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Geotools是一个开源的Java GIS工具包,可利用它来开发符合标准的地理信息系统。Geotools提供了OGC(Open Geospatial Consortium)规范的一个实现来作为他们的

    (i.e. rectangular shapes are not supported).</P>
    <P><A HREF="#operation-list">Back to summary</A></P>






    <P>&nbsp;</P>
    <HR>
    <P>&nbsp;</P>
    <H2><A NAME="MinFilter">MinFilter</A></H2>
    <P ALIGN="justify">Non-linear filter which is useful for removing isolated
    lines or pixels while preserving the overall appearance of an image. The
    filter is implemented by moving a mask over the image. For each position
    of the mask, the center pixel is replaced by the min of the pixel values
    covered by the mask.
    There are several shapes possible for the mask, which are enumerated in the
    <A HREF="http://java.sun.com/products/java-media/jai/forDevelopers/jai-apidocs/javax/media/jai/operator/MinFilterDescriptor.html" title="class or interface in javax.media.jai.operator">JAI documentation</A>.</P>

    <P><STRONG>Name:</STRONG>&nbsp;<CODE>"MinFilter"</CODE><BR>
       <STRONG>JAI operator:</STRONG>&nbsp;<CODE>"<A HREF="http://java.sun.com/products/java-media/jai/forDevelopers/jai-apidocs/javax/media/jai/operator/MinFilterDescriptor.html" title="class or interface in javax.media.jai.operator">MinFilter</A>"</CODE><BR>
       <STRONG>Parameters:</STRONG></P>
    <table border='3' cellpadding='6' bgcolor='F4F8FF'>
      <tr bgcolor='#B9DCFF'>
        <th>Name</th>
        <th>Class</th>
        <th>Default value</th>
        <th>Minimum value</th>
        <th>Maximum value</th>
      </tr>
      <tr>
        <td></td>
        <td><A HREF="../../../../org/geotools/coverage/grid/GridCoverage2D.html" title="class in org.geotools.coverage.grid"><CODE>GridCoverage2D</CODE></A></td>
        <td align="center">N/A</td>
        <td align="center">N/A</td>
        <td align="center">N/A</td>
      </tr>
      <tr>
        <td></td>
        <td><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Integer.html" title="class or interface in java.lang"><CODE>Integer</CODE></A></td>
        <td align="center">3</td>
        <td align="center">1</td>
        <td align="center">N/A</td>
      </tr>
      <tr>
        <td></td>
        <td><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Integer.html" title="class or interface in java.lang"><CODE>Integer</CODE></A></td>
        <td align="center">3</td>
        <td align="center">1</td>
        <td align="center">N/A</td>
      </tr>
      <tr>
        <td></td>
        <td><A HREF="http://java.sun.com/products/java-media/jai/forDevelopers/jai-apidocs/javax/media/jai/operator/MinFilterShape.html" title="class or interface in javax.media.jai.operator"><CODE>MinFilterShape</CODE></A></td>
        <td><A HREF="http://java.sun.com/products/java-media/jai/forDevelopers/jai-apidocs/javax/media/jai/operator/MinFilterDescriptor.html#MIN_MASK_SQUARE" title="class or interface in javax.media.jai.operator"><CODE>MinFilterDescriptor.MIN_MASK_SQUARE</CODE></A></td>
        <td align="center">N/A</td>
        <td align="center">N/A</td>
      </tr>
    </table>
    <P ALIGN="justify"><STRONG>Note:</STRONG> In current implementation,
    <code>Xsize</code> and <code>Ysize</code> must have the same value
    (i.e. rectangular shapes are not supported).</P>
    <P><A HREF="#operation-list">Back to summary</A></P>






    <P>&nbsp;</P>
    <HR>
    <P>&nbsp;</P>
    <H2><A NAME="Recolor">Recolor</A></H2>
    <P ALIGN="justify">Changes the colors associated to arbitrary
    <A HREF="../../../../org/geotools/coverage/Category.html" title="class in org.geotools.coverage">categories</A> in arbitrary bands.
    The <code>ColorMaps</code> arguments must be an array of <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/util/Map.html" title="class or interface in java.util"><CODE>Map</CODE></A>s
    with a minimal length of 1. The <code>Map</code> in array element 0 is used
    for band 0; the <code>Map</code> in array element 1 is used for band 1, etc.
    If there is more bands than array elements in <code>ColorMaps</code>, then
    the last <code>Map</code> is reused for all remaining bands.</P>

