<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Hi, Nick -- <div>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. </div><div>--Jennifer</div><div><br></div><div><br><div><div>On Dec 21, 2010, at 10:29 AM, Nick Heath wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div>Hi everyone,<br><br>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)?<br><br>Here is the config of the Grads I'm using:<br><br>Config: v2.0.a8 little-endian readline printim grib2 netcdf hdf4-sds hdf5 opendap-grids,stn geotiff shapefile<br>Grid Analysis and Display System (GrADS) Version 2.0.a8<br>Copyright (c) 1988-2010 by Brian Doty and the<br>Institute for Global Environment and Society (IGES) <br>This program is distributed WITHOUT ANY WARRANTY <br>See file COPYRIGHT for more information. <br><br>Built Fri Mar 26 10:24:10 EDT 2010 for x86_64-unknown-linux-gnu<br><br>This version of GrADS has been configured with the following options:<br> o Built on a LITTLE ENDIAN machine<br> o Athena Widget GUI DISABLED<br> o Command line editing ENABLED <br> <a href="http://tiswww.case.edu/php/chet/readline/rltop.html">http://tiswww.case.edu/php/chet/readline/rltop.html</a> <br> o printim command for image output ENABLED <br> <a href="http://www.zlib.net">http://www.zlib.net</a> <br> <a href="http://www.libpng.org/pub/png/libpng.html">http://www.libpng.org/pub/png/libpng.html</a> <br> <a href="http://www.libgd.org/Main_Page">http://www.libgd.org/Main_Page</a> <br> o GRIB2 interface ENABLED <br> <a href="http://www.ijg.org">http://www.ijg.org</a> <br> <a href="http://www.ece.uvic.ca/~mdadams/jasper">http://www.ece.uvic.ca/~mdadams/jasper</a> <br> <a href="http://www.nco.ncep.noaa.gov/pmb/codes/GRIB2">http://www.nco.ncep.noaa.gov/pmb/codes/GRIB2</a> <br> g2clib-1.1.8 <br> o NetCDF interface ENABLED <br> <a href="http://www.unidata.ucar.edu/software/netcdf">http://www.unidata.ucar.edu/software/netcdf</a> <br> netcdf 4.1.1-rc2 of Mar 23 2010 09:31:58 $ <br> o OPeNDAP gridded data interface ENABLED<br> o OPeNDAP station data interface ENABLED<br> <a href="http://iges.org/grads/gadoc/supplibs.html">http://iges.org/grads/gadoc/supplibs.html</a> <br> libgadap 2.0 <br> o HDF4 and HDF5 interfaces ENABLED <br> <a href="http://hdfgroup.org">http://hdfgroup.org</a> <br> HDF 4.2r3 <br> HDF5 1.8.4 <br> o GeoTIFF and KML output ENABLED<br> <a href="http://www.libtiff.org">http://www.libtiff.org</a> <br> <a href="http://geotiff.osgeo.org">http://geotiff.osgeo.org</a> <br> o Shapefile interface ENABLED<br> <a href="http://shapelib.maptools.org">http://shapelib.maptools.org</a><br><br>Thanks for the help!<br><br>Nick<br>_______________________________________________<br>gradsusr mailing list<br><a href="mailto:gradsusr@gradsusr.org">gradsusr@gradsusr.org</a><br>http://gradsusr.org/mailman/listinfo/gradsusr<br></div></blockquote></div><br><div apple-content-edited="true"> <span class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-align: auto; -khtml-text-decorations-in-effect: none; text-indent: 0px; -apple-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><div style="word-wrap: break-word; -khtml-nbsp-mode: space; -khtml-line-break: after-white-space; "><span class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-align: auto; -khtml-text-decorations-in-effect: none; text-indent: 0px; -apple-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><span class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-align: auto; -khtml-text-decorations-in-effect: none; text-indent: 0px; -apple-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><div>--</div><div>Jennifer M. Adams</div><div>IGES/COLA</div><div>4041 Powder Mill Road, Suite 302</div><div>Calverton, MD 20705</div><div><a href="mailto:jma@cola.iges.org">jma@cola.iges.org</a></div><div><br class="khtml-block-placeholder"></div><br class="Apple-interchange-newline"></span></span></div></span> </div><br></div></body></html>