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Geospatial Indexing and Query for Apache Lucene

There is a newer version: 8.4.1

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
 
/** 
 * This package is about SpatialPrefixTree and any supporting classes.
 * A SpatialPrefixTree supports spatial indexing by index-time tokens
 * where adding characters to a string gives greater resolution.
 * 
 * Potential Implementations include:
 * 

 * http://en.wikipedia.org/wiki/Quadtree
 * 
http://en.wikipedia.org/wiki/Geohash
 * 
http://healpix.jpl.nasa.gov/
 * 
 */
package org.apache.lucene.spatial.prefix.tree;