Moved wgs_84 time and distance calc routines to fg_geodesy.[ch]xx
This commit is contained in:
curt
parent
f565b1fdbe
commit
229ba460d8
1 changed files with 2 additions and 214 deletions
|
|
@ -952,7 +952,8 @@ void TgtAptDialog_OK (puObject *)
|
|||
MakeTargetDistanceStr( APData, distance );
|
||||
// This changes the AutoPilot Heading
|
||||
// following cast needed
|
||||
ApHeadingDialogInput->setValue ((float)APData->TargetHeading );
|
||||
ApHeadingDialogInput->
|
||||
setValue((float)APData->TargetHeading);
|
||||
// Force this !
|
||||
APData->waypoint_hold = true ;
|
||||
APData->heading_hold = true;
|
||||
|
|
@ -1688,216 +1689,3 @@ static double LinearExtrapolate( double x, double x1, double y1, double x2, doub
|
|||
return ( y );
|
||||
|
||||
};
|
||||
|
||||
|
||||
/* Direct and inverse distance functions */
|
||||
/** Proceedings of the 7th International Symposium on Geodetic
|
||||
Computations, 1985
|
||||
"The Nested Coefficient Method for Accurate Solutions of Direct
|
||||
and
|
||||
Inverse Geodetic Problems With Any Length"
|
||||
Zhang Xue-Lian
|
||||
pp 747-763
|
||||
*/
|
||||
/* modified for FlightGear to use WGS84 only Norman Vine */
|
||||
|
||||
//#include "dstazfns.h"
|
||||
#include <math.h>
|
||||
#define GEOD_INV_PI (3.14159265358979323846)
|
||||
|
||||
/* s == distance */
|
||||
/* az = azimuth */
|
||||
|
||||
/* for WGS_84 a = 6378137.000, rf = 298.257223563; */
|
||||
|
||||
static double M0( double e2 )
|
||||
{ //double e4 = e2*e2;
|
||||
return GEOD_INV_PI*(1.0 - e2*( 1.0/4.0 + e2*( 3.0/64.0 + e2*(5.0/256.0) )))/2.0;
|
||||
}
|
||||
/* s == distance */
|
||||
int geo_direct_wgs_84 ( double alt, double lat1, double lon1, double az1, double s,
|
||||
double *lat2, double *lon2, double *az2 )
|
||||
{
|
||||
double a = 6378137.000, rf = 298.257223563;
|
||||
double RADDEG = (GEOD_INV_PI)/180.0, testv = 1.0E-10;
|
||||
double f = ( rf > 0.0 ? 1.0/rf : 0.0 );
|
||||
double b = a*(1.0-f), e2 = f*(2.0-f);
|
||||
double phi1 = lat1*RADDEG, lam1 = lon1*RADDEG;
|
||||
double sinphi1 = sin(phi1), cosphi1 = cos(phi1);
|
||||
double azm1 = az1*RADDEG;
|
||||
double sinaz1 = sin(azm1), cosaz1 = cos(azm1);
|
||||
|
||||
|
||||
if( fabs(s) < 0.01 ) /* distance < centimeter => congruency */
|
||||
{ *lat2 = lat1;
|
||||
*lon2 = lon1;
|
||||
*az2 = 180.0 + az1;
|
||||
if( *az2 > 360.0 ) *az2 -= 360.0;
|
||||
return 0;
|
||||
}
|
||||
else
|
||||
if( cosphi1 ) /* non-polar origin */
|
||||
{ /* u1 is reduced latitude */
|
||||
double tanu1 = sqrt(1.0-e2)*sinphi1/cosphi1;
|
||||
double sig1 = atan2(tanu1,cosaz1);
|
||||
double cosu1 = 1.0/sqrt( 1.0 + tanu1*tanu1 ), sinu1 = tanu1*cosu1;
|
||||
double sinaz = cosu1*sinaz1, cos2saz = 1.0-sinaz*sinaz;
|
||||
double us = cos2saz*e2/(1.0-e2);
|
||||
/* Terms */
|
||||
double ta = 1.0+us*(4096.0+us*(-768.0+us*(320.0-175.0*us)))/16384.0,
|
||||
tb = us*(256.0+us*(-128.0+us*(74.0-47.0*us)))/1024.0,
