<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">You should be using the 'gradsdap' executable to access OPeNDAP servers. I am able to open one of these data sets with sdfopen. Beware that there are many more coordinate variables than the usual set, and to see all the variables you will need to use xdfopen or open with a descriptor file to map the following to X, Y, Z, T, and E:<div><br></div><div><div>netcdf gfs_4_20090109_1800_171 { // format variant: 64bit </div><div>dimensions:</div><div> time1 = 1 ;</div><div> pressure1 = 1 ;</div><div> lat = 361 ;</div><div> lon = 720 ;</div><div> pressure = 26 ;</div><div> time = 1 ;</div><div> pressure3 = 21 ;</div><div> pressure_difference_layer1 = 1 ;</div><div> pressure4 = 2 ;</div><div> potential_vorticity_surface = 2 ;</div><div> height_above_ground1 = 1 ;</div><div> pressure2 = 6 ;</div><div> pressure_difference_layer = 1 ;</div><div> depth_below_surface_layer = 4 ;</div><div> altitude_above_msl = 3 ;</div><div> height_above_ground = 1 ;</div><div> bounds_dim = 2 ;</div><div><br></div><div><br><div><div>On Jan 11, 2009, at 5:59 AM, James Burn wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div>Hi<br><br>I'm wondering if it is possible to use Grads 2.0 to access data via an<br>Opendap server such as<br><a href="http://nomads.ncdc.noaa.gov/thredds/catalog/gfs4/catalog.html">http://nomads.ncdc.noaa.gov/thredds/catalog/gfs4/catalog.html</a><br><br>I've not seen any mention of Thredds here on the Grads list so am guessing<br>its not the done thing. I've Windows XP here and Opensuse Linux at home.<br><br>When I try to sdfopen one of the Grib2 files eg<br>http://nomads.ncdc.noaa.gov/thredds/dodsC/gfs4/200901/20090108/gfs_4_2009010<br>8_1800_171.grb2<br><br>I get gaopnc error and "Can't ingest SDF Metadata".<br><br>I've also tried making the appropriate .inv and .idx files locally and<br>opening a local .ctl file which seems more promising, but seems to fall<br>over when accessing the binary file via http.<br><br>Is what I am trying to do possible? Or is data access limited to dods and<br>local servers? My feeling is that I'm missing a trick or two.<br><br>This is my first post, although I've been hacking together scripts for a<br>year now and would like to thank all those who contribute to this list for<br>the tips I've picked up so far!<br><br>Thanks<br>James Burn<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></div></body></html>