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Commit e76453c5 authored by Uwe Schulzweida's avatar Uwe Schulzweida
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Merge declaration and initialization.

parent abdf4da2
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src/grid_rot.cc
View file @ e76453c5
......@@ -7,6 +7,8 @@
double lamrot_to_lam(double phirot, double lamrot, double polphi, double pollam, double polgam)
{
/*
Name of the original Fortran function: PHTOPHS
This function converts lambda from one rotated system to lambda in another system.
If the optional argument polgam is present, the other system can also be a rotated one,
where polgam is the angle between the two north poles.
......@@ -20,8 +22,6 @@ double lamrot_to_lam(double phirot, double lamrot, double polphi, double pollam,
result : longitude in the geographical system
*/
double zarg1, zarg2;
double zgam;
double result = 0;
double zsinpol = sin(DEG2RAD*polphi);
double zcospol = cos(DEG2RAD*polphi);
......@@ -32,8 +32,10 @@ double lamrot_to_lam(double phirot, double lamrot, double polphi, double pollam,
double zlamrot = DEG2RAD*lamrot;
if ( fabs(polgam) > 0 )
//X if ( polgam > 0 )
{
zgam = -DEG2RAD*polgam;
double zgam = -DEG2RAD*polgam;
//X double zgam = DEG2RAD*polgam;
zarg1 = sin(zlampol) *
(- zsinpol*cos(zphirot) * (cos(zlamrot)*cos(zgam) - sin(zlamrot)*sin(zgam))
+ zcospol*sin(zphirot))
......@@ -54,6 +56,7 @@ double lamrot_to_lam(double phirot, double lamrot, double polphi, double pollam,
sin(zlampol)* sin(zlamrot)*cos(zphirot);
}
double result = 0;
if ( fabs(zarg2) > 0 ) result = RAD2DEG*atan2(zarg1, zarg2);
if ( fabs(result) < 9.e-14 ) result = 0;
......@@ -64,6 +67,8 @@ double lamrot_to_lam(double phirot, double lamrot, double polphi, double pollam,
double phirot_to_phi(double phirot, double lamrot, double polphi, double polgam)
{
/*
Name of the original Fortran function: PHSTOPH
This function converts phi from one rotated system to phi in another
system. If the optional argument polgam is present, the other system
can also be a rotated one, where polgam is the angle between the two
......@@ -79,18 +84,19 @@ double phirot_to_phi(double phirot, double lamrot, double polphi, double polgam)
result : latitude in the geographical system
*/
double zarg;
double zgam;
double zsinpol = sin(DEG2RAD*polphi);
double zcospol = cos(DEG2RAD*polphi);
double zphirot = DEG2RAD*phirot;
double zphirot = DEG2RAD*phirot;
if ( lamrot > 180.0 ) lamrot -= 360.0;
double zlamrot = DEG2RAD*lamrot;
double zlamrot = DEG2RAD*lamrot;
if ( fabs(polgam) > 0 )
//X if ( polgam > 0 )
{
zgam = -DEG2RAD*polgam;
double zgam = -DEG2RAD*polgam;
//X double zgam = DEG2RAD*polgam;
zarg = zsinpol*sin(zphirot) +
zcospol*cos(zphirot)*(cos(zlamrot)*cos(zgam) - sin(zgam)*sin(zlamrot));
}
......@@ -104,6 +110,8 @@ static
double lam_to_lamrot(double phi, double rla, double polphi, double pollam)
{
/*
Name of the original Fortran function: RLSTORL
Umrechnung von rla (geo. System) auf rlas (rot. System)
phi : Breite im geographischen System (N>0)
......@@ -130,14 +138,17 @@ double lam_to_lamrot(double phi, double rla, double polphi, double pollam)
return RAD2DEG*atan2(zarg1,zarg2);
}
#ifdef TEST_GRID_ROT
static
double phi_to_phirot(double phi, double rla, double polphi, double pollam)
double phi_to_phirot(double phi, double lam, double polphi, double pollam)
{
/*
Name of the original Fortran function: PHTOPHS
Umrechnung von phi (geo. System) auf phis (rot. System)
phi : Breite im geographischen System (N>0)
rla : Laenge im geographischen System (E>0)
lam : Laenge im geographischen System (E>0)
polphi : Geographische Breite des Nordpols des rot. Systems
pollam : Geographische Laenge des Nordpols des rot. Systems
......@@ -147,29 +158,29 @@ double phi_to_phirot(double phi, double rla, double polphi, double pollam)
double zcospol = cos(DEG2RAD*polphi);
double zlampol = DEG2RAD*pollam;
double zphi = DEG2RAD*phi;
if ( rla > 180.0 ) rla -= 360.0;
double zrla = DEG2RAD*rla;
double zphi = DEG2RAD*phi;
if ( lam > 180.0 ) lam -= 360.0;
double zlam = DEG2RAD*lam;
double zarg = zcospol*cos(zphi)*cos(zrla-zlampol) + zsinpol*sin(zphi);
double zarg = zcospol*cos(zphi)*cos(zlam-zlampol) + zsinpol*sin(zphi);
return RAD2DEG*asin(zarg);
}
#endif
void usvs_to_uv(double us, double vs, double phi, double rla,
double polphi, double pollam, double *u, double *v)
{
/*
Umrechnen der windkomponente us, vs im rotierten sphaerischen
Umrechnen der windkomponenten us, vs im rotierten sphaerischen
system in die windkomponenten u, v, im geographischen system
us : 'zonaler wind im rotierten system
vs : 'merid. wind im rotierten system
phi : breite im geographischen system (n>0)
rla : laenge im geographischen system (e>0)
polphi : geographische breite des n-pols des rot. sys.
pollam : geographische laenge des n-pols des rot. sys.
phi : Breite im geographischen system (N>0)
rla : Laenge im geographischen system (E>0)
polphi : Geographische breite des Nordpols des rot. Systems
pollam : Geographische laenge des Nordpols des rot. Systems
u : zonaler wind im geographischen system
v : merid. wind im geographischen system
......@@ -178,6 +189,7 @@ void usvs_to_uv(double us, double vs, double phi, double rla,
double zpolphi = polphi*DEG2RAD;
double zpollam = pollam*DEG2RAD;
if ( rla < 0.0 ) rla += 360.0;
//X if ( rla < 0.0 ) rla += 360.0;
double zrla = rla *DEG2RAD;
double pollamd = pollam;
if ( pollamd < 0.0 ) pollamd += 360.0;
......@@ -194,7 +206,7 @@ void usvs_to_uv(double us, double vs, double phi, double rla,
zbeta = sign(zbeta, -(rla - (pollamd-180.0)));
*/
double zbeta = fabs(acos(zarg));
/* if ( -(rla - (pollamd-180.0)) < 0 ) zbeta = -zbeta; */
// if ( -(rla - (pollamd-180.0)) < 0 ) zbeta = -zbeta;
if ( (-(rla - (pollamd-180.0)) < 0) && (-(rla - (pollamd-180.0)) >= -180) ) zbeta = -zbeta;
/* us - wind transformieren */
......
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