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Re: [ferret_users] use a finer coastline with go land and go fland
Hi All,
Though Temothee got a solution to his question, i think this
information will be useful to all those to interested in fine resolution
bathymetry data.
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 and if you are interested in
fine resolution bathymetry, you should read it.
Regarding the topography/coastline datasets, Etopo5 is not the finest
resolution available now (as mentioned in earlier mails). There are datasets
like GEBCO, Etopo2 and GLOBE (only land elevation) which are having
resolutions of 1 Minutes, 2 Minutes and 1 Km respectively. Here is a list of
freely available global datasets. This is only a beginning and the list is,
for sure, not complete. I hope that those who know about any other datasets
or relevant web sites will include those to the present list and make it as
a good source of information.
Please note that the ocean topography or land elevation datasets can be
used to create new coastline dataset (extracting lat & lon for zero depth/
elevation) but read the dataset documentation, especially about the data
processing, to know how reliable will be the coastline derived like this.
Please see the list below....which is extended as far as i can....
Hope this helps,
Regards,
Jaison
List of free, Global, Ocean Topography/Land Elevation/Coastline/River datasets
==============================================================================
1. ocean topography
----------------------------------------
Dataset Name : Etopo2 (Smith and Sandwell)
Resolution : 2 Minute
Source : NOAA NGDC
Data format : NetCDF
On Web : http://dss.ucar.edu/datasets/ds759.3/
http://ngdc.noaa.gov/mgg/fliers/06mgg01.html
http://www.ngdc.noaa.gov/mgg/fliers/01mgg04.html
http://ferret.pmel.noaa.gov/cgi-bin/nph-dods/data/PMEL/
smith_sandwell_topo_v8_2.nc --> dods
http://www.ferret.noaa.gov/cgi-bin/dods/nph-dods/
data/smith_sandwell_topo.nc --> dods
http://www.ngdc.noaa.gov/mgg/fliers/97mgg03.html --> poster
Dataset Name : Etopo5
Resolution : 5 Minute
Source : NOAA NGDC
Data format : NetCDF
On Web : http://dss.ucar.edu/datasets/ds759.1
http://ingrid.ldeo.columbia.edu/SOURCES/.WORLDBATH/
http://ferret.pmel.noaa.gov/cgi-bin/dods/nph-dods/data/
PMEL/etopo5.nc --> dods
Dataset Name : General Bathymetric Chart of the Oceans (GEBCO)
Resolution : 1 Minute
Source : BODC
Data Format : NetCDF (274 MB zip file)
On Web : http://www.bodc.ac.uk/data/online_delivery/gebco/
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
2. land elevation
-----------------
Dataset Name : GLOBE
Resolution : 1 Km, Gridded
Source : NOAA NGDC
Data format : NetCDF
On web : http://iridl.ldeo.columbia.edu/SOURCES/.NOAA/.NGDC/.GLOBE/
http://www.ngdc.noaa.gov/mgg/topo/globe.html
Note : Etopo2 and Etopo5 (see above) also have land elevation.
3. 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 Web : http://ocean-ridge.ldeo.columbia.edu/database/html/home.html
http://www.marine-geo.org/geomapapp/about.html
4. coastline/shoreline data
---------------------------
Dataset Names: 4a) NOAA/NOS Medium resolution coastline, 1:70,000
4b) World Vector Shoreline, 1:250,000
4c) World Data Bank II, 1:2,000,000
4d) World Coast Line, 1:5,000,000
Resolution : .....
Data Format : ASCII
Source : NOAA NGDC
On Web : http://rimmer.ngdc.noaa.gov/mgg/coast/getcoast.html
http://www.ngdc.noaa.gov/mgg/shorelines/shorelines.html (home)
Note : Ferret does have a really nice FAQ about "Detailed Coastlines
and Borders" at
http://www.ferret.noaa.gov/Ferret/FAQ/graphics/coastlines.html";
which describes how to use the dataset from this source for
drawing borders in Ferret.
5. Political/International/Internal boundaries
----------------------------------------------
Dataset Names: 5a) World Data Bank II Political boundaries
5b) World Data Bank II International Boundaries
5c) World Data Bank II Internal Boundaries
5d) World Vector Shoreline & All political boundaries
Resolution : .....
