Joshua B. Logan Eric E. Grossman Nathan R. VanArendonk Avery F.G. Maverick 20210222 comma-delimited text data release DOI:10.5066/P94LH20J Pacific Coastal and Marine Science Center, Santa Cruz, California U.S. Geological Survey https://doi.org/10.5066/P94LH20J https://www.sciencebase.gov/catalog/item/5ef522f382ced62aaae6a01e Joshua B. Logan Eric E. Grossman Nathan R. VanArendonk Avery F.G. Maverick 2021 data release DOI:10.5066/P94LH20J Pacific Coastal and Marine Science Center, Santa Cruz, CA U.S. Geological Survey https://doi.org/10.5066/P94LH20J https://www.sciencebase.gov/catalog/item/5f2c568b82ceae4cb3c2cffc This portion of the data release presents the locations of the temporary ground control points (GCPs) used for the structure-from-motion (SfM) processing of the imagery collected during an unmanned aerial system (UAS) survey of the intertidal zone at Post Point, Bellingham Bay, WA on 2019-06-06. Nineteen temporary ground control points (GCPs) were distributed throughout each survey area to establish survey control. The GCPs consisted of a combination of small square tarps with black-and-white cross patterns and "X" marks placed on the ground using temporary chalk. The GCP positions were measured using post-processed kinematic (PPK) GPS, using corrections from a GPS base station located approximately 5 kilometers from the study area. The GCP positions are presented in a comma-delimited text file. These data were collected to characterize the morphology, substrate composition and roughness of intertidal areas to support modeling of coastal storm and wave impacts with sea-level rise as part of the USGS Puget Sound Coastal Storm Modeling System (PS-CoSMoS). The data are also intended to be used to model and evaluate sediment transport and its effects on coastal habitats, a focus of the USGS Coastal Habitats in Puget Sound Project (CHIPS) and its partners to inform resource management and adaptive planning for our Nation's coasts. Additional information about the field activity from which these data were derived is available online at: http://cmgds.marine.usgs.gov/fan_info.php?fan=2019-623-FA Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. 20190606 ground condition at time data were collected Complete None planned -122.5198 -122.4790 48.7553 48.7117 ISO 19115 Topic Category elevation geoscientificInformation Data Categories for Marine Planning Bathymetry and Elevation USGS Thesaurus topography topographic maps remote sensing geomorphology aerial photography image mosaics geospatial datasets Marine Realms Information Bank (MRIB) keywords photography remote sensing aerial and satellite photography altimetry orthophotography coastal processes None U.S. Geological Survey USGS Coastal and Marine Hazards and Resources Program CHMRP Pacific Coastal and Marine Science Center PCMSC Unmanned aerial system UAS Structure-from-motion SfM USGS Metadata Identifier USGS:5ef522f382ced62aaae6a01e Geographic Names Information System (GNIS) State of Washington Whatcom County Bellingham South Bellingham Fairhaven Puget Sound Salish Sea Bellingham Bay Post Point 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 navigation purposes. U.S. Geological Survey, Pacific Coastal and Marine Science Center PCMSC Science Data Coordinator mailing and physical

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Santa Cruz CA 95060 831-427-4747 pcmsc_data@usgs.gov https://www.sciencebase.gov/catalog/file/get/5ef522f382ced62aaae6a01e?name=PostPoint_2019-06-06_GCP_browse.jpg Aerial image showing examples of ground control points used for the UAS survey. JPEG Microsoft Windows 10, Trimble Access, Trimble Business Center. No formal attribute accuracy tests were conducted. No formal logical accuracy tests were conducted. 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. GCP positions were measured using survey-grade dual-frequency GPS receivers operating in post-processed-kinematic (PPK) mode. The GPS receivers were placed on short fixed-height tripods and set to occupy each GCP for a minimum occupation time of one minute. The PPK corrections were referenced to a Continuously Operating Reference Stations (CORS) operated by the Washington State Reference Network (WSRN) located approximately 5 kilometers from the study area ('BELI'). The mean reported horizontal precision of these measurements was 0.019 meters, (standard deviation of 0.004), suggesting a total horizontal accuracy of about 0.020 meters. Uncertainty in the horizontal positions associated with tripod centering, antenna height measurement errors, and errors from the weight of the tripod settling onto the GCP tarp during data collection, and possible subsequent rebound of the center of the tarp after removal is unknown. GCP positions were measured using survey-grade dual-frequency GPS receivers operating in post-processed-kinematic (PPK) mode. The GPS receivers were placed on short fixed-height tripods and set to occupy each GCP for a minimum occupation time of one minute. The PPK corrections were referenced to a Continuously Operating Reference Stations (CORS) operated by the Washington State Reference Network (WSRN) located approximately 5 kilometers from the study area ('BELI'). The mean reported horizontal precision of these measurements was 0.026 meters, (standard deviation of 0.005), suggesting a total vertical accuracy of about 0.030 meters. Uncertainty in the vertical positions associated with the weight of the tripod settling onto the GCP tarp during data collection, and possible subsequent vertical rebound of the center of the tarp after removal is unknown. Ground control was established using ground control points (GCPs) consisting of small square tarps with black-and-white cross patterns and temporary chalk 'X' marks placed on the ground surface throughout the survey area. The GCP positions were measured using survey-grade GPS receivers operating in post-processed-kinematic (PPK) mode. The GPS receivers were placed on short fixed-height tripods and set to occupy each GCP for a minimum occupation time of one minute. The PPK corrections were referenced to a Continuously Operating Reference (CORS) GPS base station ('BELI') located approximately 5 kilometers from the study area operated by the Washington State Reference Network (WSRN). 2019 Joshua Logan U.S. Geological Survey, Pacific Coastal and Marine Science Center mailing and physical

