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July 25, 2021 13:05
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| #!/usr/bin/env python | |
| import numpy as np | |
| import pandas as pd | |
| import gpxpy | |
| import argparse | |
| R = 6365E3 | |
| RADIUS = 1000 | |
| def main(): | |
| parser = argparse.ArgumentParser() | |
| parser.add_argument('--radius', '-r', default=RADIUS, type=int) | |
| parser.add_argument('waypoint_gpx') | |
| parser.add_argument('track_gpx') | |
| parser.add_argument('output') | |
| args = parser.parse_args() | |
| waypoints = load_gpx_waypoints(args.waypoint_gpx) | |
| track_points = load_gpx_track(args.track_gpx) | |
| distances = distances_between_coord( | |
| waypoints['Latitude'], waypoints['Longitude'], | |
| track_points['Latitude'], track_points['Longitude'] | |
| ) | |
| waypoints['Distance to Route'] = np.min(distances, axis=1) | |
| nearby = waypoints[waypoints['Distance to Route'] < args.radius] | |
| save_waypoint_gpx(nearby, args.output) | |
| def load_gpx_waypoints(gpx_file) -> pd.DataFrame: | |
| with open(gpx_file, 'r') as f: | |
| gpx = gpxpy.parse(f) | |
| waypoints = [{ | |
| "Name": waypoint.name, | |
| "Latitude": waypoint.latitude, | |
| "Longitude": waypoint.longitude, | |
| "Elevation": waypoint.elevation, | |
| "Comment": waypoint.comment | |
| } for waypoint in gpx.waypoints] | |
| return pd.DataFrame(waypoints) | |
| def load_gpx_track(gpx_file) -> pd.DataFrame: | |
| with open(gpx_file, 'r') as f: | |
| gpx = gpxpy.parse(f) | |
| points = [{ | |
| "Name": point.name, | |
| "Latitude": point.latitude, | |
| "Longitude": point.longitude, | |
| "Elevation": point.elevation, | |
| "Comment": point.comment | |
| } for point in gpx.tracks[0].segments[0].points] | |
| return pd.DataFrame(points) | |
| def save_waypoint_gpx(dataframe, filename): | |
| gpx = gpxpy.gpx.GPX() | |
| def create_waypoint(params): | |
| return gpxpy.gpx.GPXWaypoint( | |
| params[1], | |
| params[2], | |
| name=params[0], | |
| comment=params[4] | |
| ) | |
| gpx.waypoints = list(dataframe.apply(create_waypoint, axis=1)) | |
| with open(filename, 'w') as f: | |
| f.write(gpx.to_xml()) | |
| def distances_between_coord(lats1, longs1, lats2, longs2): | |
| """Calculate distances between all combinations of the two lat-long combinations.""" | |
| assert len(lats1) == len(longs1) | |
| assert len(lats2) == len(longs2) | |
| lats1 = np.radians(np.array(lats1)) | |
| longs1 = np.radians(np.array(longs1)) | |
| lats2 = np.radians(np.array(lats2)) | |
| longs2 = np.radians(np.array(longs2)) | |
| len1 = len(lats1) | |
| len2 = len(lats2) | |
| cos_lats1 = np.cos(lats1) | |
| cos_lats2 = np.cos(lats2) | |
| dlat = np.empty((len1, len2)) | |
| dlong = np.empty((len1, len2)) | |
| tiled_lats1 = np.tile(np.atleast_2d(lats1).T, (1, len2,)) | |
| tiled_lats2 = np.tile(np.atleast_2d(lats2), (len1, 1)) | |
| tiled_longs1 = np.tile(np.atleast_2d(longs1).T, (1, len2)) | |
| tiled_longs2 = np.tile(np.atleast_2d(longs2), (len1, 1)) | |
| dlat = tiled_lats2 - tiled_lats1 | |
| del tiled_lats1, tiled_lats2 | |
| dlong = tiled_longs2 - tiled_longs1 | |
| del tiled_longs1, tiled_longs2 | |
| a = np.sin(dlat/2)**2 + np.outer(cos_lats1, cos_lats2) * np.sin(dlong/2)**2 | |
| return 2 * R * np.arctan2(np.sqrt(a), np.sqrt(1-a)) | |
| if __name__ == "__main__": | |
| main() |
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