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extracting points from a graph in python

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I was looking for a way to extract points from 4 graphs i have plotted in Python in order to run the Ramer Douglas peucker algorithm on the points. Ideally the data would be presented in a series of x and y co-ordinates as the current data set is presented differently. Each graph is made up of around 2000 points but they are not formatted as X and Y co-ordinates in the data set. I have attached the code used to plot the graphs as well as the data set if anyone has any suggestions.!AoxfZQIWTCMacLdktiBQeU1ZVTE (data set used to plot graphs)

File for importing route data from a json file

import json
import os
import matplotlib.pyplot as plt
from rdp import rdp
import numpy as np

def get_data(file_name):
    method to retrieve JSON data from "file"
    :param file_name: string representing file in which JSON data is stored
    :return data: Pyhonic data created from JSON file information
    with open(os.path.join(os.sys.path[0], file_name), "r") as data_file:
        data = json.load(data_file)  # load data from JSON file
        return data

if __name__== "__main__":
    file_name = 'json_data.json'
    routes = get_data(file_name)

print("Total Time")
print("Total Distance")

routesPos = 0
edgePos = 0
edgeDistance = 0
alts = []
distances = []

while routesPos < len(routes):
 while edgePos < len(routes[routesPos]["edges"]):
  edgeDistance = edgeDistance + routes[routesPos]["edges"][edgePos]["edgeDistance"]
  edgePos += 1
 plt.plot(distances, alts, color='blue')
 edgeDistance = 0
 routesPos += 1
 edgePos = 0


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