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    <p>Jonathan,</p>
    <p>There is an associated convention, the <a
href="http://wiki.esipfed.org/index.php/Attribute_Convention_for_Data_Discovery_1-3">Attribute
        Convention for Dataset Discovery (ACDD)</a> that defines
      file-level attributes detailing things like
      time_coverage_resolution. The issue of high-rate time data arises
      with satellite data as well. The files often end up with a time
      variable containing lower-rate start times for groups of
      measurements. Some also have a second coordinate variable
      containing fixed relative times that are intended to be
      interpreted as offsets to the start times, but this is not a
      standardized practice.</p>
    <p>Grace and peace,</p>
    <p>Jim<br>
    </p>
    <br>
    <div class="moz-cite-prefix">On 4/10/17 4:33 PM, Maccarthy, Jonathan
      K wrote:<br>
    </div>
    <blockquote cite="mid:A734CD40-E910-4D88-846B-91532701C237@lanl.gov"
      type="cite">
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      Seth & Roy,
      <div class=""><br class="">
      </div>
      <div class="">Technically CF-compliant but “unconventional” is
        probably not the way to go, as I’d miss out on the tools that
        use the convention, which is the point of using the standard.  I
        think I just needed someone to help me navigate the CF
        documents, as they’re rather dense and unfamiliar:-)
         Originally, I came across this EarthCube page (<a
          moz-do-not-send="true"
          href="https://www.earthcube.org/group/advancing-netcdf-cf"
          class="">https://www.earthcube.org/group/advancing-netcdf-cf</a>)
        about expanding CF conventions, and I thought I'd read that a
        seismologist was involved.  Seismology formats are a zoo, so I’m
        always on the hunt for a well-documented standard, especially
        one with community already behind it:-)</div>
      <div class=""><br class="">
      </div>
      <div class="">Thanks again, all!</div>
      <div class=""><br class="">
      </div>
      <div class="">Best,</div>
      <div class="">Jon</div>
      <div class=""><br class="">
        <div>
          <blockquote type="cite" class="">
            <div class="">On Apr 10, 2017, at 11:54 AM, Seth McGinnis
              <<a moz-do-not-send="true"
                href="mailto:mcginnis@ucar.edu" class="">mcginnis@ucar.edu</a>>
              wrote:</div>
            <br class="Apple-interchange-newline">
            <div class=""><span style="font-family: Helvetica;
                font-size: 12px; font-style: normal; font-variant-caps:
                normal; font-weight: normal; letter-spacing: normal;
                orphans: auto; text-align: start; text-indent: 0px;
                text-transform: none; white-space: normal; widows: auto;
                word-spacing: 0px; -webkit-text-stroke-width: 0px;
                float: none; display: inline !important;" class="">Hi
                Jonathan,</span><br style="font-family: Helvetica;
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                class="">
              <br style="font-family: Helvetica; font-size: 12px;
                font-style: normal; font-variant-caps: normal;
                font-weight: normal; letter-spacing: normal; orphans:
                auto; text-align: start; text-indent: 0px;
                text-transform: none; white-space: normal; widows: auto;
                word-spacing: 0px; -webkit-text-stroke-width: 0px;"
                class="">
              <span style="font-family: Helvetica; font-size: 12px;
                font-style: normal; font-variant-caps: normal;
                font-weight: normal; letter-spacing: normal; orphans:
                auto; text-align: start; text-indent: 0px;
                text-transform: none; white-space: normal; widows: auto;
                word-spacing: 0px; -webkit-text-stroke-width: 0px;
                float: none; display: inline !important;" class="">Oh,
                climate model outputs are also supposed to have a
                uniform sample</span><br style="font-family: Helvetica;
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                normal; font-weight: normal; letter-spacing: normal;
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                class="">
              <span style="font-family: Helvetica; font-size: 12px;
                font-style: normal; font-variant-caps: normal;
                font-weight: normal; letter-spacing: normal; orphans:
                auto; text-align: start; text-indent: 0px;
                text-transform: none; white-space: normal; widows: auto;
                word-spacing: 0px; -webkit-text-stroke-width: 0px;
                float: none; display: inline !important;" class="">rate
                for the whole time series -- emphasis on *SUPPOSED TO*.
