tethys-feature-service/node_modules/proj4/lib/projections/laea.js

import {HALF_PI, EPSLN, FORTPI} from '../constants/values';

import qsfnz from '../common/qsfnz';
import adjust_lon from '../common/adjust_lon';

/*
  reference
    "New Equal-Area Map Projections for Noncircular Regions", John P. Snyder,
    The American Cartographer, Vol 15, No. 4, October 1988, pp. 341-355.
  */

export var S_POLE = 1;

export var N_POLE = 2;
export var EQUIT = 3;
export var OBLIQ = 4;

/* Initialize the Lambert Azimuthal Equal Area projection
  ------------------------------------------------------*/
export function init() {
  var t = Math.abs(this.lat0);
  if (Math.abs(t - HALF_PI) < EPSLN) {
    this.mode = this.lat0 < 0 ? this.S_POLE : this.N_POLE;
  }
  else if (Math.abs(t) < EPSLN) {
    this.mode = this.EQUIT;
  }
  else {
    this.mode = this.OBLIQ;
  }
  if (this.es > 0) {
    var sinphi;

    this.qp = qsfnz(this.e, 1);
    this.mmf = 0.5 / (1 - this.es);
    this.apa = authset(this.es);
    switch (this.mode) {
    case this.N_POLE:
      this.dd = 1;
      break;
    case this.S_POLE:
      this.dd = 1;
      break;
    case this.EQUIT:
      this.rq = Math.sqrt(0.5 * this.qp);
      this.dd = 1 / this.rq;
      this.xmf = 1;
      this.ymf = 0.5 * this.qp;
      break;
    case this.OBLIQ:
      this.rq = Math.sqrt(0.5 * this.qp);
      sinphi = Math.sin(this.lat0);
      this.sinb1 = qsfnz(this.e, sinphi) / this.qp;
      this.cosb1 = Math.sqrt(1 - this.sinb1 * this.sinb1);
      this.dd = Math.cos(this.lat0) / (Math.sqrt(1 - this.es * sinphi * sinphi) * this.rq * this.cosb1);
      this.ymf = (this.xmf = this.rq) / this.dd;
      this.xmf *= this.dd;
      break;
    }
  }
  else {
    if (this.mode === this.OBLIQ) {
      this.sinph0 = Math.sin(this.lat0);
      this.cosph0 = Math.cos(this.lat0);
    }
  }
}

/* Lambert Azimuthal Equal Area forward equations--mapping lat,long to x,y
  -----------------------------------------------------------------------*/
export function forward(p) {

  /* Forward equations
      -----------------*/
  var x, y, coslam, sinlam, sinphi, q, sinb, cosb, b, cosphi;
  var lam = p.x;
  var phi = p.y;

  lam = adjust_lon(lam - this.long0);
  if (this.sphere) {
    sinphi = Math.sin(phi);
    cosphi = Math.cos(phi);
    coslam = Math.cos(lam);
    if (this.mode === this.OBLIQ || this.mode === this.EQUIT) {
      y = (this.mode === this.EQUIT) ? 1 + cosphi * coslam : 1 + this.sinph0 * sinphi + this.cosph0 * cosphi * coslam;
      if (y <= EPSLN) {
        return null;
      }
      y = Math.sqrt(2 / y);
      x = y * cosphi * Math.sin(lam);
      y *= (this.mode === this.EQUIT) ? sinphi : this.cosph0 * sinphi - this.sinph0 * cosphi * coslam;
    }
    else if (this.mode === this.N_POLE || this.mode === this.S_POLE) {
      if (this.mode === this.N_POLE) {
        coslam = -coslam;
      }
      if (Math.abs(phi + this.lat0) < EPSLN) {
        return null;
      }
      y = FORTPI - phi * 0.5;
      y = 2 * ((this.mode === this.S_POLE) ? Math.cos(y) : Math.sin(y));
      x = y * Math.sin(lam);
      y *= coslam;
    }
  }
  else {
    sinb = 0;
    cosb = 0;
    b = 0;
    coslam = Math.cos(lam);
    sinlam = Math.sin(lam);
    sinphi = Math.sin(phi);
    q = qsfnz(this.e, sinphi);
    if (this.mode === this.OBLIQ || this.mode === this.EQUIT) {
      sinb = q / this.qp;
      cosb = Math.sqrt(1 - sinb * sinb);
    }
    switch (this.mode) {
    case this.OBLIQ:
      b = 1 + this.sinb1 * sinb + this.cosb1 * cosb * coslam;
      break;
    case this.EQUIT:
      b = 1 + cosb * coslam;
      break;
    case this.N_POLE:
      b = HALF_PI + phi;
      q = this.qp - q;
      break;
    case this.S_POLE:
      b = phi - HALF_PI;
      q = this.qp + q;
      break;
    }
    if (Math.abs(b) < EPSLN) {
      return null;
    }
    switch (this.mode) {
    case this.OBLIQ:
    case this.EQUIT:
      b = Math.sqrt(2 / b);
      if (this.mode === this.OBLIQ) {
        y = this.ymf * b * (this.cosb1 * sinb - this.sinb1 * cosb * coslam);
      }
      else {
        y = (b = Math.sqrt(2 / (1 + cosb * coslam))) * sinb * this.ymf;
      }
      x = this.xmf * b * cosb * sinlam;
      break;
    case this.N_POLE:
    case this.S_POLE:
      if (q >= 0) {
        x = (b = Math.sqrt(q)) * sinlam;
        y = coslam * ((this.mode === this.S_POLE) ? b : -b);
      }
      else {
        x = y = 0;
      }
      break;
    }
  }

