Mosaic of gridded multibeam and lidar bathymetry of the US Territory of Guam

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: 20110304
Title:

Mosaic of gridded multibeam and lidar bathymetry of the US Territory of Guam

Online_Linkage: http://www.soest.hawaii.edu/pibhmc
Online_Linkage:

https://www.soest.hawaii.edu/pibhmc/cms/data-by-location/cnmi-guam/guam-island/bathymetry/

Description:

Abstract:

Gridded multibeam bathymetry is integrated with gridded lidar bathymetry. Gridded (5 m cell size) multibeam bathymetry were collected aboard NOAA Ship Hiialaka'i and R/V AHI and by the Naval Oceanographic Office and NOAA Office of Coast Survey in Apra Harbor. Lidar bathymetry were collected by the Naval Oceanographic Office and by the Joint Airborne Lidar Bathymetry Technical Center of Expertise. This dataset is for the shelf environment of the US Territory of Guam Island

Purpose:

The data were derived in support of NOAA Coral Reef Conservation Program goals. Goal 1 is to map all U.S. Coral Reef Ecosystems. This data set specifically addresses Objective 1 and 4: to develop high-resolution benthic maps and to characterize priority deep water reefs and associated habitats. This integration of derived bathymetry with multibeam sonar data provides a GIS layer with expanded spatial coverage that may be used for benthic and essential fish habitat characterization, and for the study of geologic features. By combining the dataset with other bathymetry, backscatter, derivatives, and in situ data, they collectively compose benthic habitat maps designed to be used to understand and predict shallow depth (0m to 150m) benthic habitats for organisms that inhabit coral reef ecosystems.

Supplemental_Information:

Gridded multibeam data were collected by CRED in 2003 and 20007 aboard the Hi'ialakai, a 218' United States National Oceanographic and Atmospheric Administration (NOAA) research ship, and aboard the R/V AHI (Acoustic Habitat Investigator), a 25' survey launch owned and operated by the NOAA Pacific Islands Fisheries Science Center in Honolulu, HI. The metadata for these bathymetry is documented in the product metadata, guam_5m.txt on ftp://ftp.soest.hawaii.edu/pibhmc/website/data/cnmi-guam/bathymetry Multibeam data were also collected by the Naval Oceanographic Office and NOAA Office of Coast Survey in 2008, in Apra Harbor. These data are also presented in a 1-m resolution grid online, and metadata for these data are documented in the product metadata apra_bty_1m.txt on http://www.soest.hawaii.edu/pibhmc/pibhmc_cnmi_apra_bathy.htm. Lidar data were provided by the Naval Oceanographic Office, and were obtained using a SHOALS airborne system during January-March 2001. Additional lidar data were collected by the Joint Airborne Lidar Bathymetry Technical Center of Expertise (JALBTCX). These data were collected using the CHARTS system between February 18 and May 20 2007. These data are available on NGDC and more detailed metadata for these data can be found on https://coast.noaa.gov/digitalcoast//data/index.html

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20010301
Ending_Date: 20080504

Currentness_Reference: ground condition

Status:

Progress: Complete
Maintenance_and_Update_Frequency: As needed

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: 144.608
East_Bounding_Coordinate: 145.009
North_Bounding_Coordinate: 13.727
South_Bounding_Coordinate: 13.220

Keywords:

Theme:

Theme_Keyword_Thesaurus: NCEI Geoportal Filter
Theme_Keyword: CoRIS_Metadata

Theme:

Theme_Keyword_Thesaurus: CRCP Project
Theme_Keyword:

M218 Benthic Habitat Mapping and Characterization in the Pacific Islands Region

Theme_Keyword: 1217

Theme:

Theme_Keyword_Thesaurus: CoRIS Theme Thesaurus
Theme_Keyword:

EARTH SCIENCE > Oceans > Bathymetry/Seafloor Topography > Bathymetry

Theme_Keyword:

EARTH SCIENCE > Oceans > Bathymetry/Seafloor Topography > Water Depth

Theme:

Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: elevation
Theme_Keyword: 006

Theme:

Theme_Keyword_Thesaurus: CoRIS Discovery Thesaurus
Theme_Keyword: Geographic Information > Bathymetry

Place:

Place_Keyword_Thesaurus: CoRIS Place Thesaurus
Place_Keyword:

OCEAN BASIN > Pacific Ocean > Western Pacific Ocean > Guam > Guam (13N144E0000)

