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    Hi,<br>
    <br>
    Thank you a lot; it is working with Template and xdfopen; for wind
    energy, we are working on ~ 10 years of data.<br>
    <br>
    just a small problem: for 3 months (june to august;, 2010), Merra
    data have another name; that must be another run, i think.<br>
    Best regards.<br>
    Antoine<br>
    <br>
    <br>
    <br>
    Le 04/10/2011 15:49, Arlindo da Silva a &eacute;crit&nbsp;:
    <blockquote
cite="mid:CALz7xZdvp=PjDYUH33ADtwCeEgfM3+k1=gzz2Zc8G5G_+nBLJQ@mail.gmail.com"
      type="cite">On Tue, Oct 4, 2011 at 6:50 AM, Molin Antoine <span
        dir="ltr">&lt;<a moz-do-not-send="true"
          href="mailto:antoine.molin@poweo.com">antoine.molin@poweo.com</a>&gt;</span>
      wrote:<br>
      <div class="gmail_quote">
        <blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt
          0.8ex; border-left: 1px solid rgb(204, 204, 204);
          padding-left: 1ex;">
          <div text="#000000" bgcolor="#ffffff"> Hi,<br>
            <br>
            Thanks for your answer.<br>
            <br>
            I tasted your cooking, and it is good; but we would like to
            get the MERRA data at the resolution 2/3 &deg; x 0.5&deg;. <br>
            <br>
          </div>
        </blockquote>
        <div><br>
        </div>
        <div>For the record, this should not make a difference. Here is
          the lats4d syntax to bring about a week of data with these:</div>
        <div><br>
        </div>
        <div>% lats4d.sh -i <a moz-do-not-send="true"
            href="http://goldsmr2.sci.gsfc.nasa.gov:80/dods/MAT1NXSLV">http://goldsmr2.sci.gsfc.nasa.gov:80/dods/MAT1NXSLV</a>
          -vars slp u50m v50m t2m -time 0:30z01jan2001 23:30z07jan2001
          -o merra_slv -v</div>
        <div><br>
        </div>
        <div>(Notice that I used lower case "slp".) Go get a cup of
          coffee and when you come back this will create a netcdf file
          called "<a moz-do-not-send="true" href="http://merra_slv.nc">merra_slv.nc</a>";
          use the -format option to choose another format.</div>
        <div>&nbsp;</div>
        <blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt
          0.8ex; border-left: 1px solid rgb(204, 204, 204);
          padding-left: 1ex;">
          <div text="#000000" bgcolor="#ffffff"> So i downloaded the
            Merra data, hdf files, with the variables SLP, U50m, V50m
            and T2m.<br>
            <br>
          </div>
        </blockquote>
        <blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt
          0.8ex; border-left: 1px solid rgb(204, 204, 204);
          padding-left: 1ex;">
          <div text="#000000" bgcolor="#ffffff"> * the variable SLP is
            not recognized by Grads!&nbsp; </div>
        </blockquote>
        <div><br>
        </div>
        <div>The attached file does not have SLP. Please file a bug
          report with the M-DISC.</div>
        <div>&nbsp;</div>
        <blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt
          0.8ex; border-left: 1px solid rgb(204, 204, 204);
          padding-left: 1ex;">
          <div text="#000000" bgcolor="#ffffff">(the variable "SLP" is
            on the Merra site:
            <a moz-do-not-send="true"
href="http://disc.sci.gsfc.nasa.gov/daac-bin/FTPSubset.pl?LOOKUPID_List=MAT1NXSLV"
              target="_blank">http://disc.sci.gsfc.nasa.gov/daac-bin/FTPSubset.pl?LOOKUPID_List=MAT1NXSLV</a>)<br>
            <br>
            * i tried first to read a hdf file with xdfopen, but the
            written ddf (enclosed file) is not good; a
            "SDF_dimension_name" is lacking, i think, for TDEF; but how
            do you name this dimension_name? and how do you scan a hdf
            file?<br>
            <br>
          </div>
        </blockquote>
        <div><br>
        </div>
        <div>Did you create this ctl file or it came with the data? The
          attached ctl is wrong as it mixes elements of DDF and CTL.
