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GRSConvert.f90
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GRSConvert.f90
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SUBROUTINE rnl_XYZd(rln,drln,dxyz)
implicit none
real*8::XYZ(3),rln(3),drln(3),dxyz(3),RAD
real*8::sinu,cosu,sinl,cosl,rr,dr,du,dl
!-----------------------------------------------------------------------
RAD=datan(1.d0)/45.d0;rr=rln(3) !令rr=1
sinu=dsin(rln(2)*RAD);cosu=dcos(rln(2)*RAD)
sinl=dsin(rln(3)*RAD);cosl=dcos(rln(3)*RAD)
dl=drln(1);du=drln(2);dr=drln(3)
dxyz(1)=dr*cosu*cosl-du*sinu*cosl-dl*sinl
dxyz(2)=dr*cosu*sinl-du*sinu*sinl+dl*cosl
dxyz(3)=dr*sinu+du*cosu
return
end
!
!********************************************************************************
!
SUBROUTINE BLH_XYZ(GRS,BLH,XYZ)
!输入BLH－纬度、经度(度)、大地高
implicit none
real*8::GRS(6),a,f,BLH(3),XYZ(3)
real*8 slat,clat,slon,clon,v,h,e2,RAD
!-----------------------------------------------------------------------
a=GRS(2); f=GRS(5) !1/f
e2=(2.d0-f)*f
h=BLH(3)
RAD=datan(1.d0)/45.d0
slat = dsin(BLH(1)*RAD)
clat = dcos(BLH(1)*RAD)
slon = dsin(BLH(2)*RAD)
clon = dcos(BLH(2)*RAD)
v = a / dsqrt(1.d0-e2*slat*slat)
XYZ(1) = (v+h) * clat * clon
XYZ(2) = (v+h) * clat * slon
XYZ(3) = (v*(1.d0-e2)+h) * slat
return
end
!
!**************************************************************************
!
SUBROUTINE BLH_RLAT(GRS,BLH,RLAT)
!2005年3月27日,章传银
IMPLICIT REAL*8(A-H,O-Z)
real*8 GRS(6),a,f,BLH(3),RLAT(3)
real*8 N,K,flat,RLATB
!----------------------------------------------------------
a=GRS(2); f=GRS(5) !1/f
AE=a
E2=(2.d0-f)*f
pi=datan(1.d0)*4.d0
RAD=datan(1.d0)/45.d0
FLAT=BLH(1)
FLON=BLH(2)
HT=BLH(3)
FLATR=FLAT*RAD
FLONR=FLON*RAD
T1=DSIN(FLATR)**2
N=AE/DSQRT(1.d0-E2*T1)
T2=(N+HT)*DCOS(FLATR)
X=T2*DCOS(FLONR)
Y=T2*DSIN(FLONR)
Z=(N*(1.d0-E2)+HT)*DSIN(FLATR)
N=AE/DSQRT(1.d0-E2*T1)
! COMPUTE THE GEOCENTRIC RADIUS
RE=DSQRT(X**2+Y**2+Z**2)
! COMPUTE THE GEOCENTRIC LATITUDE
RLATB=DATAN(Z/DSQRT(X**2+Y**2))
! COMPUTE NORMAL GRAVITY:UNITS ARE M/SEC**2
! GR=GEQT*(1.+K*T1)/DSQRT(1.-E2*T1)
RLAT(1)=RE
RLAT(2)=RLATB/RAD
RLAT(3)=FLON
RETURN
END
!
!*********************************************************************** xyz2ell
!
subroutine XYZ_BLH(GRS,XYZ,BLH)
implicit none
real*8 GRS(6),a,f,XYZ(3),BLH(3)
real*8 ae, e2, lat, lon, h, x, y, z
real*8 pi, dlat, dh, lat0, h0, elat, eh, v, p
data elat/1.d-12/, eh/1.d-5/
!-----------------------------------------------------------------------
a=GRS(2); f=GRS(5) !1/f
pi=datan(1.d0)*4.d0
ae=a
e2=(2.d0-f)*f
x=XYZ(1)
y=XYZ(2)
z=XYZ(3)
p = sqrt(x*x + y*y)
lat = datan2(z, p/(1.d0-e2))
h = 0.d0
! Iterate until height and latitude converge
10 continue
lat0 = lat
h0 = h
v = ae / sqrt( 1.d0-e2*sin(lat)*sin(lat) )
h = p / cos(lat) - v
lat = atan2( z, p*(1.d0-e2*v/(v+h)) )
dlat = abs(lat - lat0)
dh = abs(h - h0)
if (dlat.gt.elat .or. dh.gt.eh) goto 10
! Compute longitude
lon = datan2(y,x)
lon=dmod(lon,2.d0*pi)
if (lon.lt.0.d0) lon = lon + 2.d0*pi
lat=lat+pi/2.d0
lat=dmod(lat,pi)
lat=lat-pi/2.d0
BLH(1)=lat*180.d0/pi
BLH(2)=lon*180.d0/pi
BLH(3)=h
return
end
!
!********************************************************************************
!
SUBROUTINE RLAT_XYZ(RLAT,XYZ)
implicit none
real*8::XYZ(3),RLAT(3),RAD
RAD=datan(1.d0)/45.d0
XYZ(1)=dcos(RLAT(2)*RAD)*dcos(RLAT(3)*RAD)
XYZ(2)=dcos(RLAT(2)*RAD)*dsin(RLAT(3)*RAD)
XYZ(3)=dsin(RLAT(2)*RAD)
XYZ=XYZ*RLAT(1)
return
end
!
!********************************************************************************
!
SUBROUTINE XYZ_RLAT(GRS,XYZ,RLAT)
implicit none
real*8::GRS(6),XYZ(3),BLH(3),RLAT(3)
call XYZ_BLH(GRS,XYZ,BLH)
call BLH_RLAT(GRS,BLH,RLAT)
return
end
!
!********************************************************************************
!
SUBROUTINE RLAT_BLH(GRS,RLAT,BLH)
implicit none
real*8::GRS(6),XYZ(3),BLH(3),RLAT(3)
call RLAT_XYZ(RLAT,XYZ)
call XYZ_BLH(GRS,XYZ,BLH)
return
end