Merge pull request #28 from dbrooke/fixes

Normalise longitude range for tawhiri predictions

chasemapper/tawhiri.py

@@ -40,6 +40,10 @@ def get_tawhiri_prediction(
     # Create RFC3339-compliant timestamp
     _dt_rfc3339 = launch_datetime.isoformat()
 
+    # Normalise longitude to range 0 to 360
+    if launch_longitude < 0:
+        launch_longitude += 360
+
     _params = {
         "launch_latitude": launch_latitude,
         "launch_longitude": launch_longitude,
@@ -93,6 +97,10 @@ def parse_tawhiri_data(data):
 
         for _point in _trajectory:
 
+            # Normalise longitude to range -180 to 180
+            if _point["longitude"] > 180:
+                _point["longitude"] -= 360
+
             # Create UTC timestamp without using datetime.timestamp(), for Python 2.7 backwards compatibility.
             _dt = parse(_point["datetime"])
             _dt_timestamp = (_dt - _epoch).total_seconds()