code: import matplotlib.pyplot as plt
  import numpy as np
  
  
  grid2D = np.load(r"C:\temp\10km_grids\20180808-23.npy")
  
  fig, ax = plt.subplots(figsize=(16.2, 16))
  im = ax.imshow(grid2D)
  ax.set_xlabel("Cols")
  ax.set_ylabel("Rows")
  plt.colorbar(im)
  
  plt.savefig('grid2D.png')
  
apis: numpy.load matplotlib.pyplot.colorbar matplotlib.pyplot.subplots matplotlib.pyplot.savefig