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| <h1 title="Package org.apache.sis.referencing.datum" class="title">Package org.apache.sis.referencing.datum</h1> |
| </div> |
| <hr> |
| <div class="package-signature">package <span class="element-name">org.apache.sis.referencing.datum</span></div> |
| <section class="package-description" id="package-description"> |
| <div class="block">Relationship of a <code>CoordinateSystem</code> (an abstract mathematical entity) to the earth or other system. |
| An explanation for this package is provided in the <a href="http://www.geoapi.org/3.0/javadoc/org.opengis.geoapi/org/opengis/referencing/datum/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 in this package is <a href="AbstractDatum.html" title="class in org.apache.sis.referencing.datum"><code>AbstractDatum</code></a>. |
| Various subclasses are defined for various kinds of relationship to the Earth or time |
| (<a href="DefaultGeodeticDatum.html" title="class in org.apache.sis.referencing.datum">geodetic</a>, |
| <a href="DefaultVerticalDatum.html" title="class in org.apache.sis.referencing.datum">vertical</a>, |
| <a href="DefaultTemporalDatum.html" title="class in org.apache.sis.referencing.datum">temporal</a>), |
| or to platforms (mobile or not) |
| (<a href="DefaultEngineeringDatum.html" title="class in org.apache.sis.referencing.datum">engineering</a>, |
| <a href="DefaultImageDatum.html" title="class in org.apache.sis.referencing.datum">image</a>). |
| Some of those SIS subclasses provide additional methods that are not part of OGC/ISO specifications:</p> |
| <ul> |
| <li><a href="DefaultEllipsoid.html#getAuthalicRadius()"><code>DefaultEllipsoid.getAuthalicRadius()</code></a></li> |
| <li><a href="DefaultEllipsoid.html#getEccentricity()"><code>DefaultEllipsoid.getEccentricity()</code></a></li> |
| <li><a href="DefaultPrimeMeridian.html#getGreenwichLongitude(javax.measure.Unit)"><code>DefaultPrimeMeridian.getGreenwichLongitude(Unit)</code></a></li> |
| <li><a href="DefaultGeodeticDatum.html#getBursaWolfParameters()"><code>DefaultGeodeticDatum.getBursaWolfParameters()</code></a></li> |
| <li><a href="DefaultGeodeticDatum.html#getPositionVectorTransformation(org.opengis.referencing.datum.GeodeticDatum,org.opengis.metadata.extent.Extent)"><code>DefaultGeodeticDatum.getPositionVectorTransformation(GeodeticDatum, Extent)</code></a></li> |
| </ul> |
| |
| <h2>Datum shifts</h2> |
| Three classes are provided in support of coordinate transformations between different datums: |
| <ul> |
| <li><a href="BursaWolfParameters.html" title="class in org.apache.sis.referencing.datum"><code>BursaWolfParameters</code></a> performs an approximation |
| based on a translation, rotation and scale of geocentric coordinates.</li> |
| <li><a href="TimeDependentBWP.html" title="class in org.apache.sis.referencing.datum"><code>TimeDependentBWP</code></a> is like <code>BursaWolfParameters</code>, |
| but varies with time for taking in account the motion of plate tectonic.</li> |
| <li><a href="DatumShiftGrid.html" title="class in org.apache.sis.referencing.datum"><code>DatumShiftGrid</code></a> is used for more accurate transformations |
| than what <code>BursaWolfParameters</code> allows, by interpolating the geographic or geocentric translations |
| in a grid (e.g. NADCON or NTv2) instead of apply the same transformation for every points.</li> |
| </ul></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="../crs/package-summary.html">org.apache.sis.referencing.crs</a></div> |
| <div class="col-last odd-row-color"> |
| <div class="block">Coordinate Reference System (CRS) definitions as coordinate systems related to the earth through datum.</div> |
| </div> |
| <div class="col-first even-row-color"><a href="../cs/package-summary.html">org.apache.sis.referencing.cs</a></div> |
| <div class="col-last even-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 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="../crs/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="AbstractDatum.html" title="class in org.apache.sis.referencing.datum">AbstractDatum</a></div> |
| <div class="col-last even-row-color class-summary class-summary-tab2"> |
| <div class="block">Specifies the relationship of a <a href="../cs/AbstractCS.html" title="class in org.apache.sis.referencing.cs">Coordinate System</a> to the earth.</div> |
| </div> |
| <div class="col-first odd-row-color class-summary class-summary-tab2"><a href="BursaWolfParameters.html" title="class in org.apache.sis.referencing.datum">BursaWolfParameters</a></div> |
