From: tsteven4 <tsteven4@gmail.com>
Date: Sun, 18 Dec 2016 23:38:00 +0000 (-0700)
Subject: Fix bug in height filter pointed out by Valerio Messina.  height corrections should... 
X-Git-Tag: archive/raspbian/1.10.0+ds-2+rpi1~1^2~12^2~9^2~9^2~11
X-Git-Url: https://dgit.raspbian.org/%22http://www.example.com/cgi/success/%22http:/www.example.com/cgi/success?a=commitdiff_plain;h=1f5c461064ccf009114326848f1a8f5ae259768c;p=gpsbabel.git

Fix bug in height filter pointed out by Valerio Messina.  height corrections should not be applied if the altitude is unknown.
---

diff --git a/height.cc b/height.cc
index f03e6e7ab..963cae681 100644
--- a/height.cc
+++ b/height.cc
@@ -109,12 +109,14 @@ correct_height(const Waypoint* wpt)
 {
   Waypoint* waypointp = (Waypoint*) wpt;
 
-  if (addopt) {
-    waypointp->altitude += addf;
-  }
-
-  if (wgs84tomslopt) {
-    waypointp->altitude -= wgs84_separation(waypointp->latitude, waypointp->longitude);
+  if (waypointp->altitude != unknown_alt) {
+    if (addopt) {
+      waypointp->altitude += addf;
+    }
+  
+    if (wgs84tomslopt) {
+        waypointp->altitude -= wgs84_separation(waypointp->latitude, waypointp->longitude);
+    }
   }
 }