This study is the numerical analysis of degration's masses and it's factors. We have obtained the factors of degradation on aerial photographs, and estimated the point rainfall with digital terrain model.
We performed a test on this method to the River Tenryu and obtained the satisfactory results.

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A pair of stereomicrographs of a specimen has been taken through a scanning electron microscope. The measured profiles of the specimen obtained by analysing the pair is in a good agreement with its actual profiles. Contour maps of specimens have been obtained by the use of Autograph A 7. A theoretical discussion is made on the error in the height measurement.

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The informations of the distrbution and qualities of vesitations in urban area became very important for the planning of the social lives or nature protection in recent times.
But to finding out each vesitation images from air-photos clearly and measure them by nacked eyes are rather difficult interpretation works in large area.
So it has a necessity of making out the clear copies such as only shown the vesitation images in those coverages, eliminatiog the other objects from them as for the materials of automatic measurement by the micro-photo-densit-meter operations.
The infra-colour photographs cleary shows the distribution of the vesitation images for nacked eye observation by their sensitivities of infra-red reflection of vital leaves with their redish and yellowish factors of coloured developing results. But when we separate them by the use of 3 original colour filters, each of their results contain the dark parts influences, besides their own colour factors distributions. For instance, the magenta transparent films which transfer the lay of passed through the green filter from colour pictures are not only shows magenta images qualities but also they transfer the same factors of which possessed in dark images such as shadows or water surfaces in that area. Then we must deduct the togethering part of these original 3 colour factors from each transparent films for to get the single colour effect parts only.
The vesitation images in infra-colour photographs, contain much more magenta and yellow qualities than the other objects evidently.
The auther produced the vesitation pictures just as illuminated on dark night sight pictures of the street by combinating the cian colour factor posi films and monochrome nega films that are obtained from the infra-colour photographs. And showed the possibilities of automatic measurement of each colour factor distributions on separately.

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