LinestringZ and LinestringM Data Types
LinestringZ and LinestringM have the same properties as Linestring but with one additional ordinate. LinestringZ adds an elevation ordinate, LinestringM adds a measurement ordinate.
Examples:
Without specifying SRID:
CREATE TABLE trails (name VARCHAR(30), path LINESTRINGZ);
CREATE TABLE roads (name VARCHAR(30), road LINESTRINGM);
With specifying SRID:
CREATE TABLE trails (name VARCHAR(30), path LINESTRINGZ SRID 4326);
CREATE TABLE roads (name VARCHAR(30), road LINESTRINGM SRID 4326);
Use linestrings to represent the path that slopes downward:
CREATE TABLE paths (id INTEGER PRIMARY KEY, path LINESTRINGZ NOT NULL);
INSERT INTO paths (id, path) VALUES (1, GEOMZFROMTEXT('LINESTRINGZ(0 0 20, 10 0 10, 10 10 -10)'));
Use linestrings to represent a road with measurement markers.
CREATE TABLE roads (id INTEGER PRIMARY KEY, road LINESTRINGM NOT NULL);
INSERT INTO roads (id, road) VALUES (1, GEOMMFROMTEXT('LINESTRINGM(0 0 0, 10 0 20, 10 10 -40)'));
Last modified date: 08/28/2024