#include <math.h>
#include <Math/fg_geodesy.h>
-#include <Include/constants.h>
+#include <Include/fg_constants.h>
/* ONE_SECOND is pi/180/60/60, or about 100 feet at earths' equator */
/* fgGeocToGeod(lat_geoc, radius, *lat_geod, *alt, *sea_level_r)
* INPUTS:
* lat_geoc Geocentric latitude, radians, + = North
- * radius C.G. radius to earth center, ft
+ * radius C.G. radius to earth center (meters)
*
* OUTPUTS:
* lat_geod Geodetic latitude, radians, + = North
- * alt C.G. altitude above mean sea level, ft
+ * alt C.G. altitude above mean sea level (meters)
* sea_level_r radius from earth center to sea level at
- * local vertical (surface normal) of C.G.
+ * local vertical (surface normal) of C.G. (meters)
*/
void fgGeocToGeod( double lat_geoc, double radius, double
|| ( (FG_PI_2 + lat_geoc) < ONE_SECOND ) ) /* near South pole */
{
*lat_geod = lat_geoc;
- *sea_level_r = EQUATORIAL_RADIUS_KM*E;
+ *sea_level_r = EQUATORIAL_RADIUS_M*E;
*alt = radius - *sea_level_r;
} else {
t_lat = tan(lat_geoc);
- x_alpha = E*EQUATORIAL_RADIUS_KM/sqrt(t_lat*t_lat + E*E);
- mu_alpha = atan2(sqrt(RESQ_KM - x_alpha*x_alpha),E*x_alpha);
+ x_alpha = E*EQUATORIAL_RADIUS_M/sqrt(t_lat*t_lat + E*E);
+ mu_alpha = atan2(sqrt(RESQ_M - x_alpha*x_alpha),E*x_alpha);
if (lat_geoc < 0) mu_alpha = - mu_alpha;
sin_mu_a = sin(mu_alpha);
delt_lambda = mu_alpha - lat_geoc;
l_point = radius - r_alpha;
*alt = l_point*cos(delt_lambda);
denom = sqrt(1-EPS*EPS*sin_mu_a*sin_mu_a);
- rho_alpha = EQUATORIAL_RADIUS_KM*(1-EPS)/
+ rho_alpha = EQUATORIAL_RADIUS_M*(1-EPS)/
(denom*denom*denom);
delt_mu = atan2(l_point*sin(delt_lambda),rho_alpha + *alt);
*lat_geod = mu_alpha - delt_mu;
lambda_sl = atan( E*E * tan(*lat_geod) ); /* SL geoc. latitude */
sin_lambda_sl = sin( lambda_sl );
*sea_level_r =
- sqrt(RESQ_KM / (1 + ((1/(E*E))-1)*sin_lambda_sl*sin_lambda_sl));
+ sqrt(RESQ_M / (1 + ((1/(E*E))-1)*sin_lambda_sl*sin_lambda_sl));
}
}
/* fgGeodToGeoc( lat_geod, alt, *sl_radius, *lat_geoc )
* INPUTS:
* lat_geod Geodetic latitude, radians, + = North
- * alt C.G. altitude above mean sea level, ft
+ * alt C.G. altitude above mean sea level (meters)
*
* OUTPUTS:
- * sl_radius SEA LEVEL radius to earth center, ft (add Altitude to
- * get true distance from earth center.
+ * sl_radius SEA LEVEL radius to earth center (meters)
+ * (add Altitude to get true distance from earth center.
* lat_geoc Geocentric latitude, radians, + = North
*
*/
sin_mu = sin(lat_geod); /* Geodetic (map makers') latitude */
cos_mu = cos(lat_geod);
*sl_radius =
- sqrt(RESQ_KM / (1 + ((1/(E*E))-1)*sin_lambda_sl*sin_lambda_sl));
+ sqrt(RESQ_M / (1 + ((1/(E*E))-1)*sin_lambda_sl*sin_lambda_sl));
py = *sl_radius*sin_lambda_sl + alt*sin_mu;
px = *sl_radius*cos_lambda_sl + alt*cos_mu;
*lat_geoc = atan2( py, px );
$Header$
$Log$
+Revision 1.6 1998/07/08 14:40:07 curt
+polar3d.[ch] renamed to polar3d.[ch]xx, vector.[ch] renamed to vector.[ch]xx
+Updated fg_geodesy comments to reflect that routines expect and produce
+ meters.
+
+Revision 1.5 1998/04/25 22:06:23 curt
+Edited cvs log messages in source files ... bad bad bad!
+
+Revision 1.4 1998/01/27 00:47:59 curt
+Incorporated Paul Bleisch's <pbleisch@acm.org> new debug message
+system and commandline/config file processing code.
+
Revision 1.3 1998/01/19 19:27:12 curt
Merged in make system changes from Bob Kuehne <rpk@sgi.com>
This should simplify things tremendously.
/* $Log$
-/* Revision 1.3 1998/01/19 19:27:12 curt
-/* Merged in make system changes from Bob Kuehne <rpk@sgi.com>
-/* This should simplify things tremendously.
+/* Revision 1.6 1998/07/08 14:40:07 curt
+/* polar3d.[ch] renamed to polar3d.[ch]xx, vector.[ch] renamed to vector.[ch]xx
+/* Updated fg_geodesy comments to reflect that routines expect and produce
+/* meters.
/*
+ * Revision 1.5 1998/04/25 22:06:23 curt
+ * Edited cvs log messages in source files ... bad bad bad!
+ *
+ * Revision 1.4 1998/01/27 00:47:59 curt
+ * Incorporated Paul Bleisch's <pbleisch@acm.org> new debug message
+ * system and commandline/config file processing code.
+ *
+ * Revision 1.3 1998/01/19 19:27:12 curt
+ * Merged in make system changes from Bob Kuehne <rpk@sgi.com>
+ * This should simplify things tremendously.
+ *
* Revision 1.2 1997/12/15 23:54:54 curt
* Add xgl wrappers for debugging.
* Generate terrain normals on the fly.