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Available High-Resolution Topography and Bathymetry Data Sets
What data are available, and where can background information be found about the data processing?
Jaison Kruian contributed this note about data sources and an article discussing available data. (November 2006)
There is a recent article in Marine Geophysical Researches, by Marks and
Smith on "An Evaluation of Publicly Available Global Bathymetry Grids"
(see http://springerlink.metapress.com/content/w86v85v5u66g3841/?p=e22bda9684ef4291a7373478dba4b34b&pi=2) (Volume 27, Number 1, 2006,
DOI 10.1007/s11001-005-2095-4) which talks about Etopo2, GEBCO and few
other datasets. This is an excellent article to read if you are interested in
fine resolution bathymetry. Understanding how data is processed and put onto grids
is important when choosing which data set to use.
Regarding the topography/coastline datasets, a number of high-resolution
datastes are available. There are datasets like GEBCO, Etopo2 and GLOBE (only
land elevation) which have resolutions of 1 Minutes, 2 Minutes and 1 Km
respectively. Here is a list of freely available global datasets. As others
become available, or if readers know of further sources, you are urged to contact
the Ferret developers with that information at the Ferret
"Contact Us" link.
Please note that the ocean topography or land elevation datasets can be
used to create new coastline datasets (extracting lat & lon for zero depth/
elevation) but read the dataset documentation, especially about the data
processing, to determine how reliable coastline data will be when derived like this.
List of free, Global, Ocean Topography/Land Elevation/Coastline/River datasets
Ocean Topography
-
- Dataset Name: Smith and Sandwell and Etopo2
- Resolution: 2 Minute
- Source: NOAA NGDC
- Data format: NetCDF
- On the Web
- Dataset Name: Etopo5
- Resolution: 5 Minute
- Source: NOAA NGDC
- Data format: NetCDF
- On the Web
- Dataset Name: General Bathymetric Chart of the Oceans (GEBCO)
- Resolution: 1 Minute
- Source: BODC
- Data Format: NetCDF (274 MB zip file)
- On the Web
- Note: Though this dataset is 1 Minute resolution, it misses
features which the lower-resolution ETOPO2 captures,
due to over smoothing. See the following link for a comparison:
http://www.vterrain.org/Elevation/Bathy/bathy_comp.html
Land Elevation
-
- Dataset Name: GLOBE
- Resolution: 1 Km, Gridded
- Source: NOAA NGDC
- Data format: NetCDF
- On the Web
- Note: Etopo2 and Etopo5 (see above) also have land elevation.
Ridge Bathymetry
-
- Dataset Name: Ridgembs Relational Database
- Resolution: Variable, can be as high as 50 m where data exists.
No global coverage (wherever data is not available, Etopo2 is used as a regional background map).
- Source: Lamont-Doherty Earth Observatory (together with RIDGE & NSF)
- Data Format: NetCDF/ASCII
- On the Web
Coastline/Shoreline Data
- Dataset Names:
- NOAA/NOS Medium resolution coastline, 1:70,000
- World Vector Shoreline, 1:250,000
- World Data Bank II, 1:2,000,000
- World Coast Line, 1:5,000,000
- Resolution: .....
- Data Format: ASCII
- Source: NOAA NGDC
- On the Web
- Note: There is a Ferret FAQ about "Detailed Coastlines and Borders" at http://ferret.pmel.noaa.gov/Ferret/FAQ/graphics/coastlines.html
which describes how to use the data from this source for drawing borders in Ferret.
Political/International/Internal Boundaries
- Dataset Names:
- World Data Bank II Political boundaries
- World Data Bank II International Boundaries
- World Data Bank II Internal Boundaries
- World Vector Shoreline & All political boundaries
- Resolution: .....
- Data Format: ASCII
- Source: NOAA NGDC
- On the Web:
Rivers
-
- Dataset Name: World Data Bank II Rivers
- Resolution: .....
- Data Format: ASCII
- Source: NOAA NGDC
- On the Web
- Note: Again see the Ferret FAQ about "Detailed Coastlines and Borders" at
http://ferret.pmel.noaa.gov/Ferret/FAQ/graphics/coastlines.html
which describes how to use the data from this source for drawing rivers in Ferret.
Where to Look for more information?
-
You can also check:
More about Etopo2
-
- CleanTOPO2: CleanTOPO2 is a touched up and generalized version of SRTM30
Plus, a public domain dataset that combines sea floor and land
elevation data of the entire world.
On the Web: http://www.shadedrelief.com/cleantopo
General Notes about sites listed above