Andrew W. Stevens Joshua B. Logan Daniel J. Hoover Alexander G. Snyder 2017 comma-delimited text data release DOI:10.5066/F76H4GCW Pacific Coastal and Marine Science Center, Santa Cruz, California U.S. Geological Survey https://doi.org/10.5066/F76H4GCW https://www.sciencebase.gov/catalog/file/get/59cc2436e4b017cf314249a0?name=mb14_oct_topo.csv Andrew W. Stevens Joshua B. Logan Alexander G. Snyder Daniel J. Hoover Patrick L. Barnard Jonathan A. Warrick 2017 data release DOI:10.5066/F76H4GCW Santa Cruz, CA U.S. Geological Survey https://doi.org/10.5066/F76H4GCW This part of the data release presents topography data from northern Monterey Bay, California collected in October 2014. Topography data were collected on foot with survey-grade global navigation satellite system (GNSS) receivers mounted on backpacks and with an all-terrain vehicle (ATV) using a GNSS receiver mounted at a measured height above the ground. Data were obtained to document changes in shoreline position and coastal morphology as they relate to episodic (storms), seasonal, interannual, and longer (for example, El Niño) processes. 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: http://cmgds.marine.usgs.gov/fan_info.php?fan=2014-676-FA Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. 20141020 20141024 ground condition at time data were collected Complete Not planned -122.029880 -121.788990 36.978940 36.807609 USGS Metadata Identifier USGS:59cc2436e4b017cf314249a0 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 Geology Program CMGP Pacific Coastal and Marine Science Center PCMSC Geographic Names Information System (GNIS) Pacific Ocean Monterey Bay Monterey County Santa Cruz 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. Andrew W. Stevens U.S. Geological Survey, Pacific Coastal and Marine Science Center Oceanographer mailing and physical

2885 Mission St.

Santa Cruz CA 95060 USA 831-460-7424 astevens@usgs.gov Repeatability tests were conducted across different survey platforms, but no comparisons to "true" values 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. The position of the GNSS base station was derived from two static GNSS occupations on January 14 and January 16, 2014, with durations of 6 and 3 hours, respectively. The static observations were processed using the National Geodetic Survey Online Positioning User Service (OPUS) and averaged to derive the final base station coordinates relative to the North American Datum of 1983 (2011 realization). Post-processing of raw GNSS data was performed with Trimble Business Center and Waypoint Grafnav, for the backpack- and ATV- platforms, respectively. 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 1.5 km and 29 km with a mean of 13 km, suggesting an average horizontal accuracy of about 1.5 cm. Uncertainty in the horizontal positions associated with sinking into the substrate or variable posture during data collection of the surveyors is unknown. 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 1.5 km and 29 km with a mean of 13 km, suggesting the average vertical accuracy of topographic measurements to be about 3 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 50- to 250-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 with an all-terrain vehicle (ATV) to constrain the elevations and alongshore extent of major morphological features. Raw GNSS data were logged internally at 1-Hz intervals using a GNSS receiver mounted at a measured height above the ground. 20141023 Positioning data from the survey platforms 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 (2011 realization). Post-processing of raw GNSS data was performed with Trimble Business Center and Waypoint Grafnav, for the backpack- and ATV- platforms, respectively. 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 projected in cartesian coordinates using the Universal Transverse Mercator (UTM), Zone 10 North, meters coordinate system. 20150916 All available topography data from the survey were compiled into a comma-delimited text file for distribution 20170925 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 Point Point 128043 0.000001 0.000001 Decimal degrees North American Datum of 1983, 2011 realization GRS_1980 6378137.0 298.257222101 North American Vertical Datum of 1988 0.001 meters Explicit elevation coordinate included with horizontal coordinates Attribute Table Table containing attribute information associated with the dataset Producer defined Date and Time (yyyy-mm-dd HH:MM:SS.FFF) The date and time of data collection in Greenwich Mean Time (GMT). Producer Defined 2014-10-20 19:06:05.000 2014-10-24 02:06:47.000 date and time in mm/dd/yyyy HH:MM:SS.FFF format Longitude (deg. E) Longitude coordinate of data point relative to the North American Datum of 1983 (2011 realization) Producer defined -122.029880 -121.788990 Decimal degrees Latitude (deg. N) Latitude coordinate of data point relative to the North American Datum of 1983 (2011 realization) Producer defined 36.807609 36.978940 Decimal degrees Easting (m) East coordinate of data point relative to the North American Datum of 1983 (2011 realization), projected in the Universal Transverse Mercator (UTM), Zone 10 North, meters, coordinate system Producer defined 586373.118 608020.064 meters Northing (m) North coordinate of data point relative to the North American Datum of 1983 (2011 realization), projected in the Universal Transverse Mercator (UTM), Zone 10 North, meters, coordinate system Producer defined 4074212.918 4093062.581 meters Ellipsoid Height (m) Height in meters of data point with reference to the reference ellipsoid Producer defined -34.088 -18.050 meters Orthometric Height (m) Height in meters of data point with reference to the North American Vertical Datum of 1988. Producer defined -0.299 15.388 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 Topography data are available as a comma-delimited text file (mb14_oct_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 10.26 https://www.sciencebase.gov/catalog/file/get/59cc2436e4b017cf314249a0?name=mb14_oct_topo.csv https://doi.org/10.5066/F76H4GCW Data can be downloaded via the Internet None 20201019 Andrew W. Stevens U.S. Geological Survey, Pacific Coastal and Marine Science Center Oceanographer mailing and physical

2885 Mission St.

Santa Cruz CA 95060 USA 831-460-7424 astevens@usgs.gov Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998