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| <h1 title="Package org.apache.sis.referencing.operation" class="title">Package org.apache.sis.referencing.operation</h1> |
| </div> |
| <hr> |
| <div class="package-signature">package <span class="element-name">org.apache.sis.referencing.operation</span></div> |
| <section class="package-description" id="package-description"> |
| <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). |
| An explanation for this package is provided in the <a href="http://www.geoapi.org/3.0/javadoc/org.opengis.geoapi/org/opengis/referencing/operation/package-summary.html" class="external-link">OpenGIS® javadoc</a>. |
| The remaining discussion on this page is specific to the Apache SIS implementation. |
| |
| <p>This package provides an ISO 19111 <a href="AbstractCoordinateOperation.html" title="class in org.apache.sis.referencing.operation">Coordinate Operation implementation</a> and support classes. The actual transform work is performed by the following |
| sub-packages, but most users will not need to deal with them directly:</p> |
| |
| <ul> |
| <li><a href="projection/package-summary.html"><code>org.apache.sis.referencing.operation.projection</code></a> — map projections,</li> |
| <li><a href="transform/package-summary.html"><code>org.apache.sis.referencing.operation.transform</code></a> — any transform other than map projections.</li> |
| </ul> |
| |
| <h2>Apache SIS extensions</h2> |
| Some SIS implementations provide additional methods that are not part of OGC/ISO specifications: |
| |
| <ul> |
| <li><a href="AbstractCoordinateOperation.html#getLinearAccuracy()"><code>AbstractCoordinateOperation.getLinearAccuracy()</code></a> |
| — tries to convert the accuracy to metres,</li> |
| <li><a href="DefaultConversion.html#specialize(java.lang.Class,org.opengis.referencing.crs.CoordinateReferenceSystem,org.opengis.referencing.crs.CoordinateReferenceSystem,org.opengis.referencing.operation.MathTransformFactory)"><code>DefaultConversion.specialize(…)</code></a> |
| — changes a <cite>defining conversion</cite> into a complete conversion.</li> |
| </ul> |
| |
| <h2>Apache SIS specific behavior</h2> |
| The following operations have a behavior in Apache SIS which may be different |
| than the behavior found in other software products. Those particularities apply only when the math transform is |
| <a href="transform/DefaultMathTransformFactory.html#createParameterizedTransform(org.opengis.parameter.ParameterValueGroup)">created directly</a>. Users do not need to care about them when the coordinate operation is |
| <a href="DefaultCoordinateOperationFactory.html#createOperation(org.opengis.referencing.crs.CoordinateReferenceSystem,org.opengis.referencing.crs.CoordinateReferenceSystem)">inferred by Apache SIS for a given pair of CRS</a>. |
| |
| <ul> |
| <li><b>Longitude rotation</b> (EPSG:9601) — the longitude offset may be specified in any units, |
| but SIS unconditionally converts the value to degrees. Consequently, the user is responsible |
| for converting the longitude axis of source and target CRS to degrees before this operation is applied.</li> |
| </ul> |
| |
| <h2><cite>Early binding</cite> versus <cite>late binding</cite> implementations</h2> |
| There is sometimes multiple ways of transforming coordinates for a given pair of source and target CRS. |
| For example, the <a href="../datum/BursaWolfParameters.html" title="class in org.apache.sis.referencing.datum">Bursa-Wolf parameters</a> |
| may vary depending on the area of interest, like in the transformations from NAD27 to WGS84. |
| Even for a fixed set of Bursa-Wolf parameter, there is various ways to use them (<cite>Molodensky</cite>, |
| <cite>Abridged Molodensky</cite>, <cite>Geocentric translation</cite>, <cite>etc.</cite>). |
| |
| <p>EPSG identifies two approaches for addressing this multiplicity problem. |
| Quoting the GIGS guideline:</p> |
| |
| <blockquote> |
| <ul class="verbose"> |
| <li><b>Early binding:</b> |
| A priori association of a coordinate transformation with a geodetic CRS. |
| The association is usually made at start-up of the session or project, as that is defined in the software, |
