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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

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<CODE>static&nbsp;<A HREF="http://www.jump-project.org/docs/jts/1.7/api/com/vividsolutions/jts/geom/Envelope.html" title="class or interface in com.vividsolutions.jts.geom">Envelope</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/geotools/geometry/jts/JTS.html#toGeographic(com.vividsolutions.jts.geom.Envelope, org.opengis.referencing.crs.CoordinateReferenceSystem)">toGeographic</A></B>(<A HREF="http://www.jump-project.org/docs/jts/1.7/api/com/vividsolutions/jts/geom/Envelope.html" title="class or interface in com.vividsolutions.jts.geom">Envelope</A>&nbsp;envelope,
             CoordinateReferenceSystem&nbsp;crs)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Transforms the envelope from its current crs to WGS84 coordinate reference system.
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<CODE>static&nbsp;<A HREF="http://www.jump-project.org/docs/jts/1.7/api/com/vividsolutions/jts/geom/Coordinate.html" title="class or interface in com.vividsolutions.jts.geom">Coordinate</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/geotools/geometry/jts/JTS.html#transform(com.vividsolutions.jts.geom.Coordinate, com.vividsolutions.jts.geom.Coordinate, org.opengis.referencing.operation.MathTransform)">transform</A></B>(<A HREF="http://www.jump-project.org/docs/jts/1.7/api/com/vividsolutions/jts/geom/Coordinate.html" title="class or interface in com.vividsolutions.jts.geom">Coordinate</A>&nbsp;source,
          <A HREF="http://www.jump-project.org/docs/jts/1.7/api/com/vividsolutions/jts/geom/Coordinate.html" title="class or interface in com.vividsolutions.jts.geom">Coordinate</A>&nbsp;dest,
          MathTransform&nbsp;transform)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Transforms the coordinate using the provided math transform.</TD>
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<CODE>static&nbsp;<A HREF="http://www.jump-project.org/docs/jts/1.7/api/com/vividsolutions/jts/geom/Envelope.html" title="class or interface in com.vividsolutions.jts.geom">Envelope</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/geotools/geometry/jts/JTS.html#transform(com.vividsolutions.jts.geom.Envelope, com.vividsolutions.jts.geom.Envelope, org.opengis.referencing.operation.MathTransform, int)">transform</A></B>(<A HREF="http://www.jump-project.org/docs/jts/1.7/api/com/vividsolutions/jts/geom/Envelope.html" title="class or interface in com.vividsolutions.jts.geom">Envelope</A>&nbsp;sourceEnvelope,
          <A HREF="http://www.jump-project.org/docs/jts/1.7/api/com/vividsolutions/jts/geom/Envelope.html" title="class or interface in com.vividsolutions.jts.geom">Envelope</A>&nbsp;targetEnvelope,
          MathTransform&nbsp;transform,
          int&nbsp;npoints)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Transforms the densified envelope using the specified math transform.
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<CODE>static&nbsp;<A HREF="http://www.jump-project.org/docs/jts/1.7/api/com/vividsolutions/jts/geom/Envelope.html" title="class or interface in com.vividsolutions.jts.geom">Envelope</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/geotools/geometry/jts/JTS.html#transform(com.vividsolutions.jts.geom.Envelope, org.opengis.referencing.operation.MathTransform)">transform</A></B>(<A HREF="http://www.jump-project.org/docs/jts/1.7/api/com/vividsolutions/jts/geom/Envelope.html" title="class or interface in com.vividsolutions.jts.geom">Envelope</A>&nbsp;envelope,
          MathTransform&nbsp;transform)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Transforms the envelope using the specified math transform.</TD>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static&nbsp;<A HREF="http://www.jump-project.org/docs/jts/1.7/api/com/vividsolutions/jts/geom/Geometry.html" title="class or interface in com.vividsolutions.jts.geom">Geometry</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/geotools/geometry/jts/JTS.html#transform(com.vividsolutions.jts.geom.Geometry, org.opengis.referencing.operation.MathTransform)">transform</A></B>(<A HREF="http://www.jump-project.org/docs/jts/1.7/api/com/vividsolutions/jts/geom/Geometry.html" title="class or interface in com.vividsolutions.jts.geom">Geometry</A>&nbsp;geom,
          MathTransform&nbsp;transform)</CODE>

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Transforms the geometry using the default transformer.</TD>
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<CODE>static&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/geotools/geometry/jts/JTS.html#xform(org.opengis.referencing.operation.MathTransform, double[], double[])">xform</A></B>(MathTransform&nbsp;transform,
      double[]&nbsp;src,
      double[]&nbsp;dest)</CODE>

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Like a transform but eXtreme!

