spatial.addPointLayerGeohash

过程

添加一个基于 geohash 索引的新简单点图层，返回该图层的根节点

签名

spatial.addPointLayerGeohash(name :: STRING, crsName = wgs84 :: STRING, indexConfig =  :: STRING) :: (node :: NODE)

输入参数

名称类型默认描述

名称	类型	默认	描述
名称 (name)	STRING	null	层的名称
crsName	STRING	"wgs84"	要使用的坐标参考系统（CRS），有效值为：`wgs84`
indexConfig	STRING	""	新创建的索引的配置

名称 (name)

STRING

null

层的名称

crsName

STRING

"wgs84"

要使用的坐标参考系统（CRS），有效值为：wgs84

indexConfig

STRING

新创建的索引的配置

输出参数

名称	类型	描述
节点	NODE

名称

类型

描述

节点

NODE

示例

创建一个用于索引节点的图层

CALL spatial.addPointLayerGeohash('my-simple-geohash-layer')

节点

表 1. 结果
节点
`(:SpatialLayer { geomencoder: "SimplePointEncoder", index_type: "geohash", layer: "my-simple-geohash-layer", layer_type: "SimplePointLayer", layercrs: "GEOGCS[\"WGS84(DD)\", \n DATUM[\"WGS84\", \n SPHEROID[\"WGS84\", 6378137.0, 298.257223563]], \n PRIMEM[\"Greenwich\", 0.0], \n UNIT[\"degree\", 0.017453292519943295], \n AXIS[\"Geodetic longitude\", EAST], \n AXIS[\"Geodetic latitude\", NORTH], \n AUTHORITY[\"EPSG\",\"4326\"]]" })`

(:SpatialLayer {
    geomencoder: "SimplePointEncoder",
    index_type: "geohash",
    layer: "my-simple-geohash-layer",
    layer_type: "SimplePointLayer",
    layercrs: "GEOGCS[\"WGS84(DD)\", \n  DATUM[\"WGS84\", \n    SPHEROID[\"WGS84\", 6378137.0, 298.257223563]], \n  PRIMEM[\"Greenwich\", 0.0], \n  UNIT[\"degree\", 0.017453292519943295], \n  AXIS[\"Geodetic longitude\", EAST], \n  AXIS[\"Geodetic latitude\", NORTH], \n  AUTHORITY[\"EPSG\",\"4326\"]]"
})

创建要索引的节点

CREATE (n:Node {id: 42, latitude:60.1,longitude:15.2}) SET n.location=point(n) RETURN n

索引节点

MATCH (n:Node) WITH n CALL spatial.addNode('my-simple-geohash-layer',n) YIELD node RETURN node

节点

表 2. 结果
节点
`(:Node:SpatialIndex_geohash_my-simple-geohash-layer { _spatialindex_geohash_my-simple-geohash-layer: "1110001001100110011110101101011110001011101011010001000100011101", bbox: [ 15.2, 60.1, 15.2, 60.1 ], gtype: 1, id: 42, latitude: 60.1, location: point({x: 15.2, y: 60.1, crs: 'wgs-84'}), longitude: 15.2 })`

(:Node:SpatialIndex_geohash_my-simple-geohash-layer {
    _spatialindex_geohash_my-simple-geohash-layer: "1110001001100110011110101101011110001011101011010001000100011101",
    bbox: [ 15.2, 60.1, 15.2, 60.1 ],
    gtype: 1,
    id: 42,
    latitude: 60.1,
    location: point({x: 15.2, y: 60.1, crs: 'wgs-84'}),
    longitude: 15.2
})

在指定距离内查找节点

CALL spatial.withinDistance('my-simple-geohash-layer',{lon:15.0,lat:60.0},100)

距离节点

表 3. 结果
距离	节点
`15.713441434310283`	`(:Node:SpatialIndex_geohash_my-simple-geohash-layer { _spatialindex_geohash_my-simple-geohash-layer: "1110001001100110011110101101011110001011101011010001000100011101", bbox: [ 15.2, 60.1, 15.2, 60.1 ], gtype: 1, id: 42, latitude: 60.1, location: point({x: 15.2, y: 60.1, crs: 'wgs-84'}), longitude: 15.2 })`

15.713441434310283

(:Node:SpatialIndex_geohash_my-simple-geohash-layer {
    _spatialindex_geohash_my-simple-geohash-layer: "1110001001100110011110101101011110001011101011010001000100011101",
    bbox: [ 15.2, 60.1, 15.2, 60.1 ],
    gtype: 1,
    id: 42,
    latitude: 60.1,
    location: point({x: 15.2, y: 60.1, crs: 'wgs-84'}),
    longitude: 15.2
})