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<a href='#working-with-geojson-data' class='anchor' aria-hidden=true><span class="header-anchor"></span></a><h1 id='working-with-geojson-data'>Working with GeoJSON Data</h1>
<p>This SDK offers several ways to work with <a href="http://geojson.org/">GeoJSON</a> files.
GeoJSON is a standard file format for representing geographic data.</p>
<a href='#adding-a-geojson-file-to-the-map' class='anchor' aria-hidden=true><span class="header-anchor"></span></a><h2 id='adding-a-geojson-file-to-the-map'>Adding a GeoJSON file to the map</h2>
<p>You can use
<a href="https://www.mapbox.com/studio/datasets/">Mapbox Studio’s Datasets editor</a> to
upload a GeoJSON file and include it in your custom map style. The GeoJSON data
will be hosted on Mapbox servers. When a user loads your style, the SDK
automatically loads the GeoJSON data for display.</p>
<p>Alternatively, if you need to host the GeoJSON file elsewhere or bundle it with
your application, you can use a GeoJSON file as the basis of an <code>MGLShapeSource</code>
object. Pass the file’s URL into the
<code>-[MGLShapeSource initWithIdentifier:URL:options:]</code> initializer and add the
shape source to the map using the <code>-[MGLStyle addSource:]</code> method. The URL may
be a local file URL, an HTTP URL, or an HTTPS URL.</p>
<p>Once you’ve added the GeoJSON file to the map via an <code>MGLShapeSource</code> object,
you can configure the appearance of its data and control what data is visible
using <code>MGLStyleLayer</code> objects, you can
<a href="#extracting-geojson-data-from-the-map">access the data programmatically</a>.</p>
<a href='#converting-geojson-data-into-shape-objects' class='anchor' aria-hidden=true><span class="header-anchor"></span></a><h2 id='converting-geojson-data-into-shape-objects'>Converting GeoJSON data into shape objects</h2>
<p>If you have GeoJSON data in the form of source code (also known as “GeoJSON
text”), you can convert it into an <code>MGLShape</code>, <code>MGLFeature</code>, or
<code>MGLShapeCollectionFeature</code> object that the <code>MGLShapeSource</code> class understands
natively. First, create an <code>NSData</code> object out of the source code string or file
contents, then pass that data object into the
<code>+[MGLShape shapeWithData:encoding:error:]</code> method. Finally, you can pass the
resulting shape or feature object into the
<code>-[MGLShapeSource initWithIdentifier:shape:options:]</code> initializer and add it to
the map, or you can use the object and its properties to power non-map-related
functionality in your application.</p>
<p>To include multiple shapes in the source, create and pass an <code>MGLShapeCollection</code> or
<code>MGLShapeCollectionFeature</code> object to
<code>-[MGLShapeSource initWithIdentifier:shape:options:]</code>. Alternatively, use the
<code>-[MGLShapeSource initWithIdentifier:features:options:]</code> or
<code>-[MGLShapeSource initWithIdentifier:shapes:options:]</code> method to create a shape source
with an array. <code>-[MGLShapeSource initWithIdentifier:features:options:]</code> accepts only <code>MGLFeature</code>
instances, such as <code>MGLPointFeature</code> objects, whose attributes you can use when
applying a predicate to <code>MGLVectorStyleLayer</code> or configuring a style layer’s
appearance.</p>
<a href='#extracting-geojson-data-from-the-map' class='anchor' aria-hidden=true><span class="header-anchor"></span></a><h2 id='extracting-geojson-data-from-the-map'>Extracting GeoJSON data from the map</h2>
<p>Any <code>MGLShape</code>, <code>MGLFeature</code>, or <code>MGLShapeCollectionFeature</code> object has an
<code>-[MGLShape geoJSONDataUsingEncoding:]</code> method that you can use to create a
GeoJSON source code representation of the object. You can extract a feature
object from the map using a method such as
<code>-[MGLMapView visibleFeaturesAtPoint:]</code>.</p>
<a href='#about-geojson-deserialization' class='anchor' aria-hidden=true><span class="header-anchor"></span></a><h2 id='about-geojson-deserialization'>About GeoJSON deserialization</h2>
<p>The process of converting GeoJSON text into <code>MGLShape</code>, <code>MGLFeature</code>, or
<code>MGLShapeCollectionFeature</code> objects is known as “GeoJSON deserialization”.
