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 <h1 title="Package org.apache.sis.referencing.crs" class="title">Package org.apache.sis.referencing.crs</h1>
 </div>
 <hr>
 <div class="package-signature">package <span class="element-name">org.apache.sis.referencing.crs</span></div>
 <section class="package-description" id="package-description">
 <div class="block">Coordinate Reference System (CRS) definitions as coordinate systems related to the earth through datum.
  An explanation for this package is provided in the <a href="http://www.geoapi.org/3.0/javadoc/org.opengis.geoapi/org/opengis/referencing/crs/package-summary.html" class="external-link">OpenGIS® javadoc</a>.
  The remaining discussion on this page is specific to the SIS implementation.

  <p>The root class for this package is <a href="AbstractCRS.html" title="class in org.apache.sis.referencing.crs"><code>AbstractCRS</code></a>.
  Coordinate Reference System (CRS) can have various number of dimensions, but some restrictions
  apply depending on the CRS type:</p>

  <table class="sis">
    <caption>Common Coordinate Reference System types</caption>
    <tr><th>Dimension</th> <th>CRS type examples</th> <th>Remarks</th></tr>
    <tr>
      <td>3</td>
      <td><a href="DefaultGeographicCRS.html" title="class in org.apache.sis.referencing.crs">Geographic</a>,
          <a href="DefaultGeocentricCRS.html" title="class in org.apache.sis.referencing.crs">Geocentric</a></td>
      <td>ISO 19111 uses the same class, <code>GeodeticCRS</code>, for those two cases.</td>
    </tr><tr>
      <td>2</td>
      <td><a href="DefaultGeographicCRS.html" title="class in org.apache.sis.referencing.crs">Geographic</a>,
          <a href="DefaultProjectedCRS.html" title="class in org.apache.sis.referencing.crs">Projected</a></td>
      <td><code>GeographicCRS</code> can also be 3D.</td>
    </tr><tr>
      <td>1</td>
      <td><a href="DefaultVerticalCRS.html" title="class in org.apache.sis.referencing.crs">Vertical</a>,
          <a href="DefaultTemporalCRS.html" title="class in org.apache.sis.referencing.crs">Temporal</a>.</td>
      <td></td>
    </tr><tr>
      <td>Any</td>
      <td><a href="DefaultCompoundCRS.html" title="class in org.apache.sis.referencing.crs">Compound</a></td>
      <td>Often used for adding a time axis to the above CRS.</td>
    </tr>
  </table>

  <h2>Apache SIS extensions</h2>
  Some SIS implementations provide additional methods that are not part of OGC/ISO specifications:

  <ul>
    <li><code>AbstractCRS.forConvention(AxesConvention)</code></li>
    <li><a href="DefaultTemporalCRS.html#toDate(double)"><code>DefaultTemporalCRS.toDate(double)</code></a></li>
    <li><a href="DefaultTemporalCRS.html#toValue(java.time.Instant)"><code>DefaultTemporalCRS.toValue(Date)</code></a></li>
  </ul>

  In addition Apache SIS provides two distinct classes for geographic and geocentric CRS where OGC/ISO defines
  a single <code>GeodeticCRS</code> type. OGC/ISO distinguishes the geographic/geocentric cases according the type
  of the coordinate system associated to that CRS:

  <ul>
    <li>A geodetic CRS associated to an <a href="../cs/DefaultEllipsoidalCS.html" title="class in org.apache.sis.referencing.cs">ellipsoidal CS</a>
        is geographic.</li>
    <li>A geodetic CRS associated to a <a href="../cs/DefaultSphericalCS.html" title="class in org.apache.sis.referencing.cs">spherical</a> or
        <a href="../cs/DefaultCartesianCS.html" title="class in org.apache.sis.referencing.cs">Cartesian CS</a> is geocentric.</li>
  </ul>

  SIS keeps the geographic and geocentric CRS as distinct types since such distinction is in wide use.</div>
 <dl class="notes">
 <dt>Since:</dt>
 <dd>0.4</dd>

