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

browse graphicPerspective view of DEM
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.
Cite this dataset when used as a source.
  • ID not available.
gov.noaa.ngdc.mgg.dem:1521
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Distribution Formats Format not available
    Distributor Distributor information not available
    Dataset No POCs available for this dataset
    Time Period 1888-01-01 to Present
    Spatial Reference System urn:ogc:def:datum:EPSG::5103
    Spatial Bounding Box Coordinates
    N: 29.7
    S: 28.6
    E: -89.8
    W: -91.6
    Spatial Coverage Map
    General Documentation
    Associated Resources
    Publication Dates
    • publication: 2012-01-28
    Edition First
    Data Presentation Form mapDigital
    Dataset Progress Status Complete - production of the data has been completed
    Data Update Frequency As needed
    Purpose Developed for the Hurricane Forecast Improvement Project (HFIP)
    Use Limitations
    • 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 Geophysical Data Center. Not subject to copyright protection within the United States.
    Originators
    • DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
    • DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
    Custodians
    • DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
    Publishers
    • DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
    Theme keywords Global Change Master Directory (GCMD) Science and Services Keywords
    • Earth Science > Oceans > Bathymetry/Seafloor Topography > Seafloor Topography
    • Earth Science > Oceans > Bathymetry/Seafloor Topography > Bathymetry
    • Earth Science > Oceans > Bathymetry/Seafloor Topography > Water Depth
    • Earth Science > Land Surface > Topography > Terrain Elevation
    • Earth Science > Land Surface > Topography > Terrain Elevation > Topographical Relief Maps
    • Earth Science > Oceans > Coastal Processes > Coastal Elevation
    NASA/GCMD Data Resolution Keywords
    • 1 meter - < 30 meters
    • < 1 meter
    Uncontrolled
    • Coastal Relief
    • Gridded elevations
    • Integrated bathymetry and topography
    Global Change Master Directory (GCMD) Service Keywords
    • DATA ANALYSIS AND VISUALIZATION > GEOGRAPHIC INFORMATION SYSTEMS > WEB-BASED GEOGRAPHIC INFORMATION SYSTEMS
    • DATA MANAGEMENT/DATA HANDLING > DATA SEARCH AND RETRIEVAL
    • DATA ANALYSIS AND VISUALIZATION > VISUALIZATION/IMAGE PROCESSING
    Global Change Master Directory (GCMD) Service Keywords
    • DATA ANALYSIS AND VISUALIZATION > GEOGRAPHIC INFORMATION SYSTEMS > WEB-BASED GEOGRAPHIC INFORMATION SYSTEMS
    • DATA MANAGEMENT/DATA HANDLING > DATA SEARCH AND RETRIEVAL
    • DATA ANALYSIS AND VISUALIZATION > VISUALIZATION/IMAGE PROCESSING
    Platform keywords NASA/GCMD Platform Keywords
    • Models/Analyses > DEM > Digital Elevation Model
    Place keywords Global Change Master Directory (GCMD) Location Keywords
    • Continent > North America > United States of America > Louisiana
    • Ocean > Atlantic Ocean > North Atlantic Ocean > Gulf of Mexico
    • Vertical Location > Land Surface
    • Vertical Location > Sea Floor
    Uncontrolled
    • South Louisiana
    Project keywords Global Change Master Directory (GCMD) Project Keywords
    • ICSU-WDS > International Council for Science - World Data System
    Keywords
      Use Constraints No constraint information available
      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.
      Fees Fee information not available.
      Lineage information for: dataset
      Processing Steps
      • 2010-08-28T00:00:00 - All datasets obtained by NGDC were converted to common horizontal and vertical datums of NAD 83 geographic and NAVD 88, respectively, using Proj4 and VDatum transformation tool. They were also converted to common file format, ESRI point shapefiles, for visualization and inspection.
      • 2010-09-01T00:00:00 - Datasets were visually inspected with ArcGIS for identification and editing of data anomalies. Datasets were then compared with overlapping datasets to ensure data consistency.
      • 2010-09-24T00:00:00 - Coastline datasets were merged and adjusted to fit satellite imagery.
      • 2010-09-30T00:00:00 - xyz files of the bathymetric data were surfaced using GMT's 'surface' tool onto a 1 arc-second grid that interpolated to fill empty cells. Points extracted every 10 meters along the coastline were also included to ensure that the bathymetric grid reached zero at the coast. The resulting netCDF grid was clipped to the coastline to remove values over land.
      • 2010-10-20T00:00:00 - xyz files for each input dataset were gridded using MB-System's 'mbgrid' tool, which utilizes a high-tension spline interpolation method to fill grid cells with no input elevation values. Preferential weighting was given to more recent, higher-accuracy datasets. Gridding was performed with a 5% data buffer.
      • 2010-10-24T00:00:00 - The NAVD 88 DEM was quantitatively evaluated by comparing with source datasets and with elevation values extracted from NGS geodetic monuments. It was visually evaluated by converting to UTM-zone coordinates (units of meters horizontally and vertically) and then creating a slope grid to identify gridding artifacts in the DEM.
      Source Datasets
      • NOS Hydrographic Surveys
        • CSDL non-superceded NOS Hydrographic Survey Database (download)
          Digital database of non-superceded NOS hydrographic surveys that date back to the late 19th century.
        • Description of Source: Source Contribution: Hydrographic surveys provided to NGDC by CSDL ; Source Type: digital files via FTP
        • Temporal extent used: 1897-01-01 to 2001-01-01
      • USACE Hydrographic Surveys
        • USACE New Orleans District Hydrographic Surveys (download)
          Digital database of hydrographic surveys in New Orleans District
        • Description of Source: Source Contribution: Hydrographic surveys for New Orleans District ; Source Type: online
        • Temporal extent used: Unknown to
      • Composite Shoreline and associated data of Louisiana State Composite, LA_COMP
        • Composite Shoreline and associated data of Louisiana State Composite, LA_COMP (download)
          The shoreline and associated data are a representation based on an office interpretation of imagery at the time of photographs taken 19780101 to 19860301.
        • Description of Source: Source Contribution: composite shoreline downloaded from web site. ; Source Type: online
        • Temporal extent used: 1978-01-01 to 1986-01-01
      • Louisiana State topographic lidar
        • Atlas: The Louisiana Statewide GIS. (download)
          Lidar data distribution of 1999 Louisiana Lidar.
        • Description of Source: Source Contribution: topographic lidar ; Source Type: online
        • Temporal extent used: Unknown to
      Acquisition Information (collection)
      Instrument
        Platform
        • Digital Elevation Model
        Operation
        • NOAA HFIP DEM Project
        Last Modified: 2017-12-14
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