DATA to accompany:

"Bathymetry of the Tonga Trench and Forearc: A Map Series"
Marine Geophysical Researches


Original date: 29 August 1999
Last update: 19 October 2011

Dawn Wright
Department of Geosciences
Oregon State University
Corvallis, OR 97331-5506
(541) 737-1229
(541) 737-1200 (fax)
dawn@dusk.geo.orst.edu


Have old-style GMT grids like the ones below that need to get into ArcGIS 9/10? In latest version of GMT do: grdreformat -fg oldformat.grd newformat.nc

The Map Series

The grids containing the bathymetry data that were used in creating the large-scale maps are available for download here. The grids are in GMT-format (v. 3.0 or lower) with a grid spacing equivalent to 500 m, except for Map 4 (grid spacing of 30 seconds). They have been compressed or "gnu-zipped" with Unix utilities where appropriate (these files can also be uncompressed by WinZip on a PC).
To download, hold down RIGHT mouse button and select "Save Link As":

Map 1 grid (all data, 1.5Mb)
Map 1 SB2K grid (Sea Beam 2000 data only, 632K)

Map 2 grid (all data, 1.9Mb)
Map 2 SB2K grid (Sea Beam 2000 data only, 1Mb)

Map 3 grid (all data, 2.1Mb)

Map 4 grid (all data, 831K)

Here are the color POSTSCRIPT FILES of the maps so that you can print them out on your own plotter.
To download, hold down RIGHT mouse button and select "Save Link As":

Map 1 Postscript File (394K)
Map 2 Postscript File (484K)
Map 3 Postscript File (380K)
Map 4 Postscript File (229K)

Original Sea Beam 2000 ping-edited data (from Boomerang 8 only) are available here in an 88 Mb compressed tar file.

Data list for Map 1
Data list for Map 2
Data list for Map 3
Data list for Map 4

Contact Dawn for older Sea Beam and other digital data.


The Figures

The grids containing the bathymetry data that were used in creating the page-size figures are available for download here. They contain ONLY Sea Beam 2000 data. The grids are in GMT-format with a grid spacing equivalent to 200 m. They have been compressed with the Unix "compress" utility where appropriate.
To download, hold down RIGHT mouse button and select "Save Link As":

Figure 7 grid (1.2Mb)
Figure 8 grid (1.9Mb)
Figure 9 grid (3.2Mb)
Figure 10 grid (1.4Mb)
Figure 11 grid (641K)
Figure 12 grid (550K)

Here are the color POSTSCRIPT FILES of the figures so that you can print them out on your own printer.
To download, hold down RIGHT mouse button and select "Save Link As":

Figure 7 shaded relief (2.4Mb)
Figure 8 shaded relief (4.3Mb)
Figure 9 (7.6Mb)
Figure 10 (587K)
Figure 11 (1.3Mb)
Figure 12 (1.7Mb)


3-D Visualizations

Explore Tonga in 3-D by clicking HERE


Last updated: March 11, 2013

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