Carl J. Legleiter Brandon T. Overstreet 2018 The data are contained with a comma-separated values (*.csv) text file. Reston, VA U.S. Geological Survey https://doi.org/10.5066/F7HT2N96 Field spectra were collected from the Deschutes River near Bend, OR, July 26-28, 2016, to support research on remote sensing of river discharge. Reflectance measurements were made from a raft in the reach of the Deschutes River between Benham Falls and Dillon Falls using an Analytical Spectral Devices FieldSpec3 spectroradiometer operated in reflectance mode. The depth at each spectral measurement location was interpolated from field measurements of depth obtained with an echo sounder. This data release provides both the reflectance spectra and the interpolated depths and can be used to develop relationships between depth and reflectance for mapping river bathymetry from field spectra or passive optical remotely sensed data. These field spectra were used to establish relationships between depth and reflectance that could be used to infer water depth from passive optical image data or field spectra. This kind of depth information could be incorporated into techniques for measuring river discharge from remotely sensed data. 20160726 20160728 ground condition Complete None planned -121.5225219679 -121.36322021009 44.002693501858 43.848393763499 USGS Thesaurus field spectra reflectance depth USGS Metadata Identifier USGS:59fa211ae4b0531197aff3ac Geographic Names Information System (GNIS) Deschutes River Oregon Bend Benham Falls Dillon Falls none none Carl J Legleiter U.S. Geological Survey Geomorphology and Sediment Transport Laboratory mailing and physical

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Golden CO 80403 US 303-271-3651 cjl@usgs.gov No formal attribute accuracy tests were conducted No formal logical accuracy tests were conducted Data set is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details. No formal positional accuracy tests were conducted No formal positional accuracy tests were conducted Water depths at each spectral measurement location were interpolated from depth measurements made by a SonarMite echo sounder coupled to a Trimble R8 real-time kinematic (RTK) GPS receiver that provided a GPS position for each depth measurement location. The field spectra were measured from a raft on which a second Trimble R8 RTK GPS receiver was mounted to define the boat's orientation as well as its position, along with GPS time stamps. The time stamps from the GPS and the file save times from the spectroradiometer then were used to link each field spectrum to a spatial location. The mounting geometry of the spectroradiometer and the two GPS receivers was measured and used to calculate the position of the sensor fore-optic as an offset relative to the positions of the two GPS receivers. The locations of the depth (from the ADCP) and reflectance (from the spectroradiometer) measurements then were transformed to a channel-centered coordinate system and the geostatistical approach described by Legleiter and Kyriakdis (Legleiter, C.J. and Kyriakidis, P.C., 2008. Spatial prediction of river channel topography by kriging. Earth Surface Processes and Landforms, 33(6): 841-867) was used to estimate the depth at each spectral measurement location by ordinary kriging. 20160802 Carl J Legleiter USGS Geomorphology and Sediment Transport Laboratory mailing and physical

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Golden CO 80403 US 303-271-3651 cjl@usgs.gov The field spectra were obtained with an Analytical Spectral Devices (ASD) FieldSpec3 spectroradiometer operated in reflectance mode, which involved periodically (approximately every 10 minutes) pointing the sensor at a white reference panel that served as a 100% reflectance standard. Subsequent measurements of the upwelling spectral radiance from the river channel were then normalized by the radiance from the white reference panel to obtain reflectance values. The data initially were saved in the native .asd file format and then imported to MATLAB via a custom function developed to read .asd data files. All of the spectra were plotted and obvious outliers (for example, when the white reference panel was still in the field of view) were removed. The spectra were subset from the original wavelength range from 375 to 1050 nm to 400 to 900 nm due to excessive noise at shorter and longer wavelengths. The spectra then were smoothed by twice applying a third-order Savitzky-Golay filter with a frame width of 15 nm. 20160802 Carl J Legleiter USGS Geomorphology and Sediment Transport Laboratory mailing and physical

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Golden CO 80403 US 303-271-3651 cjl@usgs.gov Deschutes River, Oregon, Bend, Benham Falls, Dillon Falls Point Transverse Mercator 0.9996 -123.0 0.0 500000.0 0.0 coordinate pair 0.01 0.01 METERS WGS84 WGS84 6378137.0 298.257223563 DeschutesFieldSpectra Field measurements of water depth (m) and spectral reflectance at wavelengths from 400-900 nm Producer defined Easting Easting (X) coordinate of the spectral measurement location in meters based on RTK GPS positions for the two GPS receivers mounted on the raft from which the spectra were measured. Easting coordinates are listed in the first column of the DeschutesFieldSpectra.csv file. Beginning with the third line (row) of this file, each line (row) represents a different spectral measurement location. Producer defined 625900 626500 meters Northing Northing (Y) coordinate of the spectral measurement location in meters based on RTK GPS positions for the two GPS receivers mounted on the raft from which the spectra were measured. Northing coordinates are listed in the second column of the DeschutesFieldSpectra.csv file. Beginning with the third line (row) of this file, each line (row) represents a different spectral measurement location. Producer defined 4866400 4867200 meters Depth Water depth in meters, interpolated at the spectral measurement location based on water depth measurements obtained with an echo sounder. Depths are listed in the third column of the DeschutesFieldSpectra.csv file. Beginning with the third line (row) of this file, each line (row) represents a different spectral measurement location. Producer defined 0 20 meters Reflectance (%) at wavelength (nm) Spectral reflectance measured with an Analytical Spectral Devices (ASD) spectroradiometer at wavelengths from 400-900 nm with a 1 nm spectral sampling interval. The wavelengths are listed in the second line (row) of the DeschutesFieldSpectra.csv file and each column contains the reflectance values for that wavelength at each spectral measurement location. Beginning with the third line (row) of this file, each line (row) represents a different spectral measurement location. Producer defined 0 100 percent U.S. Geological Survey - ScienceBase mailing and physical

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Denver CO 80225 USA 1-888-275-8747 sciencebase@usgs.gov Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. The data you have secured from the U.S. Geological Survey (USGS) database identified as "Field spectra from the Deschutes River near Bend, OR, July 26-28, 2016" have not received USGS approval and as such are provisional and subject to revision. The data are released on the condition that neither the USGS nor the U.S. Government shall be held liable for any damages resulting from its authorized or unauthorized use. Although these data have been processed successfully on a computer system at the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. The USGS or the U.S. Government shall not be held liable for improper or incorrect use of the data described and/or contained herein. The data are provided in a .csv file that can be read in a text editor (e.g., Notepad), spreadsheet (e.g., Excel), or numerical computing (e.g., MATLAB) software package. 20200831 Carl J Legleiter U.S. Geological Survey Geomorphology and Sediment Transport Laboratory Research Hydrologist mailing and physical

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Golden CO 80403 US 303-271-3651 cjl@usgs.gov Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998