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Santa Cruz CA 95060 831-460-7519 jlogan@usgs.gov Point Point 20 Universal Transverse Mercator 10 0.9996 -123.0 0.0 500000.0 0.0 coordinate pair 0.001 0.001 meters NAD83 (National Spatial Reference System 2011) (EPSG:1116) GRS 1980 (EPSG:7019) 6378137.0 298.257222101 North American Vertical Datum of 1988 (EPSG:5703), derived using GEOID12B 0.001 meters Explicit elevation coordinate included with horizontal coordinates Attribute Table Table containing attribute information associated with the dataset Producer defined pid Point ID producer defined A unique identification code for the point. northing_utmz10_m Northing coordinate of data point relative to the NAD83 (National Spatial Reference System 2011) datum, projected in the Universal Transverse Mercator (UTM) Zone 10 North coordinate system, meters (EPSG:6339) Producer defined 5395521.046 5400381.200 meters easting_utmz10_m Easting coordinate of data point relative to the NAD83 (National Spatial Reference System 2011) datum, projected in the Universal Transverse Mercator (UTM) Zone 10 North coordinate system, meters (EPSG:6339) Producer defined 535322.666 538296.879 meters orthometric_ht_navd88_m Orthometric height of data point in meters relative to the North American Vertical Datum of 1988 (EPSG:5703), derived using the National Geodetic Survey GEOID12B. Producer defined -0.409 32.404 meters latitude_dd Latitude in decimal degrees, relative to the NAD83 (National Spatial Reference System 2011) datum (EPSG:1116). Producer defined 48.71171531 48.75526440 decimal degrees longitude_dd Longitude in decimal degrees, relative to the NAD83 (National Spatial Reference System 2011) datum (EPSG:1116). Producer defined -122.51982037 -122.47895461 decimal degrees ellipsoid_ht_m Ellipsoid height in meters, referenced to the GRS 1980 ellipsoid (EPSG:7019). Producer defined -22.091 10.893 meters U.S. Geological Survey - ScienceBase mailing address

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Denver CO 80225 United States 1-888-275-8747 sciencebase@usgs.gov The GCP locations are available in a comma-delimited text format. 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 Notepad++ v 7.8.6 The csv file contains coordinates of ground control point locations. No compression applied 0.004 https://www.sciencebase.gov/catalog/file/get/5ef522f382ced62aaae6a01e?name=PostPoint_2019-06-06_GCP.csv https://www.sciencebase.gov/catalog/item/5ef522f382ced62aaae6a01e https://doi.org/10.5066/P94LH20J Data can be downloaded using the Network_Resource_Name links. The first link is a direct link to the comma-delimited text file. The second link points to a landing page with the comma-delimited text file, metadata, and browse image. The third link points to the landing page for the entire data release, including links to pages of the various data files. None. The downloadable data file is available in comma-separated values (CSV) spreadsheet format. Text editing software can be used to open the file, as well as spreadsheet programs, such as Microsoft Excel. 20210222 U.S. Geological Survey, Pacific Coastal and Marine Science Center PCMSC Science Data Coordinator mailing and physical

2885 Mission Street

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