def calc_locator_scale(city_slug): return extent_scale(city_extent_in_map_srs(city_slug), size=LOCATOR_SIZE, units=settings.MAP_UNITS)
def get_locator_scale(city_slug, size=(75,75)): bbox = transform_extent(get_metro(city_slug)['extent'], settings.SPATIAL_REF_SYS) return extent_scale(bbox, size, settings.MAP_UNITS)