800 1200
1600 (m)
Fig-7 Elevation of the study area
seriously-deteriorated areas are concentrated around
the top of the mountain and they extend along the
ridge, and that the moderately-deteriorated areas are
dotted in a wide area around the summit of the
mountain in the top of the ridge and the slope.
And the relationship between the deterioration and
topographical conditions, such as elevations, slope
gradient, and aspects, are also clarified statistically.
First, slope gradient and slope aspects were calculated
referring to the method by Nogami (1995) from
neighboring grids by DEM. The distribution of the
topographical conditions of the study area is shown in
Fig-7 - 9. And, Fig-10 - 12 depicted the relationship
between the deterioration and topographical
conditions.
From Fig-10, it become clear that seriously-
deteriorated areas is concentrated over 1500m a.s.l.
and moderately-deteriorated areas is widely
distributed over 1000m a.s.l..
Moreover, from Fig-11, it can be recognised that
moderately-deteriorated areas and areas without
deterioration are distributed in the slope with the
gradient of 40° ,while seriously-deteriorated areas is
distributed in gentle slope areas of 20° - 30°
From Fig-12, it can be found that about 70% of
seriously-deteriorated areas are facing south directions
and 20% are facing south direction and 20% east
direction. It can be concluded that the deterioration are
Fig-8 Slope gradient of the study area
SICH
Em
os 9^,
Ho Ur mn
Fig-9 Slope aspects of the study area
remarkable in the south - the southeastern slope. But,
there is a room of a more detailed examination because
it has the possibility that a difference in brightness by
the slope direction of the air photograph influences the
interpretation accuracy.
716 International Archives of Photogrammetry and Remote Sensing. Vol. XXXII, Part 7, Budapest, 1998