To support an investigation of the feasibility of measuring river bathymetry using remotely sensed data acquired from a small unmanned aircraft system (sUAS), remotely sensed bathymetry and field measurements were collected from two cross-sections on the Blue River and two cross-sections on the Colorado River near Kremmling, CO on October 17-18, 2018. The data in this release include optical measurements using the following sensors: WET Labs ECO, WET Labs ac-s, and LISST 100x. The WET Labs ECO provides measurements of turbidity and chlorophyll and colored dissolved organic matter concentration. The WET Labs ac-s provides information of the absorption and attenuation coefficients of the water sampled across a range of wavelengths. The LISST 100x provides information on the mean grain size of sediment in suspension and the concentration of suspended sediment.

To support an investigation of the feasibility of measuring river bathymetry using remotely sensed data acquired from a small unmanned aircraft system (sUAS), remotely sensed bathymetry and field measurements were collected from two cross-sections on Colorado River near Parshall, CO on June 13, 2019. The data in this release include optical measurements using the following sensors: WET Labs ECO, WET Labs ac-s, and LISST 100x. The WET Labs ECO provides measurements of turbidity and chlorophyll and colored dissolved organic matter concentration. The WET Labs ac-s provides information of the absorption and attenuation coefficients of the water sampled across a range of wavelengths. The LISST 100x provides information on the mean grain size of sediment in suspension and the concentration of suspended sediment.

To support an investigation of the feasibility of measuring river bathymetry using remotely sensed data acquired from a small unmanned aircraft system (sUAS), remotely sensed bathymetry and field measurements were collected from two cross-sections on Colorado River near Parshall, CO on June 13, 2019. The data in this release include optical measurements using the following sensors: WET Labs ECO, WET Labs ac-s, and LISST 100x. The WET Labs ECO provides measurements of turbidity and chlorophyll and colored dissolved organic matter concentration. The WET Labs ac-s provides information of the absorption and attenuation coefficients of the water sampled across a range of wavelengths. The LISST 100x provides information on the mean grain size of sediment in suspension and the concentration of suspended sediment.

To support an investigation of the feasibility of measuring river bathymetry using remotely sensed data, remotely sensed bathymetry and field measurements were collected on the Colorado River near Lees Ferry, AZ on September 23, 2019. The data in this release include optical measurements using the following sensors: WET Labs ECO, and WET Labs ac-s. The WET Labs ECO provides measurements of turbidity and chlorophyll and colored dissolved organic matter concentration. The WET Labs ac-s provides information of the absorption and attenuation coefficients of the water sampled across a range of wavelengths.

To support an investigation of the feasibility of measuring river bathymetry using remotely sensed data, remotely sensed bathymetry and field measurements were collected on the Colorado River near Lees Ferry, AZ on September 23, 2019. The data in this release include optical measurements using the following sensors: WET Labs ECO, and WET Labs ac-s. The WET Labs ECO provides measurements of turbidity and chlorophyll and colored dissolved organic matter concentration. The WET Labs ac-s provides information of the absorption and attenuation coefficients of the water sampled across a range of wavelengths.

Field measurements of various optical properties of the water column were acquired from a single location on the Kootenai River in northern Idaho, September 26-27, 2017, to support research on remote sensing of rivers, particularly estimation of water depth from passive optical image data. The field measurements included in this data release include several parameters measured with three different instruments. A WetLabs EcoTriplet multi-probe was used to measure the volume scattering coefficient (Beta) at 700 nm, the back-scattering coefficient (b_b) at 700 nm, chlorophyll concentration, colored dissolved organic matter (CDOM) concentration, and turbidity. A Sequoia Scientific LISST-100X was used to measure the total mass concentration of suspended sediment and the particle size distribution of that sediment. A WetLabs ac-s was used to measure spectra of the beam absorption (a) and beam attenuation (c) coefficients at 81 wavelengths from 399.6-746.5 nm. All measurements were made from a dock at the Kootenai Tribal Fish Hatchery near Bonners Ferry, ID, by lowering each sensor into the water in turn. Each instrument was allowed to measure a time series of data for 2-3 minutes and the values reported in this data release are time averages over the entire sample duration. The coordinates of the measurements are included in the files comprising this data release and are in the UTM Zone 11N projection and NAD83 datum, with units of meters. Software provided by the manufacturer of each instrument was used to control the sensor in the field, record data to a computer, and export the raw data. Additional data processing (i.e., organization, plotting, and time averaging) was completed using custom functions developed in MATLAB. This data release consists of .csv files with the time-averaged values of each optical parameter; please see the metadata for further information on these files. This field-based data set played a valuable role in developing improved methods for mapping river bathymetry from remotely sensed data and understanding the limitations of spectrally based depth retrieval. In addition to these measurements from the Kootenai River, this data release includes a compilation of similar optical field data from several other rivers where studies have been conducted to develop methods for remote sensing of river bathymetry. These data were all collected using the methods and instruments described above for the Kootenai River and provide a database for evaluating the effects of water column optical properties on spectrally based depth retrieval. This compilation is provided in .csv data files and a Google Earth .kmz file with locations.

