llerradyoh / neo4j-spatial

Neo4j Spatial is a library of utilities for Neo4j that faciliates the enabling of spatial operations on data. In particular you can add spatial indexes to already located data, and perform spatial operations on the data like searching for data within specified regions or within a specified distance of a point of interest. In addition classes are provided to expose the data to geotools and thereby to geotools enabled applications like geoserver and uDig.

Neo4j Spatial

This is a first prototype of a library to store spatial data in the Neo4j open source graph database. You can import geometries from a shapefile and perform spatial searches.

The most common 2D geometries are supported:

• (multi) point
• (multi) linestring
• (multi) polygon

Spatial queries implemented:

• Contain
• Cover
• Covered By
• Cross
• Disjoint
• Intersect
• Intersect Window
• Overlap
• Touch
• Within
• Within Distance

Building

You need a Java 6 environment, Neo4J, JTS and GeoTools:

• jta-1.1.jar
• neo4j-kernel-1.0.jar
• neo4j-commons-1.0.jar
• jts-1.10.jar
• geoapi-2.3-M1.jar
• gt-api-2.6.3.jar
• gt-shapefile-2.6.3.jar
• gt-main-2.6.3.jar
• gt-metadata-2.6.3.jar
• gt-data-2.6.3.jar

Importing a shapefile

Spatial data is divided in Layers and indexed by a RTree.

GraphDatabaseService database = new EmbeddedGraphDatabase(storeDir);
try {
	ShapefileImporter importer = new ShapefileImporter(database);
    importer.importShapefile("roads.shp", "layer_roads");
} finally {
	database.shutdown();
}

Executing a spatial query

GraphDatabaseService database = new EmbeddedGraphDatabase(storeDir);
try {
	Transaction tx = database.beginTx();
    try {
    	SpatialDatabaseService spatialService = new SpatialDatabaseService(database);
        Layer layer = spatialService.getLayer("layer_roads");
        SpatialIndexReader spatialIndex = layer.getIndex();
        	
        Search searchQuery = new SearchIntersectWindow(new Envelope(xmin, xmax, ymin, ymax));
        spatialIndex.executeSearch(searchQuery);
	    List<SpatialDatabaseRecord> results = searchQuery.getResults();
	       	
		tx.success();
	} finally {
    	tx.finish();
    }	        	        	
} finally {
	database.shutdown();
}