coveragestack.element.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>Method Detail</B></FONT></TD>
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<A NAME="getName()"><!-- --></A><H3>
getName</H3>
<PRE>
public <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/String.html" title="class or interface in java.lang">String</A> <B>getName</B>()
               throws <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/io/IOException.html" title="class or interface in java.io">IOException</A></PRE>
<DL>
<DD>Returns a name for the coverage. This method should not load a large amount of data,
 since it may be invoked soon. This method is invoked just before <A HREF="../../../org/geotools/coverage/CoverageStack.Element.html#getCoverage(org.geotools.image.io.IIOListeners)"><CODE>getCoverage(org.geotools.image.io.IIOListeners)</CODE></A>
 in order to log a "Loading data..." message.
<P>
<DD><DL>

<DT><B>Throws:</B>
<DD><CODE><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/io/IOException.html" title="class or interface in java.io">IOException</A></CODE></DL>
</DD>
</DL>
<HR>

<A NAME="getZRange()"><!-- --></A><H3>
getZRange</H3>
<PRE>
public <A HREF="../../../org/geotools/util/NumberRange.html" title="class in org.geotools.util">NumberRange</A> <B>getZRange</B>()
                      throws <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/io/IOException.html" title="class or interface in java.io">IOException</A></PRE>
<DL>
<DD>Returns the minimum and maximum <var>z</var> value for the coverage.
 This information is mandatory. This method should not load a large
 amount of data, since it may be invoked soon. Note that this method
 may be invoked often, so it should be efficient.
<P>
<DD><DL>

<DT><B>Throws:</B>
<DD><CODE><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/io/IOException.html" title="class or interface in java.io">IOException</A></CODE> - if an I/O operation was required but failed.</DL>
</DD>
</DL>
<HR>

<A NAME="getEnvelope()"><!-- --></A><H3>
getEnvelope</H3>
<PRE>
public Envelope <B>getEnvelope</B>()
                                                        throws <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/io/IOException.html" title="class or interface in java.io">IOException</A></PRE>
<DL>
<DD>Returns the coverage envelope, or  if this information is too expensive to
 compute. The envelope may or may not contains an extra dimension for the
 <A HREF="../../../org/geotools/coverage/CoverageStack.Element.html#getZRange()">range of z values</A>, since the <A HREF="../../../org/geotools/coverage/CoverageStack.html" title="class in org.geotools.coverage"><CODE>CoverageStack</CODE></A> class is
 tolerant in this regard. This method should not load a large amount of data, since it
 may be invoked soon.
<P>
<DD><DL>

<DT><B>Throws:</B>
<DD><CODE><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/io/IOException.html" title="class or interface in java.io">IOException</A></CODE> - if an I/O operation was required but failed.</DL>
</DD>
</DL>
<HR>

<A NAME="getGridGeometry()"><!-- --></A><H3>
getGridGeometry</H3>
<PRE>
public GridGeometry <B>getGridGeometry</B>()
                                                       throws <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/io/IOException.html" title="class or interface in java.io">IOException</A></PRE>
<DL>
<DD>The coverage grid geometry, or  if this information do not applies or is too
 expensive to compute. This method should not load a large amount of data, since it may be
 invoked soon.
<P>
<DD><DL>

<DT><B>Throws:</B>
<DD><CODE><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/io/IOException.html" title="class or interface in java.io">IOException</A></CODE> - if an I/O operation was required but failed.</DL>
</DD>
</DL>
<HR>

<A NAME="getSampleDimensions()"><!-- --></A><H3>
getSampleDimensions</H3>
<PRE>
public SampleDimension[] <B>getSampleDimensions</B>()
                                                           throws <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/io/IOException.html" title="class or interface in java.io">IOException</A></PRE>
<DL>
<DD>The sample dimension for the coverage, or  if this information is too
 expensive to compute. This method should not load a large amount of data, since it
 may be invoked soon.
<P>
<DD><DL>

<DT><B>Throws:</B>
<DD><CODE><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/io/IOException.html" title="class or interface in java.io">IOException</A></CODE> - if an I/O operation was required but failed.</DL>
</DD>
</DL>
<HR>

<A NAME="getCoverage(org.geotools.image.io.IIOListeners)"><!-- --></A><H3>
getCoverage</H3>
<PRE>
public Coverage <B>getCoverage</B>(<A HREF="../../../org/geotools/image/io/IIOListeners.html" title="class in org.geotools.image.io">IIOListeners</A>&nbsp;listeners)
                                          throws <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/io/IOException.html" title="class or interface in java.io">IOException</A></PRE>
<DL>
<DD>Returns the coverage, loading the data if needed. Implementations should invokes the
 <A HREF="../../../org/geotools/image/io/IIOListeners.html#addListenersTo(javax.imageio.ImageReader)"><CODE>IIOListeners.addListenersTo(ImageReader)</CODE></A> method if they use an image reader
 for loading data. Caching (if desired) is implementor's responsability. The default
 <A HREF="../../../org/geotools/coverage/CoverageStack.html" title="class in org.geotools.coverage"><CODE>CoverageStack</CODE></A> implementation caches only the last coverage used.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>listeners</CODE> - Listeners to register to the <A HREF="http://java.sun.com/j2se/1.4/docs/api/javax/imageio/ImageReader.html" title="class or interface in javax.imageio">image I/O reader</A>,
         if such a reader is going to be used.
<DT><B>Throws:</B>
<DD><CODE><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/io/IOException.html" title="class or interface in java.io">IOException</A></CODE> - if a data loading was required but failed.</DL>
</DD>
</DL>
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