Boldt, J.A. 2018 XYZ data release https://doi.org/10.5066/P9ZTCHCW Reston, Virginia U.S. Geological Survey https://doi.org/10.5066/P9ZTCHCW These data are bathymetry (lake bottom elevation) in XYZ format, generated from the April 9–10, 2018, survey of Bourbon Lake and Williams Lake near Loretto, Kentucky. Bathymetric and topographic data were collected using an autonomous underwater vehicle (AUV) and a real-time kinematic global positioning system (GPS). Data were collected as the AUV traversed the lake along planned survey lines, and these data were supplemented by manual GPS shots in a few areas the AUV could not reach. Data collection software integrated and stored the depth and position data from the AUV in real time. Data processing required computer software to extract bathymetry data from the raw data files and to summarize and map the information. Bathymetric data were collected along survey lines within the study area to capture the lake bottom elevation. Elevation-area-volume tables were calculated from these data to provide information for water availability and drought planning. This metadata record is for Bourbon Lake. 20180409 ground condition Complete None planned -85.35708 -85.35205 37.65253 37.64929 None lake bathymetry XYZ USGS Metadata Identifier USGS:5b11ab69e4b092d9651bad8c None Bourbon Lake Loretto Kentucky United States of America None. This dataset is provided by USGS as a public service. Users of this geospatial database and geologic information derived there from should acknowledge the U.S. Geological Survey as the source of the data. Users must assume responsibility to determine the appropriate use of this data. Users should be aware of the limitations of this dataset if using for critical application. U.S. Geological Survey, Ohio-Kentucky-Indiana Water Science Center Justin A. Boldt Hydrologist mailing and physical

9818 Bluegrass Parkway

Louisville KY 40299 USA 502-493-1931 jboldt@usgs.gov Maker's Mark Distillery, Inc. None Unclassified None Microsoft Windows 7 Enterprise 64-bit Service Pack 1; MATLAB R2017a; ESRI ArcMap 10.4.1; HYPACK Version 17.0.34.0 No formal attribute accuracy tests were conducted. No formal logical accuracy tests were conducted. The dataset 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. The AUV on-board differential GPS has sub-meter accuracy. The vertical accuracy was checked with real-time kinematic GPS shots taken at various locations in the survey area. The equipment used for this was a Trimble R8 GNSS receiver with a Trimble TSC3 controller. The mean difference out of 14 check measurements was +0.16 ft. This is likely due to the GPS rod sinking into the ground slightly as the lake bottom was very soft. Overall vertical accuracy is estimated to be +/- 0.25 ft. The bathymetry of the lake was collected with an autonomous underwater vehicle (AUV) and a real-time kinematic GPS. 20180409 The AUV files were post-processed using the EcoMapper Processing and Visualization Toolbox, which is a series of custom scripts written in MATLAB. 20180416 The bathymetry points were combined with digital elevation model (DEM) and GPS points in a geographic information system (GIS). 20180420 A triangulated irregular network (TIN) was created from the bathymetry XYZ file to create a bathymetric surface of the lake. The data were then exported to a comma-delimited XYZ file at a 5-ft data resolution. The XY source was the grid, and the Z source was the TIN. 20180424 An image of the final data was created with HYPACK software. 20180425 The metadata were created. 20180601 Point Entity point 22,531 State Plane Coordinate System 1983 1602 36.73333333 37.93333333 -85.75000000 36.33333333 1640416.66666667 1640416.66666667 coordinate pair 5.0 5.0 feet North American Datum of 1983 WGS-84 6378137.0 298.257223563 North American Vertical Datum of 1988 0.001 feet Explicit elevation coordinate included with horizontal coordinates bathymetry-5ft_Bourbon-Lake_2018-04-09.xyz XYZ HYPACK Easting X-coordinate, State Plane NAD-83, KY-1602 Kentucky South, US Survey Feet International Hydrographic Organization Assigned coordinate value Northing Y-coordinate, State Plane NAD-83, KY-1602 Kentucky South, US Survey Feet International Hydrographic Organization Assigned coordinate value Elevation Z-coordinate, in feet NAVD88 International Hydrographic Organization Assigned coordinate value U.S. Geological Survey - ScienceBase U.S. Geological Survey - ScienceBase mailing and physical

Denver Federal Center, Building 810, Mail Stop 302

Denver CO 80225 USA 1-888-275-8747 sciencebase@usgs.gov Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this information product, for the most part, is in the public domain, it also contains copyrighted materials as noted in the text. Permission to reproduce copyrighted items must be secured from the copyright owner whenever applicable. The data have been approved for release and publication by the U.S. Geological Survey (USGS). Although the data have been subjected to rigorous review and are substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, the data are released on the condition that neither the USGS nor the U.S. Government may be held liable for any damages resulting from authorized or unauthorized use. Although the data have been processed successfully on a computer system at the U.S. Geological Survey, 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 U.S. Geological Survey shall not be held liable for improper or incorrect use of the data described and/or contained herein. Users of the data are advised to read all metadata and associated documentation thoroughly to understand appropriate use and data limitations. XYZ 1.0 This page contains an XYZ file (.xyz) as well as the associated metadata file (.xml) and an image (.png) of the data for the bathymetric survey of Bourbon Lake on April 9, 2018. https://doi.org/10.5066/P9ZTCHCW None 20200827 U.S. Geological Survey, Ohio-Kentucky-Indiana Water Science Center Justin A. Boldt Hydrologist mailing and physical

9818 Bluegrass Parkway

Louisville KY 40299 USA 502-493-1931 jboldt@usgs.gov FGDC Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998