UNH/CCOM-JHC : Center for Coastal and Ocean Mapping/Joint Hydrographic Center, University of New Hampshire 2010-09-20 Gridded (100 m/pixel) full coverage, processed Acoustic Backscatter Data of the western insular margins of the Northern Mariana Islands and Guam. Data were first reduced for position, elevation, orientation, water-column sound-speed and refraction effects and are provided as a cleaned gridded Acoustic Backscatter IVS3D SD dataset. All soundings and ancillary raw and reduced data were provided with quality flags, indicating whether these data were rejected or deemed to be outside deliverable survey specifications. The National Oceanic and Atmospheric Administration (NOAA), on behalf of the United States Government, has a requirement to carry out mapping surveys of specific regions on the margins surrounding the Guam and Commonwealth of the Mariana Islands region of the western Pacific Ocean in order to determine the detailed bathymetry of the margins. The data are required to support any potential claim for extended jurisdiction by the United States under United Nations Convention on the Law of the Sea (UNCLOS) Article 76. The requirement is for the collection and processing of full-coverage multibeam sonar data in water depths of approximately 1000 to 11,000 m in order to precisely define the location of potential natural prolongations to the island arc as defined under UNCLOS Article 76. As part of their NOAA-funded research program, University of New Hampshire (UNH) researchers oversaw data acquisition, processing and archiving of the data collected during the cruise. md5_checksum value: 525108ff6e4354fcecf6e337e02ca81a *MarianaTrench_North_IVS3D_mos.sd digestIT 2004 was used to generate the md5_checksum value, please see http://www.openoffice.org/dev_docs/using_md5sums.html#lin for more information on how to validate the md5_checksum value. The cruise report for this cruise is located at: http://ccom.unh.edu/publications/Gardner_2010_cruise_report_SU10-1_Marianas.pdf. Information about UNH Center for Coastal and Ocean Mapping field activity are online at http://ccom.unh.edu/unclos/reports.htm. 2010-08-06 2010-09-05 Publication Date Complete None planned 146.249315 149.716315 21.306531 16.100531 None Acoustic Backscatter Extended Continental Shelf Project Glossary of Terms Foot of the slope none natural prolongation Uncontrolled - Departure Apra Harbor, Guam Uncontrolled - Arrival Apra Harbor, Guam NASA/GCMD Location Keywords Ocean > Pacific Ocean > Western Pacific Ocean > Micronesia > Northern Mariana Islands GEBCO GAZETTEER of Undersea Feature Names Mariana Trench SU10-1, SU10-2 USNS Sumner Kongsberg Maritime EM122 multibeam echosounder None The content on this website, including but not limited to the Grid Generations, are the Copyright of the University of New Hampshire - © 2010 The University of New Hampshire and its Center for Coastal and Ocean Mapping/Joint Hydrographic Center, Durham, NH 03824. Any redistribution or reproduction of part or all of the contents in any form is granted with the following restrictions: • You must attribute ownership of the copyrighted contents of this website to the rightful owner, the University of New Hampshire. The UNH Center for Coastal and Ocean Mapping operates in partnership with the National Oceanic and Atmospheric Administration. UNH/CCOM-JHC : Center for Coastal and Ocean Mapping/Joint Hydrographic Center, University of New Hampshire James V. Gardner Research Professor Mailing and Physical Address

Chase Ocean Engineering Lab, 24 Colovos Road

Durham NH 03824 USA (603) 862-3473 (603) 862-0834 jim.gardner@unh.edu 9:00 AM - 5:00 PM Eastern James V. Gardner, Andrew A. Armstrong - UNH/CCOM-JHC : Center for Coastal and Ocean Mapping/Joint Hydrographic Center, University of New Hampshire None Unclassified None All soundings are within 0.5% of water depth, based on cross-line checks. Positions were determined by corrected differential GPS-aided inertial navigation. Sound-speed profiles were calculated from numerous XBT casts calibrated to an CTD cast during a patch test performed immediately prior to data collection. Unknown Complete Horizontal positioning of the vessel was determined using Differential-aided DGPS integrated into a POS/MV model 320 version 4 system. Positioning is accurate to better than 0.5 meters (at 95% confidence) during all surveying. All positioning is referenced to the WGS84 Datum. +-0.5% of water depth. Individual soundings data were edited for fliers and then merged with navigation using University of New Brunswick Ocean Mapping Group SwathEd software. 2010-09-17 UNH/CCOM-JHC : Center for Coastal and Ocean Mapping/Joint Hydrographic Center, University of New Hampshire James V. Gardner Research Professor Mailing and Physical Address

Chase Ocean Engineering Lab, 24 Colovos Road

Durham NH 03824 USA (603) 862-3473 (603) 862-0834 jim.gardner@unh.edu 9:00 AM - 5:00 PM Eastern Raster SD Grid 5207 3468 0.000005 0.000005 Decimal Degrees WGS84 WGS84 6378137.00 298.257224 Backscatter Coordinate System 0.0 8-bit digital number (DN); DB = -(255-DN)/2 Explicit elevation coordinate included with horizontal coordinates Instantaneous sea level 0.5 percentage of water depth Explicit depth coordinate included with horizontal coordinates UNH/CCOM-JHC : Center for Coastal and Ocean Mapping/Joint Hydrographic Center, University of New Hampshire James V. Gardner Research Professor Mailing and Physical Address

Chase Ocean Engineering Lab, 24 Colovos Road

Durham NH 03824 USA (603) 862-3473 (603) 862-0834 jim.gardner@unh.edu 9:00 AM - 5:00 PM Eastern MarianaTrench_North_IVS3D_mos The University of New Hampshire through the Center for Coastal and Ocean Mapping/Joint Hydrographic Center (“UNH/CCOM-JHC”) makes this data and information available on its web site to enhance public knowledge and promote education. UNH/CCOM-JHC, however, cannot guarantee accuracy and reliability of this data. UNH/CCOM-JHC also retains the right to change any content on its website without prior notice. Neither UNH nor any agency thereof, nor any of their employees, contractors, or subcontractors, make any warranty, express or implied, nor assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any material, nor represent that its use would not infringe on privately owned rights. Information provided on this web site should not be used for navigational purposes. The materials on this web site are provided with the understanding that they are not guaranteed to be usable, timely, accurate, or complete. UNH/CCOM-JHC assumes no liability, any damages or loss of any kind that might arise from the use of, misuse of, or the inability to use this web site and/or the materials contained on the web site. UNH/CCOM-JHC assumes no liability for any damages or loss of any kind caused by any errors or omissions in the data contained on this web site. All materials that appear on the UNH/CCOM-JHC web site are distributed and transmitted “as is,” without warranties of any kind, either express or implied, and subject to the terms and conditions stated in this disclaimer. IVS3D SD Winzip (unzipped transfer size in MB) 36.4 http://ccom.unh.edu/unclos/data/*MarianaTrench_North_IVS3D_mos.sd go to http://ccom.unh.edu/unclos/data/*MarianaTrench_North_IVS3D_mos.sd None 2011-05-25 UNH/CCOM-JHC : Center for Coastal and Ocean Mapping/Joint Hydrographic Center, University of New Hampshire James V. Gardner Research Professor Mailing and Physical Address

Chase Ocean Engineering Lab, 24 Colovos Road

Durham NH 03824 USA (603) 862-3473 (603) 862-0834 jim.gardner@unh.edu 9:00 AM - 5:00 PM Eastern Content Standard for Digital Geospatial Metadata FGDC-STD-012-2002 Universal Time None Unclassified None