This child item contains the raw acoustic Doppler velocity profiler (ADCP) measurements collected by U.S. Geological Survey (USGS) hydrographers at each site to validate Image and Radar velocimetry results. The discharge measurements were collected as part of routine and standard streamflow gaging direct measurement workflows at established USGS gaging locations. The zip file included in this release contains folders for each site. Within each folder are the associated raw ADCP files. For all field sites except BRJ, official discharge records are approved and available in the National Water Information System (NWIS) database. For those measurements with NWIS official measurements, the Site Visit Notes report is included (portable document files [PDF] starting with "SV_"). Also included for each official measurement is an empty text file with the USGS gage station ID, discharge measurement number, and database abbreviation so that users can reference the approved discharge measurement in the USGS database. For example, the Colorado River below Glenwood Springs, CO (CRG) discharge measurement was located at USGS gage number 09085100. It was measurement number 577 in the NWIS database. The text file for this measurement is named "09085100_QM577_NWIS.txt". The other sites contain similarly formatted text files. To aid in validation of streamflow and velocity, summary files that include ADCP velocities summarized on a station/vertical basis extracted from the discharge measurements are also included as *_summary.csv files.
Each Field Site is abbreviated in various files in this data release. File and folder names quickly identify which site a particular file or dataset represents. The following abbreviations are used:

• ACS: Anthracite Creek at Somerset, Colorado, USA
• BRA: Blue River below Dillon, Colorado, USA (collected in August 2023)
• BRJ: Blue River below Dillon, Colorado, USA (collected in June 2023)
• CRG: Colorado River below Glenwood Springs, Colorado, USA
• CRR: Colorado River above Roaring Fork River at Glenwood Springs, Colorado, USA
• ERW: Eagle River below Milk Creek near Wolcott, Colorado, USA
• MCA: Maroon Creek near Aspen, Colorado, USA
• RFG: Roaring Fork at Glenwood Springs, Colorado, USA

This child item contains Mathworks MATLAB script files which reproduce the processing steps for each dataset. The following scripts are included:
MATLAB scripts to process the images extracted from sUAS videos for each site. See the FGDC metadata Data Quality Section Process Step 1 for details on these scripts:

• ACR_PIVLab_Script.m
• AFR_PIVLab_Script.m
• CCC_PIVLab_Script.m
• CMC_PIVLab_Script.m
• GLR_PIVLab_Script.m
• RMC_PIVLab_Script.m
• SMC_PIVLab_Script.m
• WMD_PIVLab_Script.m

MATLAB scripts to post process the data into the form supplied in this data release. See the FGDC metadata Data Quality Section Process Steps 2 and 3 for details on these scripts:

• CalibrateData.m
• CreatePlots.m

Each Field Site is abbreviated in various files in this data release. File and folder names are used to quickly identify which site a particular file or dataset represents. The following abbreviations are used:

• ACR: Androscoggin River, Auburn, Maine, USA
• AFR: Agua Fria River, near Rock Springs, Arizona, USA
• CCC: Coachella Canal above All-American Canal Diversion, California, USA
• CMC: Cochiti East Side Main Channel, near Cochiti, New Mexico, USA
• GLR: Gila River near Dome, Arizona, USA
• RMC: Reservation Main Canal near Yuma, Arizona, USA
• SMC: Sile Main Canal (at head) at Cochiti, New Mexico, USA
• WMD: Wellton-Mohawk Main Outlet Drain near Yuma, Arizona, USA

Software Requirements To execute the scripts included in this child item, users will need to have the following software:

1. Mathworks MATLAB. Users can install a free trial version of MATLAB by going to the Mathworks site (https://matlab.mathworks.com/).
2. The scripts in this child item have a dependency on the PIVLab open source souftware, version 2.55 or newer. PIVLab can be downloaded from this website: https://pivlab.blogspot.com/

This child item contains bathymetric measurements of the channel geometry suitable for use in computing cross-sectional area for each field site.
Each Field Site is abbreviated in various files in this data release. File and folder names quickly identify which site a particular file or dataset represents. The following abbreviations are used:

• ACS: Anthracite Creek at Somerset, Colorado, USA
• BRA: Blue River below Dillon, Colorado, USA (collected in August 2023)
• BRJ: Blue River below Dillon, Colorado, USA (collected in June 2023)
• CRG: Colorado River below Glenwood Springs, Colorado, USA
• CRR: Colorado River above Roaring Fork River at Glenwood Springs, Colorado, USA
• ERW: Eagle River below Milk Creek near Wolcott, Colorado, USA
• MCA: Maroon Creek near Aspen, Colorado, USA
• RFG: Roaring Fork at Glenwood Springs, Colorado, USA

This child item contains Doppler radar velocimetry spectra measurements for each field site where the radars were deployed.
Each Field Site is abbreviated in various files in this data release. File and folder names quickly identify which site a particular file or dataset represents. The following abbreviations are used:

