EM300 Multibeam Sonar Data collected from January 26 to April 22 from NOAA Ship Hi'ialakai cruise HA-15-01 to the Pacific Remote Island Areas and American Samoa in 2015

Multibeam data were collected using a Simrad EM300 30-kHz sonar aboard NOAA Ship Hi'ialakai, a 68-m (218') NOAA research vessel, from January 26 to April 22, 2015 during cruise HA-15-01. Multibeam data were acquired at Johnston, Howland, Baker, Jarvis, and Palmyra in the Pacific Remote Island Areas, and Swains and Tutuila in American Samoa. The multibeam data were collected using Kongsberg SIS software in the *.all format and processed using SABER and QPS Qimera editing software. Surface sound velocity values were supplied by Seabird SBE-45 MicroTSG and a SBE-38, and motion corrections from a TSS/Applanix POS MV (Model 320 Version 4) vertical reference were applied to the data in real time. WGS84 datum. The vessel is equipped with a sound velocity profiler; however, no casts were acquired during mapping operations. Attempts were made to improve vertical fit of the EM300 data by using sound velocity profile data from other sources (data from previous cruises, and synthetic data derived from World Ocean Atlas using velocipy); however, these alternatives were not effective. Resulting vertical discrepancies with pre-existing surfaces are ±10m; however, the EM300 data cover deep depths (up to 4800m) and therefore these errors were considered acceptable. The EM300 data only covered new terrain around Howland and Baker islands, and therefore only the data for these areas have been processed. Depths mapped range from ~50 m to 4800 m. These data are not to be used for navigation.

The Pacific Islands Deep-Sea Coral and Sponge Initiative (PICSI) aimed to map and characterize deep-sea coral and sponge ecosystems of the Pacific Marine National Monuments in select areas of the U.S. Pacific Islands through systematic field surveys that utilize bathymetry and other seascape features to prioritize survey locations. Data collected by the NOAA Ecosystem Sciences Division (ESD) in 2015 was intended to gap-fill pre-existing bathymetry coverage around the U.S. Pacific Islands visited during ESD's Pacific Reef Assessment and Monitoring Program cruise to the Pacific Remote Island Areas and American Samoa.

The Hi'ialakai's survey sensors include a 30 kHz Simrad EM300 sonar and a 300 kHz Simrad EM3002d sonar, which measure bathymetry and acoustic backscatter imagery. However, as a result of concerns associated with the EM3002d sonar and deviations from data acquisition protocols (e.g., no sound velocity profiles), and considering the newly acquired data only covered areas previously surveyed, the data acquired with the EM3002d sonar will not be archived.

EM300 Multibeam Sonar Data from NOAA Ship Hi'ialakai Cruise HA-15-01 in *.all (raw) and *.GSF (processed) file formats. All raw data collected during the cruise are included in the archive, only data for Howland and Baker islands have been processed and developed into raster products (*.TIF). Depth values are in meters.

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.

Johnston, Howland, Baker, Jarvis and Palmyra of the Pacific Remote Islands Marine National Monument, and Tutuila and Swains in American Samoa.

Not applicable

Not applicable

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 NOAA National Centers for Environmental Information (NCEI) Bathymetry Archive.

none

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

Suggested citation:

Ecosystem Sciences Division; Pacific Islands Fisheries Science Center (2018). EM300 Multibeam Sonar Data collected from January 26 to April 22 from NOAA Ship Hi'ialakai cruise HA-15-01 to the Pacific Remote Island Areas and American Samoa in 2015. NOAA's National Center for Environmental Information, https://www.fisheries.noaa.gov/inport/item/47822.

None

None

Bathymetry data acquired using Kongsberg SIS (*all format). Post-processing conducted in SABER and QPS Qimera. Where data are of sufficient coverage and quality (Howland and Baker islands), data archived as processed *gsf.

