Raritan Bay, NJ/NY (M060R) Bathymetric Digital Elevation Model (30 meter resolution) Derived From Source Hydrographic Survey Soundings Collected by NOAA
NEW - the following surveys were added because they represent more recent data than
those formerly in the same geographic location. They are FE0239 (1979) and H07841
(1950). Bathymetry for Raritan Bay was derived from twenty- five surveys containing
230,575 soundings. Seventeen overlapping, older, less accurate surveys were entirely
omitted, and the overlap from one older, less accurate survey was omitted before tinning
the data. The average separation between soundings was 44 meters. The twenty-five
surveys used dated from 1927 to 1988. The survey from 1927 was located in the southeast.
The eight surveys from 1934 to 1936 were located in the extreme east and west. The
remaining surveys dated from 1950 to 1988. The total range of sounding data was 1.9
meters to - 33.7 meters at mean low water. Mean high water values between 0.8 and
1.8 meters were assigned to the shoreline. Sixteen 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). Raritan
Bay has seventeen 7.5 minute DEMs and two 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.
Cite this dataset when used as a source.
- ID not available.
gov.noaa.ngdc.mgg.dem:raritan_bay_m060r_30m
Search Data |
|
Download Data |
|
Distribution Formats |
|
Distributor | DEM Information NOAA National Centers for Environmental Information dem.info@noaa.gov |
Dataset Point of Contact | DEM Information NOAA National Centers for Environmental Information dem.info@noaa.gov |
Time Period | 1927-01-01 to 1988-01-01 |
Spatial Reference System | urn:ogc:def:crs:EPSG::586626918 |
Spatial Bounding Box Coordinates |
West:-74.443629
East:-73.74295
South:40.308306
North:40.708835
|
Spatial Coverage Map |
General Documentation |
|
Associated Resources |
|
Publication Dates |
|
Edition | First |
Data Presentation Form | mapDigital |
Dataset Progress Status | Complete - production of the data has been completed |
Data Update Frequency | Irregular |
Supplemental Information |
The datum for these bathymetric DEMs is not the same as that used by the United States
Geological Survey (USGS) for land based DEMs which results in a discontinuity if the
two datasets are merged together. Moreover, the shoreline for the USGS DEMs is indeterminate
and not the same as that used for the Bathymetric DEMs. Because of these differences,
extreme care should be used in merging NOAA and USGS DEM data. 7.5-minute DEMs have
rows and columns which vary in length and are staggered. The UTM bounding coordinates
form a quadrilateral (no two sides are parallel to each other), rather than a rectangle.
The user will need to pad out the uneven rows and columns with blanks or flagged data
values, if a rectangle is required for the user's application. Some software vendors
have incorporated this function into their software for input of standard formatted
USGS DEMs. The data within the bathymetry file is floating point. When using the data
within a GIS care must be taken to ensure that the data are being read as floating
point and not integer data.
|
Purpose | Bathymetric DEM's can be used as layers in Geographic Information Systems (GIS) for earth science analysis. DEM's can also serve as tools for volumetric analysis, for site location of structures, or for drainage basin delineation. The source soundings are collected by the NOS Office of Coast Survey (OCS). |
Use Limitations |
|
Originators |
|
Publishers |
|
Theme keywords | Global Change Master Directory (GCMD) Science Keywords
|
Place keywords | None
|
Data Resolution keywords | Global Change Master Directory (GCMD) Horizontal Data Resolution Keywords
|
Use Constraints | No constraint information available |
Access Constraints |
|
Fees | Fee information not available. |
Processor |
|
Processing Steps |
|
Source Datasets |
|
Last Modified: 2018-06-11
For questions about the information on this page, please email:dem.info@noaa.gov