Identification_Information: Citation: Citation_Information: Originator: Pacific Islands Benthic Habitat Mapping Center (PIBHMC), Coral Reef Ecosystem Division (CRED), Pacific Islands Fisheries Science Center (PIFSC), National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA) Publication_Date: 20080730 Title: CRED Simrad em300 multibeam backscatter data from the islands and banks in the Mariana archipelago, 2007. Geospatial_Data_Presentation_Form: digital data Online_Linkage: http://www.soest.hawaii.edu/pibhmc/ Description: Abstract: Multibeam backscatter imagery extracted from gridded bathymetry of the Mariana archipelago between the U.S. Territory of Guam and Uracas Island in the Commonwealth of the Northern Mariana Islands. These data provide coverage between -100 and -3600 meters. The backscatter dataset includes data collected using the Simrad em300multibeam sonar. The sonars frequency is 30 kHz. These metadata are for the 5 m grid cell size Simrad em300 multibeam backscatter data only. Purpose: The GeoTIFFs and netCDF grids of backscatter imagery were created using data gathered from multibeam soundings for use as a planning and reference document. The data are also being used for benthic habitat mapping, for locating Essential Fish Habitat, and for studying geologic features of the area. Refer to supplemental information for description of instrument and survey. Supplemental_Information: Multibeam data were collected aboard the NOAA Ship Hi'ialakai, a 218' United States National Oceanographic and Atmospheric Administration research ship. The NOAA Ship Hi'ialakai's survey sensors include a 30 kHz Simrad EM300 sonar and a 300 kHz Simrad EM3002d sonar, which provide bathymetry and imagery data, a TSS/Applanix POS/MV Model 320, which measures position, velocity, attitude and heading, and a Seabird SBE 9/11 plus CTD used to measure sound velocity profiles. Specific equipment configurations are documented in metadata from cruises: HI0702, HI0703. These metadata can be accessed at: http://www.soest.hawaii.edu/pibhmc/cms/cruise-catalog/. 4792 rows, 4076 columns for portrait charts. 4076 rows, 4792 columns for landscape charts. Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 20070509 Ending_Date: 20070609 Currentness_Reference: ground condition Status: Progress: Complete Maintenance_and_Update_Frequency: As needed Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: 144.50 East_Bounding_Coordinate: 146.25 North_Bounding_Coordinate: 20.70 South_Bounding_Coordinate: 13.10 Keywords: Theme: Theme_Keyword_Thesaurus: NCEI Geoportal Filter Theme_Keyword: CoRIS_Metadata Theme: Theme_Keyword_Thesaurus: CRCP Project Theme_Keyword: Benthic Habitat Mapping and Characterization - Commonwealth of the Northern Mariana Islands and Guam Theme_Keyword: 1398 Theme: Theme_Keyword_Thesaurus: none Theme_Keyword: EARTH SCIENCE > Oceans > Bathymetry/Seafloor Topography > Backscatter Theme_Keyword: Acoustic Imagery Theme_Keyword: Multibeam Backscatter Theme_Keyword: Backscatter Theme: Theme_Keyword_Thesaurus: CoRIS Theme Thesaurus Theme_Keyword: EARTH SCIENCE > Oceans > Bathymetry/Seafloor Topography > Backscatter Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: oceans Theme_Keyword: 014 Theme_Keyword: elevation Theme_Keyword: 006 Theme: Theme_Keyword_Thesaurus: CoRIS Discovery Thesaurus Theme_Keyword: Geographic Information > Backscatter Place: Place_Keyword_Thesaurus: None Place_Keyword: UTM Zone 55 Place_Keyword: U.S. Territory of Guam Place_Keyword: Commonwealth of the Northern Mariana Islands Place_Keyword: United States of America Place: Place_Keyword_Thesaurus: CoRIS Place Thesaurus Place_Keyword: OCEAN BASIN > Pacific Ocean > Western Pacific Ocean > Mariana Archipelago > Northern Mariana Islands ( CNMI ) (18N146E0000) Place_Keyword: COUNTRY/TERRITORY > Northern Mariana Islands > Northern Mariana Islands > Northern Mariana Islands ( CNMI ) (18N146E0000) Place: Place_Keyword_Thesaurus: none Place_Keyword: OCEAN BASIN > Pacific Ocean > Central Pacific Ocean > Mariana Islands Place_Keyword: Hawaii > Honolulu Place: Place_Keyword_Thesaurus: CoRIS Region Place_Keyword: CNMI Access_Constraints: None Use_Constraints: These data are not to be used for navigation purposes. Please acknowledge NOAA and the Joint Institute for Marine and Atmospheric Research (JIMAR) University of Hawaii as the sources of this information. sources of this information. Point_of_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: Pacific Islands Benthic Habitat Mapping Center (PIBHMC), Coral Reef Ecosystem Division (CRED), Pacific Islands Fisheries Science Center (PIFSC), National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA) Contact_Person: Frances Lichowski Contact_Address: Address_Type: mailing and physical address Address: NOAA IRC Address: NMFS/PIFSC/CRED Address: 1845 WASP Blvd., Building 176 City: Honolulu State_or_Province: HI Postal_Code: 96818 Contact_Voice_Telephone: 808 725-5360 Contact_Facsimile_Telephone: 808 725-5429 Contact_Electronic_Mail_Address: nmfs.pic.credinfo@noaa.gov Contact_Instructions: e-mail preferred Browse_Graphic: Browse_Graphic_File_Name: http://www.soest.hawaii.edu/pibhmc/CNMI_images/guam_em300_boxes_440.jpg Browse_Graphic_File_Description: Multibeam Backscatter, Acoustic Imagery Browse_Graphic_File_Type: JPEG Browse_Graphic: Browse_Graphic_File_Name: http://www.soest.hawaii.edu/pibhmc/CNMI_images/saipan-tinian_em300_boxes_440.jpg Browse_Graphic_File_Description: Multibeam Backscatter, Acoustic Imagery Browse_Graphic_File_Type: JPEG Browse_Graphic: Browse_Graphic_File_Name: http://www.soest.hawaii.edu/pibhmc/CNMI_images/NMARC_bs_colors_575.jpg Browse_Graphic_File_Description: Multibeam Backscatter, Acoustic Imagery Browse_Graphic_File_Type: JPEG Data_Set_Credit: PIBHMC, CRED, PIFSC, NOAA and JIMAR Security_Information: Security_Classification_System: Not applicable Security_Classification: Unclassified Security_Handling_Description: Not applicable Native_Data_Set_Environment: GeoTIFF and netCDF grid file created using HMRG software in a LINUX environment Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: 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. Logical_Consistency_Report: These data are believed to be logically consistent though no tests were performed Completeness_Report: Complete Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: Horizontal positioning system: GPS (SPS) Horizontal position accuracy: 25 meters Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: 1 m Range resolution of sonar ~1.25 cm Raw sounding resolution: Variable Vertical accuracy of gridded product: 1% of water depth Lineage: Process_Step: Process_Description: Science Applications International Corporation's (SAIC) ISS-2000 acquires, processes and records data, provides survey control and underway quality control displays. SAIC's 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. Additional data acquisition and processing information can be found in the metadata for cruises HI0702 and HI0703. Hawaii Mapping Research Group (HMRG) processing software was then used to extract values of acoustic intensity from the soundings. HMRG is an organization of scientists, engineers and technicians whose mission is to design, build, and operate tools for mapping the seafloor. HMRG is a group within the School of Ocean and Earth Science and Technology at the University of Hawaii at Manoa. The gsf2bs program (July, 2005) converts the swath bathymetry ping records contained within a GSF (Generic Sensor Format) version 2.02 dataset into bs file format. This is done as follows: (i) position each beam's bottom detect intensity sample at the across-track