• ACS: Anthracite Creek at Somerset, Colorado, USA
• BRA: Blue River below Dillon, Colorado, USA (collected in August 2023)
• BRJ: Blue River below Dillon, Colorado, USA (collected in June 2023)
• CRG: Colorado River below Glenwood Springs, Colorado, USA
• CRR: Colorado River above Roaring Fork River at Glenwood Springs, Colorado, USA
• ERW: Eagle River below Milk Creek near Wolcott, Colorado, USA
• MCA: Maroon Creek near Aspen, Colorado, USA
• RFG: Roaring Fork at Glenwood Springs, Colorado, USA

This child item contains information about associating the calibration images and video to real-world distances using ground control points for each field site. The data included here can be used to provide a pixel ground scale distance for each video.
Each Field Site is abbreviated in various files in this data release. File and folder names quickly identify which site a particular file or dataset represents. The following abbreviations are used:

• ACS: Anthracite Creek at Somerset, Colorado, USA
• BRA: Blue River below Dillon, Colorado, USA (collected in August 2023)
• BRJ: Blue River below Dillon, Colorado, USA (collected in June 2023)
• CRG: Colorado River below Glenwood Springs, Colorado, USA
• CRR: Colorado River above Roaring Fork River at Glenwood Springs, Colorado, USA
• ERW: Eagle River below Milk Creek near Wolcott, Colorado, USA
• MCA: Maroon Creek near Aspen, Colorado, USA
• RFG: Roaring Fork at Glenwood Springs, Colorado, USA

The U.S. Geological Survey (USGS) is actively investigating the use of innovative remote-sensing techniques to estimate surface velocity and discharge of rivers in ungaged basins and river reaches that lack the infrastructure to install conventional streamgaging equipment. By coupling discharge algorithms and sensors capable of measuring surface velocity, streamgage networks can be established in regions where data collection was previously impractical or impossible. One of the remote-sensing techniques uses a Doppler (velocity) radar (QCam) mounted and integrated on a small unmanned aircraft system (sUAS or drone). QCam measures the along-track surface velocity by spot dwelling in a river cross section at a vertical where the maximum surface velocity is recorded. To evaluate the extensibility of the method, five science flights were conducted on four rivers of varying size including the Arkansas and South Platte Rivers in Colorado and the Salcha and Tanana Rivers in Alaska. QCam surface velocities and QCam river discharges were compared to conventional streamgaging methods.

Low-altitude (80 and 100 meters above ground level) digital images were taken over an area of the Plum Island Estuary and Parker River National Wildlife Refuge (NWR) in Massachusetts using 3DR Solo unmanned aircraft systems (UAS) on February 27, 2018. These images were collected as part of an effort to document marsh stability over time and quantify sediment movement using UAS technology. Each UAS was equipped with either a Ricoh GRII digital camera for natural color photos, used to produce digital elevation models and ortho images, or a MicaSense RedEdge multi-spectral camera that captures five specific bands of the visible spectrum (blue, green, red, red edge, and near-infrared), which can be used to classify vegetation. The MicaSense camera covered a smaller subsection of the same polygonal area of the marsh that the Ricoh imaged. Some photographs contain black and white targets used as ground control points (GCPs), which were surveyed by a field crew with a high-precision Real Time Kinematic Global Position System. This data release includes the original images from both cameras, as well as a csv file containing the latitude and longitude coordinates, in Universal Transverse Mercator Zone 19N referenced to the North American Datum of 1983, of the ground control points needed to complete any photogrammetry projects using the original photographs, and GPS transect points used to evaluate the photogrammetry products created.

These digital images were taken over an area of the Potomac River in White's Ferry, Maryland using 3DR Solo unmanned aircraft systems (UAS) on October 23, 2019. These images were collected for the purpose of evaluating UAS assessment of river habitat data such as water depth, substrate type, and water clarity. Each UAS was equipped with a FLIR Vue Pro R 640 13mm radiometric thermal camera that provides temperature data embedded in every pixel. Some photographs contain black and white targets used as ground control points (GCPs), which were surveyed by a field crew with a high-precision (GNSS) Global Navigation Satellite System and/or containing internal post processing kinematic (PPK) GPS system. This data release includes the original images from FLIR Vue Pro R 640 13mm radiometric thermal camera of the Potomac River in White's Ferry, Maryland.

These digital images were taken over an area of the Potomac River in Shepherdstown, West Virginia using 3DR Solo unmanned aircraft systems (UAS) on October 21, 2019. These images were collected for the purpose of evaluating UAS assessment of river habitat data such as water depth, substrate type, and water clarity. Each UAS was equipped with a FLIR Vue Pro R 640 13mm radiometric thermal camera that provides temperature data embedded in every pixel. Some photographs contain black and white targets used as ground control points (GCPs), which were surveyed by a field crew with a high-precision (GNSS) Global Navigation Satellite System and/or containing internal post processing kinematic (PPK) GPS system. This data release includes the original images from FLIR Vue Pro R 640 13mm radiometric thermal camera of the Potomac River in Shepherdstown, West Virginia.