 <p><font size="-1">Defined in the <code>sis-referencing</code> module</font></p>
 </dl>
 </section>
 <section class="summary">
 <ul class="summary-list">
 <li>
 <div id="related-package-summary">
 <div class="caption"><span>Related Packages</span></div>
 <div class="summary-table two-column-summary">
 <div class="table-header col-first">Package</div>
 <div class="table-header col-last">Description</div>
 <div class="col-first even-row-color"><a href="../package-summary.html">org.apache.sis.referencing</a></div>
 <div class="col-last even-row-color">
 <div class="block">Base classes for reference systems used for general positioning.</div>
 </div>
 <div class="col-first odd-row-color"><a href="../cs/package-summary.html">org.apache.sis.referencing.cs</a></div>
 <div class="col-last odd-row-color">
 <div class="block">Coordinate System (CS) definitions as the set of coordinate system axes that spans the coordinate space.</div>
 </div>
 <div class="col-first even-row-color"><a href="../datum/package-summary.html">org.apache.sis.referencing.datum</a></div>
 <div class="col-last even-row-color">
 <div class="block">Relationship of a <code>CoordinateSystem</code> (an abstract mathematical entity) to the earth or other system.</div>
 </div>
 <div class="col-first odd-row-color"><a href="../factory/package-summary.html">org.apache.sis.referencing.factory</a></div>
 <div class="col-last odd-row-color">
 <div class="block">Creates Coordinate Reference System (CRS) objects from given properties or authority codes.</div>
 </div>
 <div class="col-first even-row-color"><a href="../gazetteer/package-summary.html">org.apache.sis.referencing.gazetteer</a></div>
 <div class="col-last even-row-color">
 <div class="block">Mapping between geographic identifiers (addresses, grid indexes…) and locations (descriptions, coordinates…).</div>
 </div>
 <div class="col-first odd-row-color"><a href="../operation/package-summary.html">org.apache.sis.referencing.operation</a></div>
 <div class="col-last odd-row-color">
 <div class="block">Relationship between any two <a href="AbstractCRS.html" title="class in org.apache.sis.referencing.crs">Coordinate Reference Systems</a> (CRS).</div>
 </div>
 </div>
 </div>
 </li>
 <li>
 <div id="class-summary">
 <div class="caption"><span>Classes</span></div>
 <div class="summary-table two-column-summary">
 <div class="table-header col-first">Class</div>
 <div class="table-header col-last">Description</div>
 <div class="col-first even-row-color class-summary class-summary-tab2"><a href="AbstractCRS.html" title="class in org.apache.sis.referencing.crs">AbstractCRS</a></div>
 <div class="col-last even-row-color class-summary class-summary-tab2">
 <div class="block">Coordinate reference system, defined by a <a href="../cs/AbstractCS.html" title="class in org.apache.sis.referencing.cs">coordinate system</a>
  and (usually) a <a href="../datum/AbstractDatum.html" title="class in org.apache.sis.referencing.datum">datum</a>.</div>
 </div>
 <div class="col-first odd-row-color class-summary class-summary-tab2"><a href="DefaultCompoundCRS.html" title="class in org.apache.sis.referencing.crs">DefaultCompoundCRS</a></div>
 <div class="col-last odd-row-color class-summary class-summary-tab2">
 <div class="block">A CRS describing the position of points through two or more independent coordinate reference systems.</div>
 </div>
 <div class="col-first even-row-color class-summary class-summary-tab2"><a href="DefaultDerivedCRS.html" title="class in org.apache.sis.referencing.crs">DefaultDerivedCRS</a></div>
 <div class="col-last even-row-color class-summary class-summary-tab2">
 <div class="block">A coordinate reference system that is defined by its coordinate <a href="../operation/DefaultConversion.html" title="class in org.apache.sis.referencing.operation">conversion</a>
  from another CRS (not by a <a href="../datum/AbstractDatum.html" title="class in org.apache.sis.referencing.datum">datum</a>).</div>
 </div>
 <div class="col-first odd-row-color class-summary class-summary-tab2"><a href="DefaultEngineeringCRS.html" title="class in org.apache.sis.referencing.crs">DefaultEngineeringCRS</a></div>
 <div class="col-last odd-row-color class-summary class-summary-tab2">
 <div class="block">A 1-, 2- or 3-dimensional contextually local coordinate reference system.</div>
 </div>
 <div class="col-first even-row-color class-summary class-summary-tab2"><a href="DefaultGeocentricCRS.html" title="class in org.apache.sis.referencing.crs">DefaultGeocentricCRS</a></div>
 <div class="col-last even-row-color class-summary class-summary-tab2">
 <div class="block">A 3-dimensional coordinate reference system with the origin at the approximate centre of mass of the earth.</div>
 </div>
 <div class="col-first odd-row-color class-summary class-summary-tab2"><a href="DefaultGeographicCRS.html" title="class in org.apache.sis.referencing.crs">DefaultGeographicCRS</a></div>
 <div class="col-last odd-row-color class-summary class-summary-tab2">
 <div class="block">A 2- or 3-dimensional coordinate reference system based on an ellipsoidal approximation of the geoid.</div>
 </div>
 <div class="col-first even-row-color class-summary class-summary-tab2"><a href="DefaultImageCRS.html" title="class in org.apache.sis.referencing.crs">DefaultImageCRS</a></div>
 <div class="col-last even-row-color class-summary class-summary-tab2">
 <div class="block">A 2-dimensional engineering coordinate reference system applied to locations in images.</div>
 </div>
 <div class="col-first odd-row-color class-summary class-summary-tab2"><a href="DefaultParametricCRS.html" title="class in org.apache.sis.referencing.crs">DefaultParametricCRS</a></div>
 <div class="col-last odd-row-color class-summary class-summary-tab2">
 <div class="block">A 1-dimensional coordinate reference system which uses parameter values or functions.</div>
 </div>
 <div class="col-first even-row-color class-summary class-summary-tab2"><a href="DefaultProjectedCRS.html" title="class in org.apache.sis.referencing.crs">DefaultProjectedCRS</a></div>
 <div class="col-last even-row-color class-summary class-summary-tab2">
 <div class="block">A 2-dimensional coordinate reference system used to approximate the shape of the earth on a planar surface.</div>
 </div>
 <div class="col-first odd-row-color class-summary class-summary-tab2"><a href="DefaultTemporalCRS.html" title="class in org.apache.sis.referencing.crs">DefaultTemporalCRS</a></div>
 <div class="col-last odd-row-color class-summary class-summary-tab2">
 <div class="block">A 1-dimensional coordinate reference system used for the recording of time.</div>
 </div>
 <div class="col-first even-row-color class-summary class-summary-tab2"><a href="DefaultVerticalCRS.html" title="class in org.apache.sis.referencing.crs">DefaultVerticalCRS</a></div>
 <div class="col-last even-row-color class-summary class-summary-tab2">
 <div class="block">A 1-dimensional coordinate reference system used for recording heights or depths.</div>
 </div>
 </div>
 </div>
 </li>
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	<h1 title="Package org.apache.sis.referencing.crs" class="title">Package org.apache.sis.referencing.crs</h1>
	</div>
	<hr>
	<div class="package-signature">package <span class="element-name">org.apache.sis.referencing.crs</span></div>
	<section class="package-description" id="package-description">
	<div class="block">Coordinate Reference System (CRS) definitions as coordinate systems related to the earth through datum.
	An explanation for this package is provided in the <a href="http://www.geoapi.org/3.0/javadoc/org.opengis.geoapi/org/opengis/referencing/crs/package-summary.html" class="external-link">OpenGIS® javadoc</a>.
	The remaining discussion on this page is specific to the SIS implementation.

