abstractdatum.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

getAnchorPoint</H3>
<PRE>
public InternationalString <B>getAnchorPoint</B>()</PRE>
<DL>
<DD>Description, possibly including coordinates, of the point or points used to anchor the datum
 to the Earth. Also known as the "origin", especially for Engineering and Image Datums.

 <ul>
   <li>For a geodetic datum, this point is also known as the fundamental point, which is
       traditionally the point where the relationship between geoid and ellipsoid is defined.
       In some cases, the "fundamental point" may consist of a number of points. In those
       cases, the parameters defining the geoid/ellipsoid relationship have then been averaged
       for these points, and the averages adopted as the datum definition.</li>

   <li>For an engineering datum, the anchor point may be a physical point, or it may be a
       point with defined coordinates in another CRS.</li>

   <li>For an image datum, the anchor point is usually either the centre of the image or the
       corner of the image.</li>

   <li>For a temporal datum, this attribute is not defined. Instead of the anchor point,
       a temporal datum carries a separate time origin of type <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/util/Date.html" title="class or interface in java.util"><CODE>Date</CODE></A>.</li>
 </ul>
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE>getAnchorPoint</CODE> in interface <CODE>Datum</CODE></DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="getRealizationEpoch()"><!-- --></A><H3>
getRealizationEpoch</H3>
<PRE>
public <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/util/Date.html" title="class or interface in java.util">Date</A> <B>getRealizationEpoch</B>()</PRE>
<DL>
<DD>The time after which this datum definition is valid. This time may be precise (e.g. 1997
 for IRTF97) or merely a year (e.g. 1983 for NAD83). In the latter case, the epoch usually
 refers to the year in which a major recalculation of the geodetic control network, underlying
 the datum, was executed or initiated. An old datum can remain valid after a new datum is
 defined. Alternatively, a datum may be superseded by a later datum, in which case the
 realization epoch for the new datum defines the upper limit for the validity of the
 superseded datum.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE>getRealizationEpoch</CODE> in interface <CODE>Datum</CODE></DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="getValidArea()"><!-- --></A><H3>
getValidArea</H3>
<PRE>
public Extent <B>getValidArea</B>()</PRE>
<DL>
<DD>Area or region in which this datum object is valid.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE>getValidArea</CODE> in interface <CODE>Datum</CODE></DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="getScope()"><!-- --></A><H3>
getScope</H3>
<PRE>
public InternationalString <B>getScope</B>()</PRE>
<DL>
<DD>Description of domain of usage, or limitations of usage, for which this
 datum object is valid.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE>getScope</CODE> in interface <CODE>Datum</CODE></DL>
</DD>
<DD><DL>
</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 datum 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="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: All subclasses will override this method, but only <A HREF="../../../../org/geotools/referencing/datum/DefaultGeodeticDatum.html" title="class in org.geotools.referencing.datum"><CODE>DefaultGeodeticDatum</CODE></A> will
       <strong>not</strong> invokes this parent method, because horizontal datum do not write
       the datum type.
<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.<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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