@mapbox/geojson-area

What is @mapbox/geojson-area?

@mapbox/geojson-area is an npm package that provides utilities for calculating the area of GeoJSON geometries. It is particularly useful for geographic data analysis and manipulation, allowing developers to easily compute the area of various GeoJSON shapes such as polygons and multipolygons.

What are @mapbox/geojson-area's main functionalities?

Calculate Area of a Polygon

This feature allows you to calculate the area of a GeoJSON Polygon. The code sample demonstrates how to define a polygon and use the `geometry` method from @mapbox/geojson-area to compute its area.

const geojsonArea = require('@mapbox/geojson-area');
const polygon = {
  "type": "Polygon",
  "coordinates": [
    [
      [-122.681944, 45.520247],
      [-122.681944, 45.523123],
      [-122.678944, 45.523123],
      [-122.678944, 45.520247],
      [-122.681944, 45.520247]
    ]
  ]
};
const area = geojsonArea.geometry(polygon);
console.log(area);

Calculate Area of a MultiPolygon

This feature allows you to calculate the area of a GeoJSON MultiPolygon. The code sample demonstrates how to define a multipolygon and use the `geometry` method from @mapbox/geojson-area to compute its area.

const geojsonArea = require('@mapbox/geojson-area');
const multiPolygon = {
  "type": "MultiPolygon",
  "coordinates": [
    [
      [
        [-122.681944, 45.520247],
        [-122.681944, 45.523123],
        [-122.678944, 45.523123],
        [-122.678944, 45.520247],
        [-122.681944, 45.520247]
      ]
    ],
    [
      [
        [-122.671944, 45.510247],
        [-122.671944, 45.513123],
        [-122.668944, 45.513123],
        [-122.668944, 45.510247],
        [-122.671944, 45.510247]
      ]
    ]
  ]
};
const area = geojsonArea.geometry(multiPolygon);
console.log(area);

Calculate Area of a Feature Collection

This feature allows you to calculate the area of a GeoJSON Feature Collection. The code sample demonstrates how to define a feature collection and use the `geometry` method from @mapbox/geojson-area to compute its area.

const geojsonArea = require('@mapbox/geojson-area');
const featureCollection = {
  "type": "FeatureCollection",
  "features": [
    {
      "type": "Feature",
      "geometry": {
        "type": "Polygon",
        "coordinates": [
          [
            [-122.681944, 45.520247],
            [-122.681944, 45.523123],
            [-122.678944, 45.523123],
            [-122.678944, 45.520247],
            [-122.681944, 45.520247]
          ]
        ]
      }
    },
    {
      "type": "Feature",
      "geometry": {
        "type": "Polygon",
        "coordinates": [
          [
            [-122.671944, 45.510247],
            [-122.671944, 45.513123],
            [-122.668944, 45.513123],
            [-122.668944, 45.510247],
            [-122.671944, 45.510247]
          ]
        ]
      }
    }
  ]
};
const area = geojsonArea.geometry(featureCollection);
console.log(area);

Other packages similar to @mapbox/geojson-area

turf

Turf is a powerful geospatial analysis library for JavaScript. It provides a wide range of spatial operations, including area calculations, distance measurements, and more. Compared to @mapbox/geojson-area, Turf offers a broader set of functionalities beyond just area calculations.

geojson-utils

geojson-utils is a utility library for working with GeoJSON data. It includes functions for calculating distances, areas, and other spatial operations. While it offers similar area calculation capabilities as @mapbox/geojson-area, it also provides additional utilities for other types of spatial analysis.

geolib

geolib is a library for geospatial calculations in JavaScript. It supports a variety of operations, including distance and area calculations, bounding box computations, and more. Compared to @mapbox/geojson-area, geolib provides a more comprehensive set of geospatial tools.

README

geojson-area

Calculate the area inside of any GeoJSON geometry.

usage

npm install @mapbox/geojson-area

example

var geojsonArea = require('@mapbox/geojson-area');

var area = geojsonArea.geometry(obj);

api

geojsonArea.geometry(obj)

Given a Geometry object, return contained area as square meters. Invalid input will return null.

Adapted from OpenLayers

Changelog

0.2.2 (2016-12-19)

Bug Fixes

• algorithm: Avoid accidental global i, fixes use strict (1646944)