Exporting network to GMNS

In this example, we export a simple network to GMNS format. The source AequilibraE model used as input for this is the result of the import process (create_from_gmns()) using the GMNS example of Arlington Signals, which can be found in the GMNS repository on GitHub: zephyr-data-specs/GMNS

References

• Exporting AequilibraE model to GMNS format

See also

Several functions, methods, classes and modules are used in this example:

• aequilibrae.project.Network.export_to_gmns()

# Imports
from uuid import uuid4
import os
from tempfile import gettempdir

from aequilibrae.utils.create_example import create_example
import folium
import geopandas as gpd
import pandas as pd

# We load the example project inside a temp folder
fldr = os.path.join(gettempdir(), uuid4().hex)

project = create_example(fldr)

We export the network to CSV files in GMNS format, that will be saved inside the project folder

output_fldr = os.path.join(gettempdir(), uuid4().hex)
if not os.path.exists(output_fldr):
    os.mkdir(output_fldr)

project.network.export_to_gmns(path=output_fldr)

Now, let’s plot a map. This map can be compared with the images of the README.md file located in this example repository on GitHub: zephyr-data-specs/GMNS

links = pd.read_csv(os.path.join(output_fldr, "link.csv"))
nodes = pd.read_csv(os.path.join(output_fldr, "node.csv"))

We turn the links and nodes DataFrames into GeoDataFrames so we can plot them more easily.

links = gpd.GeoDataFrame(links, geometry=gpd.GeoSeries.from_wkt(links["geometry"]), crs=4326)
nodes = gpd.GeoDataFrame(nodes, geometry=gpd.GeoSeries.from_xy(nodes["x_coord"], nodes["y_coord"]), crs=4326)

Let’s plot our map!

map = links.explore(color="black", style_kwds={"weight": 2}, tool_tip="link_type", name="links")
map = nodes.explore(m=map, color="red", style_kwds={"radius": 5, "fillOpacity": 1.0}, name="nodes")

folium.LayerControl().add_to(map) # Add a layer control button to our map
map

Make this Notebook Trusted to load map: File -> Trust Notebook

project.close()

This project at /tmp/b90776faced74b10a06fa7e903ac2aa1 is already closed