    <P ALIGN="justify">For each <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/util/Map.html" title="class or interface in java.util"><CODE>Map</CODE></A> in <code>ColorMaps</code>,
    the keys are category names as <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/String.html" title="class or interface in java.lang"><CODE>String</CODE></A> and the values are
    colors as an array of type <code><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/awt/Color.html" title="class or interface in java.awt">Color</A>[]</code>. All
    categories with a name matching a key in the <code>Map</code> will be
    <A HREF="../../../../org/geotools/coverage/Category.html#recolor(java.awt.Color[])">recolored</A> with the associated
    colors. All categories with no corresponding entries in the <code>Map</code>
    will be left unchanged. The <code>null</code> key is a special value meaning
    "any quantitative category". For example in order to repaint forest in
    green, river in blue and lets other categories unchanged, one can write:</P>

    <BLOCKQUOTE><PRE>
    Map map = new HashMap();
    map.put("Forest", new Color[]{Color.GREEN});
    map.put("River",  new Color[]{Color.BLUE });
    Map[] colorMaps = new Map[] {
        map  // <I>Use for all bands</I>
    }
    </PRE></BLOCKQUOTE>

    <P><STRONG>Name:</STRONG>&nbsp;<CODE>"Recolor"</CODE><BR>
       <STRONG>JAI operator:</STRONG>&nbsp;N/A<BR>
       <STRONG>Parameters:</STRONG></P>
    <table border='3' cellpadding='6' bgcolor='F4F8FF'>
      <tr bgcolor='#B9DCFF'>
        <th>Name</th>
        <th>Class</th>
        <th>Default value</th>
        <th>Minimum value</th>
        <th>Maximum value</th>
      </tr>
      <tr>
        <td></td>
        <td><A HREF="../../../../org/geotools/coverage/grid/GridCoverage2D.html" title="class in org.geotools.coverage.grid"><CODE>GridCoverage2D</CODE></A></td>
        <td align="center">N/A</td>
        <td align="center">N/A</td>
        <td align="center">N/A</td>
      </tr>
      <tr>
        <td></td>
        <td><code><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/util/Map.html" title="class or interface in java.util">Map</A>[]</code></td>
        <td align="center">A gray scale</td>
        <td align="center">N/A</td>
        <td align="center">N/A</td>
      </tr>
    </table>
    <P><A HREF="#operation-list">Back to summary</A></P>






    <P>&nbsp;</P>
    <HR>
    <P>&nbsp;</P>
    <H2><A NAME="Threshold">Threshold</A></H2>
    <P ALIGN="justify">A gray scale threshold classifies the grid coverage values
    into a boolean value. The sample dimensions will be modified into a boolean
    value and the dimension type of the source sample dimension will be represented
    as 1 bit.</P>

    <P><STRONG>Name:</STRONG>&nbsp;<CODE>"Threshold"</CODE><BR>
       <STRONG>JAI operator:</STRONG>&nbsp;<CODE>"<A HREF="http://java.sun.com/products/java-media/jai/forDevelopers/jai-apidocs/javax/media/jai/operator/BinarizeDescriptor.html" title="class or interface in javax.media.jai.operator">Binarize</A>"</CODE><BR>
       <STRONG>Parameters:</STRONG></P>
    <table border='3' cellpadding='6' bgcolor='F4F8FF'>
      <tr bgcolor='#B9DCFF'>
        <th>Name</th>
        <th>Class</th>
        <th>Default value</th>
        <th>Minimum value</th>
        <th>Maximum value</th>
      </tr>
      <tr>
        <td></td>
        <td><A HREF="../../../../org/geotools/coverage/grid/GridCoverage2D.html" title="class in org.geotools.coverage.grid"><CODE>GridCoverage2D</CODE></A></td>
        <td align="center">N/A</td>
        <td align="center">N/A</td>
        <td align="center">N/A</td>
      </tr>
      <tr>
        <td></td>
        <td></td>
        <td align="center">N/A</td>
        <td align="center">N/A</td>
        <td align="center">N/A</td>
      </tr>
    </table>
    <P><A HREF="#operation-list">Back to summary</A></P>
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