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himawari_nav.f90
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!******************************************************************************%
! *
! * Copyright (C) 2016 Simon Proud <[email protected]>
! *
! * This source code is licensed under the GNU General Public License (GPL),
! * Version 3. See the file COPYING for more details.
! *
! ******************************************************************************/
module himawari_navigation
use himawari
use iso_c_binding
use himawari_headerinfo
implicit none
public :: AHI_Pix2Geo, \
AHI_DefaultNav, \
AHI_Calctime, \
AHI_Solpos
interface
integer(c_int) function get_sza_saa(year,month,day,hour,minute,lat,lon,sza,saa) bind(C, name = 'get_sza_saa')
use iso_c_binding
implicit none
integer(c_int), intent(in), value :: year
integer(c_int), intent(in), value :: month
integer(c_int), intent(in), value :: day
integer(c_int), intent(in), value :: hour
integer(c_int), intent(in), value :: minute
real(c_float), intent(in), value :: lat
real(c_float), intent(in), value :: lon
real(c_float), intent(out) :: sza
real(c_float), intent(out) :: saa
end function get_sza_saa
end interface
contains
integer function AHI_Solpos(year,month,day,hour,minute,lat,lon,sza,saa) result(status)
implicit none
integer, intent(in), value :: year
integer, intent(in), value :: month
integer, intent(in), value :: day
integer, intent(in), value :: hour
integer, intent(in), value :: minute
real(kind=ahi_sreal), intent(in), value :: lat
real(kind=ahi_sreal), intent(in), value :: lon
real(kind=ahi_sreal), intent(out) :: sza
real(kind=ahi_sreal), intent(out) :: saa
status = get_sza_saa(year,month,day,hour,minute,lat,lon,sza,saa)
if (status .ne. 0) then
write(6, *) 'ERROR: get_sza_saa()'
return
end if
if (saa .gt. 360.0) then
saa = him_sreal_fill_value
endif
if (saa .lt. 0.0) then
saa = him_sreal_fill_value
endif
sza = abs(sza)
if (sza .gt. 180.0) then
sza = him_sreal_fill_value
endif
if (sza .lt. -180.0) then
sza = him_sreal_fill_value
endif
status = HIMAWARI_SUCCESS
return
end function AHI_Solpos
integer function AHI_DefaultNav(ahi_navi,him_nav,verbose) result(status)
type(himawari_t_navdata), intent(inout) :: ahi_navi
type(himawari_t_Proj_Info), intent(in) :: him_nav
logical, intent(in) :: verbose
ahi_navi%subLon = him_nav%subLon
ahi_navi%cfac = him_nav%cfac / HIMAWARI_DEGTORAD
ahi_navi%lfac = him_nav%lfac / HIMAWARI_DEGTORAD
ahi_navi%coff = him_nav%coff
ahi_navi%loff = him_nav%loff
ahi_navi%satDis = him_nav%satDis
ahi_navi%eqtrRadius = him_nav%eqtrRadius
