code: function forward$15(p) {
          var lon = p.x;
          var lat = p.y;
          var x, y;
          /* Forward equations
           -----------------*/
          var dlon = adjust_lon(lon - this.long0);
          if (this.sphere) {
              x = this.x0 + this.a * dlon * Math.cos(this.lat_ts);
              y = this.y0 + this.a * Math.sin(lat) / Math.cos(this.lat_ts);
          }
          else {
              var qs = qsfnz(this.e, Math.sin(lat));
              x = this.x0 + this.a * this.k0 * dlon;
              y = this.y0 + this.a * qs * 0.5 / this.k0;
          }
  
          p.x = x;
          p.y = y;
          return p;
      }
docs: /* Cylindrical Equal Area forward equations--mapping lat,long to x,y
  ------------------------------------------------------------