spatial.layerMeta

Procedure

Returns the layer details for the given layer name

Signature

spatial.layerMeta(name :: STRING) :: (name :: STRING, geometryType :: STRING, crs :: STRING, hasComplexAttributes :: BOOLEAN, extraAttributes :: MAP)

Input parameters

Name Type Default Description

name

STRING

null

The name of the layer

Output parameters

Name Type Description

name

STRING

The name of the layer

geometryType

STRING

The class name of the jts geometry, e.g. org.locationtech.jts.geom.Point

crs

STRING

The CRS in geotools format, e.g. WGS84(DD)

hasComplexAttributes

BOOLEAN

If true the feature-attributes are complex (defined by the encoder) and must be read form the node via spatial.extractAttributes

extraAttributes

MAP

Additional attributes of the Layer

Examples

Get metadata about a layer

CALL spatial.addPointLayer('meta_layer', 'rtree', 'wgs84') YIELD node
Table 1. Result
node 
(:SpatialLayer {
    geomencoder: "org.neo4j.gis.spatial.encoders.SimplePointEncoder",
    index_class: "org.neo4j.gis.spatial.index.LayerRTreeIndex",
    layer: "meta_layer",
    layer_class: "org.neo4j.gis.spatial.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\"]]"
})

Add points at opposite corners

CREATE (n1:Point {latitude: 60.0, longitude: 15.0, name: 'southwest'})
WITH n1
CALL spatial.addNode('meta_layer', n1) YIELD node
RETURN node
CALL spatial.layerMeta('meta_layer') YIELD name, geometryType, crs, hasComplexAttributes, extraAttributes
Table 2. Result
crs extraAttributes geometryType hasComplexAttributes name

GEOGCS["WGS84(DD)", DATUM["WGS84", SPHEROID["WGS84", 6378137.0, 298.257223563]], PRIMEM["Greenwich", 0.0], UNIT["degree", 0.017453292519943295], AXIS["Geodetic longitude", EAST], AXIS["Geodetic latitude", NORTH], AUTHORITY["EPSG","4326"]]a

[source] ---- { "name" : "java.lang.String" } ----

org.locationtech.jts.geom.Pointa

[source] ---- false ----

meta_layer