Long Island Sound, NY/CT (M040) Bathymetric Digital Elevation Model (30 meter resolution) Derived From Source Hydrographic Survey Soundings Collected by NOAA
Bathymetry for Long Island Sound was derived from fifty-five surveys containing 562,596 soundings. Twenty-four older, less accurate, overlapping surveys were entirely omitted, and the overlap from eight older, less accurate surveys was omitted before tinning the data. The average separation between soundings was 77 meters. The fifty-five surveys used dated from 1931 to 1990. Approximately 40 percent of the surveys were from 1931 to 1939. The total range of sounding data was 2.1 meters to - 113.4 meters at mean low water. Mean high water values between 0.6 and 2.3 meters were assigned to the shoreline. Eighty-eight points were found that were not consistent with the surrounding data. These were removed prior to tinning. DEM grid values outside the shoreline (on land) were assigned null values (-32676). Long Island Sound has fifty-one 7.5 minute DEMs and five 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
7 resources available
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Download NetCDF File
NETCDF -
OPeNDAP Dataset Access Form
TEXT/HTML -
Web Coverage Service GetCapabilities
NETCDF -
Web Map Service GetCapabilities
NETCDF -
Download a subset of the NetCDF
TEXT/HTML -
NetCDF Markup Language file
NETCDF -
project web page
TEXT/HTML
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Complete Metadata
| @type | dcat:Dataset |
|---|---|
| accessLevel | non-public |
| contactPoint |
{ "fn": "NOAA National Centers for Environmental Information", "@type": "vcard:Contact", "hasEmail": "mailto:dem.info@noaa.gov" } |
| describedByType | application/octet-steam |
| description | Bathymetry for Long Island Sound was derived from fifty-five surveys containing 562,596 soundings. Twenty-four older, less accurate, overlapping surveys were entirely omitted, and the overlap from eight older, less accurate surveys was omitted before tinning the data. The average separation between soundings was 77 meters. The fifty-five surveys used dated from 1931 to 1990. Approximately 40 percent of the surveys were from 1931 to 1939. The total range of sounding data was 2.1 meters to - 113.4 meters at mean low water. Mean high water values between 0.6 and 2.3 meters were assigned to the shoreline. Eighty-eight points were found that were not consistent with the surrounding data. These were removed prior to tinning. DEM grid values outside the shoreline (on land) were assigned null values (-32676). Long Island Sound has fifty-one 7.5 minute DEMs and five 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. |
| distribution |
[ { "@type": "dcat:Distribution", "title": "Download NetCDF File", "format": "NETCDF", "mediaType": "application/x-netcdf", "description": "Download NetCDF File", "downloadURL": "https://www.ngdc.noaa.gov/thredds/fileServer/regional/long_island_sound_m040_30m.nc", "describedByType": "application/octet-stream" }, { "@type": "dcat:Distribution", "title": "OPeNDAP Dataset Access Form", "accessURL": "https://www.ngdc.noaa.gov/thredds/dodsC/regional/long_island_sound_m040_30m.nc.html", "mediaType": "text/html", "description": "OPeNDAP Dataset Access Form", "describedByType": "application/octet-stream" }, { "@type": "dcat:Distribution", "title": "Web Coverage Service GetCapabilities", "format": "NETCDF", "mediaType": "application/x-netcdf", "description": "Web Coverage Service GetCapabilities", "downloadURL": "https://www.ngdc.noaa.gov/thredds/wcs/regional/long_island_sound_m040_30m.nc?service=WCS&version=1.0.0&request=GetCapabilities", "describedByType": "application/octet-stream" }, { "@type": "dcat:Distribution", "title": "Web Map Service GetCapabilities", "format": "NETCDF", "mediaType": "application/x-netcdf", "description": "Web Map Service GetCapabilities", "downloadURL": "https://www.ngdc.noaa.gov/thredds/wms/regional/long_island_sound_m040_30m.nc?service=WMS&version=1.3.0&request=GetCapabilities", "describedByType": "application/octet-stream" }, { "@type": "dcat:Distribution", "title": "Download a subset of the NetCDF", "accessURL": "https://www.ngdc.noaa.gov/thredds/ncss/regional/long_island_sound_m040_30m.nc/dataset.html", "mediaType": "text/html", "description": "Download a subset of the NetCDF", "describedByType": "application/octet-stream" }, { "@type": "dcat:Distribution", "title": "NetCDF Markup Language file", "format": "NETCDF", "mediaType": "application/x-netcdf", "description": "NetCDF Markup Language file", "downloadURL": "https://www.ngdc.noaa.gov/thredds/ncml/regional/long_island_sound_m040_30m.nc?catalog=https%3A%2F%2Fwww.ngdc.noaa.gov%2Fthredds%2Fcatalog%2Fregional%2Fcatalog.html&dataset=regionalDatasetScan%2Flong_island_sound_m040_30m.nc", "describedByType": "application/octet-stream" }, { "@type": "dcat:Distribution", "title": "project web page", "accessURL": "https://www.ngdc.noaa.gov/mgg/bathymetry/estuarine", "mediaType": "text/html", "description": "text search", "describedByType": "application/octet-stream" } ] |
| identifier | https://data.noaa.gov/waf/NOAA/NESDIS/NGDC/MGG/DEM/iso/xml/long_island_sound_m040_30m.xml |
| isPartOf | NOAA NOS Estuarine Bathymetry |
| issued | 1998-06-06T00:00:00.000+00:00 |
| keyword |
[ "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 > Oceans > Coastal Processes > Coastal Elevation", "1 meter - < 30 meters", "1 meter - < 10 meters", "Coastal Relief", "Gridded elevations", "Bathymetry", "Long Island Sound, NY/CT", "New York", "Connecticut" ] |
| language |
[]
|
| license | https://creativecommons.org/publicdomain/zero/1.0/ |
| modified | 1998-06-06T00:00:00.000+00:00 |
| publisher |
{ "name": "NOAA's National Ocean Service, Special Projects (SP)", "@type": "org:Organization" } |
| rights | otherRestrictions |
| spatial | -71.851266,40.732176,-73.851575,41.462109 |
| temporal | 1931-01-01T00:00:00+00:00/1990-01-01T00:00:00+00:00 |
| title | Long Island Sound, NY/CT (M040) Bathymetric Digital Elevation Model (30 meter resolution) Derived From Source Hydrographic Survey Soundings Collected by NOAA |
