Basemap does not fill consistent extent of plot when plotting geopandas features

[robbibt]

Describe the bug
When plotting a geopandas animation with a basemap supplied by basemap_format, the basemap extends only to the bounding box of the spatial data. In the example below, this causes a constantly changing basemap region (starting with a square and ending up with a longer rectangle). This is a disconcerting effect which distracts from the animation itself.

Expected behavior
I would expect the basemap to fill a consistent portion of the total animation figure boundary regardless of the bounding box of the features currently being plotted. For example, I would expect basemap data to be plotted in the following region (red) for this frame:

And the same for this frame:

To Reproduce

import geopandas as gpd
import pandas_alive
import matplotlib.pyplot as plt

# Load data from geojson
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gdf_wide = gpd.read_file(geojson_data).set_index('id')
gdf_wide.plot(edgecolor='black')

# Basemap
basemap = {
    'url': 'https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png',
    'max_zoom': 19,
    'attribution': 'Map data (c) <a href="https://openstreetmap.org">OpenStreetMap</a> contributors',
    'name': 'OpenStreetMap.Mapnik'
}


# Animate
gdf_wide.plot_animated(filename='test.gif',
                       basemap_format={'source': basemap},
                       period_length=1000,
                       edgecolor='black')

Additional context
pandas_alive version '0.2.4'

[JackMcKew]

Hmm this is an interesting problem, do you think the suggested solution should be optional or compulsory?

[robbibt]

Good question - I'd lean towards compulsory because we can already customise the shape of the plotting area/figure using the figsize param. Using the figsize area to define the basemap extent seems to make sense as it already provides its own flexibility (e.g. if a user did want a vertical/narrow area of basemap shown, they could request this with a custom figsize).