Relationship between the color of color aerial photograph determined by micro multi photometer MMP IID and the results of soil survey was investigated using the color aerial photograph taken in the northern part of Yokohama City on November 1972.
In paddy areas mainly consisted of muck soils, high correlation was recognized between the color components such as dominant wavelength, brightness, and the occuring depth of gleyed muck horizon affecting the humidity of surface soil. But no correlation was found between color and occurring depth of muck horizon.
Grades of humus content of bared upland soils are directly interpreted from the degree of darkness of color aerial photograph, which is difficult to interprete from panchromatic aerial photograph.
Fallow paddy fields are easily differentiated from paddy field by its high chromatic yellowish color owing to the withered weeds. Moreover, the chroma of fallow paddy field appears to change to higher and become to more rough textured with the increase of fallowing years.
Main vegetables in upland field in this season, such as radish, carrot, spinach, pe-tsai, mustard, welsh onion, lettuce, give a characteristic color on the photograph respectively.
To identify the wetness of paddy soils in lowland areas, it seemed most suitable to take aerial photograph at the time with little or no rain for at least several days before photographing as early as possible after the harvest.

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Contour map is widely used not only in engineering fields, but also in agricultural or scientific fields. So, many studies have been done to make a contour map with high accuracy automatically from digital terrain data measured in the mesh system, accompanied by the use of a large computer. In most of these studies, contour lines are regarded as “lines”.
But in this study, from a different point of view, contour lines are regarded as “small continuous dots”. According to the method used in this study, the computer work is quite simple, because the computer has only to make the on-off judgement of each dot which corresponds to each datum obtained from the close interpolation between a set of four neighbouring digital terrain data. The work to recognize “continuous dots” as a line, therefore, is done not by a computer, but by the human eyes.
Moreover, this method has a great advantage that it can be applied to any kind of digital data which are converted into mesh system.

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Remote sensing research commision of the Japan Computor Usage Development Institute (CUDI) has been working on the ERTS data application research project since October 5th 1973. On February 5th 1974, the results of research and development of techniques, obtained by that data, were made public through lectures and exhibition of the productions under co-sponsorship of the Ministry of International Trade and Industry (MITT) .

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