ahi_navi%polrRadius = him_nav%polrRadius
ahi_navi%projParam1 = him_nav%projParam1
ahi_navi%projParam2 = him_nav%projParam2
ahi_navi%projParam3 = him_nav%projParam3
ahi_navi%projParamSd = him_nav%projParamSd
status = HIMAWARI_SUCCESS
return
end function AHI_DefaultNav
integer function AHI_Pix2Geo(ahi_main,verbose) result(status)
type(himawari_t_struct), intent(inout) :: ahi_main
logical, intent(in) :: verbose
! real :: Sd,Sn,S1,S2,S3,Sxy
integer :: c1,l1
integer :: xsize
integer :: ysize
real(kind=ahi_dreal),dimension(:,:),allocatable :: c,l,x,y
real(kind=ahi_dreal),dimension(:,:),allocatable :: Sd,Sn,S1,S2,S3,Sxy
xsize = HIMAWARI_IR_NLINES
ysize = HIMAWARI_IR_NCOLS
allocate(c(xsize,ysize))
allocate(l(xsize,ysize))
allocate(x(xsize,ysize))
allocate(y(xsize,ysize))
allocate(Sd(xsize,ysize))
allocate(sn(xsize,ysize))
allocate(s1(xsize,ysize))
allocate(s2(xsize,ysize))
allocate(s3(xsize,ysize))
allocate(sxy(xsize,ysize))
ahi_main%ahi_data%lat = him_sreal_fill_value
ahi_main%ahi_data%lon = him_sreal_fill_value
do c1=1,HIMAWARI_IR_NLINES
do l1=1,HIMAWARI_IR_NCOLS
c(c1,l1)=dble(c1)
l(c1,l1)=dble(l1)
enddo
enddo
x = ( c - ahi_main%ahi_navdata%coff) / ( HIMAWARI_SCLUNIT * ahi_main%ahi_navdata%cfac)
y = ( l - ahi_main%ahi_navdata%loff) / ( HIMAWARI_SCLUNIT * ahi_main%ahi_navdata%lfac)
sd = (ahi_main%ahi_navdata%satDis * cos(x) * cos(y)) * (ahi_main%ahi_navdata%satDis * cos(x) * cos(y)) -&
(cos(y) * cos(y) + ahi_main%ahi_navdata%projParam3 * sin(y) * sin(y)) *&
ahi_main%ahi_navdata%projParamSd
sd = sqrt(sd)
sn = (ahi_main%ahi_navdata%satDis * cos(x) * cos(y) -sd) / (cos(y) * cos(y) +&
ahi_main%ahi_navdata%projParam3 * sin(y) * sin(y))
s1 = ahi_main%ahi_navdata%satDis - (sn * cos(x) * cos(y))
s2 = sn * sin(x) * cos(y)
s3 =-sn * sin(y)
sxy=sqrt( s1 * s1 + s2 * s2)
ahi_main%ahi_data%lon = sngl(HIMAWARI_RADTODEG * atan(s2/s1) + ahi_main%ahi_navdata%subLon)
ahi_main%ahi_data%lat = sngl(atan(ahi_main%ahi_navdata%projParam3 * s3 / sxy) * HIMAWARI_RADTODEG)
where (ahi_main%ahi_data%lon .gt. 180.0)
ahi_main%ahi_data%lon = ahi_main%ahi_data%lon-360.0
end where
where (ahi_main%ahi_data%lon .lt. -180.0)
ahi_main%ahi_data%lon = ahi_main%ahi_data%lon+360.0
end where
! ahi_main%ahi_data%lat = ahi_main%ahi_data%lat*-1
! stop
where (ahi_main%ahi_data%lon .gt. 180.0)
ahi_main%ahi_data%lon = him_sreal_fill_value
end where
where (ahi_main%ahi_data%lon .lt. -180.0)
ahi_main%ahi_data%lon = him_sreal_fill_value
end where
where (ahi_main%ahi_data%lat .gt. 90.0)
ahi_main%ahi_data%lat = him_sreal_fill_value
end where
where (ahi_main%ahi_data%lat .lt. -90.0)
