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Carga
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/* *
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*
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* Equal Earth projection, an equal-area projection designed to minimize
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* distortion and remain pleasing to the eye.
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*
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* Invented by Bojan Šavrič, Bernhard Jenny, and Tom Patterson in 2018. It is
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* inspired by the widely used Robinson projection.
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*
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* */
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'use strict';
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var A1 = 1.340264, A2 = -0.081106, A3 = 0.000893, A4 = 0.003796, M = Math.sqrt(3) / 2.0, scale = 74.03120656864502;
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var EqualEarth = /** @class */ (function () {
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function EqualEarth() {
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this.bounds = {
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x1: -200.37508342789243,
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x2: 200.37508342789243,
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y1: -97.52595454902263,
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y2: 97.52595454902263
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};
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}
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EqualEarth.prototype.forward = function (lonLat) {
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var d = Math.PI / 180, paramLat = Math.asin(M * Math.sin(lonLat[1] * d)), paramLatSq = paramLat * paramLat, paramLatPow6 = paramLatSq * paramLatSq * paramLatSq;
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var x = lonLat[0] * d * Math.cos(paramLat) * scale / (M *
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(A1 +
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3 * A2 * paramLatSq +
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paramLatPow6 * (7 * A3 + 9 * A4 * paramLatSq)));
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var y = paramLat * scale * (A1 + A2 * paramLatSq + paramLatPow6 * (A3 + A4 * paramLatSq));
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return [x, y];
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};
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EqualEarth.prototype.inverse = function (xy) {
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var x = xy[0] / scale, y = xy[1] / scale, d = 180 / Math.PI, epsilon = 1e-9, iterations = 12;
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var paramLat = y, paramLatSq, paramLatPow6, fy, fpy, dlat, i;
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for (i = 0; i < iterations; ++i) {
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paramLatSq = paramLat * paramLat;
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paramLatPow6 = paramLatSq * paramLatSq * paramLatSq;
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fy = paramLat * (A1 + A2 * paramLatSq + paramLatPow6 * (A3 + A4 * paramLatSq)) - y;
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fpy = A1 + 3 * A2 * paramLatSq + paramLatPow6 * (7 * A3 + 9 * A4 * paramLatSq);
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paramLat -= dlat = fy / fpy;
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if (Math.abs(dlat) < epsilon) {
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break;
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}
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}
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paramLatSq = paramLat * paramLat;
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paramLatPow6 = paramLatSq * paramLatSq * paramLatSq;
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var lon = d * M * x * (A1 + 3 * A2 * paramLatSq + paramLatPow6 * (7 * A3 + 9 * A4 * paramLatSq)) / Math.cos(paramLat);
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var lat = d * Math.asin(Math.sin(paramLat) / M);
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return [lon, lat];
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};
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return EqualEarth;
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}());
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export default EqualEarth;
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@@ -0,0 +1,60 @@
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/* *
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* Lambert Conformal Conic projection
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* */
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'use strict';
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var sign = Math.sign ||
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(function (n) { return (n === 0 ? 0 : n > 0 ? 1 : -1); }), scale = 63.78137, deg2rad = Math.PI / 180, halfPI = Math.PI / 2, eps10 = 1e-6, tany = function (y) { return Math.tan((halfPI + y) / 2); };
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var LambertConformalConic = /** @class */ (function () {
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function LambertConformalConic(options) {
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var _a;
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var parallels = (options.parallels || [])
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.map(function (n) { return n * deg2rad; }), lat1 = parallels[0] || 0, lat2 = (_a = parallels[1]) !== null && _a !== void 0 ? _a : lat1, cosLat1 = Math.cos(lat1);
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if (typeof options.projectedBounds === 'object') {
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this.projectedBounds = options.projectedBounds;
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}
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// Apply the global variables
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var n = lat1 === lat2 ?