                 To my</span><br style="font-family: Helvetica;
                font-size: 12px; font-style: normal; font-variant-caps:
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                text-transform: none; white-space: normal; widows: auto;
                word-spacing: 0px; -webkit-text-stroke-width: 0px;"
                class="">
              <span style="font-family: Helvetica; font-size: 12px;
                font-style: normal; font-variant-caps: normal;
                font-weight: normal; letter-spacing: normal; orphans:
                auto; text-align: start; text-indent: 0px;
                text-transform: none; white-space: normal; widows: auto;
                word-spacing: 0px; -webkit-text-stroke-width: 0px;
                float: none; display: inline !important;" class="">dismay,
                I have encountered multiple cases where something went
                wrong</span><br style="font-family: Helvetica;
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                text-transform: none; white-space: normal; widows: auto;
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                class="">
              <span style="font-family: Helvetica; font-size: 12px;
                font-style: normal; font-variant-caps: normal;
                font-weight: normal; letter-spacing: normal; orphans:
                auto; text-align: start; text-indent: 0px;
                text-transform: none; white-space: normal; widows: auto;
                word-spacing: 0px; -webkit-text-stroke-width: 0px;
                float: none; display: inline !important;" class="">with
                the generation of the data files, resulting in missing
                or repeated</span><br style="font-family: Helvetica;
                font-size: 12px; font-style: normal; font-variant-caps:
                normal; font-weight: normal; letter-spacing: normal;
                orphans: auto; text-align: start; text-indent: 0px;
                text-transform: none; white-space: normal; widows: auto;
                word-spacing: 0px; -webkit-text-stroke-width: 0px;"
                class="">
              <span style="font-family: Helvetica; font-size: 12px;
                font-style: normal; font-variant-caps: normal;
                font-weight: normal; letter-spacing: normal; orphans:
                auto; text-align: start; text-indent: 0px;
                text-transform: none; white-space: normal; widows: auto;
                word-spacing: 0px; -webkit-text-stroke-width: 0px;
                float: none; display: inline !important;" class="">or
                weirdly-spaced timesteps, and sorting out the resulting
                problems is</span><br style="font-family: Helvetica;
                font-size: 12px; font-style: normal; font-variant-caps:
                normal; font-weight: normal; letter-spacing: normal;
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                class="">
              <span style="font-family: Helvetica; font-size: 12px;
                font-style: normal; font-variant-caps: normal;
                font-weight: normal; letter-spacing: normal; orphans:
                auto; text-align: start; text-indent: 0px;
                text-transform: none; white-space: normal; widows: auto;
                word-spacing: 0px; -webkit-text-stroke-width: 0px;
                float: none; display: inline !important;" class="">how I
                came to appreciate the value of the explicit
                coordinate...</span><br style="font-family: Helvetica;
                font-size: 12px; font-style: normal; font-variant-caps:
                normal; font-weight: normal; letter-spacing: normal;
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                class="">
              <br style="font-family: Helvetica; font-size: 12px;
                font-style: normal; font-variant-caps: normal;
                font-weight: normal; letter-spacing: normal; orphans:
                auto; text-align: start; text-indent: 0px;
                text-transform: none; white-space: normal; widows: auto;
                word-spacing: 0px; -webkit-text-stroke-width: 0px;"
                class="">
              <span style="font-family: Helvetica; font-size: 12px;
                font-style: normal; font-variant-caps: normal;
                font-weight: normal; letter-spacing: normal; orphans:
                auto; text-align: start; text-indent: 0px;
                text-transform: none; white-space: normal; widows: auto;
                word-spacing: 0px; -webkit-text-stroke-width: 0px;
                float: none; display: inline !important;" class="">As
                far as I know, you are correct that CF does not have a
                standardized</span><br style="font-family: Helvetica;
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                class="">
              <span style="font-family: Helvetica; font-size: 12px;
                font-style: normal; font-variant-caps: normal;
                font-weight: normal; letter-spacing: normal; orphans:
                auto; text-align: start; text-indent: 0px;
                text-transform: none; white-space: normal; widows: auto;
                word-spacing: 0px; -webkit-text-stroke-width: 0px;
                float: none; display: inline !important;" class="">way
                to represent a coordinate solely in terms of a formula
                without</span><br style="font-family: Helvetica;
                font-size: 12px; font-style: normal; font-variant-caps:
                normal; font-weight: normal; letter-spacing: normal;
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                class="">
              <span style="font-family: Helvetica; font-size: 12px;
                font-style: normal; font-variant-caps: normal;
                font-weight: normal; letter-spacing: normal; orphans:
                auto; text-align: start; text-indent: 0px;
                text-transform: none; white-space: normal; widows: auto;
                word-spacing: 0px; -webkit-text-stroke-width: 0px;
                float: none; display: inline !important;" class="">reference
                to a corresponding coordinate variable.</span><br
                style="font-family: Helvetica; font-size: 12px;
                font-style: normal; font-variant-caps: normal;
                font-weight: normal; letter-spacing: normal; orphans:
                auto; text-align: start; text-indent: 0px;
                text-transform: none; white-space: normal; widows: auto;
                word-spacing: 0px; -webkit-text-stroke-width: 0px;"
                class="">
              <br style="font-family: Helvetica; font-size: 12px;
                font-style: normal; font-variant-caps: normal;
                font-weight: normal; letter-spacing: normal; orphans:
                auto; text-align: start; text-indent: 0px;
                text-transform: none; white-space: normal; widows: auto;
                word-spacing: 0px; -webkit-text-stroke-width: 0px;"
                class="">
              <span style="font-family: Helvetica; font-size: 12px;
                font-style: normal; font-variant-caps: normal;
                font-weight: normal; letter-spacing: normal; orphans:
                auto; text-align: start; text-indent: 0px;
                text-transform: none; white-space: normal; widows: auto;
                word-spacing: 0px; -webkit-text-stroke-width: 0px;
                float: none; display: inline !important;" class="">However,
                that doesn't mean you couldn't do it and still have the
                file be</span><br style="font-family: Helvetica;
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                class="">
              <span style="font-family: Helvetica; font-size: 12px;
                font-style: normal; font-variant-caps: normal;
                font-weight: normal; letter-spacing: normal; orphans:
                auto; text-align: start; text-indent: 0px;
                text-transform: none; white-space: normal; widows: auto;
                word-spacing: 0px; -webkit-text-stroke-width: 0px;
                float: none; display: inline !important;" class="">CF-compliant.
