ACQUIRING A DXF FILE OF STREET NETWORKS (that you can use later in Space Syntax programs like DepthmapX)

 

1.  Run OSmnx in Jupyter Notebook. Please google for Professor Boeing’s examples for how to download and run Jupyter Notebook.
2.   In this step we download a street network from Open Street Map to OSmnx then we save the network as a shape file.

           

Copy this piece into Jupyter notebook

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import geopandas as gpd

import momepy

import pandas as pd

import networkx as nx

import osmnx as ox

import matplotlib.pyplot as plt

 

# in this method we define the boudnary of an area and then draw a street network from it

# First we need to load the neighborhood shapefile

# draw a boundary from this address: http://geojson.io/#map=13/24.4209/54.5849 Thank you #GEOJSON!

# we define neighborhood shapefile for example khalifa.shp. Remember to change to your own #path!

neighborhood = gpd.read_file('danang1')

neighborhood.head()

 # we create the bondary's coordinators

polygon = neighborhood['geometry'].iloc[0]

print (polygon)

 

# then we define a graph based on the polygon that we have

# we will use the abreviation, our rule is the first three words

G = ox.graph_from_polygon(polygon, network_type='drive', simplify = False)

G_projected = ox.project_graph(G)

fig, ax = ox.plot_graph(ox.project_graph(G),  filename= 'test1', dpi = 1200, file_format='png', save=True,node_size=0)

 

# save street network as ESRI shapefile to work with in GIS

ox.save_graph_shapefile(G, filename='danang1_shape')

 

3.       As a result we have the shape file. Next step we need to convert this shape file to DXF.

4.       Open QGIS (If you don’t have a QGIS, please download. It is pretty straightforward to I don’t think you have any problems).

Layer à Add Layter à Add vector layer

Find Source, click to three dots button …

Find the location of the shape file. Here we need a street network so we select edges.shp

5.       Last step is export the shape file to dxf.

Project à Import/Export à Export Project to DXF

Pay attention to the location of the dxf file location!

APPENDIX

This section will tell you how to use the boundary area to load the network into OSmnx.

1.       Open geojson.io

2.       Click Draw a polygon

Click the first point to close the boundary

Save à Shapefile