ST_3DDWithin
Name
ST_3DDWithin — For 3d (z) geometry type Returns true if two geometries 3d distance is within number of units.
Synopsis
boolean
ST_3DDWithin
(
geometry
g1
, geometry
g2
, double precision
distance_of_srid
)
;
Description
For geometry type returns true if the 3d distance between two objects is within distance_of_srid specified projected units (spatial ref units).
This function supports 3d and will not drop the z-index.
This function supports Polyhedral surfaces.
This method implements the SQL/MM specification. SQL-MM ?
Availability: 2.0.0
Examples
-- Geometry example - units in meters (SRID: 2163 US National Atlas Equal area) (3D point and line compared 2D point and line)
-- Note: currently no vertical datum support so Z is not transformed and assumed to be same units as final.
SELECT ST_3DDWithin(
ST_Transform(ST_GeomFromEWKT('SRID=4326;POINT(-72.1235 42.3521 4)'),2163),
ST_Transform(ST_GeomFromEWKT('SRID=4326;LINESTRING(-72.1260 42.45 15, -72.123 42.1546 20)'),2163),
126.8
) As within_dist_3d,
ST_DWithin(
ST_Transform(ST_GeomFromEWKT('SRID=4326;POINT(-72.1235 42.3521 4)'),2163),
ST_Transform(ST_GeomFromEWKT('SRID=4326;LINESTRING(-72.1260 42.45 15, -72.123 42.1546 20)'),2163),
126.8
) As within_dist_2d;
within_dist_3d | within_dist_2d
----------------+----------------
f | t