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| <h1 title="Package org.apache.sis.storage.tiling" class="title">Package org.apache.sis.storage.tiling</h1> |
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| <hr> |
| <div class="package-signature">package <span class="element-name">org.apache.sis.storage.tiling</span></div> |
| <section class="package-description" id="package-description"> |
| <div class="block">Base types for retrieving and saving tiles in resources. |
| A <a href="TiledResource.html" title="interface in org.apache.sis.storage.tiling"><code>TiledResource</code></a> if a resource capable to describe its tiling schemes as <a href="TileMatrixSet.html" title="interface in org.apache.sis.storage.tiling"><code>TileMatrixSet</code></a> instances. |
| A <a href="TileMatrixSet.html" title="interface in org.apache.sis.storage.tiling"><code>TileMatrixSet</code></a> is a collection of <a href="TileMatrix.html" title="interface in org.apache.sis.storage.tiling"><code>TileMatrix</code></a> instances in the same CRS but at different scale levels. |
| A <a href="TileMatrix.html" title="interface in org.apache.sis.storage.tiling"><code>TileMatrix</code></a> is a collection of <a href="Tile.html" title="interface in org.apache.sis.storage.tiling"><code>Tile</code></a> instances with the same size and properties placed on a regular grid with no overlapping. |
| The "tile" word is used because of its wide usage with two-dimensional data, but actually this package has no restriction |
| on the number of dimensions and can work with multi-dimensional "tiles" as well. |
| |
| <h2>References</h2> |
| <ul> |
| <li><a href="https://www.ogc.org/standards/tms">OGC Two Dimensional Tile Matrix Set</a> — the core standard used in this package.</li> |
| <li><a href="https://www.ogc.org/standards/wmts">OGC Web Map Tile Service (WMTS)</a> — a common use of above standard.</li> |
| <li><a href="https://docs.opengeospatial.org/is/17-066r1/17-066r1.html">OGC Geopackage: Extension for Tiled Gridded Coverage Data</a> — another common use.</li> |
| <li><a href="https://docs.ogc.org/per/18-074.html">OGC Geopackage: Extension for vector tiles</a> — experimental work for tiled geometries.</li> |
| </ul> |
| |
| The concepts developed in above references are also used, often with different names, by other projects such as |
| <a href="https://wiki.osgeo.org/wiki/Tile_Map_Service_Specification">OSGeo Tile Map Service Specification</a>, |
| <a href="https://github.com/CesiumGS/quantized-mesh">Cesium QuantizedMesh</a>, |
| <a href="https://wiki.openstreetmap.org/wiki/Slippy_map_tilenames">Open Street Map: Slippy Map</a>, |
| <a href="https://developers.google.com/maps/documentation/javascript/coordinates">Google Map</a> and |
| <a href="https://docs.mapbox.com/mapbox-tiling-service/guides/">MapBox Tiling service</a>. |
| |
| |
| <h2>Relationship with OGC specifications</h2> |
| The <code>TileMatrix</code> and <code>TileMatrixSet</code> class names are reused as defined by OGC. |
| The "2D" suffix in class names is omitted because this package is fully multi-dimensional. |
| The concept of "tiling scheme" is encapsulated in a <a href="../../coverage/grid/GridGeometry.html" title="class in org.apache.sis.coverage.grid"><code>GridGeometry</code></a>. |
| |
| <h3>Departures with OGC specifications</h3> |
| The OGC <code>TileMatrixLimits</code> class is replaced by <a href="../../coverage/grid/GridExtent.html" title="class in org.apache.sis.coverage.grid"><code>GridExtent</code></a>. |
| The OGC restriction against negative numbers is removed (Apache SIS accepts negative tile indices). |
| The <var>tile span</var> and <var>tile matrix min/max</var> coefficients are replaced by a more generic |
| "grid to CRS" <a href="http://www.geoapi.org/3.0/javadoc/org.opengis.geoapi/org/opengis/referencing/operation/MathTransform.html" title="class or interface in org.opengis.referencing.operation" class="external-link"><code>MathTransform</code></a>, usually affine but not necessarily. |
| Users may need to enforce above OGC restrictions themselves if compatibility with OGC specification is desired). |
| |
| |
| <h2>Relationship with Java2D rendered image</h2> |
| OGC tiles can be mapped to <a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.desktop/java/awt/image/RenderedImage.html#getTile(int,int)" title="class or interface in java.awt.image" class="external-link">Java2D tiles</a> |
| with the following restrictions: |
| |
| <ul> |
| <li>Java2D tile indices and pixel indices are 32 bits integer instead of 64 bits. |
| See <a href="../../coverage/grid/GridCoverage.html#render(org.apache.sis.coverage.grid.GridExtent)">grid coverage render</a> |
| (in particular the relative pixel coordinates) for the workaround applied in Apache SIS.</li> |