ahi_main%ahi_data%lat = him_sreal_fill_value
end where
deallocate(x)
deallocate(y)
deallocate(c)
deallocate(l)
deallocate(sn)
deallocate(sd)
deallocate(s1)
deallocate(s2)
deallocate(s3)
deallocate(sxy)
status = HIMAWARI_SUCCESS
return
end function AHI_Pix2Geo
integer function AHI_Calctime(ahi_main,verbose) result(status)
use omp_lib
type(himawari_t_struct), intent(inout) :: ahi_main
logical, intent(in) :: verbose
integer :: year,month,day,hour,minu,yearp,monthp,retval
real(kind=ahi_dreal) :: a,b,c,d,jd,tfact
integer :: x,y
real(kind=ahi_dreal) :: start_jd,end_jd
integer :: iye,mon,idy,ihr,min,ifail
integer :: iyyy,jy,jm,igreg,ja,ijul
integer :: idint2,n_threads,tnr,i,t
real(kind=ahi_dreal) :: julian
real(kind=ahi_sreal) :: sza,saa
real(kind=ahi_sreal) :: sec
real (kind=ahi_sreal) :: doy
real(kind=ahi_sreal):: bob1,bob2
parameter (igreg=15+31*(10+12*1582))
sec=0
read(ahi_main%ahi_info%timeslot(1:4),'(i10)')iye
read(ahi_main%ahi_info%timeslot(5:6),'(i10)')mon
read(ahi_main%ahi_info%timeslot(7:8),'(i10)')idy
read(ahi_main%ahi_info%timeslot(9:10),'(i10)')ihr
read(ahi_main%ahi_info%timeslot(11:12),'(i10)')min
if(iye.eq.0.or. iye.lt.-4713) then
ifail=1
return
endif
if(iye.lt.0) then
iyyy=iye+1
else
iyyy=iye
endif
if(mon.gt.2) then
jy=iyyy
jm=mon+1
else
jy=iyyy-1
jm=mon+13
endif
ijul=idint(365.25d0*dble(jy))+idint(30.6001d0*dble(jm))+idy+1720995
if(idy+31*(mon+12*iyyy).ge.igreg) then
ja=idint(0.01d0*dble(jy))
ijul=ijul+2-ja+idint(0.25d0*dble(ja))
endif
julian=dble(ijul)+dble(ihr)/24.d0+dble(min)/1440.d0+dble(sec)/86400.d0-0.5d0
tfact = 10.0/(24.0*60.0)
do x=1,HIMAWARI_IR_NLINES
ahi_main%ahi_data%time(:,x)=julian+tfact*(x/dble(HIMAWARI_IR_NLINES))
enddo
#ifdef _OPENMP
!$omp parallel DO PRIVATE(i,x,y,sza,saa,tnr)
#endif
do y=1,HIMAWARI_IR_NCOLS
do x=1,HIMAWARI_IR_NLINES
retval = AHI_Solpos(iye,mon,idy,ihr,min,ahi_main%ahi_data%lat(x,y),ahi_main%ahi_data%lon(x,y),sza,saa)
ahi_main%ahi_data%sza(x,y)=sza
ahi_main%ahi_data%saa(x,y)=saa
enddo
enddo
#ifdef _OPENMP
!$omp end parallel do
#endif
status = HIMAWARI_SUCCESS
return
end function AHI_Calctime
integer function AHI_calc_satangs(ahi_main,verbose) result(status)
type(himawari_t_struct), intent(inout) :: ahi_main
logical, intent(in) :: verbose
real(kind=ahi_dreal),dimension(:,:),allocatable :: N
real(kind=ahi_dreal),dimension(:,:),allocatable :: x,y,z
real(kind=ahi_dreal),dimension(:,:),allocatable :: cos_lat,sin_lat,cos_lon,sin_lon
real(kind=ahi_dreal),dimension(:,:),allocatable :: qv1,qv2,qv3
real(kind=ahi_dreal),dimension(:,:),allocatable :: u1,u2,u3
real(kind=ahi_dreal) :: e2,a,b
