OSM network from a buffered coordinate

Use a buffered point to create a networkx graph from OSM.

Use this approach when you have a centre-point, such as a longitude and latitude, and you wish to create a network within a certain radius distance.

from cityseer.tools import io, plot

Define a longitude and latitude, and a buffer distance in meters.

lng, lat = -0.13396079424572427, 51.51371088849723
buffer = 500

A geometry can now be created using the buffered_point_poly function available from the cityseer package’s io module.

poly_wgs, epsg_code = io.buffered_point_poly(lng, lat, buffer)
print(epsg_code)
poly_wgs

You can then use this geometry to specify the boundaries to be used for creating a network using the osm_graph_from_poly function.

G = io.osm_graph_from_poly(poly_wgs, green_footways=False)  # False by default
print(G)
plot.plot_nx(G, plot_geoms=True)

INFO:cityseer.tools.graphs:Generating interpolated edge geometries.
100%|██████████| 3318/3318 [00:00<00:00, 54141.53it/s]
INFO:cityseer.tools.io:Converting networkX graph to CRS code 32630.
INFO:cityseer.tools.io:Processing node x, y coordinates.
100%|██████████| 3094/3094 [00:00<00:00, 689248.81it/s]
INFO:cityseer.tools.io:Processing edge geom coordinates, if present.
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INFO:cityseer.tools.graphs:Removing filler nodes.
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INFO:cityseer.tools.util:Creating edges STR tree.
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INFO:cityseer.tools.graphs:Removing filler nodes.
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INFO:cityseer.tools.graphs:Removing dangling nodes.
INFO:cityseer.tools.graphs:Removing filler nodes.
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INFO:cityseer.tools.util:Creating edges STR tree.
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INFO:cityseer.tools.graphs:Splitting opposing edges.
100%|██████████| 940/940 [00:00<00:00, 295506.35it/s]
INFO:cityseer.tools.graphs:Squashing opposing nodes
INFO:cityseer.tools.graphs:Merging parallel edges within buffer of 25.
100%|██████████| 1143/1143 [00:00<00:00, 190362.51it/s]
INFO:cityseer.tools.util:Creating edges STR tree.
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INFO:cityseer.tools.graphs:Splitting opposing edges.
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INFO:cityseer.tools.graphs:Squashing opposing nodes
INFO:cityseer.tools.graphs:Merging parallel edges within buffer of 25.
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INFO:cityseer.tools.util:Creating edges STR tree.
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INFO:cityseer.tools.graphs:Splitting opposing edges.
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INFO:cityseer.tools.graphs:Squashing opposing nodes
INFO:cityseer.tools.graphs:Merging parallel edges within buffer of 25.
100%|██████████| 1147/1147 [00:00<00:00, 433958.75it/s]
INFO:cityseer.tools.util:Creating edges STR tree.
100%|██████████| 1147/1147 [00:00<00:00, 1414128.95it/s]
INFO:cityseer.tools.graphs:Splitting opposing edges.
100%|██████████| 940/940 [00:00<00:00, 66771.31it/s]
INFO:cityseer.tools.graphs:Squashing opposing nodes
INFO:cityseer.tools.graphs:Merging parallel edges within buffer of 25.
100%|██████████| 1147/1147 [00:00<00:00, 364929.58it/s]
INFO:cityseer.tools.util:Creating nodes STR tree
100%|██████████| 940/940 [00:00<00:00, 51693.95it/s]
INFO:cityseer.tools.graphs:Consolidating nodes.
100%|██████████| 940/940 [00:00<00:00, 283541.59it/s]
INFO:cityseer.tools.graphs:Merging parallel edges within buffer of 25.
100%|██████████| 1147/1147 [00:00<00:00, 478693.20it/s]
INFO:cityseer.tools.graphs:Removing filler nodes.
100%|██████████| 940/940 [00:00<00:00, 820188.43it/s]
INFO:cityseer.tools.util:Creating nodes STR tree
100%|██████████| 937/937 [00:00<00:00, 74495.09it/s]
INFO:cityseer.tools.graphs:Consolidating nodes.
100%|██████████| 937/937 [00:00<00:00, 6607.85it/s]
INFO:cityseer.tools.graphs:Merging parallel edges within buffer of 25.
