Eric E. Grossman Peter Dartnell David P. Finlayson 2018 TIFF data release DOI:10.5066/F7JM27VN Pacific Coastal and Marine Science Center, Santa Cruz, California U.S. Geological Survey https://doi.org/10.5066/F7JM27VN https://www.sciencebase.gov/catalog/item/59bae410e4b091459a563d48 Eric E. Grossman Peter Dartnell David P. Finlayson 2018 data release DOI:10.5066/F7JM27VN Pacific Coastal and Marine Science Center, Santa Cruz, CA U.S. Geological Survey https://doi.org/10.5066/F7JM27VN https://www.sciencebase.gov/catalog/item/59b0579ae4b020cdf7d6e344 These metadata describe the U.S. Geological Survey (USGS), Pacific Coastal and Marine Science Center (PCMSC) 2005 bathymetry data collected in Skagit Bay Washington that is provided as a 1-m resolution TIFF image, as well as a 1-m resolution shaded-relief TIFF image. In 2004, 2005, 2007, and 2010 the U.S. Geological Survey (USGS), Pacific Coastal and Marine Science Center (PCMSC) collected bathymetry and acoustic backscatter data in Skagit Bay, Washington using an interferometric bathymetric sidescan sonar system mounded to the USGS R/V Parke Snavely and the USGS R/V Karluk. The research was conducted in coordination with the Swinomish Indian Tribal Community, Skagit River System Cooperative, Skagit Watershed Council, Puget Sound Nearshore Ecosystem Restoration Project, and U.S. Army Corps of Engineers to characterize estuarine habitats and processes, including the sediment budget of the Skagit River and the influence of river-delta channelization on sediment transport. Information quantifying the distribution of habitats and extent that sediment transport influences habitats and the morphology of the delta is useful for planning for salmon recovery, agricultural resilience, flood risk protection, and coastal change associated with sea-level rise. 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 bathymetric features. These data are not intended to be used for navigation. Additional information about the field activities from which these data were derived is available online at: https://cmgds.marine.usgs.gov/fan_info.php?fan=K104PS https://cmgds.marine.usgs.gov/fan_info.php?fan=K205PS https://cmgds.marine.usgs.gov/fan_info.php?fan=K107PS https://cmgds.marine.usgs.gov/fan_info.php?fan=S410PS Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this Federal Geographic Data Committee-compliant metadata file is intended to document the data set in nonproprietary form, as well as in Esri format, this metadata file may include some Esri-specific terminology. 2005 2005 ground condition at time data were collected. Complete As needed -122.568 -122.448 48.396 48.276 USGS Metadata Identifier USGS:59bae410e4b091459a563d48 Global Change Master Directory (GCMD) Bathymetry Seafloor Topography ISO 19115 Topic Category geoscientificInformation environment imageryBaseMapsEarthCover USGS Thesaurus Bathymetry sea-floor acoustic reflectivity Geology Data Categories for Marine Planning Bathymetry and Elevation Marine Realms Information Bank (MRIB) keywords seabed None U.S. Geological Survey USGS Coastal and Marine Geology Program CMGP Pacific Coastal and Marine Science Center PCMSC Geographic Names Information System (GNIS) State of Washington Puget Sound Skagit Bay 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 originators of the dataset and in products derived from these data. This information is not intended for navigation purposes. Peter Dartnell U.S. Geological Survey, Pacific Coastal and Marine Science Center Physical Scientist mailing and physical

