routingmat.py

import openrouteservice as ors
import numpy as np
from dotenv import load_dotenv
import os





def fetch_matrices(dfadr):

    load_dotenv()
    ors_apikey=os.environ.get("ors_apikey")
    client = ors.Client(key=ors_apikey)

    max_elements=3500
    nb_loc=len(dfadr)
    nb_loc_per_step=max_elements//nb_loc
    nb_steps=int(np.ceil(nb_loc/nb_loc_per_step))

    lonlat=list(zip(*(dfadr.geometry.x, dfadr.geometry.y)))
    lrep=[]
    for i in np.arange(nb_steps):
        idx_dest=np.arange(i*nb_loc_per_step, min([(i+1)*nb_loc_per_step, nb_loc])).tolist()
        lrep.append(ors.distance_matrix.distance_matrix(client=client,
                                                        locations=lonlat,
                                                        destinations=idx_dest,
                                                        metrics=["distance", "duration"],
                                                        units="km",
                                                        resolve_locations=True))

    mat_dist=np.concat([il["distances"] for il in lrep], axis=1)
    mat_dur=np.concat([il["durations"] for il in lrep], axis=1)

    return mat_dist, mat_dur