private void initIndex() {
Directory dir = graph.getDirectory();
if (preciseIndexResolution > 0) {
Location2NodesNtree tmpIndex;
if (graph instanceof LevelGraph) {
tmpIndex = new Location2NodesNtreeLG((LevelGraph) graph, dir);
} else {
tmpIndex = new Location2NodesNtree(graph, dir);
}
tmpIndex.setResolution(preciseIndexResolution);
tmpIndex.setEdgeCalcOnFind(edgeCalcOnSearch);
tmpIndex.setSearchRegion(searchRegion);
index = tmpIndex;
} else {
index = new Location2IDQuadtree(graph, dir);
index.setResolution(Helper.calcIndexSize(graph.getBounds()));
}
if (!index.loadExisting()) {
index.prepareIndex();
}
}