fix error in surface position with reference

2016-11-10 13:45:36 +01:00 · 2016-11-10 13:45:36 +01:00 · b9c6db6f65
commit b9c6db6f65
parent 220b8e9716
2 changed files with 4 additions and 4 deletions
--- a/pyModeS/adsb.py
+++ b/pyModeS/adsb.py
@ -427,9 +427,9 @@ def surface_position_with_ref(msg, lat_ref, lon_ref):
    ni = _cprNL(lat) - i

    if ni > 0:
-        d_lon = 360.0 / ni
+        d_lon = 90.0 / ni
    else:
-        d_lon = 360.0
+        d_lon = 90.0

    m = util.floor(lon_ref / d_lon) \
        + util.floor(0.5 + ((lon_ref % d_lon) / d_lon) - cprlon)
--- a/tests/test_adsb.py
+++ b/tests/test_adsb.py
@ -32,9 +32,9 @@ def test_adsb_airborne_position_with_ref():


 def test_adsb_surface_position_with_ref():
-    pos = adsb.surface_position_with_ref("8FC8200A3AB8F5F893096B22B4A8",
+    pos = adsb.surface_position_with_ref("8FC8200A3AB8F5F893096B000000",
                                         -43.5, 172.5)
-    assert pos == (-43.48564, 175.87195)
+    assert pos == (-43.48564, 172.53942)


 def test_adsb_surface_position():