[2759] | 1 | subroutine gdt2gds(igds,igdstmpl,idefnum,ideflist,kgds, |
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| 2 | & igrid,iret) |
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| 3 | C$$$ SUBPROGRAM DOCUMENTATION BLOCK |
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| 4 | C . . . . |
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| 5 | C SUBPROGRAM: gdt2gds |
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| 6 | C PRGMMR: Gilbert ORG: W/NP11 DATE: 2003-06-17 |
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| 7 | C |
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| 8 | C ABSTRACT: This routine converts grid information from a GRIB2 |
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| 9 | C Grid Description Section as well as its |
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| 10 | C Grid Definition Template to GRIB1 GDS info. In addition, |
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| 11 | C a check is made to determine if the grid is an NCEP |
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| 12 | C predefined grid. |
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| 13 | C |
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| 14 | C PROGRAM HISTORY LOG: |
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| 15 | C 2003-06-17 Gilbert |
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| 16 | C 2004-04-27 Gilbert - Added support for gaussian grids. |
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| 17 | C |
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| 18 | C USAGE: CALL gdt2gds(igds,igdstmpl,idefnum,ideflist,kgds,igrid,iret) |
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| 19 | C INPUT ARGUMENT LIST: |
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| 20 | C igds() - Contains information read from the appropriate GRIB Grid |
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| 21 | C Definition Section 3 for the field being returned. |
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| 22 | C Must be dimensioned >= 5. |
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| 23 | C igds(1)=Source of grid definition (see Code Table 3.0) |
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| 24 | C igds(2)=Number of grid points in the defined grid. |
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| 25 | C igds(3)=Number of octets needed for each |
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| 26 | C additional grid points definition. |
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| 27 | C Used to define number of |
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| 28 | C points in each row ( or column ) for |
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| 29 | C non-regular grids. |
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| 30 | C = 0, if using regular grid. |
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| 31 | C igds(4)=Interpretation of list for optional points |
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| 32 | C definition. (Code Table 3.11) |
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| 33 | C igds(5)=Grid Definition Template Number (Code Table 3.1) |
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| 34 | C igdstmpl() - Grid Definition Template values for GDT 3.igds(5) |
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| 35 | C idefnum - The number of entries in array ideflist. |
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| 36 | C i.e. number of rows ( or columns ) |
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| 37 | C for which optional grid points are defined. |
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| 38 | C ideflist() - Optional integer array containing |
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| 39 | C the number of grid points contained in each row (or column). |
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| 40 | C |
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| 41 | C OUTPUT ARGUMENT LIST: (INCLUDING WORK ARRAYS) |
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| 42 | C kgds() - GRIB1 GDS as described in w3fi63 format. |
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| 43 | C igrid - NCEP predifined GRIB1 grid number |
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| 44 | C set to 255, if not NCEP grid |
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| 45 | C iret - Error return value: |
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| 46 | C 0 = Successful |
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| 47 | C 1 = Unrecognized GRIB2 GDT number 3.igds(5) |
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| 48 | C |
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| 49 | C REMARKS: LIST CAVEATS, OTHER HELPFUL HINTS OR INFORMATION |
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| 50 | C |
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| 51 | C ATTRIBUTES: |
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| 52 | C LANGUAGE: INDICATE EXTENSIONS, COMPILER OPTIONS |
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| 53 | C MACHINE: IBM SP |
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| 54 | C |
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| 55 | C$$$ |
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| 56 | ! |
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| 57 | integer,intent(in) :: idefnum |
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| 58 | integer,intent(in) :: igds(*),igdstmpl(*),ideflist(*) |
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| 59 | integer,intent(out) :: kgds(*),igrid,iret |
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| 60 | |
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| 61 | integer :: kgds72(200),kgds71(200),idum(200),jdum(200) |
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| 62 | |
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| 63 | iret=0 |
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| 64 | if (igds(5).eq.0) then ! Lat/Lon grid |
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| 65 | kgds(1)=0 |
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| 66 | kgds(2)=igdstmpl(8) ! Ni |
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| 67 | kgds(3)=igdstmpl(9) ! Nj |
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| 68 | kgds(4)=igdstmpl(12)/1000 ! Lat of 1st grid point |
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| 69 | kgds(5)=igdstmpl(13)/1000 ! Long of 1st grid point |
