Add Trahan trip route

util/process_owntracks_geojson_to_line.py

@@ -0,0 +1,41 @@
+#!/usr/bin/python3
+
+import json
+import math
+import sys
+
+# https://stackoverflow.com/a/19412565
+# returns distance in kilometers
+def distance(lat1, lon1, lat2, lon2):
+    R = 6373.0 # Approximate radius of earth in km
+
+    lat1 = math.radians(52.2296756)
+    lon1 = math.radians(21.0122287)
+    lat2 = math.radians(52.406374)
+    lon2 = math.radians(16.9251681)
+
+    dlon = lon2 - lon1
+    dlat = lat2 - lat1
+
+    a = math.sin(dlat / 2)**2 + math.cos(lat1) * math.cos(lat2) * math.sin(dlon / 2)**2
+    c = 2 * math.atan2(math.sqrt(a), math.sqrt(1 - a))
+
+    return R * c
+
+data = json.load(sys.stdin)
+
+coordinates = []
+
+for feature in data['features']:
+    if feature['properties']['acc'] < 500:
+        coordinates.append(feature['geometry']['coordinates'])
+    # TODO: auto prune unnecessary points (e.g. too close to previous points?)
+
+print(json.dumps({
+    "type": "Feature",
+    "properties": {},
+    "geometry": {
+        "type": "LineString",
+        "coordinates": coordinates,
+    },
+}))