In recent years, the utility of aerial photographs have been recognized more universally, and aerial photograpos have come to be used widely for various photo-interpretations as well as for photogrammetry. We also were studying several photo-interpretations for sevral years and reporting the utility of its. This study have cohenrance with the photogeological studies which had reported by papers such as “Geological Study Using Photogeologic Interpretation. (part I, II) ”
In this study, we examined basec elements (Tone, Texture, Moutain Shape, Valley Shape, Drainage, Vegetations, Soil, Erosin and Weathering, Landslide, Transported deposit.) for photogeological interpretation in vicinity of Osakayama, Shiga prefecture, where is underlain by Palaeozoic sediments.
A Summery of results of his study is as follows:
1) In consequence of photogeplogical interpretation, this area was divided into five lithologic units as follows:
I. Diluvium (Clay, Sand, Gravel, Lignite.)
II. Palaeozoic Group (Chert)
III. Palaeozoic (Alternation of chart, Shale and Sandstone)
IV. Igneous rock (Granite porphyry, Quartz porphyry)
V. Alluvium (Clay, Sand and Gravel)
However the formations which are narrow and have complex lithological components can not be definitely discrimitated by aerial photographs.
2) Large structual sets, such as faults and fractured zones, were mainly interpoetated on topographic feature. Small structural sets, such as joints and beding, were interpretated on vegetations and soil. These structures which were interpretated bo aerial photographs coincided with the structures mapped on the ground.
3) Photogeological survey which is based upon the scientific interpretation of features or aerial phoeographs in a very useful technical method inngeogical surveys.

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In photogrammetry, we must adjust the errcars by statistical method, so we propose this methods in this report.

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New dizitizing apparatus for automatic reading of coordinate values at monocomparator and at optical profiler are described.

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An experimental study on air-photo signal has been carried out for various sizes, shapes and colours in several kinds of back grounds. As the 1st stage, contrast of various colours against various vegetations, buildings, etc. has been compared on the photographs. For the 2nd stage, 57 signals of various kinds of shapes, sizes, and colours were photographed in scale 1/6, 000 and 1/10, 000, and their definitions were examined by inspection and through eyepiece of A7. Sizes of signals which were definitely recognized on the photographs of scale 1/6, 000 were as follows; signals with 3 or 4 branches of 0.4m length, squares of 0.3m side length, and black squares on white beton buildings of 0.8-1.0m side length.

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