| <!-- |
| Licensed to the Apache Software Foundation (ASF) under one |
| or more contributor license agreements. See the NOTICE file |
| distributed with this work for additional information |
| regarding copyright ownership. The ASF licenses this file |
| to you under the Apache License, Version 2.0 (the |
| "License"); you may not use this file except in compliance |
| with the License. You may obtain a copy of the License at |
| |
| http://www.apache.org/licenses/LICENSE-2.0 |
| |
| Unless required by applicable law or agreed to in writing, |
| software distributed under the License is distributed on an |
| "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| KIND, either express or implied. See the License for the |
| specific language governing permissions and limitations |
| under the License. |
| --> |
| |
| # ST_M |
| |
| Introduction: Returns M Coordinate of given Point, null otherwise. |
| |
|  |
| |
| Format: `ST_M(geom: Geometry)` |
| |
| Return type: `Double` |
| |
| Since: `v1.6.1` |
| |
| SQL Example |
| |
| ```sql |
| SELECT ST_M(ST_MakePoint(1, 2, 3, 4)) |
| ``` |
| |
| Output: |
| |
| ``` |
| 4.0 |
| ``` |
