quantitative interpretation were not yet utilized fully in the photogeologic study. Both the methods of interpretation are very important equally in order to find the possibility and limit of photogeologic interpretation. So, we interpret airphotographs qualitatively and quantitatively in this study. We found and traced lineaments on airphotographs in detail, and checked these interpretations in the field. Joints, faults and fractures were measured and mapped on the ground, and drainages were traced on the topographic map (1: 5, 000) . The above mentioned elements were graphed separately each other and compared numerically. Consequently, these data indicated that (1) an avarage of about 55% of the joint sets on the ground coincided with airphoto lineament sets, (2) about 70% of the faults and fractures coincided with the distribution and orientation of airphoto lineaments, and (3) drainage frequency and density changed clearly according to rock types.
Although we can not jump to such the conclusion that these results will fit to everywhere because of the complex geological structure in Japan, we found, on these data, that the photogeologic interpretation was very useful. We hope our studies will give some suggestions to photogeologists.

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Use of aerial photographs for the engineering purposes has been increasing remarkably. But we have never had the thesis concerned to the analysis of the vertical accuracy of aerial photographs in our country. I had the experimental works about comparison of datas obtained from direct levelling with the photogrammetrical method. The aerial photographs at a scale of 1: 7920 taken by the RC 8 camera with the Aviogon were used and measured with A 7 Autograph independently by four men. As far as these experiments are concerned, we recognized to be fully effective for the ordinary engineering purpose.

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This report covers a survey planned by The National Capital Region Redevelopment Commission and performed by Pacific Aero Survey Co., Ltd. receiving cooperation from Agency of National Geography of Construction Ministry, Metropolitan Police Headquarters and Kanto-District Construction Bureau.
This survey or analysis of traffic volume utilizing aerial photography is the first trial ever made in the world. Chosen as the survey areas were 5 routes, that is, Ginza Avenue, Showa Avenue, Market Avenue, Hibiya-Kachidokibashi Route and Otesuzaki Route. Aerial photography was taken on September 29, 1961, during rush-hours in the morning and the evening as well as the day-time when there was comparatively light traffic. The aircraft used was Beech-craft C-18S, JA-5031. The aerial camera used was a Wild RC-8, 18×18, f=209.06mm, 450mμ filter and the aerial film was GEVART AVIPHOT Pan-33. The picture scale is 1/6, 000 and enlarged four times to scale of 1/1, 500, for the study of different types of traffic.

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Errors in orientation elements and displacements of model co-ordinates are discussed and analysed as the linear functions of the error of photographic co-ordinates from the view point of analytical photogrammetry. It is also given the case of a grid plate oriented by 6 point method as a simple example. For this case, numerical results are compared for two categories of observational methods. In the first category, one measure the co-ordinates of the points on both photographs with point transfer device and ordinary co-ordinate comparator and in the second, one measure the co-ordinates of the points on the first photograph and horizontal and vertical parallaxes with stereo-comparator.

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