Field measurements of various optical properties of the water column were acquired from a single location on the Kootenai River in northern Idaho, September 26-27, 2017, to support research on remote sensing of rivers, particularly estimation of water depth from passive optical image data. The field measurements included in this data release include several parameters measured with three different instruments. A WetLabs EcoTriplet multi-probe was used to measure the volume scattering coefficient (Beta) at 700 nm, the back-scattering coefficient (b_b) at 700 nm, chlorophyll concentration, colored dissolved organic matter (CDOM) concentration, and turbidity. A Sequoia Scientific LISST-100X was used to measure the total mass concentration of suspended sediment and the particle size distribution of that sediment. A WetLabs ac-s was used to measure spectra of the beam absorption (a) and beam attenuation (c) coefficients at 81 wavelengths from 399.6-746.5 nm. All measurements were made from a dock at the Kootenai Tribal Fish Hatchery near Bonners Ferry, ID, by lowering each sensor into the water in turn. Each instrument was allowed to measure a time series of data for 2-3 minutes and the values reported in this data release are time averages over the entire sample duration. The coordinates of the measurements are included in the files comprising this data release and are in the UTM Zone 11N projection and NAD83 datum, with units of meters. Software provided by the manufacturer of each instrument was used to control the sensor in the field, record data to a computer, and export the raw data. Additional data processing (i.e., organization, plotting, and time averaging) was completed using custom functions developed in MATLAB. This data release consists of .csv files with the time-averaged values of each optical parameter; please see the metadata for further information on these files. This field-based data set played a valuable role in developing improved methods for mapping river bathymetry from remotely sensed data and understanding the limitations of spectrally based depth retrieval. In addition to these measurements from the Kootenai River, this data release includes a compilation of similar optical field data from several other rivers where studies have been conducted to develop methods for remote sensing of river bathymetry. These data were all collected using the methods and instruments described above for the Kootenai River and provide a database for evaluating the effects of water column optical properties on spectrally based depth retrieval. This compilation is provided in .csv data files and a Google Earth .kmz file with locations.

Field measurements of various optical properties of the water column were acquired from a reach of the upper Sacramento River in northern California, September 13, 2017, to support research on remote sensing of rivers, particularly estimation of water depth from passive optical image data. The field measurements included in this data release include several parameters measured with three different instruments. A WetLabs EcoTriplet multi-probe was used to measure the volume scattering coefficient (Beta) at 700 nm, the scattering coefficient (b) at 700 nm, chlorophyll concentration, colored dissolved organic matter (CDOM) concentration, and turbidity. A Sequoia Scientific LISST-100X was used to measure the total mass concentration of suspended sediment and the particle size distribution of that sediment. A WetLabs ac-s was used to measure spectra of the beam absorption (a) and beam attenuation (c) coefficients at 81 wavelengths from 399.6-746.5 nm. All measurements were made from a boat by lowering each sensor into the water in turn. Each instrument was allowed to measure a time series of data for 2-3 minutes and the values reported in this data release are time averages over the entire sample duration. Data were collected at three locations near the confluence of Cottonwood Creek with the Sacramento River and positions were recorded with a Trimble Geo7X GPS receiver; the original GPS data was differentially corrected using permanent GPS base stations with the Trimble Pathfinder Office software program. The coordinates of each measurement are included in the files comprising this data release and are in the UTM Zone 10N projection and NAD83 datum, with units of meters. Software provided by the manufacturer of each instrument was used to control the sensor in the field, record data to a computer, and export the raw data. Additional data processing (i.e., organization, plotting, and time averaging) was completed using custom functions developed in MATLAB. This data release consists of .csv files with the time-averaged values of each optical parameter at each of the three measurement locations; please see the metadata for further information on these files. This field-based data set played a valuable role in developing improved methods for mapping river bathymetry from remotely sensed data and understanding the limitations of spectrally based depth retrieval. In addition to these measurements from the Sacramento River, this data release includes a compilation of similar optical field data from several other rivers where studies have been conducted to develop methods for remote sensing of river bathymetry. These data were all collected using the methods and instruments described above for the Sacaramento River and provide a database for evaluating the effects of water column optical properties on spectrally based depth retrieval. This compilation is provided in .csv data files and a Google Earth .kmz file with locations.

