Home / 9_Technical_Reference\ / Methods Methods The following links provide information on individual methods used to process survey data or calculate CHaMP metrics: Thalweg Detrending Bankfull Polygon Bankfull Centerline Wetted Polygon Wetted Centerline Water Surface DEM Wetted Area Depth Raster Wetted Cross Sections Bankfull Cross Sections Thalweg Profile Thalweg Depth Profile Bank Angle Metric Filtering