| <div class="col-last odd-row-color class-summary class-summary-tab2"> |
| <div class="block">Parameters for a geographic transformation between two datum having the same prime meridian.</div> |
| </div> |
| <div class="col-first even-row-color class-summary class-summary-tab2"><a href="DatumShiftGrid.html" title="class in org.apache.sis.referencing.datum">DatumShiftGrid</a><C extends <a href="http://unitsofmeasurement.github.io/unit-api/site/apidocs/javax/measure/Quantity.html" title="class or interface in javax.measure" class="external-link">Quantity</a><C>,<wbr>T extends <a href="http://unitsofmeasurement.github.io/unit-api/site/apidocs/javax/measure/Quantity.html" title="class or interface in javax.measure" class="external-link">Quantity</a><T>></div> |
| <div class="col-last even-row-color class-summary class-summary-tab2"> |
| <div class="block">Small but non-constant translations to apply on coordinates for datum shifts or other transformation process.</div> |
| </div> |
| <div class="col-first odd-row-color class-summary class-summary-tab2"><a href="DefaultEllipsoid.html" title="class in org.apache.sis.referencing.datum">DefaultEllipsoid</a></div> |
| <div class="col-last odd-row-color class-summary class-summary-tab2"> |
| <div class="block">Geometric figure that can be used to describe the approximate shape of the earth.</div> |
| </div> |
| <div class="col-first even-row-color class-summary class-summary-tab2"><a href="DefaultEngineeringDatum.html" title="class in org.apache.sis.referencing.datum">DefaultEngineeringDatum</a></div> |
| <div class="col-last even-row-color class-summary class-summary-tab2"> |
| <div class="block">Defines the origin of an engineering coordinate reference system.</div> |
| </div> |
| <div class="col-first odd-row-color class-summary class-summary-tab2"><a href="DefaultGeodeticDatum.html" title="class in org.apache.sis.referencing.datum">DefaultGeodeticDatum</a></div> |
| <div class="col-last odd-row-color class-summary class-summary-tab2"> |
| <div class="block">Defines the location and orientation of an ellipsoid that approximates the shape of the earth.</div> |
| </div> |
| <div class="col-first even-row-color class-summary class-summary-tab2"><a href="DefaultImageDatum.html" title="class in org.apache.sis.referencing.datum">DefaultImageDatum</a></div> |
| <div class="col-last even-row-color class-summary class-summary-tab2"> |
| <div class="block">Defines the origin of an image coordinate reference system.</div> |
| </div> |
| <div class="col-first odd-row-color class-summary class-summary-tab2"><a href="DefaultParametricDatum.html" title="class in org.apache.sis.referencing.datum">DefaultParametricDatum</a></div> |
| <div class="col-last odd-row-color class-summary class-summary-tab2"> |
| <div class="block">Defines the origin of a parametric coordinate reference system.</div> |
| </div> |
| <div class="col-first even-row-color class-summary class-summary-tab2"><a href="DefaultPrimeMeridian.html" title="class in org.apache.sis.referencing.datum">DefaultPrimeMeridian</a></div> |
| <div class="col-last even-row-color class-summary class-summary-tab2"> |
| <div class="block">Defines the origin from which longitude values are determined.</div> |
| </div> |
| <div class="col-first odd-row-color class-summary class-summary-tab2"><a href="DefaultTemporalDatum.html" title="class in org.apache.sis.referencing.datum">DefaultTemporalDatum</a></div> |
| <div class="col-last odd-row-color class-summary class-summary-tab2"> |
| <div class="block">Defines the origin of a temporal coordinate reference system.</div> |
| </div> |
| <div class="col-first even-row-color class-summary class-summary-tab2"><a href="DefaultVerticalDatum.html" title="class in org.apache.sis.referencing.datum">DefaultVerticalDatum</a></div> |
| <div class="col-last even-row-color class-summary class-summary-tab2"> |
| <div class="block">Identifies a particular reference level surface used as a zero-height surface.</div> |
| </div> |
| <div class="col-first odd-row-color class-summary class-summary-tab2"><a href="TimeDependentBWP.html" title="class in org.apache.sis.referencing.datum">TimeDependentBWP</a></div> |
| <div class="col-last odd-row-color class-summary class-summary-tab2"> |
| <div class="block">Parameters for a time-dependent geographic transformation between two datum.</div> |
| </div> |
| </div> |
| </div> |
| </li> |
| </ul> |
| </section> |
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