imshow not filling the whole extension #2459
Description
Description
When plotting an image with imshow the top and bottom line of pixels has half the width of the rest of lines and the image does not fill the whole extent.
This is not noticeable when the image is big, but is very clear when the image has low resolution.
Code to reproduce
Slightly modified from here: https://scitools.org.uk/cartopy/docs/v0.5/matplotlib/introductory_examples/04.images.html
import numpy as np
import matplotlib.pyplot as plt
import cartopy.crs as ccrs
ax = plt.axes(projection=ccrs.Robinson())
ax.set_global()
img_shape = [2, 4]
img = np.arange(img_shape[0]*img_shape[1]).reshape(img_shape)
ax.imshow(img, origin='upper', extent=[-180, 180, -90, 90], transform=ccrs.PlateCarree())
Produces this plot. While I would expect it to fill the whole area.
By increasing the number of lines, we can see that the top and bottom lines have half the height.
import numpy as np
import matplotlib.pyplot as plt
import cartopy.crs as ccrs
ax = plt.axes(projection=ccrs.Robinson())
ax.set_global()
img_shape = [6, 4]
img = np.arange(img_shape[0]*img_shape[1]).reshape(img_shape)
ax.imshow(img, origin='upper', extent=[-180, 180, -90, 90], transform=ccrs.PlateCarree())
The effect is not noticeable if the code is run with img_shape=[1000, 4]
Full environment definition
Operating system
Tried it with different Linux distributions: Ubuntu 22.04, AlmaLinux9
Cartopy version
0.24
conda list
# Name Version Build Channel
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