This data base may be used by raster or vector geographic information
systems (GIS) and non-GIS data bases to assess the risk of coastlines
to erosion or sea level rise. The data base integrates point, line,
and polygon data for the U.S. East Coast into 0.25 X 0.25 degree
latitude/longitude grid cells. Each coastal grid cell contains data
on geology, geomorphology, ... elevation, wave heights, tidal ranges,
shoreline displacement (erosion), and sea-level trends. For several
of these data sets minimum, mean, and maximum data values are
available. These data variables may be divided into two basic classes,
one that measures erosion potential and one that is related to
inundation risk. The inundation risk of a given coastal grid cell may
be estimated based on sea level trends and elevations; whereas the
erosion risk may be determined based on geology, geomorphology,
shoreline displacement, tidal ranges, and wave heights.
To allow for the identification of coastlines at risk from coastal
erosion or sea level rise, 7 of the 22 original variables in this data
base were classified and used to create 7 relative risk variables.
These relative risk variables may be used to calculate a coastal
vulnerability index for each grid cell. The data for the 22 original
variables and 7 risk variables, for a total of 29 data variables, have
been placed into the following data groups:
(1) Gridded polygon data for the 22 original data variables. Data
includes elevations, geology, geomorphology, sea-level trends,
shoreline displacement (erosion), tidal ranges, and wave heights.
(2) Supplemental data for the stations used in calculating the
sea-level trend and tidal range data sets.
(3) Gridded polygon data for the seven classified risk variables. The
risk variables are classified versions of the following data
variables: mean coastal elevation, geology, geomorphology, local
subsidence trends, mean shoreline displacement, maximum tide range,
and the maximum significant wave height.
This data base consists of several ARC/INFO export files and flat
ASCII data files (provided to extend the use of the data to
non-ARC/INFO users) with the data placed into 0.25 X 0.25 degree
latitude/longitude grid cells. A 1:2,000,000 digitized coastline of
the U.S. East Coast, FORTRAN and SAS retrieval files, and a
descriptive file have also been provided.
All CDIAC numerical data packages include copies of pertinent
literature discussing the data, summaries discussing the background,
source and scope of the data, as well as applications limitations and
restrictions of the data.
More information on this data set is available from: