The investigation of accuracy and precision of rocks erodibility map in providing erosion types map by GIS

Subject Areas : Urban and Regional Planning Studies

ali mohamadi Torkashvand ¹ (استادیار دانشگاه آزاد اسلامی واحد رشت)
alireza eslami ² (استادیار دانشگاه آزاد اسلامی واحد رشت)
vahid shadparvar ³ (دانش آموخته دانشگاه آزاد اسلامی واحد رشت)

Received: 2008-06-25 Accepted : 2009-03-15 Published : 2009-02-19

Keywords: GIS, Erosion, Rocks erodibility,

Abstract :

The possibility using rocks erodibility as a model in providing erosion types map was investigated in downstream of Latian dam. Rocks erodibility layer was crossed by digitized ground truth maps of surface, rill, gully erosions and erosion features and the accuracy, error and precision of this layer as a model in estimating each of erosion types was computed. Results showed that the rocks erodibility accuracy in providing surface, rill, gully erosions maps, and erosion features map was 59.1, 59.9, 71.9 and 42.9%, respectively. Rocks erodibility map can be used in providing gully erosion map with an error 28.1% and has a low accuracy in providing surface and rill erosion maps especially erosion features map, therefore, it couldn’t used in preparing erosion types maps as a working units map.