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<TD><B>Methods inherited from class <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A></B></TD>
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<TD><CODE><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html#clone()" title="class or interface in java.lang">clone</A>, <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html#equals(java.lang.Object)" title="class or interface in java.lang">equals</A>, <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html#finalize()" title="class or interface in java.lang">finalize</A>, <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html#getClass()" title="class or interface in java.lang">getClass</A>, <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html#hashCode()" title="class or interface in java.lang">hashCode</A>, <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html#notify()" title="class or interface in java.lang">notify</A>, <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html#notifyAll()" title="class or interface in java.lang">notifyAll</A>, <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html#toString()" title="class or interface in java.lang">toString</A>, <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html#wait()" title="class or interface in java.lang">wait</A>, <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html#wait(long)" title="class or interface in java.lang">wait</A>, <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html#wait(long, int)" title="class or interface in java.lang">wait</A></CODE></TD>
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<B>Method Detail</B></FONT></TD>
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<A NAME="transform(com.vividsolutions.jts.geom.Envelope, org.opengis.referencing.operation.MathTransform)"><!-- --></A><H3>
transform</H3>
<PRE>
public static <A HREF="http://www.jump-project.org/docs/jts/1.7/api/com/vividsolutions/jts/geom/Envelope.html" title="class or interface in com.vividsolutions.jts.geom">Envelope</A> <B>transform</B>(<A HREF="http://www.jump-project.org/docs/jts/1.7/api/com/vividsolutions/jts/geom/Envelope.html" title="class or interface in com.vividsolutions.jts.geom">Envelope</A>&nbsp;envelope,
                                 MathTransform&nbsp;transform)
                          throws TransformException</PRE>
<DL>
<DD>Transforms the envelope using the specified math transform.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>envelope</CODE> - The envelope to transform.<DD><CODE>transform</CODE> - The transform to use.
<DT><B>Returns:</B><DD>The transformed Envelope
<DT><B>Throws:</B>
<DD><CODE>TransformException</CODE> - if at least one coordinate can't be transformed.</DL>
</DD>
</DL>
<HR>

<A NAME="transform(com.vividsolutions.jts.geom.Envelope, com.vividsolutions.jts.geom.Envelope, org.opengis.referencing.operation.MathTransform, int)"><!-- --></A><H3>
transform</H3>
<PRE>
public static <A HREF="http://www.jump-project.org/docs/jts/1.7/api/com/vividsolutions/jts/geom/Envelope.html" title="class or interface in com.vividsolutions.jts.geom">Envelope</A> <B>transform</B>(<A HREF="http://www.jump-project.org/docs/jts/1.7/api/com/vividsolutions/jts/geom/Envelope.html" title="class or interface in com.vividsolutions.jts.geom">Envelope</A>&nbsp;sourceEnvelope,
                                 <A HREF="http://www.jump-project.org/docs/jts/1.7/api/com/vividsolutions/jts/geom/Envelope.html" title="class or interface in com.vividsolutions.jts.geom">Envelope</A>&nbsp;targetEnvelope,
                                 MathTransform&nbsp;transform,
                                 int&nbsp;npoints)
                          throws TransformException</PRE>
<DL>
<DD>Transforms the densified envelope using the specified math transform.
 The envelope is densified (extra points put around the outside edge)
 to provide a better new envelope for high deformed situations.
 <p>
 If an optional target envelope is provided, this envelope will be
 <A HREF="http://www.jump-project.org/docs/jts/1.7/api/com/vividsolutions/jts/geom/Envelope.html#expandToInclude(com.vividsolutions.jts.geom.Coordinate)" title="class or interface in com.vividsolutions.jts.geom">expanded</A> with the transformation result. It will
 <strong>not</strong> be <A HREF="http://www.jump-project.org/docs/jts/1.7/api/com/vividsolutions/jts/geom/Envelope.html#setToNull()" title="class or interface in com.vividsolutions.jts.geom">nullified</A> before the expansion.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>sourceEnvelope</CODE> - The envelope to transform.<DD><CODE>targetEnvelope</CODE> - An envelope to expand with the transformation result, or 
                         for returning an new envelope.<DD><CODE>transform</CODE> - The transform to use.<DD><CODE>npoints</CODE> - Densification of each side of the rectange.
<DT><B>Returns:</B><DD> if it was non-null, or a new envelope otherwise.
         In all case, the returned envelope fully contains the transformed envelope.
<DT><B>Throws:</B>
<DD><CODE>TransformException</CODE> - if a coordinate can't be transformed.</DL>
</DD>
</DL>
<HR>