Field measurements of various optical properties of the water column were acquired from a reach of the upper Sacramento River in northern California, September 13, 2017, to support research on remote sensing of rivers, particularly estimation of water depth from passive optical image data. The field measurements included in this data release include several parameters measured with three different instruments. A WetLabs EcoTriplet multi-probe was used to measure the volume scattering coefficient (Beta) at 700 nm, the scattering coefficient (b) at 700 nm, chlorophyll concentration, colored dissolved organic matter (CDOM) concentration, and turbidity. A Sequoia Scientific LISST-100X was used to measure the total mass concentration of suspended sediment and the particle size distribution of that sediment. A WetLabs ac-s was used to measure spectra of the beam absorption (a) and beam attenuation (c) coefficients at 81 wavelengths from 399.6-746.5 nm. All measurements were made from a boat by lowering each sensor into the water in turn. Each instrument was allowed to measure a time series of data for 2-3 minutes and the values reported in this data release are time averages over the entire sample duration. Data were collected at three locations near the confluence of Cottonwood Creek with the Sacramento River and positions were recorded with a Trimble Geo7X GPS receiver; the original GPS data was differentially corrected using permanent GPS base stations with the Trimble Pathfinder Office software program. The coordinates of each measurement are included in the files comprising this data release and are in the UTM Zone 10N projection and NAD83 datum, with units of meters. Software provided by the manufacturer of each instrument was used to control the sensor in the field, record data to a computer, and export the raw data. Additional data processing (i.e., organization, plotting, and time averaging) was completed using custom functions developed in MATLAB. This data release consists of .csv files with the time-averaged values of each optical parameter at each of the three measurement locations; please see the metadata for further information on these files. This field-based data set played a valuable role in developing improved methods for mapping river bathymetry from remotely sensed data and understanding the limitations of spectrally based depth retrieval. In addition to these measurements from the Sacramento River, this data release includes a compilation of similar optical field data from several other rivers where studies have been conducted to develop methods for remote sensing of river bathymetry. These data were all collected using the methods and instruments described above for the Sacaramento River and provide a database for evaluating the effects of water column optical properties on spectrally based depth retrieval. This compilation is provided in .csv data files and a Google Earth .kmz file with locations.

The U.S. Geological Survey contracted with Juniper Unmanned to conduct field tests of the ASTRALiTe bathymetric lidar system upstream and downstream of its confluence with the Blue River near Kremmling, Colorado, on October 18, 2018. The objective of this project was to assess the potential to map river bathymetry (i.e., channel bed topography) using lidar data collected from an unmanned aircraft system (UAS). The ASTRALiTe lidar instrument was mounted on a DJI Matrice 600 Pro UAS owned and operated by Juniper Unmanned. As part of the study, Juniper's pilot flew the ASTRALiTe instrument across 2 river transects (cross-stream) on the Blue River and 2 river transects on the Colorado River. This data release includes data delivered to the USGS by ASTRALite on November 15, 2018. The data have been parsed into separate text files for bare earth (i.e., river bed) and water surface returns for each cross-section but have not been filtered or modified in any other way.