def zoom_search(lat, lon):
""" search the nearest city by lat and lon """
# generate search areas, nine blocks search
grid_lat = round_prec(lat)
lats = [grid_lat - grid_size, grid_lat, grid_lat + grid_size]
grid_lon = round_prec(lon)
lons = [grid_lon - grid_size, grid_lon, grid_lon + grid_size]
keys = itertools.product(lats, lons)
# find the most suitable key
results = []
for key in keys:
klat, klon = key
city_key = "{0},{1}".format(klat, klon)
try:
city_list = city_grids[city_key]
except KeyError:
continue
for city in city_list:
name, clat, clon = city
gcd_error_distance = gcd_dist.calc_dist_degree(clat, clon, lat, lon)
results.append((name, gcd_error_distance))
if len(results) > 0:
sorted_results = sorted(results, key = lambda k:k[1])
return sorted_results[0]
else:
return (None, None)
def zoom_search(lat, lon):
""" search the nearest city by lat and lon """
# generate search areas, nine blocks search
grid_lat = round_prec(lat)
lats = [grid_lat - grid_size, grid_lat, grid_lat + grid_size]
grid_lon = round_prec(lon)
lons = [grid_lon - grid_size, grid_lon, grid_lon + grid_size]
keys = itertools.product(lats, lons)
# find the most suitable key
results = []
for key in keys:
klat, klon = key
city_key = "{0},{1}".format(klat, klon)
try:
city_list = city_grids[city_key]
except KeyError:
continue
for city in city_list:
name, clat, clon = city
gcd_error_distance = gcd_dist.calc_dist_degree(clat, clon, lat, lon)
results.append((name, gcd_error_distance))
if len(results) > 0:
sorted_results = sorted(results, key = lambda k:k[1])
return sorted_results[0]
else:
return (None, None)
results.append((name, gcd_error_distance))
if len(results) > 0:
sorted_results = sorted(results, key = lambda k:k[1])
return sorted_results[0]
else:
return (None, None)
def lookup_city(lat, lon):
city, offset_distance = zoom_search(lat, lon)
if city:
return city
else:
return None
def lookup_coords(city):
if city in city_info:
lat, lon = city_info[city][:2]
return lat, lon
else:
return None
city_info = load_city_info()
city_grids = build_city_grids(city_info)
if __name__ == "__main__":
print zoom_search(44.86503177,-85.51900375)
print zoom_search(54.64403, -2.69027)
print zoom_search(53.76667, -2.71667)
print gcd_dist.calc_dist_degree(54.64403, -2.69027, 53.76667, -2.71667)
print zoom_search(4.77742, 7.0134)
results.append((name, gcd_error_distance))
if len(results) > 0:
sorted_results = sorted(results, key = lambda k:k[1])
return sorted_results[0]
else:
return (None, None)
def lookup_city(lat, lon):
city, offset_distance = zoom_search(lat, lon)
if city:
return city
else:
return None
def lookup_coords(city):
if city in city_info:
lat, lon = city_info[city][:2]
return lat, lon
else:
return None
city_info = load_city_info()
city_grids = build_city_grids(city_info)
if __name__ == "__main__":
print zoom_search(44.86503177,-85.51900375)
print zoom_search(54.64403, -2.69027)
print zoom_search(53.76667, -2.71667)
print gcd_dist.calc_dist_degree(54.64403, -2.69027, 53.76667, -2.71667)
print zoom_search(4.77742, 7.0134)