100%|██████████| 1063/1063 [00:00<00:00, 13900.20it/s]
INFO:cityseer.tools.graphs:Removing filler nodes.
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INFO:cityseer.tools.util:Creating nodes STR tree
100%|██████████| 869/869 [00:00<00:00, 100814.58it/s]
INFO:cityseer.tools.graphs:Consolidating nodes.
100%|██████████| 869/869 [00:00<00:00, 95854.05it/s]
INFO:cityseer.tools.graphs:Merging parallel edges within buffer of 25.
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INFO:cityseer.tools.graphs:Removing filler nodes.
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INFO:cityseer.tools.util:Creating nodes STR tree
100%|██████████| 868/868 [00:00<00:00, 93335.79it/s]
INFO:cityseer.tools.graphs:Consolidating nodes.
100%|██████████| 868/868 [00:00<00:00, 18575.25it/s]
INFO:cityseer.tools.graphs:Merging parallel edges within buffer of 25.
100%|██████████| 1023/1023 [00:00<00:00, 238336.55it/s]
INFO:cityseer.tools.graphs:Removing filler nodes.
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INFO:cityseer.tools.util:Creating nodes STR tree
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INFO:cityseer.tools.util:Creating edges STR tree.
100%|██████████| 1020/1020 [00:00<00:00, 1108626.61it/s]
INFO:cityseer.tools.graphs:Snapping gapped endings.
100%|██████████| 855/855 [00:00<00:00, 22494.57it/s]
INFO:cityseer.tools.util:Creating edges STR tree.
100%|██████████| 1075/1075 [00:00<00:00, 1345130.31it/s]
INFO:cityseer.tools.graphs:Splitting opposing edges.
100%|██████████| 855/855 [00:00<00:00, 22278.39it/s]
INFO:cityseer.tools.graphs:Merging parallel edges within buffer of 25.
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INFO:cityseer.tools.graphs:Removing dangling nodes.
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INFO:cityseer.tools.graphs:Removing filler nodes.
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INFO:cityseer.tools.util:Creating edges STR tree.
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INFO:cityseer.tools.graphs:Splitting opposing edges.
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INFO:cityseer.tools.graphs:Squashing opposing nodes
INFO:cityseer.tools.graphs:Merging parallel edges within buffer of 25.
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INFO:cityseer.tools.util:Creating nodes STR tree
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INFO:cityseer.tools.graphs:Consolidating nodes.
100%|██████████| 548/548 [00:00<00:00, 1559.20it/s]
INFO:cityseer.tools.graphs:Merging parallel edges within buffer of 25.
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INFO:cityseer.tools.util:Creating edges STR tree.
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INFO:cityseer.tools.graphs:Splitting opposing edges.
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INFO:cityseer.tools.graphs:Squashing opposing nodes
INFO:cityseer.tools.graphs:Merging parallel edges within buffer of 25.
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INFO:cityseer.tools.util:Creating nodes STR tree
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INFO:cityseer.tools.graphs:Consolidating nodes.
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INFO:cityseer.tools.graphs:Merging parallel edges within buffer of 25.
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INFO:cityseer.tools.graphs:Removing filler nodes.
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INFO:cityseer.tools.graphs:Merging parallel edges within buffer of 50.
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INFO:cityseer.tools.graphs:Ironing edges.
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INFO:cityseer.tools.graphs:Merging parallel edges within buffer of 1.
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INFO:cityseer.tools.graphs:Removing dangling nodes.
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INFO:cityseer.tools.graphs:Removing filler nodes.
100%|██████████| 320/320 [00:00<00:00, 232936.01it/s]
INFO:cityseer.tools.plot:Preparing graph nodes
INFO:cityseer.tools.plot:Preparing graph edges

