ST_Is3d

Definition

ST_Is3d takes an ST_Geometry as an input parameter and returns 1 (Oracle) or t (PostgreSQL) if the given geometry has z-coordinates; otherwise, it returns 0 (Oracle) or f (PostgreSQL).

Syntax

sde.st_is3d (g1 sde.st_geometry)

Return type

Boolean

Example

This example creates a table, is3d_test, and populates it with records.

CREATE TABLE is3d_test (id integer, geo sde.st_geometry);

INSERT INTO IS3D_TEST VALUES (
1902,
sde.st_geometry ('polygon ((40 120, 90 120, 90 150, 40 150, 40 120))', 0)
);

INSERT INTO IS3D_TEST VALUES (
1903,
sde.st_geometry ('multipoint m(10 10 5, 50 10 6, 10 30 8)' , 0)
);

INSERT INTO IS3D_TEST VALUES (
1904,
sde.st_geometry ('linestring z(10 10 166, 20 10 168)', 0)
);

INSERT INTO IS3D_TEST VALUES (
1905,
sde.st_geometry ('point zm(10 10 16 30)', 0)
);

Next, using ST_Is3d, check to see whether any of the records has a z-coordinate.

Oracle

SELECT id, sde.st_is3d (geo) Is_3D
FROM IS3D_TEST;

        ID      IS_3D

      1902          0
      1903          0
      1904          1
      1905          1

PostgreSQL

SELECT id, sde.st_is3d (geo) 
AS Is_3D
FROM is3d_test;

        id      is_3d

      1902          f
      1903          f
      1904          t
      1905          t