<html>
  <head>
    <meta content="text/html; charset=windows-1252"
      http-equiv="Content-Type">
  </head>
  <body bgcolor="#FFFFFF" text="#000000">
    <p>Hi Evan,<br>
    </p>
    <p>The data model in Ferret does not allow for overlapping bounds,
      nor does it allow non-contiguous bounds.  Those are legal in CF,
      but Ferret (as I imagine is the case for most software), does not
      implement everything in the standard. <br>
    </p>
    <p>In fact Ferret will not make use of your bounds definition; I
      believe it will have ignored the bounds and will instead have
      defined the grid-cell edges using the midpoints between axes.  Use
      the command,</p>
    <p>   show axis/z axis_name</p>
    <p>to see what Ferret has done to set up its the internal
      representation of the axis.</p>
    <p>-Ansley<br>
    </p>
    <br>
    <div class="moz-cite-prefix">On 3/3/2017 7:32 AM, Manning, Evan M
      (398B) wrote:<br>
    </div>
    <blockquote
      cite="mid:4F704D1D-2801-406F-A252-B80357B6F16F@jpl.nasa.gov"
      type="cite">
      <meta http-equiv="Content-Type" content="text/html;
        charset=windows-1252">
      <meta name="Title" content="">
      <meta name="Keywords" content="">
      <meta name="Generator" content="Microsoft Word 15 (filtered
        medium)">
      <!--[if !mso]><style>v\:* {behavior:url(#default#VML);}
o\:* {behavior:url(#default#VML);}
w\:* {behavior:url(#default#VML);}
.shape {behavior:url(#default#VML);}
</style><![endif]-->
      <style><!--
/* Font Definitions */
@font-face
        {font-family:Arial;
        panose-1:2 11 6 4 2 2 2 2 2 4;}
@font-face
        {font-family:"Courier New";
        panose-1:2 7 3 9 2 2 5 2 4 4;}
@font-face
        {font-family:Times;
        panose-1:2 0 5 0 0 0 0 0 0 0;}
@font-face
        {font-family:"Cambria Math";
        panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
        {font-family:Calibri;
        panose-1:2 15 5 2 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
        {margin:0in;
        margin-bottom:.0001pt;
        font-size:12.0pt;
        font-family:Calibri;}
a:link, span.MsoHyperlink
        {mso-style-priority:99;
        color:#0563C1;
        text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
        {mso-style-priority:99;
        color:#954F72;
        text-decoration:underline;}
p
        {mso-style-priority:99;
        mso-margin-top-alt:auto;
        margin-right:0in;
        mso-margin-bottom-alt:auto;
        margin-left:0in;
        font-size:12.0pt;
        font-family:"Times New Roman";}
pre
        {mso-style-priority:99;
        mso-style-link:"HTML Preformatted Char";
        margin:0in;
        margin-bottom:.0001pt;
        font-size:10.0pt;
        font-family:"Courier New";}
span.EmailStyle18
        {mso-style-type:personal;
        font-family:Calibri;
        color:windowtext;}
span.HTMLPreformattedChar
        {mso-style-name:"HTML Preformatted Char";
        mso-style-priority:99;
        mso-style-link:"HTML Preformatted";
        font-family:Courier;}
span.apple-style-span
        {mso-style-name:apple-style-span;}
span.EmailStyle22
        {mso-style-type:personal-reply;
        font-family:Calibri;
        color:windowtext;}
span.msoIns
        {mso-style-type:export-only;
        mso-style-name:"";
        text-decoration:underline;
        color:teal;}
.MsoChpDefault
        {mso-style-type:export-only;
        font-size:10.0pt;}
@page WordSection1
        {size:8.5in 11.0in;
        margin:1.0in 1.0in 1.0in 1.0in;}
div.WordSection1
        {page:WordSection1;}
--></style>
      <div class="WordSection1">
        <p class="MsoNormal"><span style="font-size:11.0pt">When I was
            researching  the topic I came across this:<o:p></o:p></span></p>
        <p class="MsoNormal" style="margin-left:.5in"><span
            style="font-size:11.0pt">><i> When I try and load the
              file using Ferret, this throws a warning.. Which<o:p></o:p></i></span></p>
        <p class="MsoNormal" style="margin-left:.5in"><span
            style="font-size:11.0pt">><i> makes me think I¹m not
              doing things correctly:<o:p></o:p></i></span></p>
        <p class="MsoNormal" style="margin-left:.5in"><span
            style="font-size:11.0pt">><i><o:p> </o:p></i></span></p>
        <p class="MsoNormal" style="margin-left:.5in"><span
            style="font-size:11.0pt">><i> Ferret v6.93<o:p></o:p></i></span></p>
        <p class="MsoNormal" style="margin-left:.5in"><span
            style="font-size:11.0pt">><i> yes? use file.nc<o:p></o:p></i></span></p>
        <p class="MsoNormal" style="margin-left:.5in"><span
            style="font-size:11.0pt">><i>   *** NOTE: Axis definition
              error on axis: time. Bounds describe cells that<o:p></o:p></i></span></p>
        <p class="MsoNormal" style="margin-left:.5in"><span
            style="font-size:11.0pt">><i> overlap one another</i><o:p></o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt">which made
            me think that overlap was an error.  But reading more
            context I see it is just a “note”, not an “error”, and