|
||||
tc = 0;
|
||||
/* FIRST ESTIMATE OF SIGMA (SIG) */
|
||||
double first = s/(b*ta); /* !!*/
|
||||
double sig = first;
|
||||
double c2sigm, sinsig,cossig, temp,denom,rnumer, dlams, dlam;
|
||||
do
|
||||
{ c2sigm = cos(2.0*sig1+sig);
|
||||
sinsig = sin(sig); cossig = cos(sig);
|
||||
temp = sig;
|
||||
sig = first +
|
||||
tb*sinsig*(c2sigm+tb*(cossig*(-1.0+2.0*c2sigm*c2sigm) -
|
||||
tb*c2sigm*(-3.0+4.0*sinsig*sinsig)
|
||||
*(-3.0+4.0*c2sigm*c2sigm)/6.0)
|
||||
/4.0);
|
||||
}
|
||||
while( fabs(sig-temp) > testv);
|
||||
/* LATITUDE OF POINT 2 */
|
||||
/* DENOMINATOR IN 2 PARTS (TEMP ALSO USED LATER) */
|
||||
temp = sinu1*sinsig-cosu1*cossig*cosaz1;
|
||||
denom = (1.0-f)*sqrt(sinaz*sinaz+temp*temp);
|
||||
/* NUMERATOR */
|
||||
rnumer = sinu1*cossig+cosu1*sinsig*cosaz1;
|
||||
*lat2 = atan2(rnumer,denom)/RADDEG;
|
||||
/* DIFFERENCE IN LONGITUDE ON AUXILARY SPHERE (DLAMS ) */
|
||||
rnumer = sinsig*sinaz1;
|
||||
denom = cosu1*cossig-sinu1*sinsig*cosaz1;
|
||||
dlams = atan2(rnumer,denom);
|
||||
/* TERM C */
|
||||
tc = f*cos2saz*(4.0+f*(4.0-3.0*cos2saz))/16.0;
|
||||
/* DIFFERENCE IN LONGITUDE */
|
||||
dlam = dlams-(1.0-tc)*f*sinaz*(sig+tc*sinsig*
|
||||
(c2sigm+
|
||||
tc*cossig*(-1.0+2.0*
|
||||
c2sigm*c2sigm)));
|
||||
*lon2 = (lam1+dlam)/RADDEG;
|
||||
if(*lon2 > 180.0 ) *lon2 -= 360.0;
|
||||
if(*lon2 < -180.0 ) *lon2 += 360.0;
|
||||
/* AZIMUTH - FROM NORTH */
|
||||
*az2 = atan2(-sinaz,temp)/RADDEG;
|
||||
if( fabs(*az2) < testv ) *az2 = 0.0;
|
||||
if( *az2 < 0.0) *az2 += 360.0;
|
||||
return 0;
|
||||
}
|
||||
else /* phi1 == 90 degrees, polar origin */
|
||||
{ double dM = a*M0(e2) - s;
|
||||
double paz = ( phi1 < 0.0 ? 180.0 : 0.0 );
|
||||
return geo_direct_wgs_84( alt, 0.0, lon1, paz, dM,lat2,lon2,az2 );
|
||||
}
|
||||
}
|
||||
|
||||
int geo_inverse_wgs_84( double alt, double lat1, double lon1, double lat2,
|
||||
double lon2, double *az1, double *az2, double *s )
|
||||
{
|
||||
double a = 6378137.000, rf = 298.257223563;
|
||||
int iter=0;
|
||||
double RADDEG = (GEOD_INV_PI)/180.0, testv = 1.0E-10;
|
||||
double f = ( rf > 0.0 ? 1.0/rf : 0.0 );
|
||||
double b = a*(1.0-f), e2 = f*(2.0-f);
|
||||
double phi1 = lat1*RADDEG, lam1 = lon1*RADDEG;
|
||||
double sinphi1 = sin(phi1), cosphi1 = cos(phi1);
|
||||
double phi2 = lat2*RADDEG, lam2 = lon2*RADDEG;
|
||||
double sinphi2 = sin(phi2), cosphi2 = cos(phi2);
|
||||
|
||||
if( (fabs(lat1-lat2) < testv &&
|
||||
( fabs(lon1-lon2) < testv) || fabs(lat1-90.0) < testv ) )
|
||||
{ /* TWO STATIONS ARE IDENTICAL : SET DISTANCE & AZIMUTHS TO ZERO */
|
||||
*az1 = 0.0; *az2 = 0.0; *s = 0.0;
|
||||
return 0;
|
||||
} else
|
||||
if( fabs(cosphi1) < testv ) /* initial point is polar */
|
||||
{
|
||||
int k = geo_inverse_wgs_84( alt, lat2,lon2,lat1,lon1, az1,az2,s );
|
||||
b = *az1; *az1 = *az2; *az2 = b;
|
||||
return 0;
|
||||
} else
|
||||
if( fabs(cosphi2) < testv ) /* terminal point is polar */
