Document Title - Geoscience Australia

Lord Howe High Resolution Grids
National Geophysical Data Center
The National Geophysical Data Center (NGDC; http://www.ngdc.noaa.gov) is a part of the US
Department of Commerce, National Oceanographic & Atmospheric Administration (NOAA). It is
the primary data centre for US derived marine geophysical data, but also houses data from other
nations. Suitable data from four surveys were found at this site and their distributions are shown in
Figure 17. These surveys are:
19920013
In 1988 the HMY Britannia sailed past Lord Howe Island. The transit satellite navigation system
was used with accuracy in the vicinity of 500 to 1500 m. More details on this survey can be found at:
http://www.ngdc.noaa.gov/idb/struts/results?op_0=eq&v_0=19920013&t=102697&s=6&d=7 which
is the link to the NGDC.
DME06
In 1971 the Russian vessel the Dmitrij Mendeleev surveyed near Lord Howe Island. The navigation
system used Loran-C, radar and sextant, which has a low accuracy in to order of 3,500 to 10,000 m.
More details on this survey can be found at the following link to the NGDC website at:
http://www.ngdc.noaa.gov/idb/struts/results?op_0=eq&v_0=DME06&t=102697&s=6&d=7.
EW9202
In 1992 the R/V Maurice Ewing was transiting past the east coast of Lord Howe Island with the
swath mapping equipment turned on. The transit satellite navigation system was used with an
accuracy of 500 to 1500 m. More details on this survey can be found at the following link to the
NGDC:http://www.ngdc.noaa.gov/idb/struts/results?op_0=eq&v_0=EW9202&t=102697&s=6&d=7.
VI49
In 1971 the Russian vessel the Vityaz surveyed near Lord Howe Island. No navigation system is
stated for this survey; given the vintage it is assumed that the transit satellite system was used with
an accuracy of 500 to 1500 m. More details on this survey can be found at the following link to the
NGDC: http://www.ngdc.noaa.gov/idb/struts/results?op_0=eq&v_0=VI49&t=102697&s=6&d=7.
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