This by default add a padding area of nodata around the map (well at least when using plt.pcolormesh) if you do not set your Axis xmargin and ymargin to zero ax.set_xmargin (0) ax.set_ymargin (0) It ...
When axes aspect='equal', an axis with zero extent might not have any padding, which results in a completely scrambled plot. To reproduce: from matplotlib import pyplot fig = pyplot.figure() ax = ...
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