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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><!--NewPage--><HTML><HEAD><!-- Generated by javadoc (build 1.4.2_13) on Tue Jun 05 11:36:19 GMT-05:00 2007 --><META http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><TITLE>AbstractDatum (Geotools 2.3.x 2.3.2 API)</TITLE><META NAME="keywords" CONTENT="org.geotools.referencing.datum.AbstractDatum class"><META NAME="keywords" CONTENT="getAnchorPoint()"><META NAME="keywords" CONTENT="getRealizationEpoch()"><META NAME="keywords" CONTENT="getValidArea()"><META NAME="keywords" CONTENT="getScope()"><META NAME="keywords" CONTENT="equals()"><META NAME="keywords" CONTENT="formatWKT()"><LINK REL ="stylesheet" TYPE="text/css" HREF="../../../../stylesheet.css" TITLE="Style"><SCRIPT type="text/javascript">function windowTitle(){ parent.document.title="AbstractDatum (Geotools 2.3.x 2.3.2 API)";}</SCRIPT></HEAD><BODY BGCOLOR="white" onload="windowTitle();"><!-- ========= START OF TOP NAVBAR ======= --><A NAME="navbar_top"><!-- --></A><A HREF="#skip-navbar_top" title="Skip navigation links"></A><TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0" SUMMARY=""><TR><TD COLSPAN=3 BGCOLOR="#EEEEFF" CLASS="NavBarCell1"><A NAME="navbar_top_firstrow"><!-- --></A><TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3" SUMMARY=""> <TR ALIGN="center" VALIGN="top"> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../../overview-summary.html"><FONT CLASS="NavBarFont1"><B>Overview</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-summary.html"><FONT CLASS="NavBarFont1"><B>Package</B></FONT></A> </TD> <TD BGCOLOR="#FFFFFF" CLASS="NavBarCell1Rev"> <FONT CLASS="NavBarFont1Rev"><B>Class</B></FONT> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="class-use/AbstractDatum.html"><FONT CLASS="NavBarFont1"><B>Use</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-tree.html"><FONT CLASS="NavBarFont1"><B>Tree</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../../deprecated-list.html"><FONT CLASS="NavBarFont1"><B>Deprecated</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../../index-all.html"><FONT CLASS="NavBarFont1"><B>Index</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../../help-doc.html"><FONT CLASS="NavBarFont1"><B>Help</B></FONT></A> </TD> </TR></TABLE></TD><TD ALIGN="right" VALIGN="top" ROWSPAN=3><EM></EM></TD></TR><TR><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> PREV CLASS <A HREF="../../../../org/geotools/referencing/datum/BursaWolfParameters.html" title="class in org.geotools.referencing.datum"><B>NEXT CLASS</B></A></FONT></TD><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../../index.html" target="_top"><B>FRAMES</B></A> <A HREF="AbstractDatum.html" target="_top"><B>NO FRAMES</B></A> <SCRIPT type="text/javascript"> <!-- if(window==top) { document.writeln('<A HREF="../../../../allclasses-noframe.html"><B>All Classes</B></A>'); } //--></SCRIPT><NOSCRIPT> <A HREF="../../../../allclasses-noframe.html"><B>All Classes</B></A></NOSCRIPT></FONT></TD></TR><TR><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> SUMMARY: NESTED | <A HREF="#fields_inherited_from_class_AbstractIdentifiedObject">FIELD</A> | <A HREF="#constructor_summary">CONSTR</A> | <A HREF="#method_summary">METHOD</A></FONT></TD><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">DETAIL: FIELD | <A HREF="#constructor_detail">CONSTR</A> | <A HREF="#method_detail">METHOD</A></FONT></TD></TR></TABLE><A NAME="skip-navbar_top"></A><!-- ========= END OF TOP NAVBAR ========= --><HR><!-- ======== START OF CLASS DATA ======== --><H2><FONT SIZE="-1">org.geotools.referencing.datum</FONT><BR>Class AbstractDatum</H2><PRE><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A> <IMG SRC="../../../../resources/inherit.gif" ALT="extended by"><A HREF="../../../../org/geotools/referencing/wkt/Formattable.html" title="class in org.geotools.referencing.wkt">Formattable</A> <IMG SRC="../../../../resources/inherit.gif" ALT="extended by"><A HREF="../../../../org/geotools/referencing/AbstractIdentifiedObject.html" title="class in org.geotools.referencing">AbstractIdentifiedObject</A> <IMG SRC="../../../../resources/inherit.gif" ALT="extended by"><B>AbstractDatum</B></PRE><DL><DT><B>All Implemented Interfaces:</B> <DD>Datum, IdentifiedObject, <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/io/Serializable.html" title="class or interface in java.io">Serializable</A></DD></DL><DL><DT><B>Direct Known Subclasses:</B> <DD><A HREF="../../../../org/geotools/referencing/datum/DefaultEngineeringDatum.html" title="class in org.geotools.referencing.datum">DefaultEngineeringDatum</A>, <A HREF="../../../../org/geotools/referencing/datum/DefaultGeodeticDatum.html" title="class in