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proj4

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Proj4js is a JavaScript library to transform point coordinates from one coordinate system to another, including datum transformations.

proj4js.github.io/proj4js/

proj4js/proj4js

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export default { mm: { to_meter: 0.001 }, cm: { to_meter: 0.01 }, ft: { to_meter: 0.3048 }, 'us-ft': { to_meter: 1200 / 3937 }, fath: { to_meter: 1.8288 }, kmi: { to_meter: 1852 }, 'us-ch': { to_meter: 20.1168402336805 }, 'us-mi': { to_meter: 1609.34721869444 }, km: { to_meter: 1000 }, 'ind-ft': { to_meter: 0.30479841 }, 'ind-yd': { to_meter: 0.91439523 }, mi: { to_meter: 1609.344 }, yd: { to_meter: 0.9144 }, ch: { to_meter: 20.1168 }, link: { to_meter: 0.201168 }, dm: { to_meter: 0.1 }, in: { to_meter: 0.0254 }, 'ind-ch': { to_meter: 20.11669506 }, 'us-in': { to_meter: 0.025400050800101 }, 'us-yd': { to_meter: 0.914401828803658 } };