如何在neo4j中创建geohash树

问题描述

基于问题

解决方案

如果您希望将图中的树形结构作为索引，您需要使用RTree索引（这是Neo4j Spatial中的默认值）。如果您想要一个geohash索引，则图形中将不会有任何树，因为geohhes会以字符串形式存储在lucene索引中，用于字符串前缀搜索。字符串前缀搜索是搜索基于geohash的索引的常用方法。

Based on a problem here an expert have answered with this code:

CALL spatial.addPointLayerGeohash('my_geohash_layer_name')
CREATE (n:Node {latitude:60.1,longitude:15.2}) WITH n
CALL spatial.addNode('my_geohash_layer_name',n) YIELD node
RETURN node

to create a geohash tree that organise spatial nodes.

so i tried that with two spatial nodes but unlike R-tree the spatial nodes aren't linked to the layer with any connection !? is this code true ? or what is wrong ?

解决方案

If you want an in-graph tree structure as an index, you need to use the RTree index (which is the default in Neo4j Spatial). If you want a geohash index, there will be no tree in the graph because geohashes are being stored as strings in a lucene index for string prefix searches. String prefix searches are a common way of searching geohash based indexes.

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