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| 70 | kgds(6)=0 ! resolution and component flags |
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| 71 | if (igdstmpl(1)==2 ) kgds(6)=64 |
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| 72 | if ( btest(igdstmpl(14),4).OR.btest(igdstmpl(14),5) ) |
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| 73 | & kgds(6)=kgds(6)+128 |
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| 74 | if ( btest(igdstmpl(14),3) ) kgds(6)=kgds(6)+8 |
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| 75 | kgds(7)=igdstmpl(15)/1000 ! Lat of last grid point |
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| 76 | kgds(8)=igdstmpl(16)/1000 ! Long of last grid point |
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| 77 | kgds(9)=igdstmpl(17)/1000 ! Di |
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| 78 | kgds(10)=igdstmpl(18)/1000 ! Dj |
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| 79 | kgds(11)=igdstmpl(19) ! Scanning mode |
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| 80 | kgds(12)=0 |
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| 81 | kgds(13)=0 |
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| 82 | kgds(14)=0 |
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| 83 | kgds(15)=0 |
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| 84 | kgds(16)=0 |
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| 85 | kgds(17)=0 |
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| 86 | kgds(18)=0 |
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| 87 | kgds(19)=0 |
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| 88 | kgds(20)=255 |
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| 89 | kgds(21)=0 |
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| 90 | kgds(22)=0 |
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| 91 | ! |
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| 92 | ! Process irreg grid stuff, if necessary |
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| 93 | ! |
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| 94 | if ( idefnum.ne.0 ) then |
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| 95 | if ( igdstmpl(8).eq.-1 ) then |
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| 96 | kgds(2)=65535 |
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| 97 | kgds(9)=65535 |
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| 98 | endif |
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| 99 | if ( igdstmpl(9).eq.-1 ) then |
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| 100 | kgds(3)=65535 |
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| 101 | kgds(10)=65535 |
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| 102 | endif |
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| 103 | kgds(19)=0 |
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| 104 | kgds(20)=33 |
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| 105 | if ( kgds(1).eq.1.OR.kgds(1).eq.3 ) kgds(20)=43 |
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| 106 | kgds(21)=igds(2) ! num of grid points |
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| 107 | do j=1,idefnum |
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| 108 | kgds(21+j)=ideflist(j) |
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| 109 | enddo |
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| 110 | endif |
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| 111 | elseif (igds(5).eq.10) then ! Mercator grid |
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| 112 | kgds(1)=1 ! Grid Definition Template number |
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| 113 | kgds(2)=igdstmpl(8) ! Ni |
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| 114 | kgds(3)=igdstmpl(9) ! Nj |
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| 115 | kgds(4)=igdstmpl(10)/1000 ! Lat of 1st grid point |
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| 116 | kgds(5)=igdstmpl(11)/1000 ! Long of 1st grid point |
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| 117 | kgds(6)=0 ! resolution and component flags |
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| 118 | if (igdstmpl(1)==2 ) kgds(6)=64 |
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| 119 | if ( btest(igdstmpl(12),4).OR.btest(igdstmpl(12),5) ) |
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| 120 | & kgds(6)=kgds(6)+128 |
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| 121 | if ( btest(igdstmpl(12),3) ) kgds(6)=kgds(6)+8 |
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| 122 | kgds(7)=igdstmpl(14)/1000 ! Lat of last grid point |
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| 123 | kgds(8)=igdstmpl(15)/1000 ! Long of last grid point |
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| 124 | kgds(9)=igdstmpl(13)/1000 ! Lat intersects earth |
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| 125 | kgds(10)=0 |
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| 126 | kgds(11)=igdstmpl(16) ! Scanning mode |
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| 127 | kgds(12)=igdstmpl(18)/1000 ! Di |
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| 128 | kgds(13)=igdstmpl(19)/1000 ! Dj |
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| 129 | kgds(14)=0 |
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| 130 | kgds(15)=0 |
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| 131 | kgds(16)=0 |
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| 132 | kgds(17)=0 |
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| 133 | kgds(18)=0 |
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| 134 | kgds(19)=0 |
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| 135 | kgds(20)=255 |
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| 136 | kgds(21)=0 |
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| 137 | kgds(22)=0 |
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| 138 | elseif (igds(5).eq.30) then ! Lambert Conformal Grid |
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| 139 | kgds(1)=3 |
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| 140 | kgds(2)=igdstmpl(8) ! Nx |
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| 141 | kgds(3)=igdstmpl(9) ! Ny |
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| 142 | kgds(4)=igdstmpl(10)/1000 ! Lat of 1st grid point |
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| 143 | kgds(5)=igdstmpl(11)/1000 ! Long of 1st grid point |
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| 144 | kgds(6)=0 ! resolution and component flags |
