The document provides information on numerous data sources for bathymetric and benthic data in the Pacific Islands region. It summarizes several key online data repositories including the NOAA National Geophysical Data Center (NGDC) which provides access to global bathymetry data grids and tools to create custom bathymetry grids. It also describes the Hawaii Mapping Research Group's synthesis of multibeam sonar data for the Main Hawaiian Islands, which was created by compiling all existing MHI multibeam data and processing it using open-source MB-System software to produce a publicly available gridded dataset. Issues around completely filling gaps in the synthesized coverage are also discussed.

1. Bathymetric and Related
Benthic Data
Susan Vogt, GIS Specialist, NOAA Pacific Islands Science Center, Coral Reef
Ecosystem Division
Joyce Miller, Oceanographer, NOAA Pacific Islands Science Center, Coral
Reef Ecosystem Division
Robert O’Conner, Fisheries Information Specialist, NOAA Pacific Islands
Region Office

2. Data Sources – Lots!
USGS 20-meter Main Hawaiian Islands bathy data
http://wrgis.wr.usgs.gov/dds/dds-55/pacmaps/hw_index.htm
USGS - US Pacific Territories DRGs
http://hbmp.hawaii.edu/website/pacific/
SOPAC Map Servers
http://www.sopac.org/tiki/tiki-index.php?page=Maps
Currents, SST, SSH, Opendap, etc
http://apdrc.soest.hawaii.edu/w_data/ocean3.htm
Shorelines and Habitat for US Pacific Territories
http://ccma.nos.noaa.gov/products/biogeography/us_pac_terr/h
tm/data.htm
NWHI IKONOS, bathy, habitat
http://ccma.nos.noaa.gov/ecosystems/coralreef/nwhi/welcome.
html
CORIS - bathy and IKONOS
http://coris.noaa.gov/
Hawaii Bathy Grids (seamless) - ngdc
http://www.ngdc.noaa.gov/mgg/coastal/grddas10/grddas10.htm
Global Bathy Grids (etopo2 - smith and sandwell) - ngdc
http://www.ngdc.noaa.gov/mgg/fliers/01mgg04.html

3. Data Sources – Even More!
NOAA DEMs http://www.ngdc.noaa.gov/mgg/inundation/
NOAA Real Time Satellite Data IMS
http://nowcoast.noaa.gov/
UH Coastal Geology Data- LIDAR, aerial photos,
LANDSAT, DEMs
http://www.soest.hawaii.edu/coasts/
Everything Nautical Charts - ENCs and RNCs
http://www.csc.noaa.gov/products/enc/
http://chartmaker.ncd.noaa.gov/mcd/enc/download.htm
http://nauticalcharts.noaa.gov/mcd/Raster/Index.htm
NMFS GIS Committee Data
http://www.nmfs.noaa.gov/gis/data/index.htm
BioGeo - habitat and imagery data
http://ccma.nos.noaa.gov/about/biogeography/
NOS - bathy and remotely sensed data
http://www.coralreef.noaa.gov/
http://nosdataexplorer.noaa.gov/nosdataexplorer/

4. How to make sense of it all?
• Links will be up on HIGICC
web site
• Highlight three useful sites
today
– Electronic Navigational Charts
– NGDC GEODAS
– HMRG Main Hawaiian Island
Multibeam Synthesis
• Keep partnership opportunities
in mind when scoping new
projects

5. Electronic Navigational Charts
(ENC®s)
• Produced by the
Office of Coast
Survey
• IHO S-57
international
exchange format
(non-proprietary,
publicly available)
• Not the same as a
raster chart

6. Accessing and Using ENC®s
Two step process:
Select and Download ENC
download ENC Data Handler
data extension for
ArcGIS

7. Accessing and Using ENC®s
• Download ENCs
from the Office of
Coast Survey web
site:
http://nauticalcharts.noaa.go
v/mcd/enc/download.htm
• Select graphically or
by text
• Place, then collect
order by
downloading

8. Accessing and Using ENC®s
• ENC Data Handler
extension from Coastal
Services Center
http://www.csc.noaa.gov/
products/enc/
• Easy to download
• Comes with easy to
follow instruction PDF

9. Accessing and Using ENC®s
• Follow ENC Data
Handler instructions
to import downloaded
data into geodatabase
• Use ENC Data
Handler extension in
Arc to apply special
nautical chart
symbology to each of
the subtypes
• Please note that
these data are Not
For Navigational
Purposes!

