[gradsusr] Geotiffs in Grads

Tue Dec 21 22:44:15 EST 2010

Hi,

Thanks for the information.  I have attached the geotiff file that I used to create the ASCII grid format along with the world file that accompanied it.  Thank you all again for the help.

-Nick

----- Original Message -----
From: Yaqiang Wang <yaqiang.wang at gmail.com>
Date: Tuesday, December 21, 2010 7:37 pm
Subject: Re: [gradsusr] Geotiffs in Grads
To: GrADS Users Forum <gradsusr at gradsusr.org>

> Hi Nick,
> 
> I have checked your data. "20100424_160000.asc" is ESRI ASCII Grid
> format data which could be supported in many GIS software. The problem
> is I don't know the projection information of the data which is not
> longitude/latitude coordinate, and the ESRI ASCII Grid format has no
> information of the projection. The projection information should has
> been included in the geotiff file.
> 
> On Wed, Dec 22, 2010 at 3:54 AM, Nick Heath <nkh09 at fsu.edu> wrote:
> > 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
> >>
> >>
> >>
> >>
> >
> > _______________________________________________
> > gradsusr mailing list
> > gradsusr at gradsusr.org
> > http://gradsusr.org/mailman/listinfo/gradsusr
> >
> >
> 
> 
> 
> -- 
> *************************************************
> Dr. Ya-Qiang Wang
> Centre for Atmosphere Watch and Services (CAWAS), CMA
> Chinese Academy of Meteorological Sciences (CAMS)
> 46, Zhong-Guan-Cun South Avenue
> Beijing, 100081
> China
> 
> yaqiang.wang at gmail.com
> **************************************************
> 
> _______________________________________________
> gradsusr mailing list
> gradsusr at gradsusr.org
> http://gradsusr.org/mailman/listinfo/gradsusr
> 
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