Package Exports

projections

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Readme

projections

Collection of map projections. See this Wikipedia list. Reverse projections still to be implemented.

Installation

npm install --save projections

Usage

Each projection function returns an object in the form of {x: …, y: …} where 0 ≤ x ≤ 1.

const collection = require('projections') // for all projections
const miller = require('projections').miller // for a specific projection

collection.mercator({lat: …, lon: …}, {option: …}) // {x: …, y: …}
miller({lat: …, lon: …}, opt) // {x: …, y: …}

Projections

Projection	Full name	Available option(s)	Map height
`braun`	Braun stereographic projection	`latLimit`
`centralcylindrical`	Central cylindrical projection	`meridian`, `latLimit`
`equirectangular`	Equirectangular projection	`meridian`, `standardParallel`
`gall`	Gall stereographic projection	-
`gallpeters`	Gall–Peters projection	-	2 / π
`lambert`	Lambert cylindrical equal-area projection	`meridian`	1 / π
`mercator`	(Web-)Mercator projection	`meridian`, `latLimit`
`miller`	Miller cylindrical projection	`latLimit`
`sinusoidal`	Sinusoidal projection	`meridian`	1/2

Options

Option	description	Default
`meridian`	Latitude of the central meridian	0
`latLimit`	maximal latitude in degrees (<90°)	85
`standardParallel`	latitude of the standard parallel(s)	0

Contributing

If you found a bug, want to propose a feature or feel the urge to complain about your life, feel free to visit the issues page.