abstractcs.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

<DD>Returns the axis for this coordinate system at the specified dimension.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE>getAxis</CODE> in interface <CODE>CoordinateSystem</CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>dimension</CODE> - The zero based index of axis.
<DT><B>Returns:</B><DD>The axis at the specified dimension.
<DT><B>Throws:</B>
<DD><CODE><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/IndexOutOfBoundsException.html" title="class or interface in java.lang">IndexOutOfBoundsException</A></CODE> - if  is out of bounds.</DL>
</DD>
</DL>
<HR>

<A NAME="swapAndScaleAxis(org.opengis.referencing.cs.CoordinateSystem, org.opengis.referencing.cs.CoordinateSystem)"><!-- --></A><H3>
swapAndScaleAxis</H3>
<PRE>
public static Matrix <B>swapAndScaleAxis</B>(CoordinateSystem&nbsp;sourceCS,
                                      CoordinateSystem&nbsp;targetCS)
                                                                 throws <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/IllegalArgumentException.html" title="class or interface in java.lang">IllegalArgumentException</A>,
                                                                        <A HREF="http://jsr-108.sourceforge.net/javadoc/javax/units/ConversionException.html" title="class or interface in javax.units">ConversionException</A></PRE>
<DL>
<DD>Returns an affine transform between two coordinate systems. Only units and
 axis order (e.g. transforming from
 (NORTH,WEST) to
 (EAST,NORTH
 are taken in account.

 <P><STRONG>Example:</STRONG> If coordinates in  are
 (<var>x</var>,<var>y</var>) pairs in metres and coordinates in 
 are (-<var>y</var>,<var>x</var>) pairs in centimetres, then the transformation
 can be performed as below:</P>

 <pre><blockquote>
          [-y(cm)]   [ 0  -100    0 ] [x(m)]
          [ x(cm)] = [ 100   0    0 ] [y(m)]
          [ 1    ]   [ 0     0    1 ] [1   ]
 </blockquote></pre>
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>sourceCS</CODE> - The source coordinate system.<DD><CODE>targetCS</CODE> - The target coordinate system.
<DT><B>Returns:</B><DD>The conversion from  to  as
         an affine transform. Only axis direction and units are taken in account.
<DT><B>Throws:</B>
<DD><CODE><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/IllegalArgumentException.html" title="class or interface in java.lang">IllegalArgumentException</A></CODE> - if axis doesn't matches, or the CS doesn't have the
         same geometry.
<DD><CODE><A HREF="http://jsr-108.sourceforge.net/javadoc/javax/units/ConversionException.html" title="class or interface in javax.units">ConversionException</A></CODE> - if the unit conversion is non-linear.</DL>
</DD>
</DL>
<HR>

<A NAME="standard(org.opengis.referencing.cs.CoordinateSystem)"><!-- --></A><H3>
standard</H3>
<PRE>
public static CoordinateSystem <B>standard</B>(CoordinateSystem&nbsp;cs)
                                                            throws <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/IllegalArgumentException.html" title="class or interface in java.lang">IllegalArgumentException</A></PRE>
<DL>
<DD>Returns a coordinate system with "standard" axis order and units. This method returns one
 of the predefined constants with axis in (<var>longitude</var>,<var>latitude</var>) or
 (<var>X</var>,<var>Y</var>) order, and units in degree or metres. This method is typically
 used together with <A HREF="../../../../org/geotools/referencing/cs/AbstractCS.html#swapAndScaleAxis(org.opengis.referencing.cs.CoordinateSystem, org.opengis.referencing.cs.CoordinateSystem)"><CODE>swapAndScaleAxis</CODE></A> for the creation of a
 transformation step before some math transform. Example:

 <blockquote><pre>
 Matrix step1 = swapAndScaleAxis(sourceCS, standard(sourceCS));
 Matrix step2 = ... some transform operating on standard axis ...
 Matrix step3 = swapAndScaleAxis(standard(targetCS), targetCS);
 </pre></blockquote>
 <p>
 A rational for standard axis order and units is explained in the <cite>Axis units and
 direction</cite> section in the <A HREF="../../../../org/geotools/referencing/operation/projection/package-summary.html">description of map projection package</A>.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>cs</CODE> - The coordinate system.
<DT><B>Returns:</B><DD>A constant similar to the specified  with "standard" axis.
<DT><B>Throws:</B>
<DD><CODE><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/IllegalArgumentException.html" title="class or interface in java.lang">IllegalArgumentException</A></CODE> - if the specified coordinate system is unknow to this method.<DT><B>Since:</B></DT>
  <DD>2.2</DD>
</DL>
</DD>
</DL>
<HR>