location of that beam's bathymetry value; (ii) assuming a flat bottom in the near neighborhood of the beam, compute across-track distances for all of the beam's remaining intensity samples based on their temporal relation to the bottom detect sample and the computed average sound velocity for that beam as derived from its range and travel time; (iii) after all of the intensity samples from all beams of a ping have been located in across-track distance, fill the gaps between them as necessary by comparing travel times of beams adjacent to the gap, assigning the position using the adjacent sample closest to nadir, and averaging the interpolated values that fall within a cell. The conversion described above is necessary in order to run HMRG backscatter processing operations on the data, such as filtering to remove noise, and to create netCDF grids, raster images and GeoTIFF's. For more information on the backscatter processing technique see . Software_Used: SAIC ISS-2000 Acquisition Software, v 3.4 SAIC SABER Processing Software, v 4.1.16 Hawaii Mapping Research Group (HMRG) Processing Software GMT Generic Mapping Tools, v 4.2 MB System, v 5.1 Process_Date: 20080515 Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Raster Raster_Object_Information: Raster_Object_Type: Grid Cell Row_Count: 4076 Column_Count: 4792 Vertical_Count: 1 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: Universal Transverse Mercator Universal_Transverse_Mercator: UTM_Zone_Number: 55 Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.9996 Longitude_of_Central_Meridian: 147 Latitude_of_Projection_Origin: 0 False_Easting: 500000 False_Northing: 0 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: Row and Column Coordinate_Representation: Abscissa_Resolution: 5 Ordinate_Resolution: 5 Planar_Distance_Units: meters Geodetic_Model: Horizontal_Datum_Name: D_WGS_1984 Ellipsoid_Name: WGS_1984 Semi-major_Axis: 6378137.000000 Denominator_of_Flattening_Ratio: 298.257224 Vertical_Coordinate_System_Definition: Depth_System_Definition: Depth_Datum_Name: mean lower low water Depth_Resolution: 0.01 Depth_Distance_Units: meters Depth_Encoding_Method: Attribute Values Entity_and_Attribute_Information: Overview_Description: Entity_and_Attribute_Overview: Sidescan data within a GSF file are arranged as small sequences of intensity values, one sequence per beam per ping. The intensity values represent the amplitude of echo returns to the sensor and can be related to seabed roughness. Entity_and_Attribute_Detail_Citation: none Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: Pacific Islands Benthic Habitat Mapping Center (PIBHMC), Coral Reef Ecosystem Division (CRED), Pacific Islands Fisheries Science Center (PIFSC), National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA) Contact_Person: Frances Lichowski Contact_Address: Address_Type: mailing and physical address Address: NOAA IRC Address: NMFS/PIFSC/CRED Address: 1845 WASP Blvd., Building 176 City: Honolulu State_or_Province: HI Postal_Code: 96818 Contact_Voice_Telephone: 808 725-5360 Contact_Facsimile_Telephone: 808 725-5429 Contact_Electronic_Mail_Address: nmfs.pic.credinfo@noaa.gov Contact_Instructions: e-mail preferred Resource_Description: Downloadable Data Distribution_Liability: 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. