Huge Google Maps
Program to make huge, detailed screenshots of Google Maps.
Developed as a one-off script to make a 4-foot square wall map of Philadelphia (25000 x 25000 pixels). Will require minor tweaking to work on other machines or zoom levels.
Please be respectful of the Google Maps Terms of Service, remember to attribute properly, and do not use this program for commercial purposes.
Requirements / Dependencies
- Python 3.5
- Selenium 3.0.2 (Browser automation to display the Google maps)
- PyScreenshot 0.4.2 (To capture an area of each map)
- Nose 1.3.7 (To run and time tests / map creation)
- Mozilla Gecko driver --
mv geckodriver /usr/bin
- Set computer screen to not turn off / sleep while program is running
sudo python3 -m pip install selenium sudo python3 -m pip install pyscreenshot sudo python3 -m pip install nose sudo apt-get install python3-tk
Using the program
hugegmaps script and call the
You can reference the
tests.py file for examples of the below content.
outfile parameter is passed to the function,
then the finished map will be saved to that location.
Otherwise, the file will be saved to the current working
directory with the filename
Start by going to Google Maps, and find the top-left
coordinate you want to use for the final map. At the moment,
the program always runs at a zoom level of
18z. I anchored
my test runs around the Philly Art Museum, so my coordinates
Run a quick test of the program to create an image from a single screenshot.
from hugegmaps import create_map create_map( lat_start=39.9644273, long_start=-75.1801129, number_rows=1, number_cols=1, outfile='test_calibration.png', )
Open the program in an image viewer of your choice. Using the Ubuntu default viewer:
Based on the results of the program run with
0 for all
make an estimate for what ratio should be trimmed from each side so that only
the pure map area is seen. On my laptop, a single display with left-side
taskbar, these values were:
offset_left=0, # My value: 0.05 offset_top=0, # My value: 0.17 offset_right=0, # My value: 0.03 offset_bottom=0, # My value: 0.09
Once you adjust the offsets to eliminate unwanted elements, delete the test screenshot, and run the program again. This will take a few runs with trial-and-error to get right.
When you're happy with the single screenshot and have the offsets configured,
run the program on a small 3x3 grid to ensure that the images get stitched
together seamlessly. You'll want to run the program at a scale of about
0.2, or else the resulting image can be too large to open in normal
At this point, you also want to increase the
sleep_time to make sure that
all asynchronous image loading functions complete before you take your
screenshot. If this is set too low, some screenshots may appear with less
content and lower resolution than others in the final image.
create_map( lat_start=39.9644273, long_start=-75.1801129, number_rows=3, number_cols=3, scale=0.2, sleep_time=3, offset_left=0.05, offset_top=0.17, offset_right=0.03, offset_bottom=0.09, outfile='huge_gmap_small_area.png', )
Look at the resulting image to ensure the offsets are correct, and make sure
the seams of the screenshots (at 1/3 and 2/3 of the final image's height
and width) line up. If these do not line up perfectly, you might need to make
small adjustments to the 'magic numbers' in the
Once you are happy with the test of a 3x3 grid of images, estimate the total number of rows and columns that your desired area will require, and run the program at low resolution and no sleep time to confirm those numbers.
After you confirm your offsets and rows/columns at low resolution, run
the program with a
sleep_time=3 (or more) to create your
print-ready huge Google Map.
If you have any suggestions for improvement, please update this code in the simplest way that could possibly work, and submit a pull request. Or, just open an Issue on GitHub.
Wishlist / TODO
pyscreenshotdependency by hand-rolling a
crop_image_by_offsetsfunction using PIL. Selenium can take full-screen screenshots already.
- Allow for adjustable zoom levels. Will require adjusting the formula and magic numbers for the lat and long shift calculations.
- Allow the program to work with Google Earth, not just Google Maps.