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Viewing file:     projection.js (3.9 KB)      -rwxrwxr-x

/**
 * ------------------------------------------------------------------------
 * Object
 * ------------------------------------------------------------------------
 */
const Proj = {

  /* sgn(n){
    if (n > 0) {
      return 1;
    } else if (n < 0) {
      return -1;
    } else {
      return n;
    }
  }, */

  mill(lat, lng, c) {
    return {
      x: this.radius * (lng - c) * this.radDeg,
      y: - this.radius * Math.log(Math.tan((45 + 0.4 * lat) * this.radDeg)) / 0.8
    };
  },

  /* mill_inv(x, y, c) {
    return {
      lat: (2.5 * Math.atan(Math.exp(0.8 * y / this.radius)) - 5 * Math.PI / 8) * this.degRad,
      lng: (c * this.radDeg + x / this.radius) * this.degRad
    };
  }, */

  merc(lat, lng, c) {
    return {
      x: this.radius * (lng - c) * this.radDeg,
      y: - this.radius * Math.log(Math.tan(Math.PI / 4 + lat * Math.PI / 360))
    };
  },

  /* merc_inv(x, y, c) {
    return {
      lat: (2 * Math.atan(Math.exp(y / this.radius)) - Math.PI / 2) * this.degRad,
      lng: (c * this.radDeg + x / this.radius) * this.degRad
    };
  }, */

  aea(lat, lng, c) {
    var fi0 = 0,
        lambda0 = c * this.radDeg,
        fi1 = 29.5 * this.radDeg,
        fi2 = 45.5 * this.radDeg,
        fi = lat * this.radDeg,
        lambda = lng * this.radDeg,
        n = (Math.sin(fi1)+Math.sin(fi2)) / 2,
        C = Math.cos(fi1)*Math.cos(fi1)+2*n*Math.sin(fi1),
        theta = n*(lambda-lambda0),
        ro = Math.sqrt(C-2*n*Math.sin(fi))/n,
        ro0 = Math.sqrt(C-2*n*Math.sin(fi0))/n;

    return {
      x: ro * Math.sin(theta) * this.radius,
      y: - (ro0 - ro * Math.cos(theta)) * this.radius
    };
  },

  /* aea_inv(xCoord, yCoord, c) {
    var x = xCoord / this.radius,
        y = yCoord / this.radius,
        fi0 = 0,
        lambda0 = c * this.radDeg,
        fi1 = 29.5 * this.radDeg,
        fi2 = 45.5 * this.radDeg,
        n = (Math.sin(fi1)+Math.sin(fi2)) / 2,
        C = Math.cos(fi1)*Math.cos(fi1)+2*n*Math.sin(fi1),
        ro0 = Math.sqrt(C-2*n*Math.sin(fi0))/n,
        ro = Math.sqrt(x*x+(ro0-y)*(ro0-y)),
        theta = Math.atan( x / (ro0 - y) );

    return {
      lat: (Math.asin((C - ro * ro * n * n) / (2 * n))) * this.degRad,
      lng: (lambda0 + theta / n) * this.degRad
    };
  }, */

  lcc(lat, lng, c) {
    var fi0 = 0,
        lambda0 = c * this.radDeg,
        lambda = lng * this.radDeg,
        fi1 = 33 * this.radDeg,
        fi2 = 45 * this.radDeg,
        fi = lat * this.radDeg,
        n = Math.log(Math.cos(fi1) * (1 / Math.cos(fi2)) ) / Math.log(Math.tan(Math.PI / 4 + fi2 / 2) * (1 / Math.tan(Math.PI / 4 + fi1 / 2) )),
        F = (Math.cos(fi1) * Math.pow(Math.tan(Math.PI / 4 + fi1 / 2 ), n )) / n,
        ro = F * Math.pow(1 / Math.tan(Math.PI / 4 + fi / 2), n),
        ro0 = F * Math.pow(1 / Math.tan(Math.PI / 4 + fi0 / 2), n);

    return {
      x: ro * Math.sin(n * (lambda - lambda0)) * this.radius,
      y: - (ro0 - ro * Math.cos(n * (lambda - lambda0))) * this.radius
    };
  },

  /* lcc_inv(xCoord, yCoord, c) {
    var x = xCoord / this.radius,
        y = yCoord / this.radius,
        fi0 = 0,
        lambda0 = c * this.radDeg,
        fi1 = 33 * this.radDeg,
        fi2 = 45 * this.radDeg,
        n = Math.log( Math.cos(fi1) * (1 / Math.cos(fi2)) ) / Math.log( Math.tan( Math.PI / 4 + fi2 / 2) * (1 / Math.tan( Math.PI / 4 + fi1 / 2) ) ),
        F = ( Math.cos(fi1) * Math.pow( Math.tan( Math.PI / 4 + fi1 / 2 ), n ) ) / n,
        ro0 = F * Math.pow( 1 / Math.tan( Math.PI / 4 + fi0 / 2 ), n ),
        ro = this.sgn(n) * Math.sqrt(x*x+(ro0-y)*(ro0-y)),
        theta = Math.atan( x / (ro0 - y) );

    return {
      lat: (2 * Math.atan(Math.pow(F/ro, 1/n)) - Math.PI / 2) * this.degRad,
      lng: (lambda0 + theta / n) * this.degRad
    };
  } */
}

Proj.degRad = 180 / Math.PI
Proj.radDeg = Math.PI / 180
Proj.radius = 6381372

export default Proj