10. National Geophysical Data Center
(NGDC)

11. Global Bathy Data - ETOPO2v2
Data Sources:
• Smith & Sandwell
• GLOBE (Global Land
One-kilometer Base
Elevation)
• IBCAO (International
Bathymetric Chart of
the Arctic Ocean)
• NGDC Coastal Relief
Model
• NGDC Great Lakes
Bathymetric Data
• Caspian Sea
Bathymetry

12. GEODAS (GEOphysical DAta
System)
http://www.ngdc.noaa.gov/mgg/bathymetry/relief.html

13. Create Custom Grid

14. GEODAS - Create Custom Grid

16. Main Hawaiian Islands Multibeam
Synthesis
•The Hawai‘i Undersea
Research Laboratory
(HURL)
•The Pacific Islands
Benthic Habitat Mapping
Center (PIBHMC)

18. Data Exploration - Microsoft's
Virtual Earth

21. MHI Multibeam Bathymetric Synthesis
• available for download at www.soest.hawaii.edu/HMRG
• GMT netCDF and ArcGIS ASCII format
Great, but how was it created???

22. www.ldeo.columbia.edu/res/pi/MB-System
• open source software package for the processing
and display of bathymetry data
• widely used in the seafloor mapping community
1. Two years of SOEST money allocated to create a data synthesis
starting in 2004
2. Compile all existing multibeam bathymetry for the MHI
• Contact all PI’s who have collected multibeam data
• Permission to release these data in an online synthesis
3. Master list of all data in MB-System format
4. Quality control - which files are “good” enough to include?
• Time intensive and still not complete
• Troublesome data edited in XYZ space using SAIC’s SABER
5. Data broken down into 1x1 degree boxes to grid them at 50 m resolution
6. Ongoing data addition and quality control

23. Let’s do it for this small area off of the windward coast of Oahu!
Coordinates
22 N
158 W 157.5 W
21.5 N

24. Use MB-System to parse master list file based on coordinates:
mbdatalist –Rcoordinates –Imasterlist >! parsed_list
A few examples from the parsed_list:
KM-em1002/km0302/jd070/gsf/KMMmbb030700356.d01 121 200.00000
Lidar/shoals/Oahu/Oahu01.pos.xyz 162 250.00000
JAMSTEC-nuuanu99/sb1999908131531.mb41 41 9.00000
USGS98/oahu_98/gsf/OA03-980330759.d01 121 250.00000
FILE PATH AND NAME FILE FORMAT WEIGHT
Format 121 = SAIC’s Generic Sensor Format
Format 162 = Longitude, Latitude, Positive Depth Format
Format 41 = SeaBeam 2100 series Format
The list for the small area off of windward Oahu contains:
• 460 files
• 10 different file format types

25. Gaussian Weighted Mean Gridding Alogrithm in MB-System
mbgrid –F1 –Rcoordinates –A2 –G3 –C2 –E50/50/meters –Iparse_list –Ooutput_file
negative interpolation grid size
bathymetry
Put computer processors to work:
62200 data points processed in KM-em1002/km0512/jd159/gsf/KMmba051590626.d01.fbt
55800 data points processed in KM-em1002/km0512/jd159/gsf/KMmba051590641.d01.fbt
30982 data points processed in KM-em1002/km0512/jd159/gsf/KMmba051590656.d01.fbt
65829 data points processed in KM-em1002/km0512/jd159/gsf/KMmba051591400.d01.fbt
11479 data points processed in KM-em1002/km0512/jd159/gsf/KMmba051591415.d01.fbt
69254 data points processed in KM-em1002/km0512/jd159/gsf/KMmba051591418.d01.fbt
68793 data points processed in KM-em1002/km0512/jd159/gsf/KMmba051591433.d01.fbt
67351 data points processed in KM-em1002/km0512/jd159/gsf/KMmba051591448.d01.fbt
65939 data points processed in KM-em1002/km0512/jd159/gsf/KMmba051591503.d01.fbt
24686 data points processed in KM-em1002/km0512/jd159/gsf/KMmba051591518.d01.fbt
…………Outputs a GMT netCDF grid file and a postscript image……….

26. …………convert netCDF grid to ASCII and import to ArcGIS……….
…download DEM’s and imagery from www.soest.hawaii.edu/coasts...

28. Issues – Filling in the Gaps

29. Issues – Filling in the Gaps