Columbia River, WA/OR (P260) Bathymetric Digital Elevation Model (30 meter resolution) Derived From Source Hydrographic Survey Soundings Collected by NOAA
Bathymetry for the Columbia River was derived from forty-five surveys containing 306,711 soundings. Nine older, overlapping, less accurate surveys were omitted before tinning and the overlap from three older, less accurate surveys was omitted. The average separation between soundings was 45 meters. The surveys used …