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Journal of Applied Sciences
Year: 2008  |  Volume: 8  |  Issue: 4  |  Page No.: 594 - 600

Geographic Information System and Remote Sensing: Proposing a Model for Providing Erosion Features Map in Iran at the National Scale

Ali Mohammadi Torkashvand    

Abstract: This study in Jajrood sub-basin, North East Tehran, was conducted to investigate some methods for water-soil erosion types mapping by GIS. Four models were used for providing working units` maps by integration of data layers including A. plant cover, geology and slope B. land use, geology and slope C. land use, rocks erodibility and slope and D. land use, rocks erodibility and land units. The surface, rill and gully erosion intensity in the 314 spot were controlled to provide ground truth map from each of these erosion features. Soil erosion type`s map obtained from the integration of these truth maps and then this map was crossed by the maps A to D. Results indicated that the integration of land use, rocks erodibility and land units layers is a better model for providing erosion types map than other models from an economic and executive regards. The cross of the map D with the ground truth maps of surface, rill and gully erosions showed the greatest and least accuracy are related to providing gully erosion and erosion features maps, respectively. The greatest precision of model was related to providing gully erosion map (with coefficient of variation 17.8%) and the least precision (with 40.5% coefficient of variations) was related to providing erosion features map. In conclusion, model D is suitable for preparation of gully erosion map no erosion features map. It is recommended that the same study is done in another basin with the different climate and geology.

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