X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;f=src%2FAirports%2Fsimple.cxx;h=a085fab57ab7804084100bb8cea4983decb7672a;hb=c859833c63d410df84cecd86a2a2e4b60a71821c;hp=c7e486f45a56b95cd0ddac27e5179fe9d7a22fa7;hpb=674a295896a1e56d605f39874262d6f146a586a3;p=flightgear.git

diff --git a/src/Airports/simple.cxx b/src/Airports/simple.cxx
index c7e486f45..a085fab57 100644
--- a/src/Airports/simple.cxx
+++ b/src/Airports/simple.cxx
@@ -143,7 +143,10 @@ FGRunway* FGAirport::getRunwayByIdent(const string& aIdent) const
 
 FGAirport::Runway_iterator
 FGAirport::getIteratorForRunwayIdent(const string& aIdent) const
-{ 
+{
+  if (aIdent.empty())
+    return mRunways.end();
+
   loadRunways();
   
   string ident(aIdent);
@@ -369,7 +372,7 @@ void FGAirport::loadRunways() const
   }
   
   mRunwaysLoaded = true;
-  loadSceneryDefintions();
+  loadSceneryDefinitions();
 }
 
 void FGAirport::loadTaxiways() const
@@ -396,7 +399,7 @@ void FGAirport::loadProcedures() const
   Route::loadAirportProcedures(path, const_cast<FGAirport*>(this));
 }
 
-void FGAirport::loadSceneryDefintions() const
+void FGAirport::loadSceneryDefinitions() const
 {  
   // allow users to disable the scenery data in the short-term
   // longer term, this option can probably disappear
@@ -453,9 +456,13 @@ void FGAirport::readTowerData(SGPropertyNode* aRoot)
   SGPropertyNode* twrNode = aRoot->getChild("tower")->getChild("twr");
   double lat = twrNode->getDoubleValue("lat"), 
     lon = twrNode->getDoubleValue("lon"), 
-    elevM = twrNode->getDoubleValue("elev-m");
-    
-  _tower_location = SGGeod::fromDegM(lon, lat, elevM);
+    elevM = twrNode->getDoubleValue("elev-m");  
+// tower elevation is AGL, not AMSL. Since we don't want to depend on the
+// scenery for a precise terrain elevation, we use the field elevation
+// (this is also what the apt.dat code does)
+  double fieldElevationM = geod().getElevationM();
+  
+  _tower_location = SGGeod::fromDegM(lon, lat, fieldElevationM + elevM);
 }
 
 bool FGAirport::buildApproach(Waypt* aEnroute, STAR* aSTAR, FGRunway* aRwy, WayptVec& aRoute)