  p.x = this.a * x + this.x0;
  p.y = this.a * y + this.y0;
  return p;
}

/* Inverse equations
  -----------------*/
export function inverse(p) {
  p.x -= this.x0;
  p.y -= this.y0;
  var x = p.x / this.a;
  var y = p.y / this.a;
  var lam, phi, cCe, sCe, q, rho, ab;
  if (this.sphere) {
    var cosz = 0,
      rh, sinz = 0;

    rh = Math.sqrt(x * x + y * y);
    phi = rh * 0.5;
    if (phi > 1) {
      return null;
    }
    phi = 2 * Math.asin(phi);
    if (this.mode === this.OBLIQ || this.mode === this.EQUIT) {
      sinz = Math.sin(phi);
      cosz = Math.cos(phi);
    }
    switch (this.mode) {
    case this.EQUIT:
      phi = (Math.abs(rh) <= EPSLN) ? 0 : Math.asin(y * sinz / rh);
      x *= sinz;
      y = cosz * rh;
      break;
    case this.OBLIQ:
      phi = (Math.abs(rh) <= EPSLN) ? this.lat0 : Math.asin(cosz * this.sinph0 + y * sinz * this.cosph0 / rh);
      x *= sinz * this.cosph0;
      y = (cosz - Math.sin(phi) * this.sinph0) * rh;
      break;
    case this.N_POLE:
      y = -y;
      phi = HALF_PI - phi;
      break;
    case this.S_POLE:
      phi -= HALF_PI;
      break;
    }
    lam = (y === 0 && (this.mode === this.EQUIT || this.mode === this.OBLIQ)) ? 0 : Math.atan2(x, y);
  }
  else {
    ab = 0;
    if (this.mode === this.OBLIQ || this.mode === this.EQUIT) {
      x /= this.dd;
      y *= this.dd;
      rho = Math.sqrt(x * x + y * y);
      if (rho < EPSLN) {
        p.x = this.long0;
        p.y = this.lat0;
        return p;
      }
      sCe = 2 * Math.asin(0.5 * rho / this.rq);
      cCe = Math.cos(sCe);
      x *= (sCe = Math.sin(sCe));
      if (this.mode === this.OBLIQ) {
        ab = cCe * this.sinb1 + y * sCe * this.cosb1 / rho;
        q = this.qp * ab;
        y = rho * this.cosb1 * cCe - y * this.sinb1 * sCe;
      }
      else {
        ab = y * sCe / rho;
        q = this.qp * ab;
        y = rho * cCe;
      }
    }
    else if (this.mode === this.N_POLE || this.mode === this.S_POLE) {
      if (this.mode === this.N_POLE) {
        y = -y;
      }
      q = (x * x + y * y);
      if (!q) {
        p.x = this.long0;
        p.y = this.lat0;
        return p;
      }
      ab = 1 - q / this.qp;
      if (this.mode === this.S_POLE) {
        ab = -ab;
      }
    }
    lam = Math.atan2(x, y);
    phi = authlat(Math.asin(ab), this.apa);
  }

  p.x = adjust_lon(this.long0 + lam);
  p.y = phi;
  return p;
}

/* determine latitude from authalic latitude */
var P00 = 0.33333333333333333333;

var P01 = 0.17222222222222222222;
var P02 = 0.10257936507936507936;
var P10 = 0.06388888888888888888;
var P11 = 0.06640211640211640211;
var P20 = 0.01641501294219154443;

function authset(es) {
  var t;
  var APA = [];
  APA[0] = es * P00;
  t = es * es;
  APA[0] += t * P01;
  APA[1] = t * P10;
  t *= es;
  APA[0] += t * P02;
  APA[1] += t * P11;
  APA[2] = t * P20;
  return APA;
}

function authlat(beta, APA) {
  var t = beta + beta;
  return (beta + APA[0] * Math.sin(t) + APA[1] * Math.sin(t + t) + APA[2] * Math.sin(t + t + t));
}

export var names = ["Lambert Azimuthal Equal Area", "Lambert_Azimuthal_Equal_Area", "laea"];
export default {
  init: init,
  forward: forward,
  inverse: inverse,
  names: names,
  S_POLE: S_POLE,
  N_POLE: N_POLE,
  EQUIT: EQUIT,
  OBLIQ: OBLIQ
};