Benthic Habitat Mapping Group, CRED, PIFSC, NOAA 20040506 raster digital data ftp://ftp.soest.hawaii.edu/pibhmc/data/amsamoa/chehalis-1.asc.zip ftp://ftp.soest.hawaii.edu/pibhmc/data/amsamoa/chehalis-1.grd.zip Gridded bathymetry of the wreck of the USS Chehalis in Pago Pago Harbor, American Samoa. This data was collected to highlight details of the ship wreck. This grid was created using data gathered from multibeam soundings for use as a planning and reference document. Refer to supplemental information for description of instrument and survey. Data were collected aboard the R/V AHI (Acoustic Habitat Investigator), a 25ó survey launch owned and operated by the NOAA Pacific Islands Fisheries Science Center in Honolulu, HI. The R/V AHIós survey sensors include a 240 kHz RESON 8101-ER sonar providing bathymetry and imagery data, a TSS/Applanix POS/MV Model 320 which measures position, velocity, attitude and heading, and a Seabird SBE 19 CTD used to measure sound velocity profiles. Equipment serial numbers and software versions are as follows: RESON 8101-ER multibeam echosounder DOC inventory #: CD0000537418 Firmware, dry: 8101-2.07-2D4D Firmware, wet: 8101-1.06-2F6B POS/MV Model 320, version 3 DOC inventory #: CD0000476647 PCS serial #: 474 IMU serial #: 203 Controller software: v 1.0.5.0 Seabird SBE19 CTD: Serial #: 3029 R/V AHI Lever Arm Distances and Alignment Offsets The R/V AHI Reference Point (RP) is defined to be the intersection of the vessel's centerline, the cabin deck and the bulkhead immediately aft of the transducer. This is marked by a punch in the deck weld at that location. Positive X means the point is forward of the RP, positive Y means the point is to starboard of the RP, positive Z means the point is below the RP. The loaded waterline is defined as the intersection of the vesselós performance wing with the hull at the transom. Antenna Baseline Distance, m: 1.229 Transducer depth below waterline, m 0.62 RP to IMU 0.80 0.00 0.08 RP to Primary GPS Antenna -3.55 -0.61 -1.88 RP to Vessel 0.16 0.00 0.77 RP to Sensor 1(MB transducer) 0.16 0.00 0.77 RP to Sensor 2 0 0 0 RP to Aux. GPS Antenna 0 0 0 RP to Heave lever arm(deg) -0.67 0.00 0.00 IMU rotation Ref. Frame, deg 0 0 0 Sensor 1 rotation Ref. Frame, deg 0 0 0 Sensor 2 rotation Ref. Frame, deg 0 0 0 Roll offset: +0.5 deg Pitch offset: 0.0 deg Gyro offset: 0.0 deg 20040303 20040303 ground condition Complete As needed -170.684338 -170.679597 -14.273471 -14.27628 CoRIS Theme Thesaurus EARTH SCIENCE > Oceans > Bathymetry/Seafloor Topography > Bathymetry CoRIS Discovery Thesaurus Numeric Data Sets > Bathymetry None Gridded bathymetry ISO 19115 Topic Category elevation 006 CoRIS Place Thesaurus OCEAN BASIN > Pacific Ocean > Tutuila Island > Pago Pago (14S170W0008) COUNTRY/TERRITORY > United States of America > American Samoa > Tutuila Island > Pago Pago (14S170W0008) None Pago Pago Harbor Tutuila American Samoa None These data are not to be used for navigation purposes. Please acknowledge the NOAA Coral Reef Ecosystem Division, Pacific Islands Fisheries Science Center as the source of this information. Benthic Habitat Mapping Group, Coral Reef Ecosystem Division, PIFSC,NOAA Joyce Miller mailing and physical address

