<br><br><div class="gmail_quote">On Mon, Nov 2, 2009 at 1:45 PM, Jennifer Adams <span dir="ltr"><<a href="mailto:jma@cola.iges.org">jma@cola.iges.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div style="word-wrap:break-word">I have not released a version of GrADS that will read netcdf-4. I am in the process of testing netcdf-4 with GrADS -- the OPeNDAP interface doesn't yet work with sdfopen, and there are are some significant performance issues when reading compressed NetCDF files that have yet to be resolved. For netcdf-3, or for uncompressed netcdf-4, the performance is fine.If you need to serve netcdf-4 with GDS, you can try Arlindo's opengrads builds.</div>
</blockquote><div><br></div><div>We have been serving NetCDF-4 data for some time now with the OpenGrADS builds, see for example:</div><div><br></div><div> <a href="http://opendap.nccs.nasa.gov:9090/dods/GEOS-5/yotc/0.25_deg/assim">http://opendap.nccs.nasa.gov:9090/dods/GEOS-5/yotc/0.25_deg/assim</a></div>
<div><br></div><div>If you are using GDS-2 you want to download the OpenGrADS Bundle v2.0.a7.oga.3:</div><div><br></div><div> <a href="http://sourceforge.net/projects/opengrads/files/grads2/2.0.a7.oga.3/">http://sourceforge.net/projects/opengrads/files/grads2/2.0.a7.oga.3/</a></div>
<div><br></div><div>If you are using GDS-1 you want to download v1.10.r2.oga:</div></div><div><br></div><div> <a href="http://sourceforge.net/projects/opengrads/files/grads1/1.10.r2/">http://sourceforge.net/projects/opengrads/files/grads1/1.10.r2/</a></div>
<div><br></div><div>Both versions support NetCDF-4.</div><div><br></div><div>A word of caution regarding NetCDF-4 compression. Make sure you specify the chuncking size, say, to be a 2D slice of data. Depending on the NetCDF-4 version, the default chunking size may lead to very poor performance during reading. The recently released LATS extension chooses the chunking size this way.</div>
<div><br></div><div> Arlindo</div><div><br></div><div><br></div><br clear="all"><br>-- <br>Arlindo da Silva<br><a href="mailto:dasilva@alum.mit.edu">dasilva@alum.mit.edu</a><br>