plot_map_to_png.py

from mpl_toolkits.basemap import Basemap
import matplotlib.pyplot as plt
# create new figure, axes instances.

# we specify specific sizes for the figure to make it bigger
# DPI is "Dots per inch" -- it's used in the printing world
# The reason we specify the DPI instead of raw pixels is because
# we want the text to be consistently scaled.
my_dpi = 75 
fig = plt.figure(figsize=(3600/my_dpi, 1800/my_dpi), dpi=my_dpi)


m = Basemap()
m.drawcoastlines()

# Load data from the JSON file and fill these in:
latitudes = [0, -10, 40, -20]
longitudes = [0, -10, 40, -20]

# add scatter points to the graph:
m.scatter(longitudes, latitudes, latlon=True, marker='D',color='m')


plt.savefig('map.png')