Figure 4c. Axios delta — 3x3 high pass filter
Figure 4d. Axios delta — Sobel operator
DISCUSSION — CONCLUSIONS
Geomorphology, geology, soils, land cover, land use and
climate are important factors for the formation of drainage
network, catchments and estuaries of a river. These factors in
combination with marine influences (waves, sea currents) affect
delta formation.
In this paper, we search through the possibilities of visual
interpretation of primary image data and enhanced image data
on the study of coastal areas of Thessaloniki and particularly on
Axios and Gallikos delta area.
Visual image observation — image interpretation (photo-
interpetation) results in important information about the form of
estuaries, Axios bird-foot delta, the formation of lagoon at
Gallikos estuaries, landcover outside the riverbed, deposition
areas of the transported material and for other features as roads
and cultivated land. Digital image processing and particularly
image enhancement make the above features more interpretable.
The results of visual image interpretation of SPOT satellite
image and after image enhancement are very interesting and
useful for the theoretical and practical study of delta areas.
The study of coastal areas are of great importance for the Greek
area (mainland — islands), concerning settlements, tourism,
culture, maritime transport, delta formation etc.
Photogrammetry | — digital image processing and
photointerpetation — image interpretation significantly
contribute to this study as presented in this paper for the case of
river delta areas.
REFERENCES
ASPRS, 2004. Manual of Photogrammetry, 5^ Edition.
American Society for Photogrammetry and Remote Sensing,
pp.416-417.
Erdas Field Guide™, 2010, Erdas Inc. U.S.A. pp.455, 474, 535.
Lillesand T.M., Keifer R.W., 1987. Remote Sensing and Image
Interpretation. 2" Edition, John Wiley and Sons, Inc., pp. 176-
179.
Zuidam R.A., Zuidam-Cancelado F.L, 1979. Terrain analysis
and classification using aerial photographs. ITC, The
Netherlands, pp. 166.
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