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openlayers/edit/apidoc/ol.Projection.html
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<!DOCTYPE html>
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<title>OpenLayers 3 API Documentation - Class: ol.Projection</title>
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<header>
<h2>
<span class="ancestors"><a href="ol.html">ol</a>.</span>
ol.Projection
</h2>
</header>
<article>
<div class="container-overview">
<dt>
<h4 class="name" id="Projection"><span class="type-signature"></span>new Projection</h4>
</dt>
<dd>
<h5>Parameters:</h5>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>options</code></td>
<td class="type">
<span class="param-type"><a href="ol.html#ProjectionOptions">ol.ProjectionOptions</a></span>
</td>
<td class="description last"><p>Projection options.</p></td>
</tr>
</tbody>
</table>
<dl class="details">
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>proj.js, line 59</li></ul></dd>
</dl>
</dd>
</div>
<h3 class="subsection-title">Members</h3>
<dl>
<dt class="">
<h4 class="name" id="getPointResolution"><span class="type-signature"></span>getPointResolution<span class="type-signature"></span></h4>
</dt>
<dd class="">
<div class="description">
<p>Get the resolution of the point in degrees. For projections with degrees as
the unit this will simply return the provided resolution. For other
projections the point resolution is estimated by transforming the center
pixel to EPSG:4326, measuring its width and height on the normal sphere,
and taking the average of the width and height.</p>
</div>
<dl class="details">
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>proj.js, line 129</li></ul></dd>
</dl>
</dd>
</dl>
<h3 class="subsection-title">Methods</h3>
<dl>
<dt>
<h4 class="name" id="getAxisOrientation"><span class="type-signature"></span>getAxisOrientation</h4>
</dt>
<dd>
<div class="description">
<p>Get the axis orientation of this projection.
Example values are:
enu - the default easting, northing, elevation.
neu - northing, easting, up - useful for "lat/long" geographic coordinates,
or south orientated transverse mercator.
wnu - westing, northing, up - some planetary coordinate systems have
"west positive" coordinate systems</p>
</div>
<dl class="details">
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>proj.js, line 161</li></ul></dd>
</dl>
<h5>Returns:</h5>
<div class="param-desc">
<p>Axis orientation.</p>
</div>
<dl>
<dt>
Type
</dt>
<dd>
<span class="param-type">string</span>
</dd>
</dl>
</dd>
<dt>
<h4 class="name" id="getCode"><span class="type-signature"></span>getCode</h4>
</dt>
<dd>
<div class="description">
<p>Get the code for this projection, e.g. 'EPSG:4326'.</p>
</div>
<dl class="details">
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>proj.js, line 105</li></ul></dd>
</dl>
<h5>Returns:</h5>
<div class="param-desc">
<p>Code.</p>
</div>
<dl>
<dt>
Type
</dt>
<dd>
<span class="param-type">string</span>
</dd>
</dl>
</dd>
<dt>
<h4 class="name" id="getExtent"><span class="type-signature"></span>getExtent</h4>
</dt>
<dd>
<div class="description">
<p>Get the validity extent for this projection.</p>
</div>
<dl class="details">
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>proj.js, line 114</li></ul></dd>
</dl>
<h5>Returns:</h5>
<div class="param-desc">
<p>Extent.</p>
</div>
<dl>
<dt>
Type
</dt>
<dd>
<span class="param-type">ol.Extent</span>
</dd>
</dl>
</dd>
<dt>
<h4 class="name" id="getMetersPerUnit"><span class="type-signature"></span>getMetersPerUnit</h4>
</dt>
<dd>
<div class="description">
<p>Get the amount of meters per unit of this projection. If the projection is
not configured with a units identifier, the return is <code>undefined</code>.</p>
</div>
<dl class="details">
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>proj.js, line 146</li></ul></dd>
</dl>
<h5>Returns:</h5>
<div class="param-desc">
<p>Meters.</p>
</div>
<dl>
<dt>
Type
</dt>
<dd>
<span class="param-type">number</span>
|
<span class="param-type">undefined</span>
</dd>
</dl>
</dd>
<dt>
<h4 class="name" id="getUnits"><span class="type-signature"></span>getUnits</h4>
</dt>
<dd>
<div class="description">
<p>Get the units of this projection.</p>
</div>
<dl class="details">
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>proj.js, line 136</li></ul></dd>
</dl>
<h5>Returns:</h5>
<div class="param-desc">
<p>Units.</p>
</div>
<dl>
<dt>
Type
</dt>
<dd>
<span class="param-type"><a href="ol.html#ProjectionUnits">ol.ProjectionUnits</a></span>
</dd>
</dl>
</dd>
<dt>
<h4 class="name" id="isGlobal"><span class="type-signature"></span>isGlobal</h4>
</dt>
<dd>
<div class="description">
<p>Is this projection a global projection which spans the whole world?</p>
</div>
<dl class="details">
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>proj.js, line 170</li></ul></dd>
</dl>
<h5>Returns:</h5>
<div class="param-desc">
<p>Wether the projection is global.</p>
</div>
<dl>
<dt>
Type
</dt>
<dd>
<span class="param-type">boolean</span>
</dd>
</dl>
</dd>
</dl>
</article>
</section>
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href="ol.tilegrid.XYZ.html">ol.tilegrid.XYZ</a></li></ul><h3>Namespaces</h3><ul><li><a href="ol.html">ol</a></li><li><a href="ol.animation.html">ol.animation</a></li><li><a href="ol.control.html">ol.control</a></li><li><a href="ol.expr.html">ol.expr</a></li><li><a href="ol.geom.html">ol.geom</a></li><li><a href="ol.layer.html">ol.layer</a></li><li><a href="ol.parser.html">ol.parser</a></li><li><a href="ol.proj.html">ol.proj</a></li><li><a href="ol.source.html">ol.source</a></li><li><a href="ol.style.html">ol.style</a></li><li><a href="ol.tilegrid.html">ol.tilegrid</a></li></ul><h3>Tutorials</h3><ul><li><a href="tutorial-ol3.html">OpenLayers 3 Architecture</a></li></ul><h3>Global</h3><ul><li><a href="global.html#Meters per unit lookup table.">Meters per unit lookup table.</a></li><li><a href="global.html#grid">grid</a></li><li>{boolean}</li><li>{number}</li><li>{string}</li></ul>
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