	<p>The root class for this package is <a href="AbstractCRS.html" title="class in org.apache.sis.referencing.crs"><code>AbstractCRS</code></a>.
	Coordinate Reference System (CRS) can have various number of dimensions, but some restrictions
	apply depending on the CRS type:</p>

	<table class="sis">
	<caption>Common Coordinate Reference System types</caption>
	<tr><th>Dimension</th> <th>CRS type examples</th> <th>Remarks</th></tr>
	<tr>
	<td>3</td>
	<td><a href="DefaultGeographicCRS.html" title="class in org.apache.sis.referencing.crs">Geographic</a>,
	<a href="DefaultGeocentricCRS.html" title="class in org.apache.sis.referencing.crs">Geocentric</a></td>
	<td>ISO 19111 uses the same class, <code>GeodeticCRS</code>, for those two cases.</td>
	</tr><tr>
	<td>2</td>
	<td><a href="DefaultGeographicCRS.html" title="class in org.apache.sis.referencing.crs">Geographic</a>,
	<a href="DefaultProjectedCRS.html" title="class in org.apache.sis.referencing.crs">Projected</a></td>
	<td><code>GeographicCRS</code> can also be 3D.</td>
	</tr><tr>
	<td>1</td>
	<td><a href="DefaultVerticalCRS.html" title="class in org.apache.sis.referencing.crs">Vertical</a>,
	<a href="DefaultTemporalCRS.html" title="class in org.apache.sis.referencing.crs">Temporal</a>.</td>
	<td></td>
	</tr><tr>
	<td>Any</td>
	<td><a href="DefaultCompoundCRS.html" title="class in org.apache.sis.referencing.crs">Compound</a></td>
	<td>Often used for adding a time axis to the above CRS.</td>
	</tr>
	</table>

