Andrew W. Stevens Renee K. Takesue Eric E. Grossman 20200721 comma-delimited text data release DOI:10.5066/P9N9K2I1 Pacific Coastal and Marine Science Center, Santa Cruz, California U.S. Geological Survey https://doi.org/10.5066/P9N9K2I1 https://www.sciencebase.gov/catalog/item/5ebad8f082ce25b51361807a Andrew W. Stevens Renee K. Takesue Eric E. Grossman 2020 data release DOI:10.5066/P9N9K2I1 Pacific Coastal and Marine Science Center, Santa Cruz, California U.S. Geological Survey https://doi.org/10.5066/P9N9K2I1 This portion of the USGS data release presents eelgrass distributions derived from towed underwater video surveys of the Nisqually River delta, Washington in 2012 (USGS Field Activity Number D-01-12-PS). Eelgrass data were collected from the R/V George Davidson equipped with a towed underwater video system and global navigation satellite system (GNSS) receiver. The underwater video system consisted of a Splashcam standard definition video camera connected to a Sony GV-D1000 video monitor and tape recorder. Positioning of the survey vessel was determined at 1 Hz intervals using a Trimble R7 GNSS receiver and Trimble Zephyr Model 2 antenna. The positioning data from the GNSS were encoded onto the audio track of the digital video recording using Red Hen Systems (RHS) VMS200 hardware. Underwater video data were recorded as the vessel navigated along a series of shore-perpendicular transects at speeds between 1 and 2 knots. The underwater video recording was later reviewed and the presence or absence of eelgrass was determined for each 1-s segment of video tape. These data were used to evaluate the classification of single-beam sonar data acquired during the same time period. Data were obtained to document interannual changes in eelgrass distributions following the removal of a dike that restored tidal processes to over 300 ha of former freshwater wetlands on the Nisqually River delta in 2009. 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 distributions of eelgrass. 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=D0112PS Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. 20120219 20120219 ground condition at time data were collected Complete Not planned -122.7510110 -122.6826760 47.1199380 47.1069810 USGS Metadata Identifier USGS:5ebad8f082ce25b51361807a USGS Thesaurus aquatic vegetation sea-floor characteristics GPS measurement underwater photography ISO 19115 Topic Category biota Data Categories for Marine Planning Flora Marine Realms Information Bank (MRIB) keywords video observation None U.S. Geological Survey USGS Coastal and Marine Hazards and Resources Program CMHRP Pacific Coastal and Marine Science Center PCMSC USGS Coastal Habitats in Puget Sound Project (CHIPS) Geographic Names Information System (GNIS) Salish Sea Puget Sound Pierce County Thurston County Nisqually River Billy Frank Jr Nisqually National Wildlife Refuge 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 Street

Santa Cruz CA 95060 831-427-4747 pcmsc_data@usgs.gov MATLAB Version: 9.6.0.1214997 (R2019a) Ann Gibbs Eric Grossman Bruce Richmond 2005 comma-delimited text Reston, VA U.S. Geological Survey https://pubs.usgs.gov/of/2005/1244/ 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. Positioning of the survey vessel was achieved with a global navigation satellite system (GNSS) differentially corrected with data from a single GNSS base station. The average estimated horizontal accuracy of the GNSS-derived vessel positions is 5 cm. However, horizontal offsets between the underwater video camera and the shipboard GNSS antenna, or layback, was observed during data collection. The layback of the video camera is estimated to be no greater than 15 m based on calculations for a similar camera system given in Gibbs and others, 2005. No formal positional accuracy tests were conducted Eelgrass distribution data were collected from the R/V George Davidson equipped with a towed underwater video system and global navigation satellite system (GNSS) receiver. The underwater video system consisted of a Splashcam standard definition video camera connected to a Sony GV-D1000 video monitor and tape recorder. Positioning of the survey vessel was determined at 1-Hz intervals using a Trimble R7 GNSS receiver and Trimble Zephyr Model 2 antenna. The positioning data from the GNSS were encoded onto the audio track of the digital video recording using Red Hen Systems (RHS) VMS200 hardware. Underwater video data were recorded as the vessel navigated along a series of shore-perpendicular transects at speeds between 1 and 2 knots. 20120219 The underwater video recording was reviewed and the presence or absence of eelgrass was determined for each 1-s segment of video tape. All available eelgrass distribution data from the survey were compiled into a comma-delimited text file for distribution. 20200512 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 2810 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 datetime_utc The date and time of data collection in Coordinated Universal Time (UTC). Producer Defined 2012-02-19 18:41:53 2012-02-19 23:34:30 date and time in yyyy-mmm-dd HH:MM:SS format longitude Longitude coordinate of data point relative to the North American Datum of 1983 Producer defined -122.7510110 -122.6826760 Decimal degrees latitude Latitude coordinate of data point relative to the North American Datum of 1983 Producer defined 47.1069810 47.1199380 Decimal degrees easting_m East coordinate of data point relative to the North American Datum of 1983, projected in the Universal Transverse Mercator (UTM) Zone 10 North, meters, coordinate system Producer defined 518887.16 524075.76 meters northing_m North coordinate of data point relative to the North American Datum of 1983,projected in the Universal Transverse Mercator (UTM) Zone 10 North, meters, coordinate system Producer defined 5217098.04 5218522.77 meters tape_id Numeric identifier for the physical digital-8 tape used to record the underwater video data Producer defined 1 1 meters veg_flag Flag that indicates the presence or absence of eelgrass at each location along the survey track producer defined 0 eelgrass absent producer defined 1 eelgrass present producer defined 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 Eelgrass distribution data are available as a comma-delimited text file, 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 9.6.0.1214997 text comma-delimited text file 0.21 https://www.sciencebase.gov/catalog/file/get/5ebad8f082ce25b51361807a?name=nq12_video.csv https://www.sciencebase.gov/catalog/item/5ebad8f082ce25b51361807a https://www.sciencebase.gov/catalog/item/5e97383a82ce172707f2a9b7 https://doi.org/10.5066/P9N9K2I1 Data can be downloaded using the Network_Resource_Name links. The first link is a direct link to download the eelgrass distribution data. The second link points to a landing page with all eelgrass distribution 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 20201019 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 Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998