X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;f=simgear%2Fconstants.h;h=8438e1321f08ff6d8af22886024dd21717f146f8;hb=7dfb463ba9ac50e890718612cd6b55373b7cc4a8;hp=0ce5ab9e7866b26745ca10a832a654336f59fe0b;hpb=dcb95d131bc6aef1abe25d1f415e309f06e52436;p=simgear.git

diff --git a/simgear/constants.h b/simgear/constants.h
index 0ce5ab9e..8438e132 100644
--- a/simgear/constants.h
+++ b/simgear/constants.h
@@ -31,14 +31,8 @@
 
 #include <simgear/compiler.h>
 
-#ifdef SG_HAVE_STD_INCLUDES
-#  include <cmath>
-#else
-#  ifdef SG_MATH_EXCEPTION_CLASH
-#    define exception C_exception
-#  endif
-#  include <math.h>
-#endif
+#include <cmath>
+
 
 #include <plib/sg.h>
 
@@ -75,6 +69,8 @@
  *  6378.165 but this is probably close enough */
 #define SG_EARTH_RAD 6378.155
 
+// Maximum terrain elevation from sea level
+#define SG_MAX_ELEVATION_M 9000.0
 
 // Earth parameters for WGS 84, taken from LaRCsim/ls_constants.h
 
@@ -122,22 +118,28 @@
 /** Nautical Miles to Radians */
 #define SG_RAD_TO_NM        3437.7467707849392526
 
-/** Miles per second to Knots */
+/** meters per second to Knots */
 #define SG_MPS_TO_KT        1.9438444924406046432
 
-/** Knots to Miles per second */
+/** Knots to meters per second */
 #define SG_KT_TO_MPS        0.5144444444444444444
 
-/** Miles per second to Miles per hour */
+/** Feet per second to Knots */
+#define SG_FPS_TO_KT        0.5924838012958962841
+
+/** Knots to Feet per second */
+#define SG_KT_TO_FPS        1.6878098571011956874
+
+/** meters per second to Miles per hour */
 #define SG_MPS_TO_MPH       2.2369362920544020312
 
-/** Miles per hour to Miles per second */
+/** meetrs per hour to Miles per second */
 #define SG_MPH_TO_MPS       0.44704
 
 /** Meters per second to Kilometers per hour */
 #define SG_MPS_TO_KMH       3.6
 
-/** Kilometers per hour to Miles per second */
+/** Kilometers per hour to meters per second */
 #define SG_KMH_TO_MPS       0.2777777777777777778
 
 /** Pascal to Inch Mercury */