	<h2>Apache SIS extensions</h2>
	Some SIS implementations provide additional methods that are not part of OGC/ISO specifications:

	<ul>
	<li><code>AbstractCRS.forConvention(AxesConvention)</code></li>
	<li><a href="DefaultTemporalCRS.html#toDate(double)"><code>DefaultTemporalCRS.toDate(double)</code></a></li>
	<li><a href="DefaultTemporalCRS.html#toValue(java.time.Instant)"><code>DefaultTemporalCRS.toValue(Date)</code></a></li>
	</ul>

	In addition Apache SIS provides two distinct classes for geographic and geocentric CRS where OGC/ISO defines
	a single <code>GeodeticCRS</code> type. OGC/ISO distinguishes the geographic/geocentric cases according the type
	of the coordinate system associated to that CRS:

	<ul>
	<li>A geodetic CRS associated to an <a href="../cs/DefaultEllipsoidalCS.html" title="class in org.apache.sis.referencing.cs">ellipsoidal CS</a>
	is geographic.</li>
	<li>A geodetic CRS associated to a <a href="../cs/DefaultSphericalCS.html" title="class in org.apache.sis.referencing.cs">spherical</a> or
	<a href="../cs/DefaultCartesianCS.html" title="class in org.apache.sis.referencing.cs">Cartesian CS</a> is geocentric.</li>
	</ul>

	SIS keeps the geographic and geocentric CRS as distinct types since such distinction is in wide use.</div>
	<dl class="notes">
	<dt>Since:</dt>
	<dd>0.4</dd>

