Between August 1994 and July 1999, biannual beach profiles were collected at 42 Oahu and 36 Maui locations. Surveys were conducted at approximately summer-winter intervals. Profile data on this CDROM are presented in both Microsoft EXCEL 97/98 & 5.0/95 Workbook (.xls) format and comma separated value (.csv) format. Graphical representation of the surveys (x vs. z and x vs. y) are presented in EXCEL format only. Site descriptions, including beach location, directions to site, GPS information, and a description of Reference Points used, are available in both EXCEL and ADOBE ACROBAT .pdf format.
Description of EXCEL files:
EXCEL files include four separate data worksheets or charts within the summary file:
Description of .csv files:
csv files contain the SITE_SUMMARY.txt data in comma separated value format.
Description of survey data file:
Conversion to Local Tidal Datum:
The local tidal datum is the standard vertical datum used by the National Geodetic Survey (NGS) in the Hawaiian Islands. Surveys collected as part of this study were initially referenced, both horizontally and vertically, to a primary reference point along an individual profile line. Where GPS positions were available, surveys were converted to the local Hawaiian tidal vertical datum. GPS information used to covert the data to LTD are included in the SITE_SUMMARY.txt worksheet.
Volume Change Calculation Boundaries:
Boundaries used to calculate beach profile volume change during
the course of the study are also included in SITE_SUMMARY.txt
worksheet. X-min is defined by one of the following, depending
on local beach morphology and extent of coastal modification:
1) the landward edge of the primary dune; 2) the vegetation line;
or 3) the seaward edge of a road, seawall, or other structural
feature limiting the natural beach. Z-max is defined by: 1) profile
closure where identifiable; 2) the sand/rock interface; and/or
3) the intersection between the sloping shoreface and planar
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Last modified Sept. 6, 2001
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Department of the Interior U.S. Geological Survey Geologic Division Western Region Coastal & Marine Geology