allocate(N(HIMAWARI_IR_NLINES,HIMAWARI_IR_NCOLS))
allocate(x(HIMAWARI_IR_NLINES,HIMAWARI_IR_NCOLS))
allocate(y(HIMAWARI_IR_NLINES,HIMAWARI_IR_NCOLS))
allocate(z(HIMAWARI_IR_NLINES,HIMAWARI_IR_NCOLS))
allocate(qv1(HIMAWARI_IR_NLINES,HIMAWARI_IR_NCOLS))
allocate(qv2(HIMAWARI_IR_NLINES,HIMAWARI_IR_NCOLS))
allocate(qv3(HIMAWARI_IR_NLINES,HIMAWARI_IR_NCOLS))
allocate(u1(HIMAWARI_IR_NLINES,HIMAWARI_IR_NCOLS))
allocate(u2(HIMAWARI_IR_NLINES,HIMAWARI_IR_NCOLS))
allocate(u3(HIMAWARI_IR_NLINES,HIMAWARI_IR_NCOLS))
allocate(cos_lat(HIMAWARI_IR_NLINES,HIMAWARI_IR_NCOLS))
allocate(sin_lat(HIMAWARI_IR_NLINES,HIMAWARI_IR_NCOLS))
allocate(cos_lon(HIMAWARI_IR_NLINES,HIMAWARI_IR_NCOLS))
allocate(sin_lon(HIMAWARI_IR_NLINES,HIMAWARI_IR_NCOLS))
a = ahi_main%ahi_navdata%eqtrRadius
b = ahi_main%ahi_navdata%polrRadius
cos_lat = cos(ahi_main%ahi_data%lat * HIMAWARI_DEGTORAD)
sin_lat = sin(ahi_main%ahi_data%lat * HIMAWARI_DEGTORAD)
cos_lon = cos(ahi_main%ahi_data%lon * HIMAWARI_DEGTORAD)
sin_lon = sin(ahi_main%ahi_data%lon * HIMAWARI_DEGTORAD)
e2 = 1. - (b * b) / (a * a)
N = a / sqrt(1. - e2 * sin_lat * sin_lat)
x = N * cos_lat * cos_lon;
y = N * cos_lat * sin_lon;
z = ((b * b) / (a * a) * N) * sin_lat;
qv1 = ahi_main%ahi_navdata%satdis * cos(ahi_main%ahi_navdata%subLon * HIMAWARI_DEGTORAD)
qv2 = ahi_main%ahi_navdata%satdis * sin(ahi_main%ahi_navdata%subLon * HIMAWARI_DEGTORAD)
qv3 = 0
qv1 = qv1 - x
qv2 = qv2 - y
qv3 = qv3 - z
!s,e,z
u1 = (sin_lat * cos_lon * qv1) + ( sin_lat * sin_lon * qv2) - (cos_lat * qv3)
u2 = (-sin_lon * qv1) + ( cos_lon * qv2)
u3 = (cos_lat * cos_lon * qv1) + ( cos_lat * sin_lon * qv2) + (sin_lat * qv3)
ahi_main%ahi_data%vza = acos(u3 / sqrt(u1*u1 + u2*u2 + u3*u3)) * HIMAWARI_RADTODEG
ahi_main%ahi_data%vaa = atan2(-u2, u1) * HIMAWARI_RADTODEG
where (ahi_main%ahi_data%vaa .lt. 0)
ahi_main%ahi_data%vaa = ahi_main%ahi_data%vaa+360.0
end where
where (ahi_main%ahi_data%vaa .gt. 360)
ahi_main%ahi_data%vaa = him_sreal_fill_value
end where
where (ahi_main%ahi_data%vaa .lt. 0)
ahi_main%ahi_data%vaa = him_sreal_fill_value
end where
where (ahi_main%ahi_data%vza .lt. 0)
ahi_main%ahi_data%vza = him_sreal_fill_value
end where
where (ahi_main%ahi_data%vza .gt. 180)
ahi_main%ahi_data%vza = him_sreal_fill_value
end where
deallocate(N)
deallocate(x)
deallocate(y)
deallocate(z)
deallocate(qv1)
deallocate(qv2)
deallocate(qv3)
deallocate(u1)
deallocate(u2)
deallocate(u3)
deallocate(cos_lat)
deallocate(sin_lat)
deallocate(cos_lon)
deallocate(sin_lon)
status = HIMAWARI_SUCCESS
return
end function AHI_calc_satangs
end module himawari_navigation