Data Format : ASCII
Source : NOAA NGDC
On Web : http://rimmer.ngdc.noaa.gov/mgg/coast/getcoast.html
http://www.ngdc.noaa.gov/mgg/shorelines/shorelines.html (home)
6. Rivers
----------
Dataset Name : World Data Bank II Rivers
Resolution : .....
Data Format : ASCII
Source : NOAA NGDC
On Web : http://rimmer.ngdc.noaa.gov/mgg/coast/getcoast.html
http://www.ngdc.noaa.gov/mgg/shorelines/shorelines.html (home)
7. Where to Look for more informations?
---------------------------------------
http://dss.ucar.edu/catalogs/list_auto/topo.html
http://www.gfdl.noaa.gov/products/vis/data/datasets/index.html
http://ioc.unesco.org/oceanteacher/OceanTeacher2/06_OcDtaMgtProc/
05_DtaAnal&Prods/08_SelectProds/SelAnalProds.htm
http://www.vterrain.org/Elevation/Bathy/index.html
http://topex.ucsd.edu/marine_topo/text/topo.html
You can also check :
http://topex.ucsd.edu/WWW_html/srtm30_plus.html
http://fermi.jhuapl.edu/abyss/documents/HOTSWG3.3.pdf
http://www.gcc.ntu.edu.tw/modelsplanning/database/gcrc_databank/
datamanage/DISasia/igbp-dis/activity_summary/summary_act1_8.html
8. 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 Web : http://www.shadedrelief.com/cleantopo2/
General Notes about sites listed above
--------------------------------------
a) With dss.ucar & bodc.ac.uk you have to create an account (it is free) in
order to download datasets. While creating account with bodc.ac.uk,
keep the final page where the verification code is to be pasted as it
is, and wait for a mail from bodc. Once you get the mail copy and paste
the verification code on the box provided.
b) Citations for above datasets are available/mentioned in the respective
web pages.
c) Links which marked as "--> dods" can be accessed via DODS, using Ferret.
================================================================================
On Mon, 20 Nov 2006, Ansley Manke wrote:
> Both the etopo05 and the Smith and Sandwell topography dataset are
> available from the PMEL OPeNDAP server. Use them in Ferret with the
> commands:
>
> use
> "http://ferret.pmel.noaa.gov/cgi-bin/nph-dods/data/PMEL/smith_sandwell_topo_v8_2.nc";
>
> Or,
>
> use
> "http://ferret.pmel.noaa.gov/cgi-bin/dods/nph-dods/data/PMEL/etopo5.nc";
>
> I was able to double-check the addresses by searching the OPeNDAP list
> of data under the "OPeNDAP Datasets
> <http://www.opendap.org/data/datasets.cgi?xmlfilename=datasets.xml&exfunction=none>"
> link at http://www.opendap.org/data/
>
> To substitute the Smith-Sandwell data set for the ETOPO datasets in
> fland.jnl, you would need to make your own copy of fland.jnl and edit
> it. These datasets are too large in general to use for plots the whole
> globe (the screen or plot image wouldn't have that much resolution
> anyway), or for large regions, but they're great for seeing the details
> of small regions.
>
> Ansley
>
> william s. kessler wrote:
> > The 5-minute etopo dataset is called etopo05 (note the zero).
> >
> > There is a 2-minute topography dataset from Smith and Sandwell (1994
> > JGR 99(B11) 21803-21824), which should be available somewhere (for
> > free?). That is as good as exists today, I think.
> >
> > Billy K
> >
> > On 20Nov 2006, at 6:56 AM, Timothée Brochier wrote:
> >
> >> Hello ferreters,
> >>
> >> The standart go land has a poor resolution at my scale, and the go
> >> fland is even worse
> >>
> >> I tried go land 5 but it says I don't have etopo5 and didn't manage
> >> to install it (I think we have to pay for it?)
> >> BUT I could download a .dat file from the coastal extractor, wich
> >> contain the coastline at a very fine resolution.
> >> Is it possible to use the go fland method with that data?
> >>
> >> many Thanks,
> >>
> >> Timothée
> >> Mensaje no contiene virus y
> >> otros contenidos peligrosos.
> >> MailScanner agradece su apoyo.
> >>
> >>
> >
> >
>
>
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