GeoJSON geometries, features, and feature collections are known in this SDK as
shapes, features, and shape collection features, respectively.</p>
<p>Each GeoJSON object type corresponds to a type provided by either this SDK or
the Core Location framework:</p>
<table><thead>
<tr>
<th>GeoJSON object type</th>
<th>SDK type</th>
</tr>
</thead><tbody>
<tr>
<td><code>Position</code> (longitude, latitude)</td>
<td><code>CLLocationCoordinate2D</code> (latitude, longitude)</td>
</tr>
<tr>
<td><code>Point</code></td>
<td><code>MGLPointAnnotation</code></td>
</tr>
<tr>
<td><code>MultiPoint</code></td>
<td><code>MGLPointCollection</code></td>
</tr>
<tr>
<td><code>LineString</code></td>
<td><code>MGLPolyline</code></td>
</tr>
<tr>
<td><code>MultiLineString</code></td>
<td><code>MGLMultiPolyline</code></td>
</tr>
<tr>
<td><code>Polygon</code></td>
<td><code>MGLPolygon</code></td>
</tr>
<tr>
<td>Linear ring</td>
<td><code>MGLPolygon.coordinates</code>, <code>MGLPolygon.interiorPolygons</code></td>
</tr>
<tr>
<td><code>MultiPolygon</code></td>
<td><code>MGLMultiPolygon</code></td>
</tr>
<tr>
<td><code>GeometryCollection</code></td>
<td><code>MGLShapeCollection</code></td>
</tr>
<tr>
<td><code>Feature</code></td>
<td><code>MGLFeature</code></td>
</tr>
<tr>
<td><code>FeatureCollection</code></td>
<td><code>MGLShapeCollectionFeature</code></td>
</tr>
</tbody></table>
<p>A <code>Feature</code> object in GeoJSON corresponds to an instance of an <code>MGLShape</code>
subclass conforming to the <code>MGLFeature</code> protocol. There is a distinct
<code>MGLFeature</code>-conforming class for each type of geometry that a GeoJSON feature
can contain. This allows features to be used as shapes where convenient. For
example, some features can be added to a map view as annotations.</p>
<p>In contrast to the GeoJSON standard, it is possible for <code>MGLShape</code> subclasses
other than <code>MGLPointAnnotation</code> to straddle the antimeridian.</p>
<p>The following GeoJSON data types correspond straightforwardly to Foundation data
types when they occur as feature identifiers or property values:</p>
<table><thead>
<tr>
<th>GeoJSON data type</th>
<th>Objective-C representation</th>
<th>Swift representation</th>
</tr>
</thead><tbody>
<tr>
<td><code>null</code></td>
<td><code>NSNull</code></td>
<td><code>NSNull</code></td>
</tr>
<tr>
<td><code>true</code>, <code>false</code></td>
<td><code>NSNumber.boolValue</code></td>
<td><code>Bool</code></td>
</tr>
<tr>
<td>Integer</td>
<td><code>NSNumber.unsignedLongLongValue</code>, <code>NSNumber.longLongValue</code></td>
<td><code>UInt64</code>, <code>Int64</code></td>
</tr>
<tr>
<td>Floating-point number</td>
<td><code>NSNumber.doubleValue</code></td>
<td><code>Double</code></td>
</tr>
<tr>
<td>String</td>
<td><code>NSString</code></td>
<td><code>String</code></td>
</tr>
</tbody></table>
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