	<p><font size="-1">Defined in the <code>sis-referencing</code> module</font></p>
	</dl>
	</section>
	<section class="summary">
	<ul class="summary-list">
	<li>
	<div id="related-package-summary">
	<div class="caption"><span>Related Packages</span></div>
	<div class="summary-table two-column-summary">
	<div class="table-header col-first">Package</div>
	<div class="table-header col-last">Description</div>
	<div class="col-first even-row-color"><a href="../package-summary.html">org.apache.sis.referencing</a></div>
	<div class="col-last even-row-color">
	<div class="block">Base classes for reference systems used for general positioning.</div>
	</div>
	<div class="col-first odd-row-color"><a href="../cs/package-summary.html">org.apache.sis.referencing.cs</a></div>
	<div class="col-last odd-row-color">
	<div class="block">Coordinate System (CS) definitions as the set of coordinate system axes that spans the coordinate space.</div>
	</div>
	<div class="col-first even-row-color"><a href="../datum/package-summary.html">org.apache.sis.referencing.datum</a></div>
	<div class="col-last even-row-color">
	<div class="block">Relationship of a <code>CoordinateSystem</code> (an abstract mathematical entity) to the earth or other system.</div>
	</div>
	<div class="col-first odd-row-color"><a href="../factory/package-summary.html">org.apache.sis.referencing.factory</a></div>
	<div class="col-last odd-row-color">
	<div class="block">Creates Coordinate Reference System (CRS) objects from given properties or authority codes.</div>
	</div>
	<div class="col-first even-row-color"><a href="../gazetteer/package-summary.html">org.apache.sis.referencing.gazetteer</a></div>
	<div class="col-last even-row-color">
	<div class="block">Mapping between geographic identifiers (addresses, grid indexes…) and locations (descriptions, coordinates…).</div>
	</div>
	<div class="col-first odd-row-color"><a href="../operation/package-summary.html">org.apache.sis.referencing.operation</a></div>
	<div class="col-last odd-row-color">
	<div class="block">Relationship between any two <a href="AbstractCRS.html" title="class in org.apache.sis.referencing.crs">Coordinate Reference Systems</a> (CRS).</div>
	</div>
	</div>
	</div>
	</li>
	<li>
	<div id="class-summary">
	<div class="caption"><span>Classes</span></div>
	<div class="summary-table two-column-summary">
	<div class="table-header col-first">Class</div>
	<div class="table-header col-last">Description</div>
	<div class="col-first even-row-color class-summary class-summary-tab2"><a href="AbstractCRS.html" title="class in org.apache.sis.referencing.crs">AbstractCRS</a></div>
	<div class="col-last even-row-color class-summary class-summary-tab2">
	<div class="block">Coordinate reference system, defined by a <a href="../cs/AbstractCS.html" title="class in org.apache.sis.referencing.cs">coordinate system</a>
	and (usually) a <a href="../datum/AbstractDatum.html" title="class in org.apache.sis.referencing.datum">datum</a>.</div>
	</div>
	<div class="col-first odd-row-color class-summary class-summary-tab2"><a href="DefaultCompoundCRS.html" title="class in org.apache.sis.referencing.crs">DefaultCompoundCRS</a></div>
	<div class="col-last odd-row-color class-summary class-summary-tab2">
	<div class="block">A CRS describing the position of points through two or more independent coordinate reference systems.</div>
	</div>
	<div class="col-first even-row-color class-summary class-summary-tab2"><a href="DefaultDerivedCRS.html" title="class in org.apache.sis.referencing.crs">DefaultDerivedCRS</a></div>
	<div class="col-last even-row-color class-summary class-summary-tab2">
	<div class="block">A coordinate reference system that is defined by its coordinate <a href="../operation/DefaultConversion.html" title="class in org.apache.sis.referencing.operation">conversion</a>
	from another CRS (not by a <a href="../datum/AbstractDatum.html" title="class in org.apache.sis.referencing.datum">datum</a>).</div>
	</div>
	<div class="col-first odd-row-color class-summary class-summary-tab2"><a href="DefaultEngineeringCRS.html" title="class in org.apache.sis.referencing.crs">DefaultEngineeringCRS</a></div>
	<div class="col-last odd-row-color class-summary class-summary-tab2">
	<div class="block">A 1-, 2- or 3-dimensional contextually local coordinate reference system.</div>
	</div>
	<div class="col-first even-row-color class-summary class-summary-tab2"><a href="DefaultGeocentricCRS.html" title="class in org.apache.sis.referencing.crs">DefaultGeocentricCRS</a></div>
	<div class="col-last even-row-color class-summary class-summary-tab2">
	<div class="block">A 3-dimensional coordinate reference system with the origin at the approximate centre of mass of the earth.</div>
	</div>
	<div class="col-first odd-row-color class-summary class-summary-tab2"><a href="DefaultGeographicCRS.html" title="class in org.apache.sis.referencing.crs">DefaultGeographicCRS</a></div>
	<div class="col-last odd-row-color class-summary class-summary-tab2">
	<div class="block">A 2- or 3-dimensional coordinate reference system based on an ellipsoidal approximation of the geoid.</div>
	</div>
	<div class="col-first even-row-color class-summary class-summary-tab2"><a href="DefaultImageCRS.html" title="class in org.apache.sis.referencing.crs">DefaultImageCRS</a></div>
	<div class="col-last even-row-color class-summary class-summary-tab2">
	<div class="block">A 2-dimensional engineering coordinate reference system applied to locations in images.</div>
	</div>
	<div class="col-first odd-row-color class-summary class-summary-tab2"><a href="DefaultParametricCRS.html" title="class in org.apache.sis.referencing.crs">DefaultParametricCRS</a></div>
	<div class="col-last odd-row-color class-summary class-summary-tab2">
	<div class="block">A 1-dimensional coordinate reference system which uses parameter values or functions.</div>
	</div>
	<div class="col-first even-row-color class-summary class-summary-tab2"><a href="DefaultProjectedCRS.html" title="class in org.apache.sis.referencing.crs">DefaultProjectedCRS</a></div>
	<div class="col-last even-row-color class-summary class-summary-tab2">
	<div class="block">A 2-dimensional coordinate reference system used to approximate the shape of the earth on a planar surface.</div>
	</div>
	<div class="col-first odd-row-color class-summary class-summary-tab2"><a href="DefaultTemporalCRS.html" title="class in org.apache.sis.referencing.crs">DefaultTemporalCRS</a></div>
	<div class="col-last odd-row-color class-summary class-summary-tab2">
	<div class="block">A 1-dimensional coordinate reference system used for the recording of time.</div>
	</div>
	<div class="col-first even-row-color class-summary class-summary-tab2"><a href="DefaultVerticalCRS.html" title="class in org.apache.sis.referencing.crs">DefaultVerticalCRS</a></div>
	<div class="col-last even-row-color class-summary class-summary-tab2">
	<div class="block">A 1-dimensional coordinate reference system used for recording heights or depths.</div>
	</div>
	</div>
	</div>
	</li>
	</ul>
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