org.geotools.referencing.datum">DefaultGeodeticDatum</A>, <A HREF="../../../../org/geotools/referencing/datum/DefaultImageDatum.html" title="class in org.geotools.referencing.datum">DefaultImageDatum</A>, <A HREF="../../../../org/geotools/referencing/datum/DefaultTemporalDatum.html" title="class in org.geotools.referencing.datum">DefaultTemporalDatum</A>, <A HREF="../../../../org/geotools/referencing/datum/DefaultVerticalDatum.html" title="class in org.geotools.referencing.datum">DefaultVerticalDatum</A></DD></DL><HR><DL><DT>public class <B>AbstractDatum</B><DT>extends <A HREF="../../../../org/geotools/referencing/AbstractIdentifiedObject.html" title="class in org.geotools.referencing">AbstractIdentifiedObject</A><DT>implements Datum</DL><P>Specifies the relationship of a coordinate system to the earth, thus creating a coordinate reference system. A datum uses a parameter or set of parameters that determine the location of the origin of the coordinate reference system. Each datum subtype can be associated with only specific types of coordinate systems. <p> A datum can be defined as a set of real points on the earth that have coordinates. The definition of the datum may also include the temporal behavior (such as the rate of change of the orientation of the coordinate axes). <p> This class is conceptually <cite>abstract</cite>, even if it is technically possible to instantiate it. Typical applications should create instances of the most specific subclass with prefix instead. An exception to this rule may occurs when it is not possible to identify the exact type.<P><P><DL><DT><B>Since:</B></DT> <DD>2.1</DD><DT><B>Author:</B></DT> <DD>Martin Desruisseaux</DD><DT><B>See Also:</B><DD><A HREF="../../../../org/geotools/referencing/cs/AbstractCS.html" title="class in org.geotools.referencing.cs"><CODE>AbstractCS</CODE></A>, <A HREF="../../../../org/geotools/referencing/crs/AbstractCRS.html" title="class in org.geotools.referencing.crs"><CODE>AbstractCRS</CODE></A>, <A HREF="../../../../serialized-form.html#org.geotools.referencing.datum.AbstractDatum">Serialized Form</A><DT><B>Module:</B></DT><DD><CODE><B>module/referencing</B></CODE> (<A HREF="http://maven.geotools.fr/repository/org/geotools/gt2-referencing/"><CODE>gt2-referencing.jar</CODE></A>) (<A HREF="http://maven.geotools.fr/reports/referencing/index.html">Maven report</A>) (<A HREF="http://svn.geotools.org/geotools/tags/2.3.2/module/referencing/src/org/geotools/referencing/datum/AbstractDatum.java">SVN head</A>)</DD></DL><HR><P><!-- ======== NESTED CLASS SUMMARY ======== --><!-- =========== FIELD SUMMARY =========== --><A NAME="field_summary"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Field Summary</B></FONT></TD></TR></TABLE> <A NAME="fields_inherited_from_class_AbstractIdentifiedObject"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"><TD><B>Fields inherited from class <A HREF="../../../../org/geotools/referencing/AbstractIdentifiedObject.html" title="class in org.geotools.referencing">AbstractIdentifiedObject</A></B></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><A HREF="../../../../org/geotools/referencing/AbstractIdentifiedObject.html#EMPTY_ALIAS_ARRAY">EMPTY_ALIAS_ARRAY</A>, <A HREF="../../../../org/geotools/referencing/AbstractIdentifiedObject.html#EMPTY_IDENTIFIER_ARRAY">EMPTY_IDENTIFIER_ARRAY</A>, <A HREF="../../../../org/geotools/referencing/AbstractIdentifiedObject.html#IDENTIFIER_COMPARATOR">IDENTIFIER_COMPARATOR</A>, <A HREF="../../../../org/geotools/referencing/AbstractIdentifiedObject.html#NAME_COMPARATOR">NAME_COMPARATOR</A>, <A HREF="../../../../org/geotools/referencing/AbstractIdentifiedObject.html#REMARKS_COMPARATOR">REMARKS_COMPARATOR</A></CODE></TD></TR></TABLE> <A NAME="fields_inherited_from_class_Datum"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"><TD><B>Fields inherited from interface Datum</B></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE>ANCHOR_POINT_KEY, REALIZATION_EPOCH_KEY, SCOPE_KEY, VALID_AREA_KEY</CODE></TD></TR></TABLE> <A NAME="fields_inherited_from_class_IdentifiedObject"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"><TD><B>Fields inherited from interface IdentifiedObject</B></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE>ALIAS_KEY, IDENTIFIERS_KEY, NAME_KEY, REMARKS_KEY</CODE></TD></TR></TABLE> <!-- ======== CONSTRUCTOR SUMMARY ======== --><A NAME="constructor_summary"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Constructor Summary</B></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><B><A HREF="../../../../org/geotools/referencing/datum/AbstractDatum.html#AbstractDatum(org.opengis.referencing.datum.Datum)">AbstractDatum</A></B>(Datum datum)</CODE><BR>⌨️ 快捷键说明
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