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plmrry/proj4toD3.js

Last active June 4, 2021 17:30
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proj4 to D3 projection
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proj4toD3.js
function radiansToDegrees(radians) {
return (radians * 180) / Math.PI;
}
function degreesToRadians(degrees) {
return degrees * (Math.PI / 180);
}
function proj4toD3(proj4String) {
const proj4 = require("proj4");
const d3 = require("d3");
const proj = proj4(proj4String);
const project = function(lambda, phi) {
return proj.forward([lambda, phi].map(radiansToDegrees));
};
project.invert = function(x, y) {
return proj.inverse([x, y]).map(degreesToRadians);
};
const projection = d3.geoProjection(project);
return projection;
};
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