Estuarine Bathymetric Digital Elevation Models (30 meter and 3 arc second resolution) Derived From Source Hydrographic Survey Soundings Collected by NOAA

Dataset Summary

Agency	NOAA's Ocean Service, Special Projects (SP)
Sub-Agency/Organization
Category
Date Released	19980606
Date Updated
Time Period	1839 - 1989
Frequency	Irregular
Description	These Bathymetric Digital Elevation Models (DEM) were generated from original point soundings collected during hydrographic surveys conducted by the National Ocean Service and its predecessors. Mean High Water shoreline was used as a constraining boundary and assigned its local elevation relative to the local datum (typically Mean Low Water). DEM grid values outside the shoreline (on land) were assigned null values (-32676). In the event of multiple surveys in a region, the most recent survey soundings were retained. Both 7.5 minute and 1 degree DEMs are available. The 1 degree DEMs were generated from the higher resolution 7.5 minute DEMs which covered the estuary. These DEMs are available as either Untiled (large grids) or sets of Tiled DEMs (at 7.5 degree minute size).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 {0.01 meter]) per each profile. The last physical record of the DEM is an accuracy record (C-record).The 1 degree (60-minute) DEMs (3 arc second x 3 arc second data spacing) is cast on the geographic coordinate system (no projection). It provides coverage in 1 degree square blocks. Each product contains over edge data. Coverage is available for the many estuaries of the conterminous United States, but is not complete.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.

Dataset Ratings

Current Your Rating [?] Overall ( votes) Data Utility ( votes) Usefulness ( votes) Ease of Access    ( votes) (Privacy Policy)

Dataset Metrics

Number of Downloads

0

Dataset Information

Data.gov Data Category Type	Geodata
Specialized Data Category Designation	Geospatial
Keywords	none , DEM , digital elevation model , digital bathymetric model , digital terrain model , bathymetry , altitude , height , depth , elevation , bathy , Marine Navigation , oceans , ISO 19115 Topic Category , elevation , 006 , NOS Data Explorer Topic Category , Bathymetry/Topography , None , U.S. Exclusive Economic Zone
Unique ID	5FB47560-246A-CC86-BB4D-D28C3940436F

Contributing Agency Information

Citation	Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), Special Projects (SP)
Agency Program Page
Agency Data Series Page	http://estuarinebathymetry.noaa.gov

Dataset Coverage

Unit of Analysis
Granularity
Geographic Coverage	-125.00 , -65.00 , 50.00 , 24.00

Data Description

Collection Mode
Data Collection Instrument
Data Dictionary/Variable List	The digital elevation model is composed of an elevation value linked to a grid cell location representing a gridded form of a bathymetric map overlay. Each grid cell entity contains a 6-character integer value between -32,767 and 32,768. The grid is generated from profiles of data each containing header information (profile identifier, starting point, relative datum for profile values (deepest value within the DEM), number of values, etc) followed by profile values relative to the relative datum for the profile. All non-null values in the profile are positive.

Additional Dataset Documentation

Technical Documentation
Additional Metadata	XML Format

Download Information

Geodata

 

Cannot find data you are looking for? Suggest other datasets!