                 As far as I am aware (and somebody correct me if I'm</span><br
                style="font-family: Helvetica; font-size: 12px;
                font-style: normal; font-variant-caps: normal;
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                word-spacing: 0px; -webkit-text-stroke-width: 0px;"
                class="">
              <span style="font-family: Helvetica; font-size: 12px;
                font-style: normal; font-variant-caps: normal;
                font-weight: normal; letter-spacing: normal; orphans:
                auto; text-align: start; text-indent: 0px;
                text-transform: none; white-space: normal; widows: auto;
                word-spacing: 0px; -webkit-text-stroke-width: 0px;
                float: none; display: inline !important;" class="">wrong),
                coordinate variables are not actually mandatory.</span><br
                style="font-family: Helvetica; font-size: 12px;
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                word-spacing: 0px; -webkit-text-stroke-width: 0px;"
                class="">
              <br style="font-family: Helvetica; font-size: 12px;
                font-style: normal; font-variant-caps: normal;
                font-weight: normal; letter-spacing: normal; orphans:
                auto; text-align: start; text-indent: 0px;
                text-transform: none; white-space: normal; widows: auto;
                word-spacing: 0px; -webkit-text-stroke-width: 0px;"
                class="">
              <span style="font-family: Helvetica; font-size: 12px;
                font-style: normal; font-variant-caps: normal;
                font-weight: normal; letter-spacing: normal; orphans:
                auto; text-align: start; text-indent: 0px;
                text-transform: none; white-space: normal; widows: auto;
                word-spacing: 0px; -webkit-text-stroke-width: 0px;
                float: none; display: inline !important;" class="">So
                if, for reasons of feasibility, you found it necessary
                to do</span><br style="font-family: Helvetica;
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                word-spacing: 0px; -webkit-text-stroke-width: 0px;"
                class="">
              <span style="font-family: Helvetica; font-size: 12px;
                font-style: normal; font-variant-caps: normal;
                font-weight: normal; letter-spacing: normal; orphans:
                auto; text-align: start; text-indent: 0px;
                text-transform: none; white-space: normal; widows: auto;
                word-spacing: 0px; -webkit-text-stroke-width: 0px;
                float: none; display: inline !important;" class="">something
                like the following, I believe that strictly speaking it
                would</span><br style="font-family: Helvetica;
                font-size: 12px; font-style: normal; font-variant-caps:
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                text-transform: none; white-space: normal; widows: auto;
                word-spacing: 0px; -webkit-text-stroke-width: 0px;"
                class="">
              <span style="font-family: Helvetica; font-size: 12px;
                font-style: normal; font-variant-caps: normal;
                font-weight: normal; letter-spacing: normal; orphans:
                auto; text-align: start; text-indent: 0px;
                text-transform: none; white-space: normal; widows: auto;
                word-spacing: 0px; -webkit-text-stroke-width: 0px;
                float: none; display: inline !important;" class="">be
                not just allowed but fully CF-compliant:</span><br
                style="font-family: Helvetica; font-size: 12px;
                font-style: normal; font-variant-caps: normal;
                font-weight: normal; letter-spacing: normal; orphans:
                auto; text-align: start; text-indent: 0px;
                text-transform: none; white-space: normal; widows: auto;
                word-spacing: 0px; -webkit-text-stroke-width: 0px;"
                class="">
              <br style="font-family: Helvetica; font-size: 12px;
                font-style: normal; font-variant-caps: normal;
                font-weight: normal; letter-spacing: normal; orphans:
                auto; text-align: start; text-indent: 0px;
                text-transform: none; white-space: normal; widows: auto;
                word-spacing: 0px; -webkit-text-stroke-width: 0px;"
                class="">
              <span style="font-family: Helvetica; font-size: 12px;
                font-style: normal; font-variant-caps: normal;
                font-weight: normal; letter-spacing: normal; orphans:
                auto; text-align: start; text-indent: 0px;
                text-transform: none; white-space: normal; widows: auto;
                word-spacing: 0px; -webkit-text-stroke-width: 0px;
                float: none; display: inline !important;" class="">dimensions:</span><br
                style="font-family: Helvetica; font-size: 12px;
                font-style: normal; font-variant-caps: normal;
                font-weight: normal; letter-spacing: normal; orphans:
                auto; text-align: start; text-indent: 0px;
                text-transform: none; white-space: normal; widows: auto;
                word-spacing: 0px; -webkit-text-stroke-width: 0px;"
                class="">
              <span style="font-family: Helvetica; font-size: 12px;
                font-style: normal; font-variant-caps: normal;