<A NAME="transform(com.vividsolutions.jts.geom.Geometry, org.opengis.referencing.operation.MathTransform)"><!-- --></A><H3>
transform</H3>
<PRE>
public static <A HREF="http://www.jump-project.org/docs/jts/1.7/api/com/vividsolutions/jts/geom/Geometry.html" title="class or interface in com.vividsolutions.jts.geom">Geometry</A> <B>transform</B>(<A HREF="http://www.jump-project.org/docs/jts/1.7/api/com/vividsolutions/jts/geom/Geometry.html" title="class or interface in com.vividsolutions.jts.geom">Geometry</A>&nbsp;geom,
                                 MathTransform&nbsp;transform)
                          throws MismatchedDimensionException,
                                 TransformException</PRE>
<DL>
<DD>Transforms the geometry using the default transformer.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>geom</CODE> - The geom to transform<DD><CODE>transform</CODE> - the transform to use during the transformation.
<DT><B>Returns:</B><DD>the transformed geometry.  It will be a new geometry.
<DT><B>Throws:</B>
<DD><CODE>MismatchedDimensionException</CODE> - if the geometry doesn't have the expected dimension
         for the specified transform.
<DD><CODE>TransformException</CODE> - if a point can't be transformed.</DL>
</DD>
</DL>
<HR>

<A NAME="transform(com.vividsolutions.jts.geom.Coordinate, com.vividsolutions.jts.geom.Coordinate, org.opengis.referencing.operation.MathTransform)"><!-- --></A><H3>
transform</H3>
<PRE>
public static <A HREF="http://www.jump-project.org/docs/jts/1.7/api/com/vividsolutions/jts/geom/Coordinate.html" title="class or interface in com.vividsolutions.jts.geom">Coordinate</A> <B>transform</B>(<A HREF="http://www.jump-project.org/docs/jts/1.7/api/com/vividsolutions/jts/geom/Coordinate.html" title="class or interface in com.vividsolutions.jts.geom">Coordinate</A>&nbsp;source,
                                   <A HREF="http://www.jump-project.org/docs/jts/1.7/api/com/vividsolutions/jts/geom/Coordinate.html" title="class or interface in com.vividsolutions.jts.geom">Coordinate</A>&nbsp;dest,
                                   MathTransform&nbsp;transform)
                            throws TransformException</PRE>
<DL>
<DD>Transforms the coordinate using the provided math transform.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>source</CODE> - the source coordinate that will be transformed<DD><CODE>dest</CODE> - the coordinate that will be set.  May be null or the source coordinate
        (or new coordinate of course).
<DT><B>Returns:</B><DD>the destination coordinate if not null or a new Coordinate.
<DT><B>Throws:</B>
<DD><CODE>TransformException</CODE> - if the coordinate can't be transformed.</DL>
</DD>
</DL>
<HR>

<A NAME="toGeographic(com.vividsolutions.jts.geom.Envelope, org.opengis.referencing.crs.CoordinateReferenceSystem)"><!-- --></A><H3>
toGeographic</H3>
<PRE>
public static <A HREF="http://www.jump-project.org/docs/jts/1.7/api/com/vividsolutions/jts/geom/Envelope.html" title="class or interface in com.vividsolutions.jts.geom">Envelope</A> <B>toGeographic</B>(<A HREF="http://www.jump-project.org/docs/jts/1.7/api/com/vividsolutions/jts/geom/Envelope.html" title="class or interface in com.vividsolutions.jts.geom">Envelope</A>&nbsp;envelope,
                                    CoordinateReferenceSystem&nbsp;crs)
                             throws TransformException</PRE>
<DL>
<DD>Transforms the envelope from its current crs to WGS84 coordinate reference system.
 If the specified envelope is already in WGS84, then it is returned unchanged.