| <li>Java2D does not support coalescence coefficient (used in OGC tiles for compensating distortions near poles). |
| Tiles in Java2D are expanded as needed as if the <code>TileMatrix</code> had no coalescence.</li> |
| </ul></div> |
| <dl class="notes"> |
| <dt>Since:</dt> |
| <dd>1.2</dd> |
| |
| <p><font size="-1">Defined in the <code>sis-storage</code> module</font></p> |
| </dl> |
| </section> |
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| <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.storage</a></div> |
| <div class="col-last even-row-color"> |
| <div class="block"><a href="../DataStore.html" title="class in org.apache.sis.storage">Data store</a> base types for retrieving and saving geospatial data |
| in various storage formats.</div> |
| </div> |
| </div> |
| </div> |
| </li> |
| <li> |
| <div id="class-summary"> |
| <div class="table-tabs" role="tablist" aria-orientation="horizontal"><button id="class-summary-tab0" role="tab" aria-selected="true" aria-controls="class-summary.tabpanel" tabindex="0" onkeydown="switchTab(event)" onclick="show('class-summary', 'class-summary', 2)" class="active-table-tab">All Classes and Interfaces</button><button id="class-summary-tab1" role="tab" aria-selected="false" aria-controls="class-summary.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('class-summary', 'class-summary-tab1', 2)" class="table-tab">Interfaces</button><button id="class-summary-tab3" role="tab" aria-selected="false" aria-controls="class-summary.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('class-summary', 'class-summary-tab3', 2)" class="table-tab">Enum Classes</button></div> |
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| <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-tab1"><a href="Tile.html" title="interface in org.apache.sis.storage.tiling">Tile</a></div> |
| <div class="col-last even-row-color class-summary class-summary-tab1"> |
| <div class="block">A small hyper-rectangular representation of data which is part of a tiling scheme.</div> |
| </div> |
| <div class="col-first odd-row-color class-summary class-summary-tab1"><a href="TiledResource.html" title="interface in org.apache.sis.storage.tiling">TiledResource</a></div> |
| <div class="col-last odd-row-color class-summary class-summary-tab1"> |
| <div class="block">A resource which content can be accessed by smaller chunks called tiles.</div> |
| </div> |
| <div class="col-first even-row-color class-summary class-summary-tab1"><a href="TileMatrix.html" title="interface in org.apache.sis.storage.tiling">TileMatrix</a></div> |
| <div class="col-last even-row-color class-summary class-summary-tab1"> |
| <div class="block">A collection of tiles with the same size and properties placed on a regular grid with no overlapping.</div> |
| </div> |
| <div class="col-first odd-row-color class-summary class-summary-tab1"><a href="TileMatrixSet.html" title="interface in org.apache.sis.storage.tiling">TileMatrixSet</a></div> |
| <div class="col-last odd-row-color class-summary class-summary-tab1"> |
| <div class="block">A collection of <code>TileMatrix</code> in the same CRS but at different scale levels.</div> |
| </div> |
| <div class="col-first even-row-color class-summary class-summary-tab3"><a href="TileStatus.html" title="enum class in org.apache.sis.storage.tiling">TileStatus</a></div> |
| <div class="col-last even-row-color class-summary class-summary-tab3"> |
| <div class="block">Information about the availability of a tile.</div> |
| </div> |
| <div class="col-first odd-row-color class-summary class-summary-tab1"><a href="WritableTiledResource.html" title="interface in org.apache.sis.storage.tiling">WritableTiledResource</a></div> |
| <div class="col-last odd-row-color class-summary class-summary-tab1"> |
| <div class="block">A <code>TiledResource</code> that can write and delete tile matrix sets.</div> |
| </div> |
| <div class="col-first even-row-color class-summary class-summary-tab1"><a href="WritableTileMatrix.html" title="interface in org.apache.sis.storage.tiling">WritableTileMatrix</a></div> |
| <div class="col-last even-row-color class-summary class-summary-tab1"> |
| <div class="block">A <code>TileMatrix</code> that can write and delete tiles.</div> |
| </div> |
| <div class="col-first odd-row-color class-summary class-summary-tab1"><a href="WritableTileMatrixSet.html" title="interface in org.apache.sis.storage.tiling">WritableTileMatrixSet</a></div> |
| <div class="col-last odd-row-color class-summary class-summary-tab1"> |
| <div class="block">A <code>TileMatrixSet</code> that can write and delete tile matrices.</div> |
| </div> |
| </div> |
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| </div> |
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