I have used a multi-criteria analysis which uses factor weighting for flood risk identification in a river basin using ArcGIS 10.1. My factors are rainfall, drainage, density, slope, and land use.
But the result of the analysis shows non-flooded area as flooded and flooded areas as not flooded. (I have a digitized basemap which shows the flooded area of that river.) What should I do to correct it and have results same as the flooded area base maps published by our countries disaster management center?
Please tell me how to have at least 90 percent accuracy of my result when compared with the base maps which show the flooded areas.