X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;f=simgear%2Fmath%2FSGGeodesy.cxx;h=b9974f14c66601be2063896c99d59fc8bfa5adc3;hb=dfea3623f6549c9173fed5149da41285863fc290;hp=e42ce1e3e47946cdc244276a0ea1f72b6892db57;hpb=2c07222ef6e95c95f09db7da1a014bcc8fb845a6;p=simgear.git

diff --git a/simgear/math/SGGeodesy.cxx b/simgear/math/SGGeodesy.cxx
index e42ce1e3..b9974f14 100644
--- a/simgear/math/SGGeodesy.cxx
+++ b/simgear/math/SGGeodesy.cxx
@@ -79,11 +79,30 @@ SGGeodesy::SGCartToGeod(const SGVec3<double>& cart, SGGeod& geod)
   double Y = cart(1);
   double Z = cart(2);
   double XXpYY = X*X+Y*Y;
+  if( XXpYY + Z*Z < 25 ) {
+    // This function fails near the geocenter region, so catch that special case here.
+    // Define the innermost sphere of small radius as earth center and return the 
+    // coordinates 0/0/-EQURAD. It may be any other place on geoide's surface,
+    // the Northpole, Hawaii or Wentorf. This one was easy to code ;-)
+    geod.setLongitudeRad( 0.0 );
+    geod.setLongitudeRad( 0.0 );
+    geod.setElevationM( -EQURAD );
+    return;
+  }
+    
   double sqrtXXpYY = sqrt(XXpYY);
   double p = XXpYY*ra2;
   double q = Z*Z*(1-e2)*ra2;
   double r = 1/6.0*(p+q-e4);
   double s = e4*p*q/(4*r*r*r);
+/* 
+  s*(2+s) is negative for s = [-2..0]
+  slightly negative values for s due to floating point rounding errors
+  cause nan for sqrt(s*(2+s))
+  We can probably clamp the resulting parable to positive numbers
+*/
+  if( s >= -2.0 && s <= 0.0 )
+    s = 0.0;
   double t = pow(1+s+sqrt(s*(2+s)), 1/3.0);
   double u = r*(1+t+1/t);
   double v = sqrt(u*u+e4*q);
@@ -521,7 +540,7 @@ SGGeodesy::courseRad(const SGGeoc& from, const SGGeoc& to)
 }
 
 double
-SGGeodesy::distanceM(const SGGeoc& from, const SGGeoc& to)
+SGGeodesy::distanceRad(const SGGeoc& from, const SGGeoc& to)
 {
   // d = 2*asin(sqrt((sin((lat1-lat2)/2))^2 +
   //            cos(lat1)*cos(lat2)*(sin((lon1-lon2)/2))^2))
@@ -531,5 +550,12 @@ SGGeodesy::distanceM(const SGGeoc& from, const SGGeoc& to)
   double tmp2 = sin(0.5*(from.getLongitudeRad() - to.getLongitudeRad()));
   double square = tmp1*tmp1 + cosLatFrom*cosLatTo*tmp2*tmp2;
   double s = SGMiscd::min(sqrt(SGMiscd::max(square, 0)), 1);
-  return 2 * asin(s) * SG_RAD_TO_NM * SG_NM_TO_METER;
+  return 2 * asin(s);
+}
+
+
+double
+SGGeodesy::distanceM(const SGGeoc& from, const SGGeoc& to)
+{
+  return distanceRad(from, to) * SG_RAD_TO_NM * SG_NM_TO_METER;
 }