| but always before any data is associated with the ‘CRS’. In general the ‘coordinate transformation’ specified |
| uses the ‘CRS’ of the data as the source ‘CRS’ and WGS 84 as the target ‘CRS’.</li> |
| |
| <li><b>Late binding:</b> |
| Association at run time of a coordinate transformation with a CRS. |
| Late binding allows the user to select the appropriate transformation upon import of ‘geospatial data’ |
| or merge of two geospatial datasets. This means that, in cases where there are multiple existing transformations, |
| the user can choose the appropriate one, possibly aided by additional information.</li> |
| </ul> |
| <p style="text-align:right; font-size:small"><b>Source:</b> |
| <u>Geospatial Integrity of Geoscience Software Part 1 – GIGS guidelines.</u> |
| <i>OGP publication, Report No. 430-1, September 2011</i></p> |
| </blockquote> |
| |
| Apache SIS is a <cite>late binding</cite> implementation, while a little trace for <cite>early binding</cite> |
| exists in the form of the <a href="../datum/DefaultGeodeticDatum.html#getBursaWolfParameters()"><code>DefaultGeodeticDatum.getBursaWolfParameters()</code></a> |
| method for those who really need it. This means that when searching for a coordinate operation between a given |
| pair of CRS, Apache SIS will query <a href="../factory/sql/EPSGFactory.html" title="class in org.apache.sis.referencing.factory.sql"><code>EPSGFactory</code></a> before to try to |
| <a href="CoordinateOperationFinder.html" title="class in org.apache.sis.referencing.operation">infer the operation path by itelf</a>. |
| The <a href="CoordinateOperationContext.html" title="class in org.apache.sis.referencing.operation"><code>CoordinateOperationContext</code></a> can be used for further refinements, |
| for example by specifying the area of interest.</div> |
| <dl class="notes"> |
| <dt>Since:</dt> |
| <dd>0.6</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="builder/package-summary.html">org.apache.sis.referencing.operation.builder</a></div> |
| <div class="col-last odd-row-color"> |
| <div class="block">Helper classes for creating <a href="transform/AbstractMathTransform.html" title="class in org.apache.sis.referencing.operation.transform">Math Transforms</a> from a set of points.</div> |
| </div> |
| <div class="col-first even-row-color"><a href="matrix/package-summary.html">org.apache.sis.referencing.operation.matrix</a></div> |
| <div class="col-last even-row-color"> |
| <div class="block">Matrix implementations for spatiotemporal referencing.</div> |
| </div> |
| <div class="col-first odd-row-color"><a href="projection/package-summary.html">org.apache.sis.referencing.operation.projection</a></div> |
| <div class="col-last odd-row-color"> |
| <div class="block">Map projection implementations.</div> |
| </div> |
| <div class="col-first even-row-color"><a href="transform/package-summary.html">org.apache.sis.referencing.operation.transform</a></div> |
| <div class="col-last even-row-color"> |
| <div class="block">Conversions or transformations of multi-dimensional coordinate tuples.</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="../datum/package-summary.html">org.apache.sis.referencing.datum</a></div> |
| <div class="col-last odd-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 even-row-color"><a href="../factory/package-summary.html">org.apache.sis.referencing.factory</a></div> |
| <div class="col-last even-row-color"> |
| <div class="block">Creates Coordinate Reference System (CRS) objects from given properties or authority codes.</div> |
| </div> |
| <div class="col-first odd-row-color"><a href="../gazetteer/package-summary.html">org.apache.sis.referencing.gazetteer</a></div> |
| <div class="col-last odd-row-color"> |
| <div class="block">Mapping between geographic identifiers (addresses, grid indexes…) and locations (descriptions, coordinates…).</div> |
| </div> |
| </div> |
| </div> |
| </li> |
| <li> |
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| <div id="class-summary.tabpanel" role="tabpanel"> |
| <div class="summary-table two-column-summary" aria-labelledby="class-summary-tab0"> |
| <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="AbstractCoordinateOperation.html" title="class in org.apache.sis.referencing.operation">AbstractCoordinateOperation</a></div> |
