Mississippi Sound, MS/LA/AL (G170) Bathymetric Digital Elevation Model (30 meter resolution) Derived From Source Hydrographic Survey Soundings Collected by NOAA

Description

Bathymetry for Mississippi Sound was derived from thirty-three surveys containing 371,210 soundings. Five overlapping, older, less accurate surveys were omitted before tinning. The average distance between soundings was 89 meters. The thirty-three surveys used dated from 1960 to 1979. The range of soundings for the surveys used was 0.8 meters to -17.6 meters at mean low water. A mean high water value of 0.5 meters was assigned to the shoreline. Twenty-five points were found that were not consistent with the surrounding points. These were removed prior to tinning. DEM grid values outside the shoreline (on land) were assigned null values (-32676). Mississippi Sound has forty-four 7.5 minute DEMs and three one degree DEMs. The 1 degree DEMs were generated from the higher resolution 7.5 minute DEMs which covered the estuary. A Digital Elevation Model (DEM) contains a series of elevations ordered from south to north with the order of the columns from west to east. The DEM is formatted as one ASCII header record (A- record), followed by a series of profile records (B- records) each of which include a short B-record header followed by a series of ASCII integer elevations (typically in units of 1 centimeter) per each profile. The last physical record of the DEM is an accuracy record (C-record). The 7.5-minute DEM (30- by 30-m data spacing) is cast on the Universal Transverse Mercator (UTM) projection. It provides coverage in 7.5- by 7.5-minute blocks. Each product provides the same coverage as a standard USGS 7.5-minute quadrangle but the DEM contains over edge data. Coverage is available for many estuaries of the contiguous United States but is not complete.

Resources

Name Format Description Link
32 Download NetCDF File https://www.ngdc.noaa.gov/thredds/fileServer/regional/mississippi_sound_g170_30m.nc
21 OPeNDAP Dataset Access Form https://www.ngdc.noaa.gov/thredds/dodsC/regional/mississippi_sound_g170_30m.nc.html
50 Web Coverage Service GetCapabilities https://www.ngdc.noaa.gov/thredds/wcs/regional/mississippi_sound_g170_30m.nc?service=WCS&version=1.0.0&request=GetCapabilities
52 Web Map Service GetCapabilities https://www.ngdc.noaa.gov/thredds/wms/regional/mississippi_sound_g170_30m.nc?service=WMS&version=1.3.0&request=GetCapabilities
21 Download a subset of the NetCDF https://www.ngdc.noaa.gov/thredds/ncss/regional/mississippi_sound_g170_30m.nc/dataset.html
32 NetCDF Markup Language file https://www.ngdc.noaa.gov/thredds/ncml/regional/mississippi_sound_g170_30m.nc?catalog=https%3A%2F%2Fwww.ngdc.noaa.gov%2Fthredds%2Fcatalog%2Fregional%2Fcatalog.html&dataset=regionalDatasetScan%2Fmississippi_sound_g170_30m.nc
0 map search https://www.ngdc.noaa.gov/mgg/bathymetry/estuarine
0 text search https://www.ngdc.noaa.gov/mgg/bathymetry/estuarine

Tags

  • bathymetry
  • oceans
  • mississippi
  • mississippi sound
  • 1 meter - < 10 meters
  • coastal elevation
  • 1 meter - < 30 meters
  • earth science
  • bathymetry/seafloor topography
  • gridded elevations
  • coastal relief
  • water depth
  • louisiana
  • coastal processes
  • alabama
  • seafloor topography

Topics

Categories