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Jennifer<br>
thanks a lot!<br>
Cheers<br>
Adrian<br>
<pre class="moz-signature" cols="72">___________________________
Adrian Scherzinger
Stv. Leiter Wetterprognosen
Genossenschaft METEOTEST
Fabrikstrasse 14, CH-3012 Bern
Tel +41 (0)31 307 26 26
Fax +41 (0)31 307 26 10
<a class="moz-txt-link-abbreviated" href="mailto:adrian.scherzinger@meteotest.ch">adrian.scherzinger@meteotest.ch</a>
<a class="moz-txt-link-freetext" href="http://www.meteotest.ch">http://www.meteotest.ch</a>
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METEOFON - Wetterauskünfte im direkten Dialog mit dem Prognostiker
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<br>
Am 14.04.2011 16:03, schrieb Jennifer Adams:
<blockquote
cite="mid:329742D7-A6AB-482C-9A1E-53F5901BA004@cola.iges.org"
type="cite"><br>
<div>
<div>On Apr 13, 2011, at 9:25 AM, Adrian Scherzinger wrote:</div>
<br class="Apple-interchange-newline">
<blockquote type="cite">
<div>hi<br>
<br>
i have to make wind maps on a certain height above ground
with gradsdods <br>
and the nomads gfs_hd (0.5) data. To solve this, i use the
zinterp.gs <br>
function for an area which is quite big (lat 40 70, lon -15
40). The <br>
calculation of one timestep takes around 20 minutes.<br>
</div>
</blockquote>
<div>That's because you've made a large 3-D request from a GDS
of data in GRIB2 format, which takes a long time, especially
if you are using 'gradsdods', an old deprecated build, which
is not optimized for doing I/O from an opendap server. You are
doing the I/O on row by row basis, slamming the server with
small requests. zinterp.gs is not designed to work with remote
data sets. </div>
<div><br>
</div>
<br>
<blockquote type="cite">
<div>however, after one or two timesteps, the zinterp.gs
function just takes <br>
a few seconds and gradsdods just delivers "entire grid
empty" data.<br>
the same script with nomads gfs 1 degree or 2.5 degree data
is working <br>
fine for all timesteps.<br>
</div>
</blockquote>
It may be because the server has enabled a DOS after your 20
minutes of 1-row requests. The administrator of the nomads GDS
may be willing to check the logs for an explanation of why your
data requests are failing. </div>
<div><br>
</div>
<div>My suggestion: </div>
<div>1. Upgrade to the latest version of GrADS</div>
<div>2. Use a separate script to create a local data set (using
fwrite or sdfwrite) that is the subset of gfs_hd grid, only the
lat/lon/levels that you need for zinterp.gs to work. Optimize
this for hitting the server a minimum number of times, and don't
ask for more than one level per request -- that will slow down
your script. </div>
<div>3. After you have a created a local data set, then run
zinterp.gs. </div>
<div><br>
</div>
<div>--Jennifer</div>
<div><br>
</div>
<div><br>
</div>
<div><br>
</div>
<div><br>
<blockquote type="cite">
<div><br>
what is going wrong?<br>
<br>
thanks for any help<br>
adrian<br>
<br>
-- <br>
___________________________<br>
Adrian Scherzinger<br>
Stv. Leiter Wetterprognosen<br>
<br>
Genossenschaft METEOTEST<br>
Fabrikstrasse 14, CH-3012 Bern<br>
Tel +41 (0)31 307 26 26<br>
Fax +41 (0)31 307 26 10<br>
<a moz-do-not-send="true"
href="mailto:adrian.scherzinger@meteotest.ch">adrian.scherzinger@meteotest.ch</a><br>
<a class="moz-txt-link-freetext" href="http://www.meteotest.ch">http://www.meteotest.ch</a><br>
<br>
******************************************************************<br>
METEOFON - Wetterauskünfte im direkten Dialog mit dem
Prognostiker<br>
0900 57 61 52 (CHF 3.13/Min ab Festnetz) So-Fr 5-17:30, Sa
5-13:30<br>
******************************************************************<br>
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</div>
</blockquote>
</div>
<br>
<div apple-content-edited="true"> <span class="Apple-style-span"
style="border-collapse: separate; border-spacing: 0px; color:
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<div style="word-wrap: break-word;"><span
class="Apple-style-span" style="border-collapse: separate;
border-spacing: 0px; color: rgb(0, 0, 0); font-family:
Helvetica; font-size: 12px; font-style: normal;
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normal; line-height: normal; text-indent: 0px;
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; color: rgb(0, 0, 0);
font-family: Helvetica; font-size: 12px; font-style:
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text-indent: 0px; 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 moz-do-not-send="true"
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>
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