Andrew W. Stevens Heather M. Weiner George M. Kaminsky 2019 comma-delimited text data release DOI:10.5066/P9W15JX8 Pacific Coastal and Marine Science Center, Santa Cruz, California U.S. Geological Survey https://doi.org/10.5066/P9W15JX8 https://www.sciencebase.gov/catalog/item/5cb0b0cfe4b0c3b00656d067?name=crlc18_topo.csv Andrew W. Stevens Heather M. Weiner Peter Ruggiero George M. Kaminsky Guy R. Gelfenbaum 2019 data release DOI:10.5066/P9W15JX8 Santa Cruz, CA U.S. Geological Survey https://doi.org/10.5066/P9W15JX8 This portion of the USGS data release presents topography data collected during surveys performed in the Columbia River littoral cell, Washington and Oregon, in 2018 (USGS Field Activity Number 2018-652-FA). Topographic profiles were collected by walking along survey lines with global navigation satellite system (GNSS) receivers mounted on backpacks. Prior to data collection, vertical distances between the GNSS antennas and the ground were measured using a tape measure. Hand-held data collectors were used to log raw data and display navigational information allowing surveyors to navigate survey lines spaced at 100- to 1000-m intervals along the beach. Profiles were surveyed from the landward edge of the study area (either the base of a bluff, engineering structure, or just landward of the primary dune) over the beach foreshore, to wading depth on the same series of transects as nearshore bathymetric surveys that were conducted during the same time period. Additional topographic data were collected between survey lines in some areas with an all-terrain vehicle (ATV) equipped with a GNSS receiver to constrain the elevations and alongshore extent of major morphological features. Positioning data from the survey platforms were referenced to a GNSS base station with known horizontal and vertical coordinates relative to the North American Datum of 1983. Differential corrections from the GNSS base stations to the survey platforms were either applied in real-time with a VHF radio link, or post-processed using Trimble Business Center software. Orthometric elevations relative to the NAVD88 vertical datum were computed using National Geodetic Survey Geoid12a offsets. The average estimated vertical uncertainty of the topographic measurements is 4 cm. The final point data are provided in comma-separated text format and are projected in Cartesian coordinates using the Washington State Plane South, meters coordinate system. Data were obtained to document interannual changes in shoreline position and coastal morphology. These data are intended for science researchers, students, policy makers, and the general public. These data can be used with geographic information systems or other software to identify topographic and shallow-water bathymetric features. Additional information about the field activities from which these data were derived are available online at: https://cmgds.marine.usgs.gov/fan_info.php?fan=2018-652-FA Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. 20180813 20180831 ground condition at time data were collected Complete Not planned -124.1891369 -123.9471275 47.1161309 46.1122613 USGS Metadata Identifier USGS:5cb0b0cfe4b0c3b00656d067 USGS Thesaurus topography GPS measurement ISO 19115 Topic Category elevation Data Categories for Marine Planning Bathymetry and Elevation Marine Realms Information Bank (MRIB) keywords Global Positioning System (GPS) observations Global Change Master Directory (GCMD) GPS (Global Positioning System) None U.S. Geological Survey USGS Coastal and Marine Hazards and Resources Program CMHRP Pacific Coastal and Marine Science Center PCMSC Geographic Names Information System (GNIS) Pacific Ocean Columbia River Clatsop County Pacific County Grays Harbor County none USGS-authored or produced data and information are in the public domain from the U.S. Government and are freely redistributable with proper metadata and source attribution. Please recognize and acknowledge the U.S. Geological Survey as the originator(s) of the dataset and in products derived from these data. This information is not intended for navigational purposes. PCMSC Science Data Coordinator U.S. Geological Survey, Pacific Coastal and Marine Science Center mailing and physical

2885 Mission St.

Santa Cruz CA 95060 831-427-4747 pcmsc_data@usgs.gov MATLAB Version: 9.2.0.556344 (R2017a) Richard C. Daniels Peter Ruggiero Leonard E. Weber 1999 comma-delimited text Olympia, WA Washington State Department of Ecology Publication #99-103 No formal attribute accuracy tests were conducted. All data falls within expected ranges. 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. Survey-grade positions of the survey platforms were achieved with global navigation satellite system (GNSS) receivers and a single GNSS base station placed on a benchmark with published horizontal coordinates relative to the North American Datum of 1983 (Daniels and others, 1999). The horizontal positions of the geodetic reference network meet first-order specifications established by the National Geodetic Survey with a horizontal accuracy of 2 cm or better. Differential corrections from the GNSS base stations to the survey platforms were either applied in real-time with a VHF radio link, or post-processed using Trimble Business Center software. Manufacturer reported accuracy for the differentially corrected horizontal positions for the GNSS rover trajectories is 0.8 cm + 0.5 ppm. Baselines from the GNSS base station varied between 300 m and 12 km with a mean of 3.5 km, suggesting the average horizontal accuracy of survey vessel positions to be about 1 cm. Combining the uncertainty in the benchmark and watercraft yields a total uncertainty of 3 cm. Uncertainty in the horizontal positions associated with sinking into the substrate or variable posture during data collection of the surveyors is unknown. The vertical positions of the geodetic reference network meet 2 cm local ellipsoid height specifications established by the National Geodetic Survey (Daniels and others, 1999). Manufacturer reported accuracy for the differentially corrected vertical positions for the GNSS rover trajectories is 1.5 cm + 1 ppm. Baselines from the GNSS base station varied between 300 m and 12 km with a mean of 3.2 km, suggesting the average vertical accuracy of the survey platforms to be about 1.8 cm relative to the benchmark elevation. Combining the uncertainty in the base station elevation (2 cm) and rover positions yields a total estimated vertical uncertainty of 3.8 cm. Uncertainty in the vertical positions associated with sinking into the substrate or variable posture during data collection of the surveyors is unknown. Topographic profiles were collected on foot with GNSS receivers mounted on backpacks. Prior to data collection, vertical distances between the GNSS antennas and the ground were measured using a tape measure. Hand-held data collectors were used to log raw data and display navigational information allowing surveyors to navigate survey lines spaced at 100- to 1,000-m intervals along the beach. Profiles were surveyed from the landward edge of the study area (either the base of a bluff, engineering structure, or just landward of the primary dune) over the beach foreshore, to wading depth on the same series of transects as nearshore bathymetric surveys that were conducted during the same time period. Additional topographic data were collected between survey lines in some areas with an all-terrain vehicle (ATV) to constrain the elevations and alongshore extent of major morphological features. Raw GNSS data were logged at a measured height above the ground as the ATV traversed the beach. 20180831 Positioning data from the survey platforms that were collected in autonomous mode were post-processed to apply differential corrections from a GNSS base station with known horizontal and vertical coordinates relative to the North American Datum of 1983. Post-processing of raw GNSS data was performed with Trimble Business Center. Orthometric elevations relative to the NAVD88 vertical datum were computed using National Geodetic Survey Geoid12a offsets. The final point data from the topographic surveyors are also projected in cartesian coordinates using the Washington State Plane South, meters coordinate system. 20190328 All available topography data from the survey were compiled into a comma-delimited text file for distribution 20190429 Edits were made to standardize a few of the "None" keywords. 20190620 Susan A Cochran U.S. Geological Survey, Pacific Coastal and Marine Science Center mailing and physical