<A NAME="distance(double[], double[])"><!-- --></A><H3>
distance</H3>
<PRE>
public <A HREF="../../../../org/geotools/measure/Measure.html" title="class in org.geotools.measure">Measure</A> <B>distance</B>(double[]&nbsp;coord1,
                        double[]&nbsp;coord2)
                 throws <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/UnsupportedOperationException.html" title="class or interface in java.lang">UnsupportedOperationException</A>,
                        MismatchedDimensionException</PRE>
<DL>
<DD>Computes the distance between two points. This method is not available for all coordinate
 systems. For example, <A HREF="../../../../org/geotools/referencing/cs/DefaultEllipsoidalCS.html" title="class in org.geotools.referencing.cs">ellipsoidal CS</A> doesn't have
 suffisient information.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>coord1</CODE> - Coordinates of the first point.<DD><CODE>coord2</CODE> - Coordinates of the second point.
<DT><B>Returns:</B><DD>The distance between  and .
<DT><B>Throws:</B>
<DD><CODE><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/UnsupportedOperationException.html" title="class or interface in java.lang">UnsupportedOperationException</A></CODE> - if this coordinate system can't compute distances.
<DD><CODE>MismatchedDimensionException</CODE> - if a coordinate doesn't have the expected dimension.</DL>
</DD>
</DL>
<HR>

<A NAME="equals(org.geotools.referencing.AbstractIdentifiedObject, boolean)"><!-- --></A><H3>
equals</H3>
<PRE>
public boolean <B>equals</B>(<A HREF="../../../../org/geotools/referencing/AbstractIdentifiedObject.html" title="class in org.geotools.referencing">AbstractIdentifiedObject</A>&nbsp;object,
                      boolean&nbsp;compareMetadata)</PRE>
<DL>
<DD>Compares the specified object with this coordinate system for equality.
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../org/geotools/referencing/AbstractIdentifiedObject.html#equals(org.geotools.referencing.AbstractIdentifiedObject, boolean)">equals</A></CODE> in class <CODE><A HREF="../../../../org/geotools/referencing/AbstractIdentifiedObject.html" title="class in org.geotools.referencing">AbstractIdentifiedObject</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>object</CODE> - The object to compare to .<DD><CODE>compareMetadata</CODE> -  for performing a strict comparaison, or
          for comparing only properties relevant to transformations.
<DT><B>Returns:</B><DD> if both objects are equal.</DL>
</DD>
</DL>
<HR>

<A NAME="hashCode()"><!-- --></A><H3>
hashCode</H3>
<PRE>
public int <B>hashCode</B>()</PRE>
<DL>
<DD>Returns a hash value for this coordinate system.
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../org/geotools/referencing/AbstractIdentifiedObject.html#hashCode()">hashCode</A></CODE> in class <CODE><A HREF="../../../../org/geotools/referencing/AbstractIdentifiedObject.html" title="class in org.geotools.referencing">AbstractIdentifiedObject</A></CODE></DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>The hash code value. This value doesn't need to be the same
         in past or future versions of this class.</DL>
</DD>
</DL>
<HR>

<A NAME="formatWKT(org.geotools.referencing.wkt.Formatter)"><!-- --></A><H3>
formatWKT</H3>
<PRE>
protected <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>formatWKT</B>(<A HREF="../../../../org/geotools/referencing/wkt/Formatter.html" title="class in org.geotools.referencing.wkt">Formatter</A>&nbsp;formatter)</PRE>
<DL>
<DD>Format the inner part of a
 <A HREF="http://geoapi.sourceforge.net/snapshot/javadoc/org/opengis/referencing/doc-files/WKT.html"><cite>Well
 Known Text</cite> (WKT)</A> element. Note that WKT is not yet defined for coordinate system.
 Current implementation list the axis contained in this CS.
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../org/geotools/referencing/wkt/Formattable.html#formatWKT(org.geotools.referencing.wkt.Formatter)">formatWKT</A></CODE> in class <CODE><A HREF="../../../../org/geotools/referencing/wkt/Formattable.html" title="class in org.geotools.referencing.wkt">Formattable</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>formatter</CODE> - The formatter to use.
<DT><B>Returns:</B><DD>The WKT element name. Current implementation default to the class name.<DT><B>See Also:</B><DD><A HREF="../../../../org/geotools/referencing/wkt/Formattable.html#toWKT()"><CODE>Formattable.toWKT()</CODE></A>, 
<A HREF="../../../../org/geotools/referencing/wkt/Formattable.html#toString()"><CODE>Formattable.toString()</CODE></A></DL>
</DD>
</DL>
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