Copter: correct terrain-alt logging

Also change to using an out-of-band value upon no-terrain-alt-available
7 years ago · 893b761533
1 changed files with 2 additions and 2 deletions
--- a/ArduCopter/Log.cpp
+++ b/ArduCopter/Log.cpp
@ -115,8 +115,8 @@ void Copter::Log_Write_Control_Tuning()
				@@ -115,8 +115,8 @@ void Copter::Log_Write_Control_Tuning()
    // get terrain altitude
    float terr_alt = 0.0f;
 #if AP_TERRAIN_AVAILABLE && AC_TERRAIN
-    if (terrain.height_above_terrain(terr_alt, true)) {
-        terr_alt = 0.0f;
+    if (!terrain.height_above_terrain(terr_alt, true)) {
+        terr_alt = DataFlash.quiet_nan();
    }
 #endif