classgdalrasterattributetable.html

gdal库的学习文档

  <table border="0" cellspacing="2" cellpadding="0">
    <tr><td valign="top"></td><td valign="top"><em>iRow</em>&nbsp;</td><td>row to fetch (zero based). </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>iField</em>&nbsp;</td><td>column to fetch (zero based).</td></tr>
  </table>
</dl>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>field value </dd></dl>

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<a class="anchor" name="71b0d63f1991f300a88e1b0b95024a44"></a><!-- doxytag: member="GDALRasterAttributeTable::SetValue" ref="71b0d63f1991f300a88e1b0b95024a44" args="(int iRow, int iField, const char *pszValue)" -->
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          <td class="memname">void GDALRasterAttributeTable::SetValue           </td>
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          <td class="paramtype">int&nbsp;</td>
          <td class="paramname"> <em>iRow</em>, </td>
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          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">int&nbsp;</td>
          <td class="paramname"> <em>iField</em>, </td>
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          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">const char *&nbsp;</td>
          <td class="paramname"> <em>pszValue</em></td><td>&nbsp;</td>
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<p>
Set field value from string. 
<p>
The indicated field (column) on the indicated row is set from the passed value. The value will be automatically converted for other field types, with a possible loss of precision.<p>
This method is the same as the C function GDALRATSetValueAsString().<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>iRow</em>&nbsp;</td><td>row to fetch (zero based). </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>iField</em>&nbsp;</td><td>column to fetch (zero based). </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>pszValue</em>&nbsp;</td><td>the value to assign. </td></tr>
  </table>
</dl>

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<a class="anchor" name="b76d4a92ff58fd4dd4ce3ccc6006927f"></a><!-- doxytag: member="GDALRasterAttributeTable::SetValue" ref="b76d4a92ff58fd4dd4ce3ccc6006927f" args="(int iRow, int iField, double dfValue)" -->
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          <td class="memname">void GDALRasterAttributeTable::SetValue           </td>
          <td>(</td>
          <td class="paramtype">int&nbsp;</td>
          <td class="paramname"> <em>iRow</em>, </td>
        </tr>
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          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">int&nbsp;</td>
          <td class="paramname"> <em>iField</em>, </td>
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          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">double&nbsp;</td>
          <td class="paramname"> <em>dfValue</em></td><td>&nbsp;</td>
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<p>
Set field value from double. 
<p>
The indicated field (column) on the indicated row is set from the passed value. The value will be automatically converted for other field types, with a possible loss of precision.<p>
This method is the same as the C function GDALRATSetValueAsDouble().<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>iRow</em>&nbsp;</td><td>row to fetch (zero based). </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>iField</em>&nbsp;</td><td>column to fetch (zero based). </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>dfValue</em>&nbsp;</td><td>the value to assign. </td></tr>
  </table>
</dl>

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<a class="anchor" name="e500398b7acd98a7630a51028387ba04"></a><!-- doxytag: member="GDALRasterAttributeTable::SetValue" ref="e500398b7acd98a7630a51028387ba04" args="(int iRow, int iField, int nValue)" -->
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          <td class="memname">void GDALRasterAttributeTable::SetValue           </td>
          <td>(</td>
          <td class="paramtype">int&nbsp;</td>
          <td class="paramname"> <em>iRow</em>, </td>
        </tr>
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          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">int&nbsp;</td>
          <td class="paramname"> <em>iField</em>, </td>
        </tr>
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          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">int&nbsp;</td>
          <td class="paramname"> <em>nValue</em></td><td>&nbsp;</td>
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          <td>)</td>
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<p>
Set field value from integer. 
<p>
The indicated field (column) on the indicated row is set from the passed value. The value will be automatically converted for other field types, with a possible loss of precision.<p>
This method is the same as the C function GDALRATSetValueAsInteger().<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>iRow</em>&nbsp;</td><td>row to fetch (zero based). </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>iField</em>&nbsp;</td><td>column to fetch (zero based). </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>nValue</em>&nbsp;</td><td>the value to assign. </td></tr>
  </table>
</dl>

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<a class="anchor" name="5f108000de7f8ace1a4eb4f015ac3b5f"></a><!-- doxytag: member="GDALRasterAttributeTable::SetRowCount" ref="5f108000de7f8ace1a4eb4f015ac3b5f" args="(int iCount)" -->
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          <td class="memname">void GDALRasterAttributeTable::SetRowCount           </td>
          <td>(</td>
          <td class="paramtype">int&nbsp;</td>
          <td class="paramname"> <em>nNewCount</em>          </td>
          <td>&nbsp;)&nbsp;</td>
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<p>
Set row count. 
<p>
Resizes the table to include the indicated number of rows. Newly created rows will be initialized to their default values - "" for strings, and zero for numeric fields.<p>
This method is the same as the C function GDALRATSetRowCount().<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>nNewCount</em>&nbsp;</td><td>the new number of rows. </td></tr>
  </table>
</dl>

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<a class="anchor" name="a7c68ff1867e87fe5986f38655fa7d32"></a><!-- doxytag: member="GDALRasterAttributeTable::GetRowOfValue" ref="a7c68ff1867e87fe5986f38655fa7d32" args="(double dfValue) const " -->
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          <td class="memname">int GDALRasterAttributeTable::GetRowOfValue           </td>
          <td>(</td>
          <td class="paramtype">double&nbsp;</td>
          <td class="paramname"> <em>dfValue</em>          </td>
          <td>&nbsp;)&nbsp;</td>
          <td width="100%"> const</td>
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<p>
Get row for pixel value. 
<p>
Given a raw pixel value, the raster attribute table is scanned to determine which row in the table applies to the pixel value. The row index is returned.<p>
This method is the same as the C function GDALRATGetRowOfValue().<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>dfValue</em>&nbsp;</td><td>the pixel value.</td></tr>
  </table>
</dl>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>the row index or -1 if no row is appropriate. </dd></dl>

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<a class="anchor" name="2a4f7248c0e37e217b1d6423c538123e"></a><!-- doxytag: member="GDALRasterAttributeTable::CreateColumn" ref="2a4f7248c0e37e217b1d6423c538123e" args="(const char *pszFieldName, GDALRATFieldType eFieldType, GDALRATFieldUsage eFieldUsage)" -->
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          <td class="memname">CPLErr GDALRasterAttributeTable::CreateColumn           </td>
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          <td class="paramtype">const char *&nbsp;</td>
          <td class="paramname"> <em>pszFieldName</em>, </td>
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