Gridded multibeam bathymetry of Guam Island, Guam U.S. Territory

Gridded bathymetry at 60m resolution surrounding Guam Island, Guam U.S. Territory. Bottom coverage was achieved in depths between 0 and ~3500 meters. The Arc ASCII grids and floating point geotifs include multibeam bathymetry data acquired over multiple surveys by the NOAA Pacific Islands Fisheries Science Center, Ecosystem Sciences Division (as of May 2017). The data were acquired using the Simrad EM300, and Reson 8101 multibeam sonars, with sonar frequencies of 30 and 240 kHz respectively. The 60m grid is mosaiced from data sets acquired in 2003, 2007, 2010 and 2017.

These ASCII and floating point grids 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 (as defined by NOAA Fisheries), and for studying geologic features of the area. Refer to supplemental information for description of instrument and survey.

Multibeam data were collected aboard the NOAA Ship Hi'ialakai, a 218' NOAA 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.

Multibeam data were also collected 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 R/V AHI's 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.

Additional data were collected aboard the NOAA vessel Oscar Elton Sette, a 68 m (224') NOAA research ship. The Oscar Elton Sette deployed an over-the-side pole mounted survey sensors system including a 240 kHz RESON 8101-ER sonar which measures bathymetry and acoustic backscatter imagery, a TSS/Applanix POS/MV Model 320 which measures time, position, velocity, attitude and heading, and a Seabird SBE 19 CTD used to measure sound velocity profiles.

Specific equipment configurations are documented in metadata from cruises AHI-03-07, AHI-07-02, HI-07-02, SE-10-02, and HA-17-01. These metadata can be accessed at: https://www.soest.hawaii.edu/pibhmc/cms/cruise-catalog/.

Depth values are real values based on the average of the soundings that fell within the extracted grid cells. The 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 these data have not been developed. Therefore, the accuracy of depth measurements should be considered to be within 1 meter.

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While every effort has been made to ensure that these data are accurate and reliable within the limits of the current state of the art, NOAA cannot assume liability for any damages caused by errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty.

Extent of area mapped around the island of Guam between ~0 and ~3500 m.

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NOAA Coral Reef Ecosystem Program (CREP) Data Sharing Recommendations, version 9.0 updated August 12, 2015:

CREP welcomes the opportunity to collaborate on research issues contributing to the scientific basis for better management of marine ecosystems. CREP has a very diverse set of field activities that generates large volumes of data using an array of data collection protocols.

The following recommendations are for your consideration as you use this data:

1) Data analyses should take all field exigencies into account. The most effective way to do this would be active collaboration with CREP principal investigators.

2) In all presentations, product releases, or publications using data generated by CREP, proper acknowledgement of both CREP and the individuals responsible for data collection is expected. Citing the DOI (if available) is preferred, a non-DOI example is listed below.

3) If you collect or generate data for the same study areas, CREP requests that you share relevant information on complimentary data collections.

4) Those receiving data are strongly urged to inform the CREP Data Management Team of any errors and discrepancies that are discovered during the course of using these data. They are further urged to bring to the attention of the Team all problems and difficulties encountered in using these data. This information is necessary in order to improve the collections and to facilitate more efficient and economical data processing and retrieval. The users are asked to supply copies of any missing data that may be located, and to provide information as to significant subsets and special aggregations of data that are developed in using the material provided.

Example citation:

"This publication makes use of data products provided by the Ecosystem Sciences Division, Pacific Islands Fisheries Science Center (PIFSC), National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA), with funding support from the NOAA Coral Reef Conservation Program (CRCP) and the Pacific Islands Deep Sea Coral and Sponge Initiative. The analysis and interpretations presented here are solely that of the current authors.”

Data can be accessed online via the Pacific Islands Benthic Habitat Mapping Center website at https://www.soest.hawaii.edu/pibhmc/cms/data-by-location/cnmi-guam/guam-island/bathymetry/

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These data are not to be used for navigation purposes.

Please cite NOAA Ecosystem Sciences Division (ESD) when using the data.

Suggested citation:

Ecosystem Sciences Division; Pacific Islands Fisheries Science Center (2017). Gridded multibeam bathymetry of Guam Island, Guam U.S. Territory. https://www.fisheries.noaa.gov/inport/item/47577

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ArcGIS ASCII and Floating Pt. geotif files both created using a number of processes in QPS Fledermaus and Quimera, as well as ESRI ArcGIS; Windows operating system.

Relevant offset, sound velocity, and tidal corrections are applied to the data as part of the processing procedures.

Data collected in 2017 were only used to gap fill the existing 60m bathymetry grid from data previously collected (2003-2010).

These data are believed to be logically consistent though no tests were performed

New data collected in 2017 were evaluated against pre-existing data before the data were deemed usable and appended to the pre-existing grids.

Source data are archived and available through NOAA. Gridded multibeam bathymetry data products are accessible via the Pacific Islands Benthic Habitat Mapping Center website.

University of Hawaii School of Ocean and Earth Science and Technology, NOAA IRC and NOAA Fisheries ITS resources and assets.

Process to produce bathymetry grid from source multibeam bathymetry data.