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How to insert a scale bar in a map in Matplotlib?
To insert a scale bar in a map in matplotlib, we can use AnchoredBar() class to instantiate the scalebar object.
Steps
Set the figure size and adjust the padding between and around the subplots.
Create random data using numpy.
Use imshow() method to display data as an image, i.e., on a 2D regular raster.
Get the current axis using gca() method.
Draw a horizontal scale bar with a center-aligned label underneath.
Add a scalebar artist to the current axis.
Turn off the axes.
To display the figure, use show() mthod.
Example
from matplotlib import pyplot as plt
from mpl_toolkits.axes_grid1.anchored_artists import AnchoredSizeBar
import numpy as np
plt.rcParams["figure.figsize"] = [7.50, 3.50]
plt.rcParams["figure.autolayout"] = True
data = np.random.rand(5, 5)
img = plt.imshow(data, cmap="YlGnBu")
ax = plt.gca()
scalebar = AnchoredSizeBar(ax.transData, 1, "1 Meter", 9)
ax.add_artist(scalebar)
ax.axis('off')
plt.show()Output
Updated on: 03-Jun-2021
1K+ Views
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