1125B Ala Moana Blvd

Honolulu HI 96814 USA 808-592-8303 joyce.miller@noaa.gov http://www.pifsc.noaa.gov/cred/hmapping/img/original/06k-chehalis-1.jpg Gridded Bathymetry jpeg Benthic Habitat Mapping Group, Coral Reef Ecosystem Division (CRED), Pacific Islands Fisheries Science Center (PIFSC), NOAA Data are collected for resource management and research purposes and are tested for internal consistency; however, no effort is made to compare these data to external references or to other published data. Unspecified Complete Horizontal positioning system: GPS SPS Horizontal position accuracy: 5 Range resolution of sonar ~ 1.25 cm Raw sounding resolution: 1 cm Vertical accuracy of gridded product ~ 1 meter Science Applications International Corporationós (SAIC) ISS-2000 acquires, processes and records data, provides survey control and underway quality control displays. SAICós SABER processing software is used to process the raw soundings, analyze the results, manually edit the sounding data to remove outliers and derive average gridded data values. GMT was then used to reformat the grid into final form. Interactive Visualization Systemós Fledermaus and ESRI ArcGIS were used for viewing results and creating browse objects. The data have been corrected for predicted tides based on the NOAA NOS tide station in Pago Pago harbor. Software used: SAIC ISS-2000 Acquisition Software, v 3.4.4 (20040114) SAIC SABER Processing Software, v 3.0 (20031218) GMT Generic Mapping Tools, v 3.4.2 (20021002) 20040506 Raster Grid Cell 310 511 1 Universal Transverse Mercator -2 0.9996 -171 0 500000 10000000 Row and Column 1 1 meters D_WGS_1984 WGS_1984 6378137.000000 298.257224 mean lower low water 0.01 meters Attribute Values Depth values are real values based on the average of the soundings that fell within the extracted grid cells. Number of soundings per grid cell range from >1000 soundings in shallow depths to as few as 20 soundings in deeper areas. A total error budget for this survey has not been developed, therefore the accuracy of depth measurements should be considered to be within 1 meter. none Benthic Habitat Mapping Group, CRED, PIFSC, NOAA Joyce E. Miller Oceanographer mailing and physical address

1125 'B' Ala Moana Blvd

Honolulu Hawaii 96814 USA 808-592-8303 joyce.miller@noaa.gov Downloadable Data These data are not to be used for navigational purposes. NOAA makes no warranty regarding these data, expressed or implied, nor does the fact of distribution constitute such a warranty. NOAA cannot assume liability for any damages caused by any errors or omissions in these data, nor as a result of the failure of these data to function on a particular system. netCDF Binary netCDF Grid: This file is formatted as a 2-D binary netCDF grid file. This is the default grid file format used by GMT (Generic Mapping Tools), which created this file. More information can be be located at http://gmt.soest.hawaii.edu and http://unidata.ucar.edu/packages/netcdf/index.html Zip file 0.4 ftp://ftp.soest.hawaii.edu/pibhmc/data/amsamoa/chehalis-1.grd.zip ASCII ARC/INFO Grid ASCII ARC/INFO grid Files of this type can be imported with ArcToolbox 8.3 using the following path: Conversion Tools;Import to Raster;ASCII to Grid (Float). These data as having the following header format and description NCOLS xxx NROWS xxx XLLCORNER xxx YLLCORNER xxx CELLSIZE xxx NODATA_VALUE xxx ROW 1 ROW 2 . . . ROW n where: NCOLS is the number of columns in the ASCII file. NROWS is the number of rows in the ASCII file. XLLCORNER is the x coordinate for lower left corner of the lower left most cell in the grid. YLLCORNER is the x coordinate for the lower left corner of the lower left most cell in the grid. CELLSIZE is the length of a cellós edge. NODATA_VALUE is the value in the ASCII file representing unknown values. xxx are numbers, and the cell values are space delimited Zip file 0.4 ftp://ftp.soest.hawaii.edu/pibhmc/data/amsamoa/chehalis-1.asc.zip None 20080812 Benthic Habitat Mapping Group, CRED, PIFSC, NOAA Dr. Michael Parke Research Biologist mailing and physical address

1125 'B' Ala Moana Blvd

Honolulu Hawaii 96814 USA 808-592-7025 michael.parke@noaa.gov FGDC Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998 Local Time None None 20041213072729 None 20040303 20040303 http://www.coris.noaa.gov/metadata/records/txt/cred_gridded_bathy_pago_pago_harbor_2004.txt 794