MultiGraph with 313 nodes and 481 edges

100%|██████████| 481/481 [00:00<00:00, 38625.72it/s]

Set the projected parameter to True if you would rather use the local UTM projection for the boundary.

poly_utm, epsg_code = io.buffered_point_poly(lng, lat, buffer, projected=True)
print(epsg_code)
poly_utm

In this case, remember to set the poly_crs parameter to the appropriate UTM CRS if using the resultant geometry as a parameter for the osm_graph_from_poly function.

G_utm = io.osm_graph_from_poly(poly_utm, poly_crs_code=epsg_code)
print(G_utm)
plot.plot_nx(G_utm, plot_geoms=True)

INFO:cityseer.tools.graphs:Generating interpolated edge geometries.
INFO:cityseer.tools.io:Converting networkX graph to CRS code 32630.
INFO:cityseer.tools.io:Processing node x, y coordinates.
INFO:cityseer.tools.io:Processing edge geom coordinates, if present.
INFO:cityseer.tools.graphs:Removing filler nodes.
INFO:cityseer.tools.util:Creating edges STR tree.
INFO:cityseer.tools.graphs:Removing filler nodes.
INFO:cityseer.tools.graphs:Removing dangling nodes.
INFO:cityseer.tools.graphs:Removing filler nodes.
INFO:cityseer.tools.util:Creating edges STR tree.
INFO:cityseer.tools.graphs:Splitting opposing edges.
INFO:cityseer.tools.graphs:Squashing opposing nodes
INFO:cityseer.tools.graphs:Merging parallel edges within buffer of 25.
INFO:cityseer.tools.util:Creating edges STR tree.
INFO:cityseer.tools.graphs:Splitting opposing edges.
INFO:cityseer.tools.graphs:Squashing opposing nodes
INFO:cityseer.tools.graphs:Merging parallel edges within buffer of 25.
INFO:cityseer.tools.util:Creating edges STR tree.
INFO:cityseer.tools.graphs:Splitting opposing edges.
INFO:cityseer.tools.graphs:Squashing opposing nodes
INFO:cityseer.tools.graphs:Merging parallel edges within buffer of 25.
INFO:cityseer.tools.util:Creating edges STR tree.
INFO:cityseer.tools.graphs:Splitting opposing edges.
INFO:cityseer.tools.graphs:Squashing opposing nodes
INFO:cityseer.tools.graphs:Merging parallel edges within buffer of 25.
INFO:cityseer.tools.util:Creating nodes STR tree
INFO:cityseer.tools.graphs:Consolidating nodes.
INFO:cityseer.tools.graphs:Merging parallel edges within buffer of 25.
INFO:cityseer.tools.graphs:Removing filler nodes.
INFO:cityseer.tools.util:Creating nodes STR tree
INFO:cityseer.tools.graphs:Consolidating nodes.
INFO:cityseer.tools.graphs:Merging parallel edges within buffer of 25.
INFO:cityseer.tools.graphs:Removing filler nodes.
INFO:cityseer.tools.util:Creating nodes STR tree
INFO:cityseer.tools.graphs:Consolidating nodes.
INFO:cityseer.tools.graphs:Merging parallel edges within buffer of 25.
INFO:cityseer.tools.graphs:Removing filler nodes.
INFO:cityseer.tools.util:Creating nodes STR tree
INFO:cityseer.tools.graphs:Consolidating nodes.
INFO:cityseer.tools.graphs:Merging parallel edges within buffer of 25.
INFO:cityseer.tools.graphs:Removing filler nodes.
INFO:cityseer.tools.util:Creating nodes STR tree
INFO:cityseer.tools.util:Creating edges STR tree.
INFO:cityseer.tools.graphs:Snapping gapped endings.
INFO:cityseer.tools.util:Creating edges STR tree.
INFO:cityseer.tools.graphs:Splitting opposing edges.
INFO:cityseer.tools.graphs:Merging parallel edges within buffer of 25.
INFO:cityseer.tools.graphs:Removing dangling nodes.
INFO:cityseer.tools.graphs:Removing filler nodes.
INFO:cityseer.tools.util:Creating edges STR tree.
INFO:cityseer.tools.graphs:Splitting opposing edges.
INFO:cityseer.tools.graphs:Squashing opposing nodes
INFO:cityseer.tools.graphs:Merging parallel edges within buffer of 25.
INFO:cityseer.tools.util:Creating nodes STR tree
INFO:cityseer.tools.graphs:Consolidating nodes.
INFO:cityseer.tools.graphs:Merging parallel edges within buffer of 25.
INFO:cityseer.tools.util:Creating edges STR tree.
INFO:cityseer.tools.graphs:Splitting opposing edges.
INFO:cityseer.tools.graphs:Squashing opposing nodes
INFO:cityseer.tools.graphs:Merging parallel edges within buffer of 25.
INFO:cityseer.tools.util:Creating nodes STR tree
INFO:cityseer.tools.graphs:Consolidating nodes.
INFO:cityseer.tools.graphs:Merging parallel edges within buffer of 25.
INFO:cityseer.tools.graphs:Removing filler nodes.
INFO:cityseer.tools.graphs:Merging parallel edges within buffer of 50.
INFO:cityseer.tools.graphs:Ironing edges.
INFO:cityseer.tools.graphs:Merging parallel edges within buffer of 1.
INFO:cityseer.tools.graphs:Removing dangling nodes.
INFO:cityseer.tools.graphs:Removing filler nodes.
INFO:cityseer.tools.plot:Preparing graph nodes
INFO:cityseer.tools.plot:Preparing graph edges

MultiGraph with 320 nodes and 487 edges