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Math.sin(lat1) :
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Math.log(cosLat1 / Math.cos(lat2)) / Math.log(tany(lat2) / tany(lat1));
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if (Math.abs(n) < 1e-10) {
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n = (sign(n) || 1) * 1e-10;
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}
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this.n = n;
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this.c = cosLat1 * Math.pow(tany(lat1), n) / n;
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}
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LambertConformalConic.prototype.forward = function (lonLat) {
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var lon = lonLat[0] * deg2rad, _a = this, c = _a.c, n = _a.n, projectedBounds = _a.projectedBounds;
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var lat = lonLat[1] * deg2rad;
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if (c > 0) {
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if (lat < -halfPI + eps10) {
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lat = -halfPI + eps10;
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}
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}
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else {
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if (lat > halfPI - eps10) {
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lat = halfPI - eps10;
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}
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}
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var r = c / Math.pow(tany(lat), n), x = r * Math.sin(n * lon) * scale, y = (c - r * Math.cos(n * lon)) * scale, xy = [x, y];
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if (projectedBounds && (x < projectedBounds.x1 ||
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x > projectedBounds.x2 ||
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y < projectedBounds.y1 ||
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y > projectedBounds.y2)) {
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xy.outside = true;
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}
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return xy;
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};
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LambertConformalConic.prototype.inverse = function (xy) {
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var x = xy[0] / scale, y = xy[1] / scale, _a = this, c = _a.c, n = _a.n, cy = c - y, rho = sign(n) * Math.sqrt(x * x + cy * cy);
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var l = Math.atan2(x, Math.abs(cy)) * sign(cy);
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if (cy * n < 0) {
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l -= Math.PI * sign(x) * sign(cy);
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}
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return [
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(l / n) / deg2rad,
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(2 * Math.atan(Math.pow(c / rho, 1 / n)) - halfPI) / deg2rad
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];
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};
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return LambertConformalConic;
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}());
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export default LambertConformalConic;
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/* *
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* Miller projection
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* */
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'use strict';
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var quarterPI = Math.PI / 4, deg2rad = Math.PI / 180, scale = 63.78137;
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var Miller = /** @class */ (function () {
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function Miller() {
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this.bounds = {
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x1: -200.37508342789243,
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x2: 200.37508342789243,
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y1: -146.91480769173063,
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y2: 146.91480769173063
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};
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}
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Miller.prototype.forward = function (lonLat) {
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return [
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lonLat[0] * deg2rad * scale,
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1.25 * scale * Math.log(Math.tan(quarterPI + 0.4 * lonLat[1] * deg2rad))
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];
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};
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Miller.prototype.inverse = function (xy) {
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return [
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(xy[0] / scale) / deg2rad,
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2.5 * (Math.atan(Math.exp(0.8 * (xy[1] / scale))) - quarterPI) / deg2rad
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];
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};
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return Miller;
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}());
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export default Miller;
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/* *
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* Orthographic projection
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* */
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'use strict';
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var deg2rad = Math.PI / 180, scale = 63.78460826781007;
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var Orthographic = /** @class */ (function () {
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function Orthographic() {
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this.antimeridianCutting = false;
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this.bounds = {
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x1: -scale,
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x2: scale,
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y1: -scale,
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y2: scale
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};
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}
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Orthographic.prototype.forward = function (lonLat) {
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var lonDeg = lonLat[0], latDeg = lonLat[1];
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var lat = latDeg * deg2rad;
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var xy = [
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Math.cos(lat) * Math.sin(lonDeg * deg2rad) * scale,
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Math.sin(lat) * scale
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];
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if (lonDeg < -90 || lonDeg > 90) {
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xy.outside = true;
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}
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return xy;
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};
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Orthographic.prototype.inverse = function (xy) {
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var x = xy[0] / scale, y = xy[1] / scale, z = Math.sqrt(x * x + y * y), c = Math.asin(z), cSin = Math.sin(c), cCos = Math.cos(c);
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return [
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Math.atan2(x * cSin, z * cCos) / deg2rad,
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Math.asin(z && y * cSin / z) / deg2rad
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];
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};
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return Orthographic;
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}());
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export default Orthographic;
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@@ -0,0 +1,19 @@
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/* *
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*
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* !!!!!!! SOURCE GETS TRANSPILED BY TYPESCRIPT. EDIT TS FILE ONLY. !!!!!!!
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*
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* */
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'use strict';
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import LambertConformalConic from './LambertConformalConic.js';
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import EqualEarth from './EqualEarth.js';
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import Miller from './Miller.js';
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import Orthographic from './Orthographic.js';
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import WebMercator from './WebMercator.js';
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var registry = {
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EqualEarth: EqualEarth,
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LambertConformalConic: LambertConformalConic,
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Miller: Miller,
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Orthographic: Orthographic,
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WebMercator: WebMercator
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};
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export default registry;
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@@ -0,0 +1,36 @@
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/* *
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* Web Mercator projection, used for most online map tile services
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* */
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'use strict';
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var maxLatitude = 85.0511287798, // The latitude that defines a square
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r = 63.78137, deg2rad = Math.PI / 180;
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var WebMercator = /** @class */ (function () {
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function WebMercator() {
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this.bounds = {
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x1: -200.37508342789243,
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x2: 200.37508342789243,
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y1: -200.3750834278071,
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y2: 200.3750834278071
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};
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this.maxLatitude = maxLatitude;
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}
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WebMercator.prototype.forward = function (lonLat) {
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var sinLat = Math.sin(lonLat[1] * deg2rad);
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var xy = [
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r * lonLat[0] * deg2rad,
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r * Math.log((1 + sinLat) / (1 - sinLat)) / 2
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];
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if (Math.abs(lonLat[1]) > maxLatitude) {
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xy.outside = true;
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}
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return xy;
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};
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WebMercator.prototype.inverse = function (xy) {
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return [
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xy[0] / (r * deg2rad),
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(2 * Math.atan(Math.exp(xy[1] / r)) - (Math.PI / 2)) / deg2rad
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];
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};
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return WebMercator;
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}());
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export default WebMercator;
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