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: GeoTIFF, .tif Format_Information_Content: TIFF is a format for storage, transfer, display, and printing of raster images. The TIFF file structure allows both the tag and the image data to be encoded into the same file. GeoTIFF refers to a TIFF file that has geographic data embedded as tags within the TIFF file. The geographic data can be used to position the image in the correct location and geometry on the screen of a geographic information display. Any GIS, CAD, Image Processing, Desktop Mapping and other types of systems using geographic images can read any GeoTiff file. More specifically, files of this type can be added to ArcInfo and ArcView 8.x or higher and may be viewed in the Table of Contents as a new raster layer. Image visualization software that does not use geography as a basis for image placement can view a GeoTIFF image as if there were no geographic information in the TIFF file. For example, GeoTIFF files can be viewed using Windows Picture and Fax viewer.The GeoTIFF format is public domain, non-proprietary. File_Decompression_Technique: none Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://www.soest.hawaii.edu/pibhmc/pibhmc_cnmi.htm Digital_Form: Digital_Transfer_Information: Format_Name: netCDF, .grd Format_Information_Content: 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). The file was created by the HMRG sofware program bsovl. More information about netCDF files can be found at at http://www.soest.hawaii.edu/gmt/ and http://www.unidata.ucar.edu/software/netcdf/. List of Simrad EM300 backscatter files and bounding coordinates: MARAMP-em300-25.4.00m.ss W/E/S/N 144.46/144.68/13.11/13.29 MARAMP-em300-25.5.00m.ss W/E/S/N 144.46/144.68/13.28/13.47 MARAMP-em300-25.6.00m.ss W/E/S/N 144.55/144.77/13.45/13.64 MARAMP-em300-25.7.00m.ss W/E/S/N 144.75/144.94/13.51/13.73 MARAMP-em300-25.8.00m.ss W/E/S/N 144.92/145.11/13.54/13.76 MARAMP-em300-25.9.00m.ss W/E/S/N 144.87/145.06/13.38/13.60 MARAMP-em300-25.10.00m.ss W/E/S/N 144.75/144.94/13.25/13.47 MARAMP-em300-25.11.00m.ss W/E/S/N 144.67/144.90/13.10/13.29 MARAMP-em300-25.43.00m.ss W/E/S/N 145.77/145.69/17.85/18.07 MARAMP-em300-25.44.00m.ss W/E/S/N 145.58/145.80/17.88/18.06 MARAMP-em300-25.45.00m.ss W/E/S/N 145.58/145.80/18.06/18.24 MARAMP-em300-25.46.00m.ss W/E/S/N 145.77/145.96/18.06/18.27 MARAMP-em300-25.47.00m.ss W/E/S/N 145.56/145.77/18.21/18.43 MARAMP-em300-25.48.00m.ss W/E/S/N 145.77/145.96/18.23/18.47 MARAMP-em300-25.18.00m.ss W/E/S/N 145.45/145.64/14.76/14.98 MARAMP-em300-25.19.00m.ss W/E/S/N 145.45/145.64/14.93/15.15 MARAMP-em300-25.20.00m.ss W/E/S/N 145.60/145.79/14.80/15.02 MARAMP-em300-25.21.00m.ss W/E/S/N 145.55/145.74/14.95/15.17 MARAMP-em300-25.22.00m.ss W/E/S/N 145.53/145.72/15.12/15.34 MARAMP-em300-25.23.00m.ss W/E/S/N 145.709/145.90/14.95/15.17 MARAMP-em300-25.24.00m.ss W/E/S/N 145.70/145.89/15.15/15.37 MARAMP-em300-25.25.00m.ss W/E/S/N 145.85/146.04/15.10/15.32 MARAMP-em300-25.26.00m.ss W/E/S/N 145.73/145.95/15.31/15.49 MARAMP-em300-25.27.00m.ss W/E/S/N 145.53/145.73/15.32/15.54 File_Decompression_Technique: none Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://www.soest.hawaii.edu/pibhmc Fees: None Metadata_Reference_Information: Metadata_Date: 20190605 Metadata_Review_Date: 20090413 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: Pacific Islands Benthic Habitat Mapping Center (PIBHMC), Coral Reef Ecosystem Division (CRED), Pacific Islands Fisheries Science Center (PIFSC), National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA) Contact_Person: Frances Lichowski Contact_Address: Address_Type: mailing and physical address Address: NOAA IRC Address: NMFS/PIFSC/CRED Address: 1845 WASP Blvd., Building 176 City: Honolulu State_or_Province: HI Postal_Code: 96818 Contact_Voice_Telephone: 808 725-5360 Contact_Facsimile_Telephone: 808 725-5429 Contact_Electronic_Mail_Address: nmfs.pic.credinfo@noaa.gov Contact_Instructions: e-mail preferred Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Time_Convention: Universal Time Metadata_Access_Constraints: None Metadata_Use_Constraints: None CoRIS: CoRIS_ID: 20090409110831 CoRIS_Children: None CoRIS_Beginning_Date: 20070509 CoRIS_Ending_Date: 20070609 CoRIS_Metadata_Link: https://www.coris.noaa.gov/metadata/records/html/cred_backscatter_mariana_em300.html CoRIS_Tracking_ID: 4021