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ip_rot_equid_cylind_grid_mod: make init_grib2 resemble init_grib1 #240

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ip_rot_equid_cylind_grid_mod: make init_grib2 resemble init_grib1 #240

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39 changes: 29 additions & 10 deletions src/ip_rot_equid_cylind_grid_mod.F90
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Original file line number Diff line number Diff line change
Expand Up @@ -143,6 +143,7 @@ subroutine init_grib2(self, g2_desc)
real(kd) :: rlat1, rlon1, rlat0, rlat2, rlon2, nbd, ebd
integer :: iscale
integer :: i_offset_odd, i_offset_even, j_offset
real(kd) :: hs, hs2, slat1, slat2, slatr, clon1, clon2, clat1, clat2, clatr, clonr, rlonr, rlatr

associate(igdtmpl => g2_desc%gdt_tmpl, igdtlen => g2_desc%gdt_len)

Expand All @@ -157,28 +158,46 @@ subroutine init_grib2(self, g2_desc)

RLAT1=FLOAT(IGDTMPL(12))/FLOAT(ISCALE)
RLON1=FLOAT(IGDTMPL(13))/FLOAT(ISCALE)
RLAT0=FLOAT(IGDTMPL(20))/FLOAT(ISCALE)
RLAT0=RLAT0+90.0_KD
RLAT0=FLOAT(IGDTMPL(15))/FLOAT(ISCALE)
! RLAT0=RLAT0+90.0_KD

self%RLON0=FLOAT(IGDTMPL(21))/FLOAT(ISCALE)
self%RLON0=FLOAT(IGDTMPL(16))/FLOAT(ISCALE)

RLAT2=FLOAT(IGDTMPL(15))/FLOAT(ISCALE)
RLON2=FLOAT(IGDTMPL(16))/FLOAT(ISCALE)
RLAT2=FLOAT(IGDTMPL(20))/FLOAT(ISCALE)
RLON2=FLOAT(IGDTMPL(21))/FLOAT(ISCALE)

self%IROT=MOD(IGDTMPL(14)/8,2)
self%IM=IGDTMPL(8)
self%JM=IGDTMPL(9)

SLAT1=SIN(RLAT1/DPR)
CLAT1=COS(RLAT1/DPR)

self%SLAT0=SIN(RLAT0/DPR)
self%CLAT0=COS(RLAT0/DPR)

self%WBD=RLON1
IF (self%WBD > 180.0) self%WBD = self%WBD - 360.0
self%SBD=RLAT1
HS=SIGN(1._KD,MOD(RLON1-self%RLON0+180+3600,360._KD)-180)

NBD=RLAT2
EBD=RLON2
CLON1=COS((RLON1-self%RLON0)/DPR)
SLATR=self%CLAT0*SLAT1-self%SLAT0*CLAT1*CLON1
CLATR=SQRT(1-SLATR**2)
CLONR=(self%CLAT0*CLAT1*CLON1+self%SLAT0*SLAT1)/CLATR
RLATR=DPR*ASIN(SLATR)
RLONR=HS*DPR*ACOS(CLONR)

self%WBD=RLONR
IF (self%WBD > 180.0) self%WBD = self%WBD - 360.0
self%SBD=RLATR

SLAT2=SIN(RLAT2/DPR)
CLAT2=COS(RLAT2/DPR)
HS2=SIGN(1._KD,MOD(RLON2-self%RLON0+180+3600,360._KD)-180)
CLON2=COS((RLON2-self%RLON0)/DPR)
SLATR=self%CLAT0*SLAT2-self%SLAT0*CLAT2*CLON2
CLATR=SQRT(1-SLATR**2)
CLONR=(self%CLAT0*CLAT2*CLON2+self%SLAT0*SLAT2)/CLATR
NBD=DPR*ASIN(SLATR)
EBD=HS2*DPR*ACOS(CLONR)
self%DLATS=(NBD-self%SBD)/FLOAT(self%JM-1)
self%DLONS=(EBD-self%WBD)/FLOAT(self%IM-1)

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