metersPerPixels static method

double metersPerPixels(double latitude, double zoom)

ref.

• https://wiki.openstreetmap.org/wiki/Zoom_levels
• https://docs.microsoft.com/en-us/bingmaps/articles/bing-maps-tile-system
• https://docs.microsoft.com/en-us/bingmaps/articles/understanding-scale-and-resolution
• https://blog.mapbox.com/512-map-tiles-cb5bfd6e72ba

Implementation

static double metersPerPixels(double latitude, double zoom) {
  return math.cos(latitude * _degToRad) * _earthC / math.pow(2, zoom + 9.0);
}