Data Details Page

The Detrended Digital Elevation Model (DtDEM) was calculated from the 2011/2012 ground surface (5 ft grid; Woolpert 2013) by subtracting the water surface elevation of the river and major tributaries as determined from lidar (Woolpert 2013). Daily mean flows during lidar acquisition (December 14, 16, and 17, 2011) were calculated by USGS as 293-296 at the Lewiston streamgage (11525500), 307-308 at Limekiln, 351-353 at Douglas City, 384-390 at Junction City, and 413-417 cfs at the above North Fork gage (11526400). The water surface was laterally extended to enable detrending of ground outside the river channel. Elevation values are in feet and are negative for the river bed bathymetry (water depth). The approximated water surface model may include steep transitions around sharp river bends or in the neighborhood of tributaries. For details, see process descriptions within the metadata files and the Metadata Excerpts file in PDF format, which includes supplemental figures. Woolpert 2013 is online at http://odp.trrp.net/Data/Documents/Details.aspx?document=2106.