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<p>
Set the datum to an EPSG Datum code, a value in the range (6120 - 6904).<p>
Here are the codes for some of the better-known datums:<ul>
<li>NAD27 6267</li><li>NAD83 6269</li><li>WGS84 6326 </li></ul>
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<a class="anchor" name="c54c3ec4c36206816ffb6b8e4c98e3a9"></a><!-- doxytag: member="vtProjection::SetGeogCSFromDatum" ref="c54c3ec4c36206816ffb6b8e4c98e3a9" args="(int iDatum)" --><p>
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          <td class="md" nowrap valign="top">OGRErr vtProjection::SetGeogCSFromDatum           </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top">int&nbsp;</td>
          <td class="mdname1" valign="top" nowrap> <em>iDatum</em>          </td>
          <td class="md" valign="top">&nbsp;)&nbsp;</td>
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<p>
Set the projection to a fresh, new geographical coordinate system based on the indicated Datum.     </td>
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<a class="anchor" name="467fd1613be10b952ba5970fa1ec2fd8"></a><!-- doxytag: member="vtProjection::SetProjectionSimple" ref="467fd1613be10b952ba5970fa1ec2fd8" args="(bool bUTM, int iUTMZone, int iDatum)" --><p>
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          <td class="md" nowrap valign="top">bool vtProjection::SetProjectionSimple           </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top">bool&nbsp;</td>
          <td class="mdname" nowrap> <em>bUTM</em>, </td>
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          <td class="md" nowrap align="right"></td>
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          <td class="md" nowrap>int&nbsp;</td>
          <td class="mdname" nowrap> <em>iUTMZone</em>, </td>
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          <td class="md" nowrap align="right"></td>
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          <td class="md" nowrap>int&nbsp;</td>
          <td class="mdname" nowrap> <em>iDatum</em></td>
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          <td class="md">)&nbsp;</td>
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<p>
Convenient way to set a simple projection.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
  <table border="0" cellspacing="2" cellpadding="0">
    <tr><td valign="top"></td><td valign="top"><em>bUTM</em>&nbsp;</td><td>true for UTM, false for Geographic. </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>iUTMZone</em>&nbsp;</td><td>If UTM, this is the zone: 1 through 60 in the northern hemisphere, -1 through -60 for the southern hemisphere. </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>iDatum</em>&nbsp;</td><td>The Datum as either an old USGS code or an EPSG code </td></tr>
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<a class="anchor" name="d1f275b40ebce95c287495d27cd1b824"></a><!-- doxytag: member="vtProjection::SetSpatialReference" ref="d1f275b40ebce95c287495d27cd1b824" args="(OGRSpatialReference *pRef)" --><p>
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          <td class="md" nowrap valign="top">void vtProjection::SetSpatialReference           </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top">OGRSpatialReference *&nbsp;</td>
          <td class="mdname1" valign="top" nowrap> <em>pRef</em>          </td>
          <td class="md" valign="top">&nbsp;)&nbsp;</td>
          <td class="md" nowrap></td>
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<p>
Set the projection by copying from a OGRSpatialReference.     </td>
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<a class="anchor" name="74319ac3b6fa6e2f11009bfbc9fb6b54"></a><!-- doxytag: member="vtProjection::SetTextDescription" ref="74319ac3b6fa6e2f11009bfbc9fb6b54" args="(const char *type, const char *value)" --><p>
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          <td class="md" nowrap valign="top">bool vtProjection::SetTextDescription           </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top">const char *&nbsp;</td>
          <td class="mdname" nowrap> <em>type</em>, </td>
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          <td class="md"></td>
          <td class="md" nowrap>const char *&nbsp;</td>
          <td class="mdname" nowrap> <em>value</em></td>
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          <td class="md">)&nbsp;</td>
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<p>
Set the projection using a text description.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
  <table border="0" cellspacing="2" cellpadding="0">
    <tr><td valign="top"></td><td valign="top"><em>type</em>&nbsp;</td><td>The type of description, either "simple" for short simple string, or "wkt" for a full-length WKT (Well-Known Text) description.</td></tr>
    <tr><td valign="top"></td><td valign="top"><em>value</em>&nbsp;</td><td>The description itself. A WKT description should be a single string, with no extra whitespace. A simple string can have the following forms:<ul>
<li>geo, datum D</li><li>utm, datum D, zone Z</li></ul>
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<dl compact><dt><b>Example:</b></dt><dd><div class="fragment"><pre class="fragment">    proj.SetTextDescription(<span class="stringliteral">"simple"</span>, <span class="stringliteral">"utm, datum WGS_84, zone 11"</span>);
</pre></div> </dd></dl>
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<a class="anchor" name="530f529e2a0152eea2e03f3b5165942e"></a><!-- doxytag: member="vtProjection::SetUTMZone" ref="530f529e2a0152eea2e03f3b5165942e" args="(int iZone)" --><p>
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          <td class="md" nowrap valign="top">void vtProjection::SetUTMZone           </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top">int&nbsp;</td>
          <td class="mdname1" valign="top" nowrap> <em>iZone</em>          </td>
          <td class="md" valign="top">&nbsp;)&nbsp;</td>
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<p>
Get the UTM zone of the projection.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
  <table border="0" cellspacing="2" cellpadding="0">
    <tr><td valign="top"></td><td valign="top"><em>iZone</em>&nbsp;</td><td>Should be one of the following values:<ul>
<li>1 through 60 for the northern hemisphere</li><li>-1 through -60 for the southern hemisphere </li></ul>
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<a class="anchor" name="12ba5c50c8136299ab6c9b1bbac8d964"></a><!-- doxytag: member="vtProjection::WriteProjFile" ref="12ba5c50c8136299ab6c9b1bbac8d964" args="(const char *filename) const " --><p>
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          <td class="md" nowrap valign="top">bool vtProjection::WriteProjFile           </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top">const char *&nbsp;</td>
          <td class="mdname1" valign="top" nowrap> <em>filename</em>          </td>
          <td class="md" valign="top">&nbsp;)&nbsp;</td>
          <td class="md" nowrap> const</td>
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<p>
Write the projection to a .prj file.<p>
<dl compact><dt><b>Returns:</b></dt><dd>true if successful. </dd></dl>
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