OSMnx: Create rectangular building footprints

Question

I'm using the sample "make_plot" function shown in the example page on the OSMnx repo page to generate maps of building footprints. The output is a square image, is there any way to adjust the height and width to produce a rectangular file?

I made some changes to the example to use the geometries module instead of the deprecated footprints:

def make_plot(place, point, dist, network_type='all', bldg_color='#FF0000', dpi=300,
            default_width=1,
            street_widths = {
                "footway": 0.5,
                "steps": 0.5,
                "pedestrian": 0.5,
                "service": 0.5,
                "path": 0.5,
                "track": 0.5,
                "primary": 0.5,
                "secondary": 0.5,
                "trunk": 1,
                "motorway": 2 ,
                }):
gdf = ox.geometries.geometries_from_point(center_point=point, tags={'building':True}, dist=dist)
fig, ax = ox.plot_figure_ground(point=point, dist=dist, network_type=network_type,
                                default_width=default_width, street_widths=street_widths, save=False, show=False, close=True, bgcolor='#343434')
fig, ax = ox.plot.plot_footprints(gdf, ax=ax, color=bldg_color,
                            save=True, show=False, close=True, filepath="images/{}.png".format(place), dpi=dpi)

make_plot(place, point, dist)

score 1 · Accepted Answer · answered Oct 02 '20 at 22:14

1

The output is a square image, is there any way to adjust the height and width to produce a rectangular file?

You are querying a square area, so your plot of the results is correspondingly square. If you query a non-square area, you get a non-square plot:

import osmnx as ox
ox.config(use_cache=True, log_console=True)
gdf = ox.geometries_from_place('Piedmont, CA, USA', tags={'building':True})
fig, ax = ox.plot_footprints(gdf)

Note that you get a fig, ax back, and you can of course resize your figure the usual matplotlib way: fig.set_size_inches(9, 3). Note that this resizes your figure rather than stretch it (e.g., from a square to a rectangle). Also note that all OSMnx plotting functions take an optional figsize argument. See the documentation.

I made some changes to the example to use the geometries module instead of the deprecated footprints

The examples were updated a month ago when OSMnx v0.16.0 was released, to reflect the new geometries module. Any references to the deprecated footprints module were removed then as well.

answered Oct 02 '20 at 22:14

gboeing

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Thank you, I will try that. I didn't adjust figsize because the docstring under the plot_figure_ground function in plot.py said: "figsize : numeric (width, height) of figure, should be equal". I'll try messing with it though – tykom Oct 03 '20 at 01:16
1

That specific helper function exists to create square plots by querying square areas. If you don't want a square study area, don't use that helper function. – gboeing Oct 03 '20 at 01:27
Turns out I was looking at the examples from 0.11 for some reason. I appreciate your help, osmnx is an incredible package – tykom Oct 03 '20 at 05:07
I used the updates helper function in the example you linked and the footprints do not fill the image completely, there is a small border around the edge of the map. How can I generate maps where the footprints and roads fill the entire image? – tykom Oct 03 '20 at 15:06
Here are two examples, same map, different distances: [Example 1](https://imgur.com/QGAShPf) [Example 2](https://imgur.com/FJuVl5a) – tykom Oct 03 '20 at 15:19

OSMnx: Create rectangular building footprints

1 Answers1