planepoint

描述

¥Description

Takes a triangular plane as a polygon and a point within that triangle, and returns the z-value at that point.

The Polygon should have properties a, b, and c that define the values at its three corners.Alternatively, the z-values of each triangle point can be provided by their respective 3rd coordinate if their values are not provided as properties.

参数

¥Parameters

名称	类型	描述
point	坐标系	the Point for which a z-value will be calculated
triangle	特性<多边形>	a Polygon feature with three vertices

返回

¥Returns

number the z-value for interpolatedPoint

示例

¥Examples

const point = turf.point([-75.3221, 39.529]);
// "a", "b", and "c" values represent the values of the coordinates in order.
const triangle = turf.polygon(
  [
    [
      [-75.1221, 39.57],
      [-75.58, 39.18],
      [-75.97, 39.86],
      [-75.1221, 39.57],
    ],
  ],
  {
    a: 11,
    b: 122,
    c: 44,
  },
);

const zValue = turf.planepoint(point, triangle);
point.properties.zValue = zValue;

安装

¥Installation

$ npm install @turf/planepoint

import { planepoint } from "@turf/planepoint";
const result = planepoint(...);

$ npm install @turf/turf

import * as turf from "@turf/turf";
const result = turf.planepoint(...);