The Hi'ialakai's equipment serial numbers, software versions and sensor configuration settings are as follows:

~~~~~~~~~~

SIMRAD EM300 multibeam echosounder

Serial #: 303

PU Software Versions:

PU: 2.0.0 040330

DDS: ***

BSP: 2.3.1 040131

SPRX: 1.1.3 040427

SPTX: 1.1.4 001016

SIS Software Version: 3.2.2, build 54, Sept 7 2006

~~~~~~~~~~

SIMRAD EM3002D multibeam echosounders

Serial #: 357 and 353

PU Software Versions:

HCT: 2.0.7 040906

BSP67 Master: 1.3.1 060113

BSP67 Slave: 1.3.1 060113

PU: 1.8.7 060831

DDS: 3.18 2005/11/24

SIS Software Version: 3.2.2, build 54, Sept 7 2006

~~~~~~~~~~

HI'IALAKAI POS/MV Model 320, version 4.000000

PCS serial #: 2484.000000

IMU serial #: 1333

PCS Firmware: 2.900000

Controller software: v 3.410000

~~~~~~~~~~

Seabird SBE 9/11 plus CTD:

Serial #: 09P35130-0737

~~~~~~~~~~

Hi'ialakai Lever Arm Distances and Alignment Offsets:

The Hi'ialakai's Reference Point (RP) is a granite block situated 1.222 m starboard of the ship's centerline, 1.23 m above the ship's baseline/datum on the keel. The RP is located under the forward deck, in the ship's laundry room. The ship's sensors, the sonar systems and permanent benchmarks are measured with respect to the RP. 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 survey waterline is defined to be at the 15' draft mark on the vessel's starboard side.

~~~~~~~~~~

POS/MV Settings:

RP to IMU, m X= 0.434 Y= 0.0 Z= -0.117

RP to Primary POS Antenna X= -1.532 Y= -2.874 Z= -22.267

POS GAMS Baseline X= -0.11 Y= 3.096 Z= -0.001

~~~~~~~~~~

EM300 Settings: X Y Z

Pos sensors 1 2 & 3, m 0 0 0

TX Transducer, m -4.09 -2.22 1.73

RX Transducer, m -6.07 -1.22 1.73

Attitude sensors 1 & 2, m 0 0 0

Waterline, m -3.25

-----Roll Pitch Heading

TX Transducer, deg 0.00 0.00 0.00

RX Transducer, deg 0.00 0.00 0.00

Attitude 1, deg -0.11 0.00 0.00

Attitude 2, deg 0 0 0

Stand-alone heading, deg 0

~~~~~~~~~~

EM3002D Settings:

Pos sensors 1 2 & 3, m 0 0 0

Sonar head 1 (port), m 4.44 -1.48 1.56

Sonar head 2 (stbd), m 4.44 -0.96 1.56

Attitude sensors 1 & 2, m 0 0 0

Waterline, m -3.26

Depth sensor, m 0 0 0

-----Roll Pitch Heading

Sonar head 1 (port), deg 39.83 0.97 0.43

Sonar head 2 (stbd), deg -39.62 1.13 358.56

Attitude 1, deg 0.00 0.00 0.00

Attitude 2, deg 0 0 0

Stand-alone heading, deg 0

~~~~~~~~~~

Resource Description: EM300 and EM3002D Multibeam Sonar Data from Cruise Hi'ialakai HA-15-01

Horizontal_Positional_Accuracy_Value: 20 (no DGPS corrections applied)

Vertical_Positional_Accuracy_Value: Vertical accuracy is depth dependent (~0.5% of water depth).

As a result of concerns associated with the EM3002d sonar and deviations from data acquisition protocols (e.g., no sound velocity profiles), and considering the newly acquired data only covered areas previously surveyed, the data acquired with the EM3002d have not been archived. All raw EM300 data were archived; however, EM300 data only covered new terrain around Howland and Baker islands, and therefore only the data for these areas have been processed and incorporated into map products.

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

- Surface sound velocity values were supplied by Seabird SBE-45 MicroTSG and a SBE-38, and motion corrections from a TSS/Applanix POS MV (Model 320 Version 4) vertical reference were applied to the data in real time.

- Spurious data points were removed (automated and manual)

- Comparisons with previously acquired, overlapping data

NOAA IRC and NOAA Fisheries ITS resources and assets.

Multibeam data processing procedures.