Plot a line over a 2D histogram python

Question

I'm trying to, for simplicity's sake, plot a line over a 2D histogram, with both the line and the histogram points referring to latitude/longitude coordinates.

Here's an example of the sort of thing I'm trying to do:

import numpy as np
import matplotlib.pyplot as plt
img = np.random.rand(10,10)
longs = [100,101]
lats = [45,46]
x = np.linspace(100,100)
y = np.linspace(45,46)

plt.figure()
plt.imshow(img,extent=[longs[0],longs[1],lats[0],lats[1]])
plt.plot(x,y)
plt.show()

DavidG · Accepted Answer · 2018-09-27 09:11:51Z

1

Your approach is correct, however you cannot see the line for 2 reasons.

1) Your x axis limits are 100 and 101, and you are trying to plot the vertical line at x=100.

2) The default color of the line might make it hard to see

By changing x to 100.5 using

x = np.linspace(100.5,100.5)

and changing the color of the line to black

plt.plot(x, y, color="k")

The plot becomes

answered Sep 27, 2018 at 9:11

DavidG

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1 Comment

JackLidge Over a year ago

Many thanks! I was trying to plot a diagonal line which goes from bottom right to top left, but I've changed the colour of the line and it now appears to work!

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