gradientmagnitude.html

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

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<B>Constructor Detail</B></FONT></TD>
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<A NAME="GradientMagnitude()"><!-- --></A><H3>
GradientMagnitude</H3>
<PRE>
public <B>GradientMagnitude</B>()</PRE>
<DL>
<DD>Constructs a default gradient magnitude operation.
<P>
</DL>

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<B>Method Detail</B></FONT></TD>
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<A NAME="deriveGridCoverage(org.geotools.coverage.grid.GridCoverage2D[], org.geotools.coverage.processing.OperationJAI.Parameters)"><!-- --></A><H3>
deriveGridCoverage</H3>
<PRE>
protected <A HREF="../../../../../org/geotools/coverage/grid/GridCoverage2D.html" title="class in org.geotools.coverage.grid">GridCoverage2D</A> <B>deriveGridCoverage</B>(<A HREF="../../../../../org/geotools/coverage/grid/GridCoverage2D.html" title="class in org.geotools.coverage.grid">GridCoverage2D</A>[]&nbsp;sources,
                                            <A HREF="../../../../../org/geotools/coverage/processing/OperationJAI.Parameters.html" title="class in org.geotools.coverage.processing">OperationJAI.Parameters</A>&nbsp;parameters)</PRE>
<DL>
<DD>Applies the operation on grid coverage. The default implementation looks for kernels
 specified in the <A HREF="../../../../../org/geotools/coverage/processing/OperationJAI.Parameters.html#parameters"><CODE>parameter block</CODE></A> and divide them by the distance between pixels, in the grid coverage's
 coordinate reference system.
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../../org/geotools/coverage/processing/OperationJAI.html#deriveGridCoverage(org.geotools.coverage.grid.GridCoverage2D[], org.geotools.coverage.processing.OperationJAI.Parameters)">deriveGridCoverage</A></CODE> in class <CODE><A HREF="../../../../../org/geotools/coverage/processing/OperationJAI.html" title="class in org.geotools.coverage.processing">OperationJAI</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>sources</CODE> - The source coverages.<DD><CODE>parameters</CODE> - Parameters, rendering hints and coordinate reference system to use.
<DT><B>Returns:</B><DD>The result as a grid coverage.<DT><B>See Also:</B><DD><A HREF="../../../../../org/geotools/coverage/processing/OperationJAI.html#doOperation(org.opengis.parameter.ParameterValueGroup, org.geotools.factory.Hints)"><CODE>OperationJAI.doOperation(org.opengis.parameter.ParameterValueGroup, org.geotools.factory.Hints)</CODE></A>, 
<A HREF="../../../../../org/geotools/coverage/processing/OperationJAI.html#deriveSampleDimension(org.geotools.coverage.GridSampleDimension[][], org.geotools.coverage.processing.OperationJAI.Parameters)"><CODE>OperationJAI.deriveSampleDimension(org.geotools.coverage.GridSampleDimension[][], org.geotools.coverage.processing.OperationJAI.Parameters)</CODE></A>, 
<A HREF="http://java.sun.com/products/java-media/jai/forDevelopers/jai-apidocs/javax/media/jai/JAI.html#createNS(java.lang.String, java.awt.image.renderable.ParameterBlock, java.awt.RenderingHints)" title="class or interface in javax.media.jai"><CODE>JAI.createNS(java.lang.String, java.awt.image.renderable.ParameterBlock, java.awt.RenderingHints)</CODE></A></DL>
</DD>
</DL>
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<A NAME="deriveCategory(org.geotools.coverage.Category[], org.geotools.coverage.processing.OperationJAI.Parameters)"><!-- --></A><H3>
deriveCategory</H3>
<PRE>
protected <A HREF="../../../../../org/geotools/coverage/Category.html" title="class in org.geotools.coverage">Category</A> <B>deriveCategory</B>(<A HREF="../../../../../org/geotools/coverage/Category.html" title="class in org.geotools.coverage">Category</A>[]&nbsp;categories,
                                  <A HREF="../../../../../org/geotools/coverage/processing/OperationJAI.Parameters.html" title="class in org.geotools.coverage.processing">OperationJAI.Parameters</A>&nbsp;parameters)</PRE>
<DL>
<DD>Derives the quantitative category for a band in the destination image.
 This implementation computes the expected gradient range from the two
 masks and the value range in the source grid coverage.
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../../org/geotools/coverage/processing/OperationJAI.html#deriveCategory(org.geotools.coverage.Category[], org.geotools.coverage.processing.OperationJAI.Parameters)">deriveCategory</A></CODE> in class <CODE><A HREF="../../../../../org/geotools/coverage/processing/OperationJAI.html" title="class in org.geotools.coverage.processing">OperationJAI</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>categories</CODE> - The quantitative categories from every sources. For unary operations
         like , this array has a length of 1. For binary
         operations like  and , this array has a length of 2.<DD><CODE>parameters</CODE> - Parameters, rendering hints and coordinate reference system to use.
<DT><B>Returns:</B><DD>The quantative category to use in the destination image, or  if unknow.</DL>
</DD>
</DL>
<HR>

<A NAME="deriveUnit(javax.units.Unit[], org.geotools.coverage.processing.OperationJAI.Parameters)"><!-- --></A><H3>
deriveUnit</H3>
<PRE>
protected <A HREF="http://jsr-108.sourceforge.net/javadoc/javax/units/Unit.html" title="class or interface in javax.units">Unit</A> <B>deriveUnit</B>(<A HREF="http://jsr-108.sourceforge.net/javadoc/javax/units/Unit.html" title="class or interface in javax.units">Unit</A>[]&nbsp;units,
                          <A HREF="../../../../../org/geotools/coverage/processing/OperationJAI.Parameters.html" title="class in org.geotools.coverage.processing">OperationJAI.Parameters</A>&nbsp;parameters)</PRE>
<DL>
<DD>Derives the unit of data for a band in the destination image.
 This method compute / where:

 <ul>
   <li> is the sample unit in source image.</li>
   <li> is the coordinate reference system axis unit.</li>
 </ul>
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../../org/geotools/coverage/processing/OperationJAI.html#deriveUnit(javax.units.Unit[], org.geotools.coverage.processing.OperationJAI.Parameters)">deriveUnit</A></CODE> in class <CODE><A HREF="../../../../../org/geotools/coverage/processing/OperationJAI.html" title="class in org.geotools.coverage.processing">OperationJAI</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>units</CODE> - The units from every sources. For unary operations like
         , this array has a length of 1. For binary operations
         like  and , this array has a length of 2.<DD><CODE>parameters</CODE> - Parameters, rendering hints and coordinate reference system to use.
<DT><B>Returns:</B><DD>The unit of data in the destination image, or  if unknow.</DL>
</DD>
</DL>
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