Merge pull request #10 from hv92/patch-1

Fix altitude
2017-07-21 05:58:49 -07:00 · 2017-07-21 05:58:49 -07:00 · abafd97b3f
commit abafd97b3f
parent 2fd822d275 0a38231713
1 changed files with 2 additions and 2 deletions
--- a/pyModeS/ehs.py
+++ b/pyModeS/ehs.py
@ -117,12 +117,12 @@ def df20alt(msg):
    if mbit == '0':         # unit in ft
        if qbit == '1':     # 25ft interval
            vbin = mbin[19:25] + mbin[26] + mbin[28:32]
-            alt = util.bin2int(vbin) * 25
+            alt = util.bin2int(vbin) * 25 - 1000
        if qbit == '0':     # 100ft interval
            # to be implemented
            alt = None
    if mbit == '1':         # unit in meter
-        vbin = mbin[19:25] + mbin[26:32]
+        vbin = mbin[19:25] + mbin[26:31]
        alt = int(util.bin2int(vbin) * 3.28084)  # convert to ft

    return alt