          &nbsp;Here is a templates DDF (I did not try it):</div>
        <div>
          <br>
        </div>
        <div>
          <div>dset ^MERRA.%y4%m2%d2.SUB.hdf</div>
          <div>options template&nbsp;</div>
          <div>tdef <span class="Apple-style-span"
              style="background-color: rgb(255, 255, 0);">time</span> 24
            linear <span class="Apple-style-span"
              style="background-color: rgb(255, 255, 0);">00:30</span>Z01jan2001
            1hr</div>
        </div>
        <div><br>
        </div>
        <div>If you need a relatively short period of time, why mess
          with this? Just use lats4d as above and save yourself some
          work.</div>
        <div><br>
        </div>
        <div>&nbsp; &nbsp; Arlindo</div>
        <div><br>
        </div>
        <div><br>
        </div>
        <div>
          <br>
        </div>
        <div>&nbsp;</div>
        <blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt
          0.8ex; border-left: 1px solid rgb(204, 204, 204);
          padding-left: 1ex;">
          <div text="#000000" bgcolor="#ffffff"> Thanks, and best
            regards.<br>
            Antoine Molin<br>
            <br>
            <br>
            <br>
            <br>
            <br>
            Le 30/09/2011 22:17, Arlindo da Silva a &eacute;crit&nbsp;:
            <div>
              <div class="h5">
                <blockquote type="cite">On Fri, Sep 30, 2011 at 4:22 AM,
                  Molin Antoine <span dir="ltr">&lt;<a
                      moz-do-not-send="true"
                      href="mailto:antoine.molin@poweo.com"
                      target="_blank">antoine.molin@poweo.com</a>&gt;</span>
                  wrote:<br>
                  <div class="gmail_quote">
                    <blockquote class="gmail_quote" style="margin: 0pt
                      0pt 0pt 0.8ex; border-left: 1px solid rgb(204,
                      204, 204); padding-left: 1ex;">
                      <div text="#000000" bgcolor="#ffffff"> <br>
                        <div>Dear All,<br>
                          <br>
                          For wind energy in France, i would like to use
                          Merra data; it is in fact rather easy to get
                          daily files from the Nasa (enclosed <a
                            moz-do-not-send="true">file:hourly</a> wind
                          speeds at 50m for one day, NetCDF).<br>
                          But then?<br>
                          Could you tell me how you would:<br>
                          * aggregate the daily files: do you use
                          "template"<br>
                        </div>
                      </div>
                    </blockquote>
                    <div><br>
                    </div>
                    <div>Yes.</div>
                    <div>&nbsp;</div>
                    <blockquote class="gmail_quote" style="margin: 0pt
                      0pt 0pt 0.8ex; border-left: 1px solid rgb(204,
                      204, 204); padding-left: 1ex;">
                      <div text="#000000" bgcolor="#ffffff">
                        <div> * read the aggregate files (i think we
                          need a descriptor file and use xdfopen or open
                          under grads, isn'it?; or is it better to work
                          with HDF files?).<br>
                        </div>
                      </div>
                    </blockquote>
                    <div><br>
                    </div>
                    <div>Using a template makes it easier to work with
                      the HDF files.</div>
                    <div>&nbsp;</div>
                    <blockquote class="gmail_quote" style="margin: 0pt
                      0pt 0pt 0.8ex; border-left: 1px solid rgb(204,
                      204, 204); padding-left: 1ex;">
                      <div text="#000000" bgcolor="#ffffff">
                        <div> * best way to eventually create the
                          descriptor file<br>
                        </div>
                      </div>
                    </blockquote>
                    <div><br>
                    </div>
                    <div>Yes, it should be sufficient to create a DDF
                      file with 3 records: DSET, OPTIONS template, and
                      TDEF. Please read the User's Guide:</div>
                    <div><br>
                    </div>
                    <div>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<a moz-do-not-send="true"
                        href="http://grads.iges.org/grads/gadoc/SDFdescriptorfile.html"
                        target="_blank">http://grads.iges.org/grads/gadoc/SDFdescriptorfile.html</a></div>
                    <div><br>
                    </div>
                    <div>Now, depending on the extent of data analysis
                      you need to perform it may be practical for use to
                      access MERRA data directly through OPeNDAP. In
                      fact, we have made the whole MERRA collection
                      on-line. There are a number of recipes in the
                      Cookbook explaining how to work with MERRA data,
                      click on this link:&nbsp;<a moz-do-not-send="true"
href="http://cookbooks.opengrads.org/index.php?title=Table_of_Contents#NASA.2FGSFC_MERRA"
                        target="_blank">2.6.1 NASA/GSFC MERRA</a></div>
                    <div><br>
                    </div>
                    <div>The opengrads bundle also ships with a GUI
                      interface for browsing the MERRA datasets, see</div>
                    <div><br>
