XSD-KML¶
KML schema and bindings for gt-xml allowing the handling of FeatureCollection
and Feature content.
References:
KML Parsing¶
KML is handled in a little bit of an unusual fashion as it defines a data structure of nested features, and includes Style information.
Here is a fragment from the
states.kml file
we use in our test cases:
<?xml version="1.0" encoding="UTF-8"?>
<kml>
<Document>
<name>topp:states</name>
<Style id="GeoServerStylestates.1">
<IconStyle>
<scale>0.2</scale>
<Icon>
<href>http://maps.google.com/mapfiles/kml/pal3/icon61.png</href>
</Icon>
</IconStyle>
<PolyStyle>
<color>b2ff4d4d</color>
<outline>1</outline>
</PolyStyle>
<LineStyle>
<color>ff000000</color>
<width>1</width>
</LineStyle>
<LabelStyle>
<color>ffffffff</color>
</LabelStyle>
</Style>
<Placemark>
<name><![CDATA[Illinois
]]></name>
<description><![CDATA[This is the state of Illinois.
11430602 people live in an area of 143986.61 square
kilometers, and only 538071 take public transportation.
<br>
<br>
Map by:<br> <a href="http://topp.openplans.org/geoserver"><img alt="TOPP" src="http://topp.openplans.org/images/logo.jpg"></a>
]]></description>
<LookAt>
<longitude>-89.20368628698026</longitude>
<latitude>40.06397152717181</latitude>
<range>700</range>
<tilt>10.0</tilt>
<heading>10.0</heading>
</LookAt>
<styleUrl>#GeoServerStylestates.1</styleUrl>
<MultiGeometry>
<Point>
<coordinates>-89.20368628698026,40.06397152717181</coordinates>
</Point>
<Polygon>
<outerBoundaryIs>
<LinearRing>
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</LinearRing>
</outerBoundaryIs>
</Polygon>
</MultiGeometry>
</Placemark>
...
The Parser can use the KMLConfiguration to read out the contents of a KML file as a single Feature.
Accessing the placemarks of that Feature returns a Collection<Feature>:
Parser parser = new Parser(new KMLConfiguration());
SimpleFeature f = (SimpleFeature) parser.parse( inputStream );
Collection placemarks = (Collection) f.getAttribute("Feature");
The Streaming Parser is also available:
StreamingParser parser = new StreamingParser( inputStream, KML.Placemark);
SimpleFeature f = null;
while ((f = (SimpleFeature) parser.parse()) != null) {
FeatureTypeStyle style = (FeatureTypeStyle) f.getAttribute("Style");
Symbolizer[] syms = style.getRules()[0].getSymbolizers();
assertEquals(3, syms.length);
}
KML Encoding¶
The KMLConfiguration provides the Encoder with the ability to generate KML output:
Encoder encoder = new Encoder(new KMLConfiguration());
encoder.setIndenting(true);
encoder.encode(featureCollection, KML.kml, outputstream );
It can also work on a single Feature.