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    • Southern Louisiana 1/3 arc-second NAVD 88 Coastal Digital Elevation Model

    Metadata Updated: October 18, 2024

    Modeling and mapping of coastal processes (e.g. tsunamis, hurricane storm-surge, and sea-level rise) requires digital representations of Earth's solid surface, referred to as digital elevation models (DEMs). Some modeling utilizes structured, square-cell DEMs, while others utilize unstructured grids that have no regular cell size or pattern. Usually, these different DEM types are developed independently, even though they are built from the same source bathymetric and topographic datasets. The National Geophysical Data Center (NGDC), an office of the National Oceanic and Atmospheric Administration (NOAA), has developed two bathymetric-topographic square-celled DEMs and one bathymetric-topographic unstructured DEM of southern Louisiana. The DEMs were developed for the Hurricane Forecast Improvement Project (HFIP), with the purpose of developing a new methodology for unstructured grid production from structured square-celled grids. The 1/3 arc-second DEM referenced to North American Vertical Datum of 1988 (NAVD 88) was carefully developed and evaluated. A NAVD 88 to mean high water (MHW) 1/3 arc-second conversion grid derived from VDatum project areas was created to model the relationship between NAVD 88 and MHW in the southern Louisiana region. NGDC combined the NAVD 88 DEM and the conversion grid to develop a 1/3 arc-second MHW DEM. The NAVD 88 DEM was generated from diverse digital datasets in the region. The DEMs were developed to be used for storm surge inundation and sea level rise modeling. The source bathymetric and topographic datasets used in the development of the NAVD 88 DEM were utilized along with the NAVD 88 DEM and derivative grids to develop the NAVD 88 unstructured DEM.

    Access & Use Information

    License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

    Downloads & Resources

    Dates

    Metadata Date June 6, 2019
    Metadata Created Date October 18, 2024
    Metadata Updated Date October 18, 2024
    Reference Date(s) January 28, 2012 (publication)
    Frequency Of Update asNeeded

    Metadata Source

    Harvested from NGDC MGG DEM

    Other Data Resources

    Graphic Preview

    Thumbnail of DEM

    Additional Metadata

    Resource Type Dataset
    Metadata Date June 6, 2019
    Metadata Created Date October 18, 2024
    Metadata Updated Date October 18, 2024
    Reference Date(s) January 28, 2012 (publication)
    Responsible Party NOAA National Centers for Environmental Information (Point of Contact)
    Contact Email
    Guid gov.noaa.ngdc.mgg.dem:1521
    Access Constraints Distribution liability: NOAA and NCEI make no warranty, expressed or implied, regarding these data, nor does the fact of distribution constitute such a warranty. NOAA and NCEI cannot assume liability for any damages caused by any errors or omissions in these data. If appropriate, NCEI can only certify that the data it distributes are an authentic copy of the records that were accepted for inclusion in the NCEI archives.
    Bbox East Long -89.8
    Bbox North Lat 29.7
    Bbox South Lat 28.6
    Bbox West Long -91.6
    Coupled Resource
    Frequency Of Update asNeeded
    Graphic Preview Description Thumbnail of DEM
    Graphic Preview File https://maps.ngdc.noaa.gov/thumbnails/DEM/1521.png
    Graphic Preview Type PNG
    Harvest Object Id d8926619-4e39-429a-9735-bb3abd96225e
    Harvest Source Id 4969dc3d-1269-48b4-a254-dfee8489c5c9
    Harvest Source Title NGDC MGG DEM
    Licence Not to be used for navigation. Although these data are of high quality and useful for planning and modeling purposes, they are not suitable for navigation. For navigation, please refer to the NOS nautical chart series., Produced by the NOAA National Centers for Environmental Information. Not subject to copyright protection within the United States.
    Lineage
    Metadata Language eng; USA
    Metadata Type geospatial
    Old Spatial {"type": "Polygon", "coordinates": [[[-91.6, 28.6], [-89.8, 28.6], [-89.8, 29.7], [-91.6, 29.7], [-91.6, 28.6]]]}
    Progress completed
    Spatial Data Service Type ArcGIS Feature Service
    Spatial Reference System urn:ogc:def:crs:EPSG::4326
    Spatial Harvester True
    Temporal Extent Begin 1888-01-01

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