Plotting Points on a Global Map with Basemap

This function creates a map using the Basemap library and plots points on the map with given longitude and latitude values, each point having a specified color.

Technology Stack : Basemap, NumPy, Matplotlib

Code Type : Function

Code Difficulty : Intermediate

                
                    
import numpy as np
import matplotlib.pyplot as plt
from mpl_toolkits.basemap import Basemap

def plot_map_with_lons_lats(lons, lats, colors):
    """
    This function creates a map using Basemap and plots points on the map with given longitude and latitude values.
    """
    # Create a figure and an axis
    fig, ax = plt.subplots()

    # Create a Basemap instance
    m = Basemap(projection='merc', llcrnrlat=-60, urcrnrlat=90, llcrnrlon=-180, urcrnrlon=180, lat_ts=20, resolution='c')

    # Draw coastlines, countries, and meridians and parallels on the map
    m.drawcoastlines()
    m.drawcountries()
    m.drawmeridians(np.arange(-180, 181, 30), labels=[0, 0, 0, 0])
    m.drawparallels(np.arange(-90, 91, 30), labels=[0, 0, 0, 0])

    # Scatter plot of longitude and latitude points with specified colors
    x, y = m(lons, lats)
    sc = m.scatter(x, y, c=colors, marker='o')

    # Add a colorbar
    cbar = plt.colorbar(sc)
    cbar.set_label('Color Intensity')

    # Show the plot
    plt.show()

# Example usage:
lons = np.random.uniform(-180, 180, 100)
lats = np.random.uniform(-90, 90, 100)
colors = np.random.randint(0, 256, 100)

plot_map_with_lons_lats(lons, lats, colors)