| <div class="col-last even-row-color class-summary class-summary-tab2"> |
| <div class="block">Describes the operation for transforming coordinates in the source CRS to coordinates in the target CRS.</div> |
| </div> |
| <div class="col-first odd-row-color class-summary class-summary-tab2"><a href="CoordinateOperationContext.html" title="class in org.apache.sis.referencing.operation">CoordinateOperationContext</a></div> |
| <div class="col-last odd-row-color class-summary class-summary-tab2"> |
| <div class="block">Optional information about the context in which a requested coordinate operation will be used.</div> |
| </div> |
| <div class="col-first even-row-color class-summary class-summary-tab2"><a href="CoordinateOperationFinder.html" title="class in org.apache.sis.referencing.operation">CoordinateOperationFinder</a></div> |
| <div class="col-last even-row-color class-summary class-summary-tab2"> |
| <div class="block">Finds a conversion or transformation path from a source CRS to a target CRS.</div> |
| </div> |
| <div class="col-first odd-row-color class-summary class-summary-tab2"><a href="DefaultConversion.html" title="class in org.apache.sis.referencing.operation">DefaultConversion</a></div> |
| <div class="col-last odd-row-color class-summary class-summary-tab2"> |
| <div class="block">A parameterized mathematical operation that converts coordinates to another CRS without any change of |
| <a href="../datum/AbstractDatum.html" title="class in org.apache.sis.referencing.datum">datum</a>.</div> |
| </div> |
| <div class="col-first even-row-color class-summary class-summary-tab2"><a href="DefaultCoordinateOperationFactory.html" title="class in org.apache.sis.referencing.operation">DefaultCoordinateOperationFactory</a></div> |
| <div class="col-last even-row-color class-summary class-summary-tab2"> |
| <div class="block">Creates <a href="AbstractCoordinateOperation.html" title="class in org.apache.sis.referencing.operation">operations</a> capable to transform coordinates |
| from a given source CRS to a given target CRS.</div> |
| </div> |
| <div class="col-first odd-row-color class-summary class-summary-tab2"><a href="DefaultFormula.html" title="class in org.apache.sis.referencing.operation">DefaultFormula</a></div> |
| <div class="col-last odd-row-color class-summary class-summary-tab2"> |
| <div class="block">Specification of the coordinate operation method formula.</div> |
| </div> |
| <div class="col-first even-row-color class-summary class-summary-tab2"><a href="DefaultOperationMethod.html" title="class in org.apache.sis.referencing.operation">DefaultOperationMethod</a></div> |
| <div class="col-last even-row-color class-summary class-summary-tab2"> |
| <div class="block">Describes the algorithm and parameters used to perform a coordinate operation.</div> |
| </div> |
| <div class="col-first odd-row-color class-summary class-summary-tab2"><a href="DefaultPassThroughOperation.html" title="class in org.apache.sis.referencing.operation">DefaultPassThroughOperation</a></div> |
| <div class="col-last odd-row-color class-summary class-summary-tab2"> |
| <div class="block">Specifies that a subset of a coordinate tuple is subject to a specific coordinate operation.</div> |
| </div> |
| <div class="col-first even-row-color class-summary class-summary-tab2"><a href="DefaultTransformation.html" title="class in org.apache.sis.referencing.operation">DefaultTransformation</a></div> |
| <div class="col-last even-row-color class-summary class-summary-tab2"> |
| <div class="block">A parameterized mathematical operation that transforms coordinates to another CRS with a change of |
| <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-tab5"><a href="MismatchedDatumException.html" title="class in org.apache.sis.referencing.operation">MismatchedDatumException</a></div> |
| <div class="col-last odd-row-color class-summary class-summary-tab5"> |
| <div class="block">Thrown when the source and target CRS of a <a href="DefaultConversion.html" title="class in org.apache.sis.referencing.operation">conversion</a> use different datum.</div> |
| </div> |
| </div> |
| </div> |
| </div> |
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