|
||||
{
|
||||
int k = geo_inverse_wgs_84( alt, lat1,lon1,lat1,lon1+180.0,
|
||||
az1,az2,s );
|
||||
*s /= 2.0;
|
||||
*az2 = *az1 + 180.0;
|
||||
if( *az2 > 360.0 ) *az2 -= 360.0;
|
||||
return 0;
|
||||
} else /* Geodesic passes through the pole (antipodal) */
|
||||
if( (fabs( fabs(lon1-lon2) - 180 ) < testv) &&
|
||||
(fabs(lat1+lat2) < testv) )
|
||||
{
|
||||
double s1,s2;
|
||||
geo_inverse_wgs_84( alt, lat1,lon1, lat1,lon2, az1,az2, &s1 );
|
||||
geo_inverse_wgs_84( alt, lat2,lon2, lat1,lon2, az1,az2, &s2 );
|
||||
*az2 = *az1;
|
||||
*s = s1 + s2;
|
||||
return 0;
|
||||
} else /* antipodal and polar points don't get here */
|
||||
{
|
||||
double dlam = lam2 - lam1, dlams = dlam;
|
||||
double sdlams,cdlams, sig,sinsig,cossig, sinaz,
|
||||
cos2saz, c2sigm;
|
||||
double tc,temp, us,rnumer,denom, ta,tb;
|
||||
double cosu1,sinu1, sinu2,cosu2;
|
||||
/* Reduced latitudes */
|
||||
temp = (1.0-f)*sinphi1/cosphi1;
|
||||
cosu1 = 1.0/sqrt(1.0+temp*temp);
|
||||
sinu1 = temp*cosu1;
|
||||
temp = (1.0-f)*sinphi2/cosphi2;
|
||||
cosu2 = 1.0/sqrt(1.0+temp*temp);
|
||||
sinu2 = temp*cosu2;
|
||||
|
||||
do {
|
||||
sdlams = sin(dlams), cdlams = cos(dlams);
|
||||
sinsig = sqrt(cosu2*cosu2*sdlams*sdlams+
|
||||
(cosu1*sinu2-sinu1*cosu2*cdlams)*
|
||||
(cosu1*sinu2-sinu1*cosu2*cdlams));
|
||||
cossig = sinu1*sinu2+cosu1*cosu2*cdlams;
|
||||
|
||||
sig = atan2(sinsig,cossig);
|
||||
sinaz = cosu1*cosu2*sdlams/sinsig;
|
||||
cos2saz = 1.0-sinaz*sinaz;
|
||||
c2sigm = (sinu1 == 0.0 || sinu2 == 0.0 ? cossig :
|
||||
cossig-2.0*sinu1*sinu2/cos2saz);
|
||||
tc = f*cos2saz*(4.0+f*(4.0-3.0*cos2saz))/16.0;
|
||||
temp = dlams;
|
||||
dlams = dlam+(1.0-tc)*f*sinaz*
|
||||
(sig+tc*sinsig*
|
||||
(c2sigm+tc*cossig*(-1.0+2.0*c2sigm*c2sigm)));
|
||||
if (fabs(dlams) > GEOD_INV_PI && iter++ > 50)
|
||||
return iter;
|
||||
} while ( fabs(temp-dlams) > testv);
|
||||
|
||||
us = cos2saz*(a*a-b*b)/(b*b); /* !! */
|
||||
/* BACK AZIMUTH FROM NORTH */
|
||||
rnumer = -(cosu1*sdlams);
|
||||
denom = sinu1*cosu2-cosu1*sinu2*cdlams;
|
||||
*az2 = atan2(rnumer,denom)/RADDEG;
|
||||
if( fabs(*az2) < testv ) *az2 = 0.0;
|
||||
if(*az2 < 0.0) *az2 += 360.0;
|
||||
/* FORWARD AZIMUTH FROM NORTH */
|
||||
rnumer = cosu2*sdlams;
|
||||
denom = cosu1*sinu2-sinu1*cosu2*cdlams;
|
||||
*az1 = atan2(rnumer,denom)/RADDEG;
|
||||
if( fabs(*az1) < testv ) *az1 = 0.0;
|
||||
if(*az1 < 0.0) *az1 += 360.0;
|
||||
/* Terms a & b */
|
||||
ta = 1.0+us*(4096.0+us*(-768.0+us*(320.0-175.0*us)))/
|
||||
16384.0;
|
||||
tb = us*(256.0+us*(-128.0+us*(74.0-47.0*us)))/1024.0;
|
||||
/* GEODETIC DISTANCE */
|
||||
*s = b*ta*(sig-tb*sinsig*
|
||||
(c2sigm+tb*(cossig*(-1.0+2.0*c2sigm*c2sigm)-tb*
|
||||
c2sigm*(-3.0+4.0*sinsig*sinsig)*
|
||||
(-3.0+4.0*c2sigm*c2sigm)/6.0)/
|
||||
4.0));
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
|
|
|
|||
Loading…
Add table
Reference in a new issue