[gradsusr] Geotiffs in Grads

[Nick Heath]

Hi,

Thank you both for the help!  I have found a way to convert the geotiffs into gridded data.  I have attached 2 of the output files after the conversion (I tried two different formats).  Now, I am a bit lost on how to make a control file with this data as I am used to working with Grib or netcdf.  Maybe someone could help?  In the .dat file, I believe the 3 columns are Y,X, and either 0 (no oil) or 16777215 for oil.  I am not sure why the converter picked that number.  Thanks an advance for the help!

-Nick

----- Original Message -----
From: Jennifer Adams <jma at cola.iges.org>
Date: Tuesday, December 21, 2010 10:48 am
Subject: Re: [gradsusr] Geotiffs in Grads
To: GrADS Users Forum <gradsusr at gradsusr.org>

> Hi, Nick --
> What you are asking for is a 'dtype geotiff' which does not exist 
> in  
> GrADS. Turning the information in a geotiff file into a grid of 
> values  
> that you can analyze with GrADS is a job for customized stand-alone 
> 
> code. You may find some useful utilities to help you get started in 
> 
> the libgeotiff distribution.
> --Jennifer
> 
> 
> On Dec 21, 2010, at 10:29 AM, Nick Heath wrote:
> 
> > Hi everyone,
> >
> > I am working with oil spill data, and I need a way to display the 
> 
> > oil in my model.  I have geotiffs of the oil locations and I was  
> > wondering if there is any way to read those into Grads.  I also 
> have  
> > the locations in .gif files.  If that is not possible, does 
> anyone  
> > have any good ideas of how I could make a "blob" of oil that I 
> could  
> > apply equations to (such as a wind drift to watch how it moved  
> > through time)?
> >
> > Here is the config of the Grads I'm using:
> >
> > Config: v2.0.a8 little-endian readline printim grib2 netcdf hdf4-
> sds  
> > hdf5 opendap-grids,stn geotiff shapefile
> > Grid Analysis and Display System (GrADS) Version 2.0.a8
> > Copyright (c) 1988-2010 by Brian Doty and the
> > Institute for Global Environment and Society (IGES)
> > This program is distributed WITHOUT ANY WARRANTY
> > See file COPYRIGHT for more information.
> >
> > Built Fri Mar 26 10:24:10 EDT 2010 for x86_64-unknown-linux-gnu
> >
> > This version of GrADS has been configured with the following 
> options:>  o Built on a LITTLE ENDIAN machine
> >  o Athena Widget GUI DISABLED
> >  o Command line editing ENABLED
> >      http://tiswww.case.edu/php/chet/readline/rltop.html
> >  o printim command for image output ENABLED
> >      http://www.zlib.net
> >      http://www.libpng.org/pub/png/libpng.html
> >      http://www.libgd.org/Main_Page
> >  o GRIB2 interface ENABLED
> >      http://www.ijg.org
> >      http://www.ece.uvic.ca/~mdadams/jasper
> >      http://www.nco.ncep.noaa.gov/pmb/codes/GRIB2
> >      g2clib-1.1.8
> >  o NetCDF interface ENABLED
> >      http://www.unidata.ucar.edu/software/netcdf
> >      netcdf 4.1.1-rc2 of Mar 23 2010 09:31:58 $
> >  o OPeNDAP gridded data interface ENABLED
> >  o OPeNDAP station data interface ENABLED
> >      http://iges.org/grads/gadoc/supplibs.html
> >      libgadap 2.0
> >  o HDF4 and HDF5 interfaces ENABLED
> >      http://hdfgroup.org
> >      HDF 4.2r3
> >      HDF5 1.8.4
> >  o GeoTIFF and KML output ENABLED
> >      http://www.libtiff.org
> >      http://geotiff.osgeo.org
> >  o Shapefile interface ENABLED
> >      http://shapelib.maptools.org
> >
> > Thanks for the help!
> >
> > Nick
> > _______________________________________________
> > gradsusr mailing list
> > gradsusr at gradsusr.org
> > http://gradsusr.org/mailman/listinfo/gradsusr
> 
> --
> Jennifer M. Adams
> IGES/COLA
> 4041 Powder Mill Road, Suite 302
> Calverton, MD 20705
> jma at cola.iges.org
> 
> 
> 
> 
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