Blue Marble Map Background#

NASA compiles some of the best photos of the Earth, which makes for very nice map backgrounds. This blog post demonstrates how to access these photos and apply them as a map background.

You can find a variety of different high-quality images from NASA here. You can even choose which month of the year you want to show.

Import necessary packages:

import matplotlib.pyplot as plt  # package for plotting
import cartopy.feature as cfeature  # package for making maps
import cartopy.crs as ccrs  # cartopy projections
import PIL  # package for imaging manipulation
import urllib  # package for working with urls

First, let’s define a function for plotting a map with a background so we can plot several different maps:

def plot_map(url, projection=ccrs.PlateCarree(), gridlines=False):
    # Load the image
    img = PIL.Image.open(urllib.request.urlopen(url))

    # Alternatively download and load the image locally
    # img = plt.imread('/local_path/blue_marble_next_generation.jpg')

    # Define the image (covers the entire Earth)
    img_extent = (-180, 180, -90, 90)
    
    ax = plt.axes(projection=projection)
    ax.set_global()
    if gridlines:
        ax.gridlines()

    ax.imshow(img, origin='upper', extent=img_extent, transform=ccrs.PlateCarree())

As a first example, let’s use a view of the Earth for October as the background for a map with the plate carrée map projection:

url_october = 'https://eoimages.gsfc.nasa.gov/images/imagerecords/74000/74167/world.200410.3x5400x2700.jpg'

plot_map(url_october, projection=ccrs.PlateCarree(), gridlines=True)

../../_images/d3ae6a228c5e5aa4194e0d3d15ae8bd8a5b034f596cd228b78ab4dad7fb05dc2.png

We could as easily have chosen another map projection, e.g., the funky lambert conformal and a photo with clouds:

url_ocean_ice_cloud = 'https://eoimages.gsfc.nasa.gov/images/imagerecords/57000/57735/land_ocean_ice_cloud_2048.jpg'

plot_map(url_ocean_ice_cloud, projection=ccrs.LambertConformal(), gridlines=True)

../../_images/0e11b80875349ced58c04cac5364d82f4b4d571eaff1e3bf26b44b6cfee7cab6.png

NASA even has this cool photo of light polution:

url_nighttime = 'https://eoimages.gsfc.nasa.gov/images/imagerecords/55000/55167/earth_lights_lrg.jpg'

plot_map(url_nighttime)

../../_images/0b219d5aaa3fba0ea25860ca87aed18da1f544293e8fa6a5fe6b0fe99087e6b1.png

Animation of two-axis tracker shading Earth as a Rubik’s cube

30 January 2023

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Blue Marble Map Background#