            clearly overlapping bounds are accepted.<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt">For my
            situation of overlapping vertical trapezoids, I now think I
            should use the full overlapping extent in the “bounds”
            variable and explain the full shape of the trapezoids in the
            main variable’s description attribute.<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt">Is there a
            better way to communicate the full situation?<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt">  -- Evan<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
        <div style="border:none;border-top:solid #B5C4DF
          1.0pt;padding:3.0pt 0in 0in 0in">
          <p class="MsoNormal"><b><span style="color:black">From: </span></b><span
              style="color:black">Jim Biard <a class="moz-txt-link-rfc2396E" href="mailto:jbiard@cicsnc.org"><jbiard@cicsnc.org></a><br>
              <b>Date: </b>Friday, March 3, 2017 at 5:09 AM<br>
              <b>To: </b><a class="moz-txt-link-rfc2396E" href="mailto:cf-metadata@cgd.ucar.edu"><cf-metadata@cgd.ucar.edu></a><br>
              <b>Subject: </b>Re: [CF-metadata] Overlapping vertical
              bounds<o:p></o:p></span></p>
        </div>
        <div>
          <p class="MsoNormal"><span style="font-family:"Times New
              Roman""><o:p> </o:p></span></p>
        </div>
        <p>What makes you think overlapping bounds are illegal?<o:p></o:p></p>
        <p class="MsoNormal"><o:p> </o:p></p>
        <div>
          <p class="MsoNormal">On 3/2/17 7:20 PM, Manning, Evan M (398B)
            wrote:<o:p></o:p></p>
        </div>
        <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
          <p class="MsoNormal"><span style="font-size:11.0pt">I have
              some quantities which are defined on trapezoids in the
              vertical direction.</span><o:p></o:p></p>
          <p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
          <p class="MsoNormal"><span style="font-size:11.0pt">For
              example the top trap might be full weight from the top of
              the atmosphere (TOA) to 50 hPa, then we ramp linearly
              between the first and second traps between 50 & 75
              hPa, then trap 2 is full weight 75-100 hPa, followed by
              another transition in [100, 125] hPa, etc.</span><o:p></o:p></p>
          <p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
          <p class="MsoNormal"><span style="font-size:11.0pt">I can’t
              have a bounds variable with the full extent of each trap
              like [ [0, 75], [50, 125], [100, … because overlap is
              illegal.</span><o:p></o:p></p>
          <p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
          <p class="MsoNormal"><span style="font-size:11.0pt">I could
              have underlap, just giving the intervals where each trap
              is in full force: [ [0, 50], [75, 100], …</span><o:p></o:p></p>
          <p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
          <p class="MsoNormal"><span style="font-size:11.0pt">Or I could
              use the midpoints of the transitions: [ [ 0, 62.5], [62.5,
              112.5], …</span><o:p></o:p></p>
          <p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
          <p class="MsoNormal"><span style="font-size:11.0pt">I’d prefer
              to find a standard way to communicate the precise
              situation.  Is there one?</span><o:p></o:p></p>
          <p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
          <p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
          <p class="MsoNormal"><span style="font-size:11.0pt">  -- Evan</span><o:p></o:p></p>
          <p class="MsoNormal"><span style="font-family:"Times New
              Roman""><br>
              <br>
              <br>
              <o:p></o:p></span></p>
          <pre>_______________________________________________<o:p></o:p></pre>
          <pre>CF-metadata mailing list<o:p></o:p></pre>
          <pre><a moz-do-not-send="true" href="mailto:CF-metadata@cgd.ucar.edu">CF-metadata@cgd.ucar.edu</a><o:p></o:p></pre>
          <pre><a moz-do-not-send="true" href="http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata">http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata</a><o:p></o:p></pre>
        </blockquote>
        <p class="MsoNormal"><span style="font-family:"Times New
            Roman""><o:p> </o:p></span></p>
        <div>
          <p class="MsoNormal"><span style="font-family:"Times New
              Roman"">-- <o:p></o:p></span></p>
          <div>
            <div>
              <div>
                <table class="MsoNormalTable"
                  style="width:375.0pt;border-collapse:collapse"
                  border="0" cellpadding="0" cellspacing="0" width="500">
                  <tbody>
                    <tr style="height:53.25pt">
                      <td style="width:53.25pt;padding:1.5pt 1.5pt 1.5pt
                        1.5pt;height:53.25pt" width="71">
                        <p class="MsoNormal"
                          style="text-align:center;line-height:9.0pt"
                          align="center"><span