                font-weight: normal; letter-spacing: normal; orphans:
                auto; text-align: start; text-indent: 0px;
                text-transform: none; white-space: normal; widows: auto;
                word-spacing: 0px; -webkit-text-stroke-width: 0px;
                float: none; display: inline !important;" class=""> time
                = UNLIMITED; // (1892160000 currently)</span><br
                style="font-family: Helvetica; font-size: 12px;
                font-style: normal; font-variant-caps: normal;
                font-weight: normal; letter-spacing: normal; orphans:
                auto; text-align: start; text-indent: 0px;
                text-transform: none; white-space: normal; widows: auto;
                word-spacing: 0px; -webkit-text-stroke-width: 0px;"
                class="">
              <span style="font-family: Helvetica; font-size: 12px;
                font-style: normal; font-variant-caps: normal;
                font-weight: normal; letter-spacing: normal; orphans:
                auto; text-align: start; text-indent: 0px;
                text-transform: none; white-space: normal; widows: auto;
                word-spacing: 0px; -webkit-text-stroke-width: 0px;
                float: none; display: inline !important;" class="">variables:</span><br
                style="font-family: Helvetica; font-size: 12px;
                font-style: normal; font-variant-caps: normal;
                font-weight: normal; letter-spacing: normal; orphans:
                auto; text-align: start; text-indent: 0px;
                text-transform: none; white-space: normal; widows: auto;
                word-spacing: 0px; -webkit-text-stroke-width: 0px;"
                class="">
              <span style="font-family: Helvetica; font-size: 12px;
                font-style: normal; font-variant-caps: normal;
                font-weight: normal; letter-spacing: normal; orphans:
                auto; text-align: start; text-indent: 0px;
                text-transform: none; white-space: normal; widows: auto;
                word-spacing: 0px; -webkit-text-stroke-width: 0px;
                float: none; display: inline !important;" class=""> double
                acceleration(time);</span><br style="font-family:
                Helvetica; font-size: 12px; font-style: normal;
                font-variant-caps: normal; font-weight: normal;
                letter-spacing: normal; orphans: auto; text-align:
                start; text-indent: 0px; text-transform: none;
                white-space: normal; widows: auto; word-spacing: 0px;
                -webkit-text-stroke-width: 0px;" class="">
              <span style="font-family: Helvetica; font-size: 12px;
                font-style: normal; font-variant-caps: normal;
                font-weight: normal; letter-spacing: normal; orphans:
                auto; text-align: start; text-indent: 0px;
                text-transform: none; white-space: normal; widows: auto;
                word-spacing: 0px; -webkit-text-stroke-width: 0px;
                float: none; display: inline !important;" class="">   acceleration:long_name
                = "ground acceleration";</span><br style="font-family:
                Helvetica; font-size: 12px; font-style: normal;
                font-variant-caps: normal; font-weight: normal;
                letter-spacing: normal; orphans: auto; text-align:
                start; text-indent: 0px; text-transform: none;
                white-space: normal; widows: auto; word-spacing: 0px;
                -webkit-text-stroke-width: 0px;" class="">
              <span style="font-family: Helvetica; font-size: 12px;
                font-style: normal; font-variant-caps: normal;
                font-weight: normal; letter-spacing: normal; orphans:
                auto; text-align: start; text-indent: 0px;
                text-transform: none; white-space: normal; widows: auto;
                word-spacing: 0px; -webkit-text-stroke-width: 0px;
                float: none; display: inline !important;" class="">   acceleration:units
                = "m s-2";</span><br style="font-family: Helvetica;
                font-size: 12px; font-style: normal; font-variant-caps:
                normal; font-weight: normal; letter-spacing: normal;
                orphans: auto; text-align: start; text-indent: 0px;
                text-transform: none; white-space: normal; widows: auto;
                word-spacing: 0px; -webkit-text-stroke-width: 0px;"
                class="">
              <span style="font-family: Helvetica; font-size: 12px;
                font-style: normal; font-variant-caps: normal;
                font-weight: normal; letter-spacing: normal; orphans:
                auto; text-align: start; text-indent: 0px;
                text-transform: none; white-space: normal; widows: auto;
                word-spacing: 0px; -webkit-text-stroke-width: 0px;
                float: none; display: inline !important;" class="">   acceleration:start_time
                = "2017-01-01 00:00:00.01667"</span><br
                style="font-family: Helvetica; font-size: 12px;
                font-style: normal; font-variant-caps: normal;
                font-weight: normal; letter-spacing: normal; orphans:
                auto; text-align: start; text-indent: 0px;
                text-transform: none; white-space: normal; widows: auto;
                word-spacing: 0px; -webkit-text-stroke-width: 0px;"
                class="">
              <span style="font-family: Helvetica; font-size: 12px;
                font-style: normal; font-variant-caps: normal;
                font-weight: normal; letter-spacing: normal; orphans:
                auto; text-align: start; text-indent: 0px;
                text-transform: none; white-space: normal; widows: auto;
                word-spacing: 0px; -webkit-text-stroke-width: 0px;
                float: none; display: inline !important;" class="">   acceleration:sampling_rate
                = "60 hz"</span><br style="font-family: Helvetica;
                font-size: 12px; font-style: normal; font-variant-caps:
                normal; font-weight: normal; letter-spacing: normal;
                orphans: auto; text-align: start; text-indent: 0px;
                text-transform: none; white-space: normal; widows: auto;
                word-spacing: 0px; -webkit-text-stroke-width: 0px;"
                class="">
              <span style="font-family: Helvetica; font-size: 12px;
                font-style: normal; font-variant-caps: normal;
                font-weight: normal; letter-spacing: normal; orphans:
                auto; text-align: start; text-indent: 0px;
                text-transform: none; white-space: normal; widows: auto;
                word-spacing: 0px; -webkit-text-stroke-width: 0px;
                float: none; display: inline !important;" class="">data:</span><br
                style="font-family: Helvetica; font-size: 12px;
                font-style: normal; font-variant-caps: normal;
                font-weight: normal; letter-spacing: normal; orphans:
                auto; text-align: start; text-indent: 0px;
                text-transform: none; white-space: normal; widows: auto;
                word-spacing: 0px; -webkit-text-stroke-width: 0px;"
                class="">
              <span style="font-family: Helvetica; font-size: 12px;
                font-style: normal; font-variant-caps: normal;
                font-weight: normal; letter-spacing: normal; orphans:
                auto; text-align: start; text-indent: 0px;
                text-transform: none; white-space: normal; widows: auto;
                word-spacing: 0px; -webkit-text-stroke-width: 0px;
                float: none; display: inline !important;" class="">   acceleration
                = 1.324145e-6, ...</span><br style="font-family:
                Helvetica; font-size: 12px; font-style: normal;
                font-variant-caps: normal; font-weight: normal;
                letter-spacing: normal; orphans: auto; text-align:
                start; text-indent: 0px; text-transform: none;
                white-space: normal; widows: auto; word-spacing: 0px;
                -webkit-text-stroke-width: 0px;" class="">
              <br style="font-family: Helvetica; font-size: 12px;
                font-style: normal; font-variant-caps: normal;
                font-weight: normal; letter-spacing: normal; orphans:
                auto; text-align: start; text-indent: 0px;
                text-transform: none; white-space: normal; widows: auto;
                word-spacing: 0px; -webkit-text-stroke-width: 0px;"
                class="">
              <br style="font-family: Helvetica; font-size: 12px;
                font-style: normal; font-variant-caps: normal;
                font-weight: normal; letter-spacing: normal; orphans:
                auto; text-align: start; text-indent: 0px;
                text-transform: none; white-space: normal; widows: auto;
                word-spacing: 0px; -webkit-text-stroke-width: 0px;"
                class="">
              <span style="font-family: Helvetica; font-size: 12px;
                font-style: normal; font-variant-caps: normal;
                font-weight: normal; letter-spacing: normal; orphans:
                auto; text-align: start; text-indent: 0px;
                text-transform: none; white-space: normal; widows: auto;
                word-spacing: 0px; -webkit-text-stroke-width: 0px;
                float: none; display: inline !important;" class="">I
                actually have some files without any coordinate
                variables sitting</span><br style="font-family:
                Helvetica; font-size: 12px; font-style: normal;
                font-variant-caps: normal; font-weight: normal;
                letter-spacing: normal; orphans: auto; text-align:
                start; text-indent: 0px; text-transform: none;
                white-space: normal; widows: auto; word-spacing: 0px;
                -webkit-text-stroke-width: 0px;" class="">
              <span style="font-family: Helvetica; font-size: 12px;
                font-style: normal; font-variant-caps: normal;
                font-weight: normal; letter-spacing: normal; orphans:
                auto; text-align: start; text-indent: 0px;
                text-transform: none; white-space: normal; widows: auto;
                word-spacing: 0px; -webkit-text-stroke-width: 0px;
                float: none; display: inline !important;" class="">around
                from the intermediate stage of some processing I did; I
                checked</span><br style="font-family: Helvetica;
                font-size: 12px; font-style: normal; font-variant-caps:
                normal; font-weight: normal; letter-spacing: normal;
                orphans: auto; text-align: start; text-indent: 0px;
                text-transform: none; white-space: normal; widows: auto;
                word-spacing: 0px; -webkit-text-stroke-width: 0px;"
                class="">
              <span style="font-family: Helvetica; font-size: 12px;
                font-style: normal; font-variant-caps: normal;
                font-weight: normal; letter-spacing: normal; orphans:
                auto; text-align: start; text-indent: 0px;
                text-transform: none; white-space: normal; widows: auto;
                word-spacing: 0px; -webkit-text-stroke-width: 0px;
                float: none; display: inline !important;" class="">one
                with Rosalyn Hatcher's cf-checker, and it didn't
                complain, so I</span><br style="font-family: Helvetica;
                font-size: 12px; font-style: normal; font-variant-caps:
                normal; font-weight: normal; letter-spacing: normal;
                orphans: auto; text-align: start; text-indent: 0px;
                text-transform: none; white-space: normal; widows: auto;
                word-spacing: 0px; -webkit-text-stroke-width: 0px;"
                class="">
              <span style="font-family: Helvetica; font-size: 12px;
                font-style: normal; font-variant-caps: normal;
                font-weight: normal; letter-spacing: normal; orphans:
                auto; text-align: start; text-indent: 0px;
                text-transform: none; white-space: normal; widows: auto;
                word-spacing: 0px; -webkit-text-stroke-width: 0px;
                float: none; display: inline !important;" class="">think
                it is technically legal.  It's kind of a
                letter-of-the-law rather</span><br style="font-family:
                Helvetica; font-size: 12px; font-style: normal;
                font-variant-caps: normal; font-weight: normal;
                letter-spacing: normal; orphans: auto; text-align:
                start; text-indent: 0px; text-transform: none;
                white-space: normal; widows: auto; word-spacing: 0px;
                -webkit-text-stroke-width: 0px;" class="">
              <span style="font-family: Helvetica; font-size: 12px;
                font-style: normal; font-variant-caps: normal;
                font-weight: normal; letter-spacing: normal; orphans:
                auto; text-align: start; text-indent: 0px;
                text-transform: none; white-space: normal; widows: auto;
                word-spacing: 0px; -webkit-text-stroke-width: 0px;
                float: none; display: inline !important;" class="">than
                spirit-of-the-law thing, but it's at least theoretically
                compliant.</span><br style="font-family: Helvetica;
                font-size: 12px; font-style: normal; font-variant-caps:
                normal; font-weight: normal; letter-spacing: normal;
                orphans: auto; text-align: start; text-indent: 0px;
                text-transform: none; white-space: normal; widows: auto;
                word-spacing: 0px; -webkit-text-stroke-width: 0px;"
                class="">
              <span style="font-family: Helvetica; font-size: 12px;
                font-style: normal; font-variant-caps: normal;
                font-weight: normal; letter-spacing: normal; orphans:
                auto; text-align: start; text-indent: 0px;
                text-transform: none; white-space: normal; widows: auto;
                word-spacing: 0px; -webkit-text-stroke-width: 0px;
                float: none; display: inline !important;" class="">Up to
                you whether that would count as sufficiently suitable
                for your</span><br style="font-family: Helvetica;
                font-size: 12px; font-style: normal; font-variant-caps:
                normal; font-weight: normal; letter-spacing: normal;
                orphans: auto; text-align: start; text-indent: 0px;
                text-transform: none; white-space: normal; widows: auto;
                word-spacing: 0px; -webkit-text-stroke-width: 0px;"
                class="">
              <span style="font-family: Helvetica; font-size: 12px;
                font-style: normal; font-variant-caps: normal;
                font-weight: normal; letter-spacing: normal; orphans:
                auto; text-align: start; text-indent: 0px;
                text-transform: none; white-space: normal; widows: auto;
                word-spacing: 0px; -webkit-text-stroke-width: 0px;
                float: none; display: inline !important;" class="">use
                case.</span><br style="font-family: Helvetica;
                font-size: 12px; font-style: normal; font-variant-caps:
                normal; font-weight: normal; letter-spacing: normal;
                orphans: auto; text-align: start; text-indent: 0px;
                text-transform: none; white-space: normal; widows: auto;
                word-spacing: 0px; -webkit-text-stroke-width: 0px;"
                class="">
              <br style="font-family: Helvetica; font-size: 12px;
                font-style: normal; font-variant-caps: normal;
                font-weight: normal; letter-spacing: normal; orphans:
                auto; text-align: start; text-indent: 0px;
                text-transform: none; white-space: normal; widows: auto;
                word-spacing: 0px; -webkit-text-stroke-width: 0px;"
                class="">
              <span style="font-family: Helvetica; font-size: 12px;
                font-style: normal; font-variant-caps: normal;
                font-weight: normal; letter-spacing: normal; orphans:
                auto; text-align: start; text-indent: 0px;
                text-transform: none; white-space: normal; widows: auto;
                word-spacing: 0px; -webkit-text-stroke-width: 0px;
                float: none; display: inline !important;" class="">Cheers,</span><br
                style="font-family: Helvetica; font-size: 12px;
                font-style: normal; font-variant-caps: normal;
                font-weight: normal; letter-spacing: normal; orphans:
                auto; text-align: start; text-indent: 0px;
                text-transform: none; white-space: normal; widows: auto;
                word-spacing: 0px; -webkit-text-stroke-width: 0px;"
                class="">
              <br style="font-family: Helvetica; font-size: 12px;
                font-style: normal; font-variant-caps: normal;
                font-weight: normal; letter-spacing: normal; orphans:
                auto; text-align: start; text-indent: 0px;
                text-transform: none; white-space: normal; widows: auto;
                word-spacing: 0px; -webkit-text-stroke-width: 0px;"
                class="">
              <span style="font-family: Helvetica; font-size: 12px;
                font-style: normal; font-variant-caps: normal;
                font-weight: normal; letter-spacing: normal; orphans:
                auto; text-align: start; text-indent: 0px;
                text-transform: none; white-space: normal; widows: auto;
                word-spacing: 0px; -webkit-text-stroke-width: 0px;
                float: none; display: inline !important;" class="">--Seth</span><br
                style="font-family: Helvetica; font-size: 12px;
                font-style: normal; font-variant-caps: normal;
                font-weight: normal; letter-spacing: normal; orphans:
                auto; text-align: start; text-indent: 0px;
                text-transform: none; white-space: normal; widows: auto;
                word-spacing: 0px; -webkit-text-stroke-width: 0px;"
                class="">
              <br style="font-family: Helvetica; font-size: 12px;
                font-style: normal; font-variant-caps: normal;
                font-weight: normal; letter-spacing: normal; orphans:
                auto; text-align: start; text-indent: 0px;
                text-transform: none; white-space: normal; widows: auto;
                word-spacing: 0px; -webkit-text-stroke-width: 0px;"
                class="">
              <br style="font-family: Helvetica; font-size: 12px;
                font-style: normal; font-variant-caps: normal;
                font-weight: normal; letter-spacing: normal; orphans:
                auto; text-align: start; text-indent: 0px;
                text-transform: none; white-space: normal; widows: auto;
                word-spacing: 0px; -webkit-text-stroke-width: 0px;"
                class="">
              <br style="font-family: Helvetica; font-size: 12px;
                font-style: normal; font-variant-caps: normal;
                font-weight: normal; letter-spacing: normal; orphans:
                auto; text-align: start; text-indent: 0px;
                text-transform: none; white-space: normal; widows: auto;
                word-spacing: 0px; -webkit-text-stroke-width: 0px;"
                class="">
              <span style="font-family: Helvetica; font-size: 12px;
                font-style: normal; font-variant-caps: normal;
                font-weight: normal; letter-spacing: normal; orphans:
                auto; text-align: start; text-indent: 0px;
                text-transform: none; white-space: normal; widows: auto;
                word-spacing: 0px; -webkit-text-stroke-width: 0px;
                float: none; display: inline !important;" class="">On
                4/10/17 10:54 AM, Maccarthy, Jonathan K wrote:</span><br
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              <blockquote type="cite" style="font-family: Helvetica;
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                class="">
                Hi Seth,<br class="">
                <br class="">
                Thanks for the very helpful response.  I can understand
                the argument for<br class="">
                explicit coordinates, as opposed to using formulae; I
                think it solves<br class="">
                several problems.  The assumption of a uniform sample
                rate for the<br class="">
                length of a continuous time series is deeply engrained
                in most seismic<br class="">
                software, however.  Changing that assumption may lead to
                other problems<br class="">
                (but maybe not!).  Data volumes for a single channel can
                be 40-100<br class="">
                4-byte samples per second, which is something like 5-12
                GB per channel<br class="">
                per year uncompressed.  Commonly, dozens of channels are
                used at once,<br class="">
                though some of them may share time coordinates.  It
                sounds like this<br class="">
                use-case is similar in volume to what you've used, and
                may be worth<br class="">
                trying out.<br class="">
                <br class="">
                Just to be clear, however, would I be correct in saying
                that CF has no<br class="">
                accepted way of representing the data as I've described?<br
                  class="">
                <br class="">
                Thanks again,<br class="">
                Jonathan<br class="">
                <br class="">
                <blockquote type="cite" class="">On Apr 7, 2017, at 4:43
                  PM, Seth McGinnis <<a moz-do-not-send="true"
                    href="mailto:mcginnis@ucar.edu" class="">mcginnis@ucar.edu</a><br
                    class="">
                  <<a moz-do-not-send="true"
                    href="mailto:mcginnis@ucar.edu" class="">mailto:mcginnis@ucar.edu</a>>>
                  wrote:<br class="">
                  <br class="">
                  Hi Jonathan,<br class="">
                  <br class="">
                  I would interpret the CF stance as being that the
                  value in having<br class="">
                  explicit coordinate variables and other ancillary data
                  to accompany the<br class="">
                  data outweighs the cost of increased storage.<br
                    class="">
                  <br class="">
                  There are some cases where CF bends away from that for
                  the sake of<br class="">
                  practicality (see, e.g., the discussion about external
                  file references<br class="">
                  for cell_bounds in CMIP5), but overall, my sense is
                  that the community<br class="">
                  feels that it's better to have things explicitly
                  written out in the file<br class="">
                  than it is to provide them implicitly via a formula to
                  calculate them.<br class="">
                  <br class="">
                  Based on my personal experiences, I think this is the
                  right approach.<br class="">
                  (In fact, I take it even further: I prefer to avoid
                  data compression<br class="">
                  entirely and to keep like data with like as much as
                  possible, rather<br class="">
                  than splitting big files into smaller pieces.)<br
                    class="">
                  <br class="">
                  I have endured far, far more suffering and toil from
                  (a) trying to<br class="">
                  figure out what's wrong with a file that violates some
                  implicit<br class="">
                  assumption (like "there are never gaps in the time
                  coordinate") and (b)<br class="">
                  dealing with the complications of various tactics for
                  keeping file sizes<br class="">
                  small than I ever have from storing and working with
                  very large files.<br class="">
                  <br class="">
                  YMMV, of course.  What are your data volumes like?
                   I'm working at the<br class="">
                  terabyte scale, and as long as my file sizes stay
                  under a few dozen GB,<br class="">
                  I don't really even bother thinking about anything
                  that affects the file<br class="">
                  size by less than an order of magnitude.<br class="">
                  <br class="">
                  Cheers,<br class="">
                  <br class="">
                  Seth McGinnis<br class="">
                  <br class="">
                  ----<br class="">
                  NARCCAP / NA-CORDEX Data Manager<br class="">
                  RISC - IMAGe - CISL - NCAR<br class="">
                  ----<br class="">
                  <br class="">
                  <br class="">
                  On 4/7/17 9:55 AM, Maccarthy, Jonathan K wrote:<br
                    class="">
                  <blockquote type="cite" class="">Hi all,<br class="">
                    <br class="">
                    I’m curious about the suitability of CF metadata
                    conventions for<br class="">
                    seismic sensor data.  I’ve done a bit of searching,
                    but can’t find<br class="">
                    any mention of how CF conventions would store high
                    sample-rate data<br class="">
                    sensor data.  I do see descriptions of time series
                    conventions, where<br class="">
                    hourly or daily sensor data samples are stored along
                    with their<br class="">
                    timestamps, but storing individual timestamps for
                    each sample of a<br class="">
                    high sample rate sensor would unnecessarily double
                    the storage.<br class="">
                    Seismic formats typically don’t store time vectors,
                    but instead just<br class="">
                    store vectors of samples with an associated start
                    time and sampling<br class="">
                    rate.<br class="">
                    <br class="">
                    Could someone please point me towards a discussion
                    or existing<br class="">
                    conventions on this topic?  Any help or suggestion
                    is appreciated.<br class="">
                    <br class="">
                    Best, Jon
                    _______________________________________________
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                  </blockquote>
                  _______________________________________________<br
                    class="">
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      <pre wrap="">_______________________________________________
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</pre>
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