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)
20070301
CRED 20m Gridded bathymetry of Necker Island, Hawaii, USA (Arc ASCII format)
digital data
http://www.soest.hawaii.edu/pibhmc/cms/data-by-location/northwest-hawaiian-islands/
Gridded bathymetry of the shelf and slope environments of
Necker Island, Northwestern Hawaiian Islands, Hawaii, USA. This ASCII
includes multibeam bathymetry from the Simrad EM1002 and Simrad EM120 multibeam
sonars collected as of October 2006 by the NOAA Coral Reef Ecosystem Division
in depths between 20 and 1500 meters. The ASCII grid also includes estimated
depths derived from high resolution IKONOS satellite imagery by the
NOAA/NOS/NCCOS/CCMA Remote Sensing Team in shallow water between 0 and 16 meters.
The ASCII was created using data gathered from multibeam soundings and IKONOS
estimated depths 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.
Data were collected aboard the R/V Kilo Moana, a 186' United States Navy owned
research vessel. The R/V Kilo Moana's survey sensors include a 12 kHz Simrad EM120
sonar and a 95 kHz Simrad EM1002 sonar, which provide bathymetry and imagery data,
a TSS/Applanix POS/MV Model 320, which measures position, velocity, attitude and
heading, and a Sippican MK-21/PC based XBT system plus a Seabird SBE 9/11 CTD both
of which measured sound velocity profiles.
IKONOS estimated depths were produced using rule-based, semi-automated image analysis
of high-resolution satellite imagery for nine locations in the Northwestern Hawaiian
Islands. For more information about the estimated depth data see the following online
link: http://mercury.ornl.gov/metadata/nbii/html/nos/est%5Fdepth%5Fnwhi.html
Specific equipment configurations are documented in metadata from IKONOS Estimated
Depths and cruises KM0206. These metadata can be accessed at:
http://www.soest.hawaii.edu/pibhmc/cms/cruise-catalog/
2000
20021115
ground condition
As needed
-165.083508
-164.070204
23.919511
23.114007
NCEI Geoportal FilterCoRIS_Metadata
CRCP Project
Benthic Habitat Mapping and Characterization - Northwestern and Main Hawaiian Islands
1217
CoRIS Discovery Thesaurus
Geographic Information > Bathymetry
ISO 19115 Topic Category
elevation
006
CoRIS Theme Thesaurus
EARTH SCIENCE > Oceans > Bathymetry/Seafloor Topography > Bathymetry
None
Bathymetry
Multibeam sonar
satellite imagery
estimated depth
None
Necker Island
Hawaii
Northwestern Hawaiian Islands
United States of America
CoRIS Place Thesaurus
OCEAN BASIN > Pacific Ocean > Central Pacific Ocean > Northwestern Hawaiian Islands > Necker Island (23N164W0001)
COUNTRY/TERRITORY > United States of America > Hawaii > Honolulu > Necker Island (23N164W0001)
CoRIS Region
NWHI
None
These data are not to be used for navigation purposes.
Please acknowledge NOAA and the Joint Institute for Marine and Atmospheric
Research, University of Hawaii as the sources of this information.
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)
mailing and physical address
NOAA IRC
NMFS/PIFSC/CRED
1845 WASP Blvd., Building 176
Honolulu
HI
96818
808 725-5360
808 725-5429
nmfs.pic.credinfo@noaa.gov
e-mail preferred
http://www.soest.hawaii.edu/pibhmc/NWHI_images/Necker_20m_500.jpg
Multibeam Bathymetry
JPEG
PIBHMC, CRED, PIFSC, NOAA and JIMAR
Not applicable
Unclassified
Not applicable
Native_Data_Set_Environment: ArcGIS ASCII file created in a LINUX environment
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.
These data are believed to be logically consistent
though no tests were performed
Complete
Horizontal positioning system: GPS (SPS)
Horizontal position accuracy: 25 m
1 m
Raw sounding resolution: Variable
Multibeam swath files are acquired in the Generic Sensor Format (GSF) and
are edited on a swath by swath basis using SAIC's SABER editing software.
The edited swath files are then combined into a Pure File Magic (PFM) format
in SABER and area based editing is performed. The edited PFM is then exported
as X,Y,Z points with a defined grid cell size and the points are combined
with X,Y,Z IKONOS estimated depth points. The resulting X,Y,Z data are then
gridded using xyz2grd, a Generic Mapping Tools (GMT) algorithm that converts
an ASCII or binary table to a netCDF grid file format. GMT is an open source
collection of tools for manipulating geographic data sets. Grid nodes with more
than one value are set to the average value and unconstrained nodes are set to
NaN. Finally, the netCDF grid is clipped at a depth that minimizes data gaps
for the specified grid cell size and then converted to an ArcGIS ASCII file
format using LINUX/UNIX commands in combination with GMT. Additional information
about GMT can be found at: www.soest.hawaii.edu/gmt and additional information
about the multibeam data processing is recorded in the cruise metadata.
20070122
Raster
Grid Cell
4432
5143
1
Universal Transverse Mercator
3
0.9996
-165
0
500000
0
Row and Column
20
20
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. 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
this survey has not been developed. Therefore, the accuracy of depth
measurements should be considered to be within 1 meter.
none
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)
mailing and physical address
NOAA IRC
NMFS/PIFSC/CRED
1845 WASP Blvd., Building 176
Honolulu
HI
96818
808 725-5360
808 725-5429
nmfs.pic.credinfo@noaa.gov
e-mail preferred
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.
Arc ASCII, .asc
Arc ASCII can be converted to Arc Raster using ArcToolbox Conversion Tools.
ftp://ftp.soest.hawaii.edu/pibhmc/website/data/nwhi/bathymetry/Necker_20m.asc.zip
None
20190605
20090219
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)
mailing and physical address
NOAA IRC
NMFS/PIFSC/CRED
1845 WASP Blvd., Building 176
Honolulu
HI
96818
808 725-5360
808 725-5429
nmfs.pic.credinfo@noaa.gov
e-mail preferred
FGDC Content Standards for Digital Geospatial Metadata
FGDC-STD-001-1998
Universal Time
None
None
}
20090219023659
None
20000101
20021115
https://www.coris.noaa.gov/metadata/records/html/cred_gridded_bathy_necker_nwhi_20m_asc.html
2944