2885 Mission St.

Santa Cruz CA 95060 United States 831-460-7545 scochran@usgs.gov Edited metadata to add keywords section with USGS persistent identifier as theme keyword. No data were changed. 20201019 U.S. Geological Survey VeeAnn A. Cross Marine Geologist Mailing and Physical

384 Woods Hole Road

Woods Hole MA 02543-1598 508-548-8700 x2251 508-457-2310 vatnipp@usgs.gov Performed minor edits to the metadata to correct typos. No data were changed. 20211013 U.S. Geological Survey Susan A. Cochran Geologist Mailing and Physical

2885 Mission Street

Santa Cruz CA 95060 831-460-7545 scochran@usgs.gov Point Point 343106 0.0000001 0.0000001 Decimal degrees North American Datum of 1983 GRS_1980 6378137.0 298.257222101 North American Vertical Datum of 1988 0.01 meters Explicit elevation coordinate included with horizontal coordinates Attribute Table Table containing attribute information associated with the dataset Producer defined area Designation of sub-area within the Columbia River littoral cell survey area producer defined Clatsop Clatsop sub-area producer defined Long Beach Long Beach sub-area producer defined Grayland Grayland sub-area producer defined North Beach North Beach sub-area producer defined line_number Numeric code identifying the number of the survey line. Data that were not collected along a survey line are labeled "None". Producer defined 001 221 datetime_utc The date and time of data collection in Coordinated Universal Time (UTC). Producer Defined 2018-08-13 14:50:33.000 2018-08-31 19:25:45.000 date and time in mm/dd/yyyy HH:MM:SS.FFF format longitude Longitude coordinate of data point relative to the North American Datum of 1983 Producer defined -124.1891369 -123.9471275 Decimal degrees latitude Latitude coordinate of data point relative to the North American Datum of 1983 Producer defined 46.1122613 47.1161309 Decimal degrees easting_m East coordinate of data point relative to the North American Datum of 1983, projected in the Washington State Plane South, meters, coordinate system Producer defined 219999.75 233619.29 meters northing_m North coordinate of data point relative to the North American Datum of 1983,projected in the Washington State Plane South, meters, coordinate system Producer defined 92418.35 204703.85 meters distance_m Distance along planned survey line. NaN=not a number, because the data were not collected along a pre-defined survey line. Producer defined -1324.71 49.99 meters offline_m Horizontal distance from planned survey line. NaN=not a number, because the data were not collected along a pre-defined survey line. Producer defined -2.98 3.00 meters ellipsoid_ht_m Height in meters of data point with reference to the reference ellipsoid Producer defined -26.64 -6.22 meters ortho_ht_m Height in meters of data point with reference to the North American Vertical Datum of 1988. Producer defined -1.81 17.78 meters U.S. Geological Survey - Science Base U.S. Geological Survey mailing and physical

Denver Federal Center, Building 810, Mail Stop 302

Denver CO 80225 USA 1-888-275-8747 sciencebase@usgs.gov Bathymetry data are available as a comma-delimited text file (crlc18_topo.csv), along with associated FGDC-compliant metadata. 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. comma-delimited text Matlab 9.2.0.556344 text comma-delimited text file 34.82 https://www.sciencebase.gov/catalog/file/get/5cb0b0cfe4b0c3b00656d067?name=crlc18_topo.csv https://www.sciencebase.gov/catalog/item/5cb0b0cfe4b0c3b00656d067 https://www.sciencebase.gov/catalog/item/5caf893ce4b0c3b00654e0c4 https://doi.org/10.5066/P9W15JX8 Data can be downloaded using the Network_Resource_Name links. The first link is a direct link to download the bathymetry data. The second link points to a landing page with all bathymetry data and metadata. The third link points to a landing page for the annual survey. The fourth link points to a landing page for the entire data release. None 20211013 U.S. Geological Survey, Pacific Coastal and Marine Science Center PCMSC Science Data Coordinator mailing and physical

2885 Mission St.

Santa Cruz CA 95060 831-427-4747 pcmsc_data@usgs.gov Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998