                    </div>
                    <div>&nbsp; &nbsp;<a moz-do-not-send="true"
href="http://cookbooks.opengrads.org/index.php?title=Recipe-016:_Accessing_MERRA_data_with_a_Graphical_User_Interface"
                        target="_blank">http://cookbooks.opengrads.org/index.php?title=Recipe-016:_Accessing_MERRA_data_with_a_Graphical_User_Interface</a></div>
                    <div><br>
                    </div>
                    <div>Just type "merra" on the command line; under
                      Windows you should have a MERRA icon on your
                      desktop.</div>
                    <div><br>
                    </div>
                    <div>&nbsp; &nbsp; Arlindo</div>
                    <div><br>
                    </div>
                    <div><br>
                    </div>
                    <div><br>
                    </div>
                    <div> <br>
                    </div>
                    <div><br>
                    </div>
                  </div>
                  -- <br>
                  Arlindo da Silva<br>
                  <a moz-do-not-send="true"
                    href="mailto:dasilva@alum.mit.edu" target="_blank">dasilva@alum.mit.edu</a><br>
                </blockquote>
                <br>
                <br>
              </div>
            </div>
            <div>-- <br>
              <div class="im"> <br>
                <div>-- <br>
                  <div>
                    <p class="MsoNormal"><b><span style="font-size:
                          10pt; color: rgb(88, 89, 91);">Antoine Molin</span></b></p>
                    <p class="MsoNormal"><b><span style="font-size:
                          10pt; color: rgb(88, 89, 91);"></span></b></p>
                    <p class="MsoNormal"><span style="font-size: 10pt;
                        color: rgb(120, 121, 123);"></span></p>
                    <p class="MsoNormal"><span style="font-size: 8pt;
                        color: rgb(120, 121, 123);"><img alt="EED POWEO
                          Logo"
                          src="cid:part1.01000302.03080407@poweo.com"
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                    <p class="MsoNormal"><span style="font-size: 8pt;
                        color: rgb(120, 121, 123);">16,
                        Place Cormontaigne - 59000 Lille</span></p>
                    <p class="MsoNormal"><span style="font-size: 8pt;
                        color: rgb(120, 121, 123);"></span></p>
                    <p class="MsoNormal"><span style="font-size: 8pt;
                        color: rgb(120, 121, 123);">Tel.
                        : </span><b><span style="font-size: 8pt; color:
                          rgb(120, 121, 123);">+ 33 3 20 74 04 00</span></b></p>
                    <p class="MsoNormal"><span style="font-size: 8pt;
                        color: rgb(120, 121, 123);">Fax
                        : <a moz-do-not-send="true"
                          href="tel:%2B%2033%203%2020%2074%2004%2007"
                          value="+33320740407" target="_blank">+ 33 3 20
                          74 04 07</a></span></p>
                    <p class="MsoNormal"><b><span style="font-size: 8pt;
                          color: red;"><a moz-do-not-send="true"
                            href="http://www.poweo.com/" target="_blank"><span
                              style="color: red; text-decoration: none;">poweo.com</span></a></span></b></p>
                    <p class="MsoNormal"><b><span style="font-size: 8pt;
                          color: red;"></span></b></p>
                    <p class="MsoNormal"><span style="font-size: 7.5pt;
                        color: rgb(120, 121, 123);">Avant
                        d'imprimer, pensez &agrave; l'environnement</span></p>
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              </div>
            </div>
          </div>
          <br>
          _______________________________________________<br>
          gradsusr mailing list<br>
          <a moz-do-not-send="true" href="mailto:gradsusr@gradsusr.org">gradsusr@gradsusr.org</a><br>
          <a moz-do-not-send="true"
            href="http://gradsusr.org/mailman/listinfo/gradsusr"
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          <br>
        </blockquote>
      </div>
      <br>
      <br clear="all">
      <div><br>
      </div>
      -- <br>
      Arlindo da Silva<br>
      <a moz-do-not-send="true" href="mailto:dasilva@alum.mit.edu">dasilva@alum.mit.edu</a><br>
    </blockquote>
    <br>
    <br>
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              rgb(120, 121, 123); font-family: 'ArialMT','sans-serif';">16,
Place
              Cormontaigne - 59000 Lille<o:p></o:p></span></p>
          <p class="MsoNormal"><span style="font-size: 8pt; color:
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              rgb(120, 121, 123); font-family: 'ArialMT','sans-serif';">Tel.
:
            </span><b><span style="font-size: 8pt; color: rgb(120, 121,
                123); font-family: 'Arial-BoldMT','sans-serif';">+
                33 3 20 74 04 00</span></b></p>
          <p class="MsoNormal"><span style="font-size: 8pt; color:
              rgb(120, 121, 123); font-family: 'ArialMT','sans-serif';">Fax
:
              + 33 3 20 74 04 07<o:p></o:p></span></p>
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          <p class="MsoNormal"><span style="font-size: 7.5pt; color:
              rgb(120, 121, 123); font-family: 'ArialMT','sans-serif';">Avant
d'imprimer,
              pensez &agrave; l'environnement<o:p></o:p></span></p>
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