Huge News!Announcing our $40M Series B led by Abstract Ventures.Learn More
Socket
Sign inDemoInstall
Socket

geojson-utils

Package Overview
Dependencies
Maintainers
1
Versions
8
Alerts
File Explorer

Advanced tools

Socket logo

Install Socket

Detect and block malicious and high-risk dependencies

Install

geojson-utils

GeoJSON Utilities for JavaScript

  • 1.1.0
  • latest
  • Source
  • npm
  • Socket score

Version published
Weekly downloads
9.4K
decreased by-13.71%
Maintainers
1
Weekly downloads
 
Created
Source

GeoJSON Utilities for JavaScript

Here you will find some functions to help you manipulate and work with GeoJSON objects.

Some algorithms adapted from bjwbell/canvas-geolib

How to use!

Load up in a browser OR npm install geojson-utils

var gju = require('geojson-utils');

You now have an object named gju that contains all of the helper functions.

Remember, GeoJSON coordinates are ordered [x,y] or [longitude,latitude] to comply with the Open Geospatial Consortium's recommendation!

Line intersections

gju.linesIntersect({ "type": "LineString", "coordinates": [[0, 2], [5, 2]] },
                 { "type": "LineString", "coordinates": [[3, 0], [3, 4], [4,4], [4,0]] })
// [{"type":"Point","coordinates":[2,3]},{"type":"Point","coordinates":[2,4]}]

gju.linesIntersect({ "type": "LineString", "coordinates": [[0, 2], [5, 2]] },
                 { "type": "LineString", "coordinates": [[0, 0], [5, 0]] })
// false

Point in polygon

gju.pointInPolygon({"type":"Point","coordinates":[3,3]},
                 {"type":"Polygon", "coordinates":[[[0,0],[6,0],[6,6],[0,6]]]})
// [{"type":"Point","coordinates":[3,3]}]
gju.pointInPolygon({"type":"Point","coordinates":[-1,-1]},
                 {"type":"Polygon", "coordinates":[[[0,0],[6,0],[6,6],[0,6]]]})
// false

Radius filtering

If you retrieve a bunch of results from a bounding box query (common with R-tree geo DBs), but you want to filter the rectangular result set by circular radius:

// get the center of the original bounding box
var center = gju.rectangleCentroid({
  "type": "Polygon",
  "coordinates": [[[-122.677, 45.523], [-122.675, 45.524]]]
}),
// radius (in meters)
radius = 100;

for (var i in geometryObjectsWithinBBox) {
  if (gju.geometryWithinRadius(geometryObjectsWithinBBox[i], center, radius)) {
    // ... do stuff with objects inside the circle
  }
}

Distance between two points

Uses the Haversine distance formula to calculate the distance between two points on the Earth's curved surface (as the crow flies, no hills!). Returns the distance in meters.

gju.pointDistance({type: 'Point', coordinates:[-122.67738461494446, 45.52319466622903]},
                  {type: 'Point', coordinates:[-122.67652630805969, 45.52319466622903]})
// 66.86677669313518

and much much more!

  • "example usage with GeoCouch"
License

The MIT License

Copyright (c) 2010 Max Ogden

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Keywords

FAQs

Package last updated on 18 Mar 2014

Did you know?

Socket

Socket for GitHub automatically highlights issues in each pull request and monitors the health of all your open source dependencies. Discover the contents of your packages and block harmful activity before you install or update your dependencies.

Install

Related posts

SocketSocket SOC 2 Logo

Product

  • Package Alerts
  • Integrations
  • Docs
  • Pricing
  • FAQ
  • Roadmap
  • Changelog

Packages

npm

Stay in touch

Get open source security insights delivered straight into your inbox.


  • Terms
  • Privacy
  • Security

Made with ⚡️ by Socket Inc