How to get bathymetry data using R
Use the ?rerddap? package that accesses our ERDDAP server. You can see the data available at: http://upwell.pfeg.noaa.gov/erddap In the search box type in ?bathymetry?. You can subset as you want, using ?rerddap? you get back a netcdf file that is already read into your R workspace, or you can write your own 2 lines of code (since the URL completely defines the request) and get the data back in any number of file formats. I don?t want to get into a format war, but for large gridded datasets like this I much prefer netcdf files. If you have any questions at all about either the ?rerddap? package (developed by the wonderful people at ROpenSci) or about our ERDDAP service, don?t hesitate to ask. -Roy
On Jun 11, 2016, at 12:30 AM, Michael Sumner <mdsumner at gmail.com> wrote: On Sat, 11 Jun 2016 at 15:43 javad bayat <j.bayat194 at gmail.com> wrote:
Dear R users; I am searching for a package to extract bathymetry data from topography map to produce the control file for CE-Qual-w2 model. Is there anyone to know how to do it? many thanks.
There are few things around but I highly recommend find your own data source, suitable for your purpose - and reading it directly with the raster package. If anyone knows a reliable source I'd like to hear it. As a global go-to I use Etopo1, but you may want some more detailed (like Gebco 2014) or a non-global one. (I can't tell where you need this for or what resolution would be suitable from what you've asked though). (The best format when you get a choice generally is GeoTIFF, but it depends who creates them. I tend to use the NetCDF files from Etopo). Raster uses rgdal for many formats, but ncdf4 exclusively for NetCDF - if it's not called "*.nc" you can get around that). Cheers, Mike.
--
Best Regards
Javad Bayat
M.Sc. Environment Engineering
Alternative Mail: bayat194 at yahoo.com
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********************** "The contents of this message do not reflect any position of the U.S. Government or NOAA." ********************** Roy Mendelssohn Supervisory Operations Research Analyst NOAA/NMFS Environmental Research Division Southwest Fisheries Science Center ***Note new address and phone*** 110 Shaffer Road Santa Cruz, CA 95060 Phone: (831)-420-3666 Fax: (831) 420-3980 e-mail: Roy.Mendelssohn at noaa.gov www: http://www.pfeg.noaa.gov/ "Old age and treachery will overcome youth and skill." "From those who have been given much, much will be expected" "the arc of the moral universe is long, but it bends toward justice" -MLK Jr.