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javajts

Minimal Bounding Rectangle with JTS

I've got a collection of geometry objects. Now i want to calculate the minimal bounding rectangle from the whole collection. i'm using the java topology suite, but I can't figure out how to do this?

Solution

  • Have a look in http://tsusiatsoftware.net/jts/javadoc/index.html

    If I assume you are using a GeometryCollection instance. If it's true, you can directly call

    geometry.getEnvelope();

    or 

    geometry.getEnvelopeInternal();

    If you want an Envelope instance

    It will return you the minimum rectangle of the GeometryCollection.

    If you have a collection of Geometries, you can use an envelope directly, and expand it each time you process a new geometryc of your collection.

    Envelope env = new Envelope();
for(Geometry g : mySet){
  env.expandToInclude(g.getEnvelopeInternal()):
}

    or 

    Envelope env = new Envelope();
for(Geometry g : mySet){
  env.expandToInclude(g.getBoundary().getEnvelopeInternal()):
}