NOAA vDatum - tidal, orthometric and ellipsoidal vertical datums

A useful transofrmation tool from NOAA - vDatum. VDatum is a free software tool being developed jointly by NOAA's National Geodetic Survey (NGS), Office of Coast Survey (OCS), and Center for Operational Oceanographic Products and Services (CO-OPS). VDatum is designed to vertically transform geospatial data among a variety of tidal, orthometric and ellipsoidal vertical datums - allowing users to convert their data from different horizontal/vertical references into a common system and enabling the fusion of diverse geospatial data in desired reference levels. See http://vdatum.noaa.gov/

NOAA vDatum - tidal, orthometric and ellipsoidal vertical datums

Vector Shorelines for the U.S. Gulf of Mexico

There are nine GIS data layers offered for each state in the Gulf of Mexico. These include: four vector shorelines, an offshore baseline used for generating shore-normal transects, transects for long- and short- term shoreline change rates, transect/shoreline intersection positions, and a vector layer to show the spatial extents of beach nourishment projects. See http://pubs.usgs.gov/of/2004/1089/gis-data.html

Vector Shorelines for the U.S. Gulf of Mexico