Legend for Line Loading Plot

[Elias Althoff]

Dear all,

is there a built in way to activate the legend for the line_loading plot? I am trying to create a plot that shows the hours in which the lines are overloaded. It works so far, but I somehow cant manage to add a legend to the plot.

This is what I am using right now:

loading_factors = loading_factors[loading_factors > 1].count()
fig,ax = plt.subplots(1,1,subplot_kw={"projection":ccrs.PlateCarree()})
fig.set_size_inches(6,6)
handles = loading_factors      
network.plot(ax=ax,bus_sizes=0.001,line_colors=loading_factors,line_cmap=plt.cm.jet,title="Anzahl Stunden mit Überlastung")
ax.legend(handles)
fig.tight_layout()

I know this is more a coding problem than a pypsa problem, but Im guessing there are some more built in functions in the plots than I know of. So maybe there is an easy solution for this. 

Best wishes,

Elias

[Fabian Neumann]

Hi Elias,

yes, that's a pain point. I use the following, but it's not great:

import matplotlib.colors as mcolors
import matplotlib.pyplot as plt

fig, ax = ...

cmap= plt.cm.OrRd
norm = mcolors.Normalize(vmin=0, vmax=100)
sm = plt.cm.ScalarMappable(cmap=cmap, norm=norm)
sm.set_array([])

colors = list(map(mcolors.to_hex, cmap(norm(line_loading))))

n.plot(ax=ax, line_colors=colors, ...)

plt.colorbar(sm, orientation='vertical', shrink=0.7, ax=ax, label=...)

Best wishes,

Fabian N

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Department of Digital Transformation in Energy Systems
Institute of Energy Technology
Technische Universität Berlin

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