2885 Mission Street

Santa Cruz CA 95060 831-460-7415 831-427-4748 pdartnell@usgs.gov https://www.sciencebase.gov/catalog/file/get/59c16044e4b091459a5faec5?name=SkagitBay_2005_QV.jpg&allowOpen=true quick view image of 2005 Skagit Bay bathymetry data JPEG Caris HIPS and SIPS (ver. 9) and ArcMap (ver. 10.3.1) on a Windows 7 computer. Not applicable for raster data. 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. Estimated to be no less than 1 m, owing to water depth and total propagated uncertainties of the mapping systems, which include sonar system, position and motion compensation system, and navigation, as well as data processing that includes sounding cleaning, gridding, and datum transformations. Estimated to be no less than 0.5% water depth, owing to water depth and total propagated uncertainties of the mapping systems, which include sonar system, position and motion compensation system, and navigation, as well as data processing that includes sounding cleaning, gridding, and datum transformations. In 2005 the USGS, PCMSC mapped a portion of Skagit Bay within Puget Sound, Washington. A 234-kHz interferometric bathymetric sidescan sonar system was pole-mounted to the USGS, PCMSC R/V Karluk. In 2017 the USGS, PCMSC downloaded the 2005 survey line files from the USGS archives. The survey line files were imported into Caris HIPS and SIPS software (version 9). Soundings were cleaned of obvious incorrect data and manual sound veolocity corrections were applied on some lines. The data were then gridded into a 1-m resolution base surface using the swath angle method. The base surface was exported as a TIFF file in UTM-10 coordinates referenced to the WGS84 ellipsoid. The TIFF file was imported into a Geographic Information System (ESRI, ArcMap) and converted to a grid, then converted to an ASCII XYZ file using Fledermaus software. The XYZ file coordinates and depths were transformed to NAD83 coordinates relative to NAVD88 depths using V-Datum software (version 3.7). The new XYZ file was gridded into a 1-m surface using Fledermaus software, exported as an ASCIIRaster file, imported into a GIS and then export as a TIFF file in UTM, zone 10 NAD83 coordinates relative to NAVD88. Also, a shaded relief bathymetry grid was generated from the bathymetry data using the ESRI, ArcMap 'hillshade' tool. The grid was then exported as a TIFF file in UTM zone 10, NAD-83 coordinates. The image does not contain depth/elevation information. 2017 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 Raster Grid Cell 15941 9184 1 Universal Transverse Mercator 10 0.9996 -123.00000 0.00000 500000.0 0.00 coordinate pair 1.0 1.0 Meters NAD83 GRS80 6378137.00 298.257223563 North American Datum 1983 0.1 meters Explicit elevation coordinate included with horizontal coordinates value depth in meters relative to NAVD88 Producer defined The complete 1-m resolution 2005 Skagit Bay bathymetry grid was originally archived as a TIFF image with the following attributes. >Cell size = 1.0 >Number of rows = 15941 >Number of columns = 9184 > >Data type = floating point > >Boundary >Xmin = 531268 >Xmax = 540452 >Ymin = 5344416 >Ymax = 5360357 > >Statistics >Minimum value = -106.73 >Maximum value = 1.86 >Mean = -19.77 >Standard deviation = 17.29 > >Coordinate system description >Projection UTM >Zone 10 >Datum NAD83 >Vertical Reference NAVD88 >Units meter U.S. Geological Survey U.S. Geological Survey - ScienceBase Mailing and Physical

Denver Federal Center, Building 810, Mail Stop 302

Denver CO 80225 1-888-275-8747 sciencebase@usgs.gov These data are available in TIFF format (skagitbay_2005_bathmetry_1m_utm10_nad83_navd88.tif) contained in a single zip file (skagitbay_2005_bathymetry_1m_utm10_nad83_navd88.zip), which includes a tif world file (.tfw) and CSDGM FGDC-compliant metadata. A shaded-relief version (skagitbay_2005_shadedrelief_1m_utm10_nad83.tif) is contained in a second zip file (skagitbay_2005_shadedrelief_1m_utm10_nad83.zip), which also includes a tif world file (.tfw) and CSDGM 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. TIFF ArcMap (version 10.3.1) The .zip files contains the TIFF (.tif), the projection file (.tfw), and the XML (.xml) version of the metadata. WinZip 14.5 https://www.sciencebase.gov/catalog/file/get/59bae410e4b091459a563d48?name=skagitbay_2005_bathymetry_1m_utm10_nad83_navd88.zip https://doi.org/10.5066/F7JM27VN Data can be downloaded via the Internet TIFF ArcMap (version 10.3.1) The .zip files contains the TIFF (.tif), the projection file (.tfw), and the XML (.xml) version of the metadata. WinZip 7 https://www.sciencebase.gov/catalog/file/get/59bae410e4b091459a563d48?name=skagitbay_2005_shadedrelief_1m_utm10_nad83.zip https://doi.org/10.5066/F7JM27VN Data can be downloaded via the Internet None. The downloadable data file has been compressed with the "zip" command and can be unzipped with Winzip (or other tool) on Windows systems. To utilize these data, the user must have software capable of uncompressing the WinZip file and importing and viewing a TIFF file. 20201019 Peter Dartnell U.S. Geological Survey, Pacific Coastal and Marine Science Center Physical Scientist mailing and physical

2885 Mission Street

Santa Cruz CA 95060 United States of America 831-460-7415 pdartnell@usgs.gov Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998