Method effectiveZoom

modules/core/MapSystem.js:842–850

* effectiveZoom * The "effective" zoom can be more useful for controlling the experience of the user. * This zoom is adjusted by latitude. * You can think of it as "what the zoom would be if we were editing at the equator" * For example, if we are editing in Murmansk, Russia, at about 69

()

   * @return  effective zoom
   */
  effectiveZoom() {
    const viewport = this.context.viewport;
    const lat = viewport.centerLoc()[1];
    const z = viewport.transform.zoom;
    const atLatitude = geoMetersToLon(1, lat);
    const atEquator = geoMetersToLon(1, 0);
    const extraZoom = Math.log(atLatitude / atEquator) / Math.LN2;
    return Math.min(z + extraZoom, MAX_Z);
  }


  /**