{"id":21366156,"url":"https://github.com/tonytonyjan/geodesics","last_synced_at":"2025-08-10T10:15:35.085Z","repository":{"id":56873942,"uuid":"186159873","full_name":"tonytonyjan/geodesics","owner":"tonytonyjan","description":"geodesics calculates the geodesic distance between 2 points with latitude and longitude on ellipsoid Earth using Lambert's formula.","archived":false,"fork":false,"pushed_at":"2019-05-11T17:14:23.000Z","size":39160,"stargazers_count":4,"open_issues_count":0,"forks_count":0,"subscribers_count":2,"default_branch":"master","last_synced_at":"2025-07-13T04:40:37.484Z","etag":null,"topics":["distance","geodesic","lambert","latitude","longitude","ruby"],"latest_commit_sha":null,"homepage":null,"language":"Ruby","has_issues":true,"has_wiki":null,"has_pages":null,"mirror_url":null,"source_name":null,"license":null,"status":null,"scm":"git","pull_requests_enabled":true,"icon_url":"https://github.com/tonytonyjan.png","metadata":{"files":{"readme":"README.md","changelog":null,"contributing":null,"funding":null,"license":null,"code_of_conduct":null,"threat_model":null,"audit":null,"citation":null,"codeowners":null,"security":null,"support":null}},"created_at":"2019-05-11T17:03:03.000Z","updated_at":"2022-08-10T03:25:44.000Z","dependencies_parsed_at":"2022-08-20T22:30:54.877Z","dependency_job_id":null,"html_url":"https://github.com/tonytonyjan/geodesics","commit_stats":null,"previous_names":[],"tags_count":1,"template":false,"template_full_name":null,"purl":"pkg:github/tonytonyjan/geodesics","repository_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/tonytonyjan%2Fgeodesics","tags_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/tonytonyjan%2Fgeodesics/tags","releases_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/tonytonyjan%2Fgeodesics/releases","manifests_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/tonytonyjan%2Fgeodesics/manifests","owner_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners/tonytonyjan","download_url":"https://codeload.github.com/tonytonyjan/geodesics/tar.gz/refs/heads/master","sbom_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/tonytonyjan%2Fgeodesics/sbom","host":{"name":"GitHub","url":"https://github.com","kind":"github","repositories_count":267404928,"owners_count":24082062,"icon_url":"https://github.com/github.png","version":null,"created_at":"2022-05-30T11:31:42.601Z","updated_at":"2022-07-04T15:15:14.044Z","status":"online","status_checked_at":"2025-07-27T02:00:11.917Z","response_time":82,"last_error":null,"robots_txt_status":"success","robots_txt_updated_at":"2025-07-24T06:49:26.215Z","robots_txt_url":"https://github.com/robots.txt","online":true,"can_crawl_api":true,"host_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub","repositories_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories","repository_names_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repository_names","owners_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners"}},"keywords":["distance","geodesic","lambert","latitude","longitude","ruby"],"created_at":"2024-11-22T07:13:58.314Z","updated_at":"2025-08-10T10:15:35.028Z","avatar_url":"https://github.com/tonytonyjan.png","language":"Ruby","funding_links":[],"categories":[],"sub_categories":[],"readme":"# geodesics\n\n[![Build Status](https://travis-ci.org/tonytonyjan/geodesics.svg?branch=master)](https://travis-ci.org/tonytonyjan/geodesics)\n\n**geodesics** calculates the geodesic distance between 2 points with latitude and longitude on ellipsoid Earth using Lambert's formula.\n\n## Features\n\n- It is extensible using [strategy pattern][strategy pattern]. By default:\n  - Use [haversine formula][haversine] for central angle calculation.\n  - Use [Lambert's formula][lambert] for\n    geodesic calculation.\n- The error rate is **less than 1%**. Passed a test set of [500,000 geodesics](test/dataset.dat) for the WGS84 ellipsoid.\n\n## Installation\n\n```\ngem install geodesics\n```\n\n## Usage\n\n### Decimal Degree as Input\n\n```rb\nrequire 'geodesics'\nlatitude1 = 22.633333\nlongitude1 = 120.266670\nlatitude2 = 25.105497\nlongitude2 = 121.597366\nGeodesics.distance(latitude1, longitude1, latitude2, longitude2)\n# =\u003e 306035.64651391446\n```\n\n- Distance unit is **meter**.\n- `Geodesics#distance` is an alias of `Geodesics#distance_degree`\n\n### Raidan as Input\n\n```rb\nGeodesics.distance_radian(latitude1, longitude1, latitude2, longitude2)\n```\n\n### Customize Strategy\n\n```rb\nclass MyStrategy\n  def distance(point1, point2)\n    # you implementation here\n  end\nend\ng = Geodesics.new(strategy: MyStrategy.new)\ng.distance(latitude1, longitude1, latitude2, longitude2)\ng.distance_radian(latitude1, longitude1, latitude2, longitude2)\n```\n\n[strategy pattern]: https://en.wikipedia.org/wiki/Strategy_pattern\n[haversine]: https://en.wikipedia.org/wiki/Versine#Haversine\n[lambert]: https://www.jstor.org/stable/24531873\n[kristianmandrup/geo-distance]: https://github.com/kristianmandrup/geo-distance\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Ftonytonyjan%2Fgeodesics","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Ftonytonyjan%2Fgeodesics","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Ftonytonyjan%2Fgeodesics/lists"}