                            style="font-size:8.5pt;font-family:Arial;color:#333333"><a
                              moz-do-not-send="true"
                              href="http://www.cicsnc.org/"><b><span
                                  style="color:#263A8F;text-decoration:none"><img
                                    id="_x0000_i1025"
                                    src="cid:part3.6A73E01D.E8325599@noaa.gov"
                                    alt="ICS-NC" height="98" border="0"
                                    width="96"></span></b></a>Visit us
                            on <br>
                            <a moz-do-not-send="true"
                              href="http://www.facebook.com/cicsnc"><b><span
style="color:#263A8F;text-decoration:none">Facebook
                                </span></b></a></span><span
                            style="font-size:10.5pt;font-family:Times;color:#333333"><o:p></o:p></span></p>
                      </td>
                      <td style="padding:1.5pt 1.5pt 1.5pt
                        1.5pt;height:53.25pt" valign="top">
                        <p class="MsoNormal" style="line-height:9.0pt"><b><span
style="font-size:8.5pt;font-family:Arial;color:#333333">Jim Biard</span></b><span
style="font-size:8.5pt;font-family:Arial;color:#333333">
                            <br>
                            <b>Research Scholar</b> <br>
                            <a moz-do-not-send="true"
                              href="http://cicsnc.org/"><b><span
                                  style="color:#263A8F;text-decoration:none">Cooperative
                                  Institute for Climate and Satellites
                                  NC
                                </span></b></a><br>
                            <a moz-do-not-send="true"
                              href="http://ncsu.edu/"><b><span
                                  style="color:#263A8F;text-decoration:none">North
                                  Carolina State University
                                </span></b></a><br>
                            <a moz-do-not-send="true"
                              href="http://ncdc.noaa.gov/"><b><span
                                  style="color:#263A8F;text-decoration:none">NOAA
                                  National Centers for Environmental
                                  Information
                                </span></b></a><br>
                            <i>formerly NOAA’s National Climatic Data
                              Center</i> <br>
                            151 Patton Ave, Asheville, NC 28801 <br>
                            e: <a moz-do-not-send="true"
                              href="mailto:jbiard@cicsnc.org"><span
                                style="color:#263A8F">jbiard@cicsnc.org</span></a>
                            <br>
                            o: +1 828 271 4900 <br>
                            <br>
                          </span><i><span
                              style="font-size:8.5pt;font-family:Arial;color:gray">Connect
                              with us on Facebook for
                              <a moz-do-not-send="true"
                                href="https://www.facebook.com/NOAANCEIclimate"><span
                                  style="color:#263A8F">climate</span></a>
                              and
                              <a moz-do-not-send="true"
                                href="https://www.facebook.com/NOAANCEIoceangeo"><span
                                  style="color:#263A8F">ocean and
                                  geophysics</span></a> information, and
                              follow us on Twitter at
                              <a moz-do-not-send="true"
                                href="https://twitter.com/NOAANCEIclimate"><span
                                  style="color:#263A8F">@NOAANCEIclimate</span></a>
                              and
                              <a moz-do-not-send="true"
                                href="https://twitter.com/NOAANCEIocngeo"><span
                                  style="color:#263A8F">@NOAANCEIocngeo</span></a>.
                            </span></i><span
                            style="font-size:10.5pt;font-family:Times;color:#333333"><o:p></o:p></span></p>
                      </td>
                    </tr>
                  </tbody>
                </table>
                <p class="MsoNormal"><span
                    style="font-size:13.5pt;font-family:Helvetica;color:black"><o:p> </o:p></span></p>
              </div>
            </div>
          </div>
        </div>
      </div>
      <br>
      <fieldset class="mimeAttachmentHeader"></fieldset>
      <br>
      <pre wrap="">_______________________________________________
CF-metadata mailing list
<a class="moz-txt-link-abbreviated" href="mailto:CF-metadata@cgd.ucar.edu">CF-metadata@cgd.ucar.edu</a>
<a class="moz-txt-link-freetext" href="http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata">http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata</a>
</pre>
    </blockquote>
    <br>
  </body>
</html>