106 lines
3.7 KiB
Python
Executable File
106 lines
3.7 KiB
Python
Executable File
#!/usr/bin/env python3
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import geopandas as gpd
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import networkx as nx
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import time
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print("Building the graph...")
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# Load shapefiles
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edges_gdf = gpd.read_file('edges.shp')
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nodes_gdf = gpd.read_file('nodes.shp')
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home_points_gdf = gpd.read_file('home_points.shp')
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fdh_gdf = gpd.read_file('fdh.shp')
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# Build the graph
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G = nx.Graph()
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for _, edge in edges_gdf.iterrows():
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G.add_edge(edge['start_node'], edge['end_node'], weight=edge['cost'], type=edge['type'], length=edge['length'], cost=edge['cost'])
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# Create a mapping from fdh_id to node_id for quick lookup
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fdh_to_node = fdh_gdf.set_index('id')['node_id'].to_dict()
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# Identify home nodes
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home_nodes = set(home_points_gdf['drop_point'].dropna())
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# Store the edges connected to home nodes for re-adding later
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home_node_edges = {}
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for node in home_nodes:
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home_node_edges[node] = list(G.edges(node, data=True))
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# Create a new graph to store paths
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home_graph = nx.Graph()
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total = len(home_points_gdf)
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counter = 0
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# Start the timer
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start_time = time.time()
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# Temporary copy of G to modify for each pathfinding operation, excluding home nodes initially
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G_temp = G.copy()
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G_temp.remove_nodes_from(home_nodes)
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# Find the minimum cost path from each home node to its associated FDH node
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for _, home_point in home_points_gdf.iterrows():
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start_node = home_point['drop_point']
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fdh_id = home_point['fdh_id']
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if fdh_id in fdh_to_node and start_node in home_node_edges:
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target_node = fdh_to_node[fdh_id] # Lookup the target_node using fdh_id
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# Temporarily add the start node and its edges back to G_temp for pathfinding
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G_temp.add_node(start_node)
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G_temp.add_edges_from(home_node_edges[start_node])
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try:
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if G_temp.has_node(target_node): # Ensure the target FDH node exists in the graph
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path = nx.shortest_path(G_temp, start_node, target_node, weight='cost')
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for i in range(len(path) - 1):
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#home_graph.add_edge(path[i], path[i+1], weight=G[path[i]][path[i+1]]['cost'])
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# Include fdh_id as an edge attribute
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home_graph.add_edge(path[i], path[i+1], weight=G[path[i]][path[i+1]]['cost'], fdh_id=fdh_id)
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except nx.NetworkXNoPath:
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print(f"No path found from home node {start_node} to FDH node {target_node}.")
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finally:
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# Remove the start node again to reset G_temp for the next iteration
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G_temp.remove_node(start_node)
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counter += 1
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print(f'Progress: {counter}/{total}', end='\r')
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# Stop the timer and print the elapsed time
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end_time = time.time()
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elapsed_time = end_time - start_time
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print(f"\nGraph complete in {elapsed_time:.2f} seconds.")
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print("Saving the network...")
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# Extract edges data from the home_graph to create a GeoDataFrame
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network_data = []
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edge_counter = 0
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total_edges = len(home_graph.edges(data=True))
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for edge in home_graph.edges(data=True):
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start_node, end_node, edge_attrs = edge
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edge_data = edges_gdf[((edges_gdf['start_node'] == start_node) & (edges_gdf['end_node'] == end_node)) |
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((edges_gdf['start_node'] == end_node) & (edges_gdf['end_node'] == start_node))]
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if not edge_data.empty:
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fdh_id = edge_attrs['fdh_id']
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edge_geom = edge_data.iloc[0]['geometry']
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network_data.append({
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'geometry': edge_geom,
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'type': edge_data.iloc[0]['type'],
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'length': edge_data.iloc[0]['length'],
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'cost': edge_data.iloc[0]['cost'],
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'fdh_id': fdh_id
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})
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# Update the progress indicator
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edge_counter += 1
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print(f'Processing edge {edge_counter}/{total_edges}', end='\r')
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network_gdf = gpd.GeoDataFrame(network_data, crs=edges_gdf.crs)
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network_gdf.to_file('network.shp')
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print("\nDone.") |