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Content #!/usr/bin/python # GoogleMapDownloader.py # Created by Hayden Eskriett [http://eskriett.com] # # A script which when given a longitude, latitude and zoom level downloads a # high resolution google map # Find the associated blog post at: http://blog.eskriett.com/2013/07/19/downloading-google-maps/ import urllib import Image import os import math class GoogleMapDownloader: """ A class which generates high resolution google maps images given a longitude, latitude and zoom level """ def __init__(self, lat, lng, zoom=12): """ GoogleMapDownloader Constructor Args: lat: The latitude of the location required lng: The longitude of the location required zoom: The zoom level of the location required, ranges from 0 - 23 defaults to 12 """ self._lat = lat self._lng = lng self._zoom = zoom def getXY(self): """ Generates an X,Y tile coordinate based on the latitude, longitude and zoom level Returns: An X,Y tile coordinate """ tile_size = 256 # Use a left shift to get the power of 2 # i.e. a zoom level of 2 will have 2^2 = 4 tiles numTiles = 1 << self._zoom # Find the x_point given the longitude point_x = (tile_size / 2 + self._lng * tile_size / 360.0) * numTiles // tile_size # Convert the latitude to radians and take the sine sin_y = math.sin(self._lat * (math.pi / 180.0)) # Calulate the y coorindate point_y = ((tile_size / 2) + 0.5 * math.log((1 + sin_y) / (1 - sin_y)) * -( tile_size / (2 * math.pi))) * numTiles // tile_size return int(point_x), int(point_y) def generateImage(self, **kwargs): """ Generates an image by stitching a number of google map tiles together. Args: start_x: The top-left x-tile coordinate start_y: The top-left y-tile coordinate tile_width: The number of tiles wide the image should be - defaults to 5 tile_height: The number of tiles high the image should be - defaults to 5 Returns: A high-resolution Goole Map image. """ start_x = kwargs.get('start_x', None) start_y = kwargs.get('start_y', None) tile_width = kwargs.get('tile_width', 5) tile_height = kwargs.get('tile_height', 5) # Check that we have x and y tile coordinates if start_x == None or start_y == None: start_x, start_y = self.getXY() # Determine the size of the image width, height = 256 * tile_width, 256 * tile_height # Create a new image of the size require map_img = Image.new('RGB', (width, height)) for x in range(0, tile_width): for y in range(0, tile_height): url = 'https://mt0.google.com/vt?x=' + str(start_x + x) + '&y=' + str(start_y + y) + '&z=' + str( self._zoom) current_tile = str(x) + '-' + str(y) urllib.urlretrieve(url, current_tile) im = Image.open(current_tile) map_img.paste(im, (x * 256, y * 256)) os.remove(current_tile) return map_img def main(): # Create a new instance of GoogleMap Downloader gmd = GoogleMapDownloader(51.5171, 0.1062, 13) print("The tile coorindates are {}".format(gmd.getXY())) try: # Get the high resolution image img = gmd.generateImage() except IOError: print("Could not generate the image - try adjusting the zoom level and checking your coordinates") else: # Save the image to disk img.save("high_resolution_image.png") print("The map has successfully been created") if __name__ == '__main__': main()