Place_Keyword:

COUNTRY/TERRITORY > United States of America > Guam > Guam (13N144E0000)

Place:

Place_Keyword_Thesaurus: CoRIS Region
Place_Keyword: Guam

Access_Constraints: None
Use_Constraints:

These data are not to be used for navigation purposes. Please acknowledge NOAA Pacific Islands Fisheries Science Center (PIFSC) Coral Reef Ecosystem Division (CRED), the Joint Institute for Marine and Atmospheric Research (JIMAR) University of Hawaii, the NOAA Office of Coast Survey (NOAA OCS), the Naval Oceanographic Office (NAVO), and the Joint Airborne Lidar Bathymetry Technical Center of Expertise (JALBTCX).

Browse_Graphic:

Browse_Graphic_File_Name:

https://www.soest.hawaii.edu/pibhmc/CNMI_images/Guam_5m_bathymetry_mb&lidar_445.jpg

Browse_Graphic_File_Description: Gridded Bathymetry
Browse_Graphic_File_Type: JPG

Data_Set_Credit: NOAA PIFSC CRED, PIBHMC, NOAA OCS, NAVO, JALBTCX
Security_Information:

Security_Classification_System: Not applicable
Security_Classification: Unclassified
Security_Handling_Description: Not applicable

Native_Data_Set_Environment: ArcGIS ASCII file created in ESRI ArcMap

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 C/A Horizontal position accuracy: 25 meters

Vertical_Positional_Accuracy:

Vertical_Positional_Accuracy_Report:

Range resolution of sonar: varies with depth Raw sounding resolution: varies with depth Vertical accuracy of gridded sonar product: ~ 1% of water depth Vertical accuracy of derived bathymetry product: 5 meter range

Lineage:

Process_Step:

Process_Description:

metadata apra_bty_1m.txt) on ftp://ftp.soest.hawaii.edu/pibhmc/website/data/cnmi-guam/bathymetry and http://www.soest.hawaii.edu/pibhmc/pibhmc_cnmi_apra_bathy.htm respectively. Lidar xyz data from the two sources (2001 data from Naval Oceanographic Office and 2007 data from the Joint Airborne Lidar Bathymetry Technical Center of Expertise) were gridded using nearneighbor, a Generic Mapping Tools (GMT) algorithm. GMT is an open source collection of tools for manipulating geographic data sets. Additional information about GMT can be found at: http://www.soest.hawaii.edu/gmt and additional information about the multibeam data processing is recorded in the cruise metadata. This results in a netCDF grid file format, which is then converted to an ArcGIS ASCII file format using LINUX/UNIX commands in combination with GMT. ArcGIS ASCII files can then be converted into raster format using ArcToolbox (Conversion Tools > To Raster > ASCII to Raster). For both lidar data sets, positive values (i.e. those on land), were removed, leaving only depth values. The four bathymetry grids were combined in ESRI ArcMap using the Mosaic Tool (ArcToolbox > Data Management Tools > Raster > Raster Dataset > Mosaic). The Mosaic Method used was "First" which allows the user to prioritize which values are used for overlapping pixels. The four bathymetry data sets were prioritized in the following order, based on the perceived accuracy of the four data sets: Apra Harbor multibeam, CRED multibeam, JALBTCX lidar, NAVO lidar. This resulted in the final combined bathymetry grid (gua_mb_ld.asc).

Process_Date: 20110301

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Raster
Raster_Object_Information:

Raster_Object_Type: Grid Cell
Row_Count: 11155
Column_Count: 8574
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: 0.999600
Longitude_of_Central_Meridian: 147.000000
Latitude_of_Projection_Origin: 0.000000
False_Easting: 500000.000000
False_Northing: 0.000000

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method: Row and Column
Coordinate_Representation:

Abscissa_Resolution: 5.000000
Ordinate_Resolution: 5.000000

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

Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization:

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: Arc ASCII
Format_Information_Content:

Arc ASCII can be converted to Arc Raster using ArcToolbox Conversion tools (ASCII to Raster).

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name:

ftp://ftp.soest.hawaii.edu/pibhmc/website/data/cnmi-guam/bathymetry/Guam_5m_Bathymetry_mb&lidar.zip

Fees: None

Mosaic of gridded multibeam and lidar bathymetry of the US Territory of Guam

Metadata: