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Vertical levels (METRo)

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This article is about the number of vertical levels in the model of METRo.

The choice of the grid depends on the kind of road for which the road forecast is attempted.

Road Edit

For normal roads, a variable-resolution grid is used. The grid contains 29 levels under the surface, is computed at the run time and is based on the number and the composition of layers of the road. For a given composition of road, the same grid will always be used.

The grid is chosen to give a maximum resolution of 0.01 m at the surface and about 0.05 m at a depth of 0.5 m. The bottom of the variable grid is at 1.4 m, and 24 out of 29 levels lie above 0.5 m.

For more information about how the levels are disposed into the ground, please refer to the METRo article.

Bridge and overpass Edit

In the case of a bridge, a uniform grid of 0.01 m (1 cm) is used, starting at 0.5 cm.

Output of all levels of sub surface temperature Edit

Adding the flag --output-subsurface-levels adds all the levels of sub surface temperature in the output roadcast of METRo.

The output has have the following values:


Field description Element name Unit
Depth of level depth Meter
Temperature at level lev-temp Celsius
Grid level (attribute) num="n" Integer without units, 0 is the surface


Example Edit

Number are fictives.

<?xml version="1.0"?>
<roadcast>
  <header>
      <filetype>roadcast</filetype>
      <version>1.5</version>
      <road-station>oaa</road-station>
      <production-date>2004-08-26T01:00Z</production-date>
      <first-roadcast>2004-08-25T23:12Z</first-roadcast> 
      <vertical-levels>
          <depth num="0">0.00</depth>
          <depth num="1">0.01</depth>
          <depth num="2">0.02</depth>
          ...
      </vertical-levels>
  </header>
  <prediction-list>
      <prediction>
       <forecast-time>2004-08-26T00:00Z</forecast-time>
         <hh>20.0</hh>
         <at>-7.03</at>
         <td>-11.96</td>
         <ws>22.11</ws>
         <sn>0.0</sn>
         <ra>0.0</ra>
         <qp-sn>0.0</qp-sn>
         <qp-ra>0.0</qp-ra>
         <cc>7</cc>
         <sf>35.81</sf>
         <ir>298.06</ir>
         <fv>0.0</fv>
         <fc>-128.07</fc>
         <fa>10.0</fa>
         <fg>-71.37</fg>
         <bb>-287.17</bb>
         <fp>0.0</fp>
         <rc>1</rc>
         <st>-0.79</st>
         <sst>-7.02</sst>
         <tl>
            <lev-temp num="0">-8.4</lev-temp>
            <lev-temp num="1">-8.2</lev-temp>
            <lev-temp num="2">-8.3</lev-temp>
            ...
          </tl>
      </prediction>
      <prediction>
        <forecastime>
          ...
  </prediction-list>
</roadcast>



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This page is part of the documentation of the METRo software. Back to the table of content.

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