classvtprojection.html

VC下实现图像处理。 VC下实现图像处理。 VC下实现图像处理。

<p>
Get the projection as a text description. If the projection is Geographic or UTM, then a "simple" type string will be returned. For all other projection types, a WKT string is returned.<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>A string buffer to contain the type of description. This buffer should be at least 7 characters long to contain either the word "simple" or "wkt".</td></tr>
    <tr><td valign="top"></td><td valign="top"><em>value</em>&nbsp;</td><td>A string buffer to contain the full description. This buffer should be at least 2048 characters long to contain either a simple or WKT description. </td></tr>
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<a class="anchor" name="ac9bf92d8cb40bea4617896148677b11"></a><!-- doxytag: member="vtProjection::GetUnits" ref="ac9bf92d8cb40bea4617896148677b11" args="() const " --><p>
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          <td class="md" nowrap valign="top">LinearUnits vtProjection::GetUnits           </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="mdname1" valign="top" nowrap>          </td>
          <td class="md" valign="top">&nbsp;)&nbsp;</td>
          <td class="md" nowrap> const</td>
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<p>
Return the kind of horizontal units used by the projection. This is also called "linear units."<p>
<dl compact><dt><b>Returns:</b></dt><dd><ul>
<li>LU_DEGREES - Arc Degrees</li><li>LU_METERS - Meters</li><li>LU_FEET_INT - Feet (International Foot)</li><li>LU_FEET_US - Feet (U.S. Survey Foot) </li></ul>
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<a class="anchor" name="c512de92d741ac8afdabeae997ed989d"></a><!-- doxytag: member="vtProjection::GetUTMZone" ref="c512de92d741ac8afdabeae997ed989d" args="() const " --><p>
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          <td class="md" nowrap valign="top">int vtProjection::GetUTMZone           </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="mdname1" valign="top" nowrap>          </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>Returns:</b></dt><dd><ul>
<li>1 through 60 in the northern hemisphere</li></ul>
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<ul>
<li>-1 through -60 for the southern hemisphere</li><li>0 if the projection is not UTM </li></ul>
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<a class="anchor" name="a81d22a5163a78c932ee90761ebb8af6"></a><!-- doxytag: member="vtProjection::GuessEPSGCode" ref="a81d22a5163a78c932ee90761ebb8af6" args="() const " --><p>
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          <td class="md" nowrap valign="top">int vtProjection::GuessEPSGCode           </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="mdname1" valign="top" nowrap>          </td>
          <td class="md" valign="top">&nbsp;)&nbsp;</td>
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<p>
Try to determine the EPSG code that corresponds to the current projection. This important capability is mysteriously absent from the underlying libraries (OGR, PROJ.4) so it is implemented here.<p>
<dl compact><dt><b>Returns:</b></dt><dd>An EPSG coordinate system code, or -1 if it couldn't be guessed. </dd></dl>
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<a class="anchor" name="ded1c5b2449aefb575ef928eb2347bbe"></a><!-- doxytag: member="vtProjection::operator!=" ref="ded1c5b2449aefb575ef928eb2347bbe" args="(const vtProjection &amp;ref) const " --><p>
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          <td class="md" nowrap valign="top">bool vtProjection::operator!=           </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top">const <a class="el" href="classvtProjection.html">vtProjection</a> &amp;&nbsp;</td>
          <td class="mdname1" valign="top" nowrap> <em>ref</em>          </td>
          <td class="md" valign="top">&nbsp;)&nbsp;</td>
          <td class="md" nowrap> const</td>
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<p>
Inequality operator.     </td>
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<a class="anchor" name="a6cc3788a48c4b1fc74e4f1d833422a9"></a><!-- doxytag: member="vtProjection::operator=" ref="a6cc3788a48c4b1fc74e4f1d833422a9" args="(const vtProjection &amp;ref)" --><p>
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          <td class="md" nowrap valign="top"><a class="el" href="classvtProjection.html">vtProjection</a> &amp; vtProjection::operator=           </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top">const <a class="el" href="classvtProjection.html">vtProjection</a> &amp;&nbsp;</td>
          <td class="mdname1" valign="top" nowrap> <em>ref</em>          </td>
          <td class="md" valign="top">&nbsp;)&nbsp;</td>
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Assignment operator.     </td>
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<a class="anchor" name="f128c88e4c3dadf4bbf478c45f4b3ab8"></a><!-- doxytag: member="vtProjection::operator==" ref="f128c88e4c3dadf4bbf478c45f4b3ab8" args="(const vtProjection &amp;ref) const " --><p>
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          <td class="md" nowrap valign="top">bool vtProjection::operator==           </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top">const <a class="el" href="classvtProjection.html">vtProjection</a> &amp;&nbsp;</td>
          <td class="mdname1" valign="top" nowrap> <em>ref</em>          </td>
          <td class="md" valign="top">&nbsp;)&nbsp;</td>
          <td class="md" nowrap> const</td>
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Equality operator.     </td>
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<a class="anchor" name="38ec7ac473e159b0a6d5e6100854e631"></a><!-- doxytag: member="vtProjection::ReadProjFile" ref="38ec7ac473e159b0a6d5e6100854e631" args="(const char *filename)" --><p>
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          <td class="md" nowrap valign="top">bool vtProjection::ReadProjFile           </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>
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<p>
Read the projection from a .prj file.<p>
If the filename does not have the file extension ".prj", this method will look for a file which has the same name with a ".prj" extension.<p>
<dl compact><dt><b>Returns:</b></dt><dd>true if successful. </dd></dl>
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<a class="anchor" name="9ce80cb71e2a57a65559a6a6ca9ffef4"></a><!-- doxytag: member="vtProjection::SetDatum" ref="9ce80cb71e2a57a65559a6a6ca9ffef4" args="(int iDatum)" --><p>
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          <td class="md" nowrap valign="top">OGRErr vtProjection::SetDatum           </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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