Joshua B. Logan 2017 comma-delimited text data release DOI:10.5066/F7RN362H Pacific Coastal and Marine Science Center, Santa Cruz, California U.S. Geological Survey https://doi.org/10.5066/F7RN362H https://www.sciencebase.gov/catalog/file/get/58c9b834e4b0849ce97b4bd8?name=NPSADrifterCSVFiles_namedwithLCLStart.zip Kurt J. Rosenberger Curt D. Storlazzi 2017 data release DOI:10.5066/F7RN362H Pacific Coastal and Marine Science Center, Santa Cruz, CA U.S. Geological Survey https://doi.org/10.5066/F7RN362H Satellite-tracked, DGPS-equipped Lagrangian surface-current drifter deployments were conducted over 12 weeks between 14 April and 7 July 2015 at various locations within and offshore of the National Park of American Samoa study area to track surface currents. The drifters internally logged their location every 1 minute, and they transmitted their positions to satellites every 5 minutes. A drogue was attached to the drifters at 1 m below sea level in order to track the currents at that depth. These drifter deployments were conducted as a part of a larger investigation into the circulation and transport along the coast off the National Park of American Samoa on the island of Tutuila, American Samoa. Additional information about the field activities from which these data were derived are available online at: http://cmgds.marine.usgs.gov/2015-601-FA Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. 20150414 20150707 ground condition at time data were collected Complete None planned] -170.762114 -170.623177 -14.204308 -14.296368 USGS Metadata Identifier USGS:58c9b834e4b0849ce97b4bd8 ISO 19115 Topic Category Oceans geoscientificInformation Data Categories for Marine Planning Water Column Features USGS Thesaurus Ocean Circulation Global Change Master Directory (GCMD) CORAL REEFS OCEAN CURRENTS Marine Realms Information Bank (MRIB) keywords Physical Oceanography Geographic Names Information System (GNIS) Samoa Islands National Park of American Samoa Territory of American Samoa Tutuila Island 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 and National Park Service 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 address

2885 Mission Street

Santa Cruz CA 95060-5792 USA 831-427-4747 pcmsc_data@usgs.gov https://www.sciencebase.gov/catalog/file/get/58c9b834e4b0849ce97b4bd8?name=NPSADrifterPlot.jpg&allowOpen=true Plot of all deployments of drifter tracks JPEG Staff of the National Park of American Samoa contributed to the deployment of the drifters over the time period of deployments. Data were plotted in ArcGIS. Curt D. Storlazzi Olivia M. Cheriton Joshua B. Logan Timothy B. Clark 2017 https://doi.org/10.3133/ofr20171060 Data were plotted in ARC/GIS to ensure that only data points that represent the period that each drifter was free-floating are included, and extraneous points were removed (such as points on land or on the research vessel). 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. Horizontal positional accuracy provided by the manufacturer (Pacific Gyre) is +/- 10 meters Data were imported into Matlab to parse the data from one data file into individual drifter deployments. Distance, azimuth and drifter velocity were calculated using the GPS fixes. derivation of speed 20170118 Edited attribute resolution on two attributes to be numeric only (from "1 second" to "1"). Updated Point of Contact and Metadata Contact information. No data were changed. 20190507 Susan A. Cochran Pacific Coastal and Marine Science Center Assistant Deputy Center Director mailing and physical

2885 Mission Street

Santa Cruz CA 95060 USA 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 Point Point 8910 0.000001 0.000001 Decimal degrees D_WGS_1984 WGS_1984 6378137.0 298.257223563 ASCII Table Comma-delimited ascii table of time, position, distance and direction travelled, and speed of ocean Lagrangian drifter. Producer defined DT_UTC Date and time referenced to Universal Coordinated Time Global Positioning System 14-Apr-2015 00:00:00 07-Jul-2015 23:59:59 seconds 1 DT_LCL Date and time referenced to Local Time Global Positioning System 14-Apr-2015 00:00:00 07-Jul-2015 23:59:59 seconds 1 LAT Latitude in decimal degrees Global Positioning System -14.285861 -14.191470 decimal degrees 0.000001 LON Longitude in decimal degrees Global Positioning System -170.733699 -170.651163 decimal degrees 0.000001 UTMX X-coordinate in Universal Transverse Mercator Projection, Zone 2 Global Positioning System 8420640.8 8431075.6 Meters 0.1 UTMY Y-coordinate in Universal Transverse Mercator Projection, Zone 2 Global Positioning System 528725.1 537629.9 Meters 0.1 UTMZONE UTM Zone for this latitude/longitude Global Positioning System UTM Zone Zone Number unknown DIST_M Along-track distance travelled between point x and point x-1 Global Positioning System 0 181.5 Meters 0.1 AZIMUTH Azimuth of distance travelled between point x and point x-1 Global Positioning System 0 360 Degrees 1 VEL_MS Velocity of drifter between point x and point x-1 Global Positioning System 0 2 Meters per second 0.1 VEL_KTS Velocity of drifter between point x and point x-1 Global Positioning System 0 4 Nautical miles per hour (knots) 0.1 The first line of the csv file is a header line. 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 This zip file (NPSADrifterCSVFiles_namedwithLCLStart.zip) contains 26 individual .csv files, one for each drifter deployment. The files names represent YYYY-MM-DD-HHMMSS (local time) and drifter number. 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. csv Zip file contains the csv tables for each individual drifter deployment. Windows users can use WinZIP to uncompress the files; Apple Macintosh users, Archive Utility; Linux and Unix users, gunzip. .280 https://www.sciencebase.gov/catalog/item/58c9b834e4b0849ce97b4bd8?name=NPSADrifterCSVFiles_namedwithLCLStart.zip http://doi.org/10.5066/F7RN362H Data can be downloaded via the Internet None. These data can be viewed with any text editor software. 20201019 U.S. Geological Survey, Pacific Coastal and Marine Science Center PCMSC Science Data Coordinator mailing and physical

2885 Mission Street

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