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| 145 | if (igdstmpl(1)==2 ) kgds(6)=64 |
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| 146 | if ( btest(igdstmpl(12),4).OR.btest(igdstmpl(12),5) ) |
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| 147 | & kgds(6)=kgds(6)+128 |
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| 148 | if ( btest(igdstmpl(12),3) ) kgds(6)=kgds(6)+8 |
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| 149 | kgds(7)=igdstmpl(14)/1000 ! Lon of orientation |
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| 150 | kgds(8)=igdstmpl(15)/1000 ! Dx |
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| 151 | kgds(9)=igdstmpl(16)/1000 ! Dy |
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| 152 | kgds(10)=igdstmpl(17) ! Projection Center Flag |
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| 153 | kgds(11)=igdstmpl(18) ! Scanning mode |
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| 154 | kgds(12)=igdstmpl(19)/1000 ! Lat in 1 |
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| 155 | kgds(13)=igdstmpl(20)/1000 ! Lat in 2 |
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| 156 | kgds(14)=igdstmpl(21)/1000 ! Lat of S. Pole of projection |
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| 157 | kgds(15)=igdstmpl(22)/1000 ! Lon of S. Pole of projection |
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| 158 | kgds(16)=0 |
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| 159 | kgds(17)=0 |
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| 160 | kgds(18)=0 |
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| 161 | kgds(19)=0 |
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| 162 | kgds(20)=255 |
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| 163 | kgds(21)=0 |
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| 164 | kgds(22)=0 |
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| 165 | elseif (igds(5).eq.40) then ! Gaussian Lat/Lon grid |
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| 166 | kgds(1)=4 |
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| 167 | kgds(2)=igdstmpl(8) ! Ni |
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| 168 | kgds(3)=igdstmpl(9) ! Nj |
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| 169 | kgds(4)=igdstmpl(12)/1000 ! Lat of 1st grid point |
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| 170 | kgds(5)=igdstmpl(13)/1000 ! Long of 1st grid point |
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| 171 | kgds(6)=0 ! resolution and component flags |
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| 172 | if (igdstmpl(1)==2 ) kgds(6)=64 |
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| 173 | if ( btest(igdstmpl(14),4).OR.btest(igdstmpl(14),5) ) |
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| 174 | & kgds(6)=kgds(6)+128 |
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| 175 | if ( btest(igdstmpl(14),3) ) kgds(6)=kgds(6)+8 |
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| 176 | kgds(7)=igdstmpl(15)/1000 ! Lat of last grid point |
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| 177 | kgds(8)=igdstmpl(16)/1000 ! Long of last grid point |
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| 178 | kgds(9)=igdstmpl(17)/1000 ! Di |
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| 179 | kgds(10)=igdstmpl(18) ! N - Number of parallels |
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| 180 | kgds(11)=igdstmpl(19) ! Scanning mode |
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| 181 | kgds(12)=0 |
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| 182 | kgds(13)=0 |
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| 183 | kgds(14)=0 |
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| 184 | kgds(15)=0 |
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| 185 | kgds(16)=0 |
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| 186 | kgds(17)=0 |
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| 187 | kgds(18)=0 |
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| 188 | kgds(19)=0 |
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| 189 | kgds(20)=255 |
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| 190 | kgds(21)=0 |
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| 191 | kgds(22)=0 |
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| 192 | elseif (igds(5).eq.20) then ! Polar Stereographic Grid |
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| 193 | kgds(1)=5 |
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| 194 | kgds(2)=igdstmpl(8) ! Nx |
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| 195 | kgds(3)=igdstmpl(9) ! Ny |
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| 196 | kgds(4)=igdstmpl(10)/1000 ! Lat of 1st grid point |
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| 197 | kgds(5)=igdstmpl(11)/1000 ! Long of 1st grid point |
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| 198 | kgds(6)=0 ! resolution and component flags |
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| 199 | if (igdstmpl(1)==2 ) kgds(6)=64 |
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| 200 | if ( btest(igdstmpl(12),4).OR.btest(igdstmpl(12),5) ) |
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| 201 | & kgds(6)=kgds(6)+128 |
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| 202 | if ( btest(igdstmpl(12),3) ) kgds(6)=kgds(6)+8 |
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| 203 | kgds(7)=igdstmpl(14)/1000 ! Lon of orientation |
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| 204 | kgds(8)=igdstmpl(15)/1000 ! Dx |
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| 205 | kgds(9)=igdstmpl(16)/1000 ! Dy |
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| 206 | kgds(10)=igdstmpl(17) ! Projection Center Flag |
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| 207 | kgds(11)=igdstmpl(18) ! Scanning mode |
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| 208 | kgds(12)=0 |
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| 209 | kgds(13)=0 |
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| 210 | kgds(14)=0 |
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| 211 | kgds(15)=0 |
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| 212 | kgds(16)=0 |
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| 213 | kgds(17)=0 |
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| 214 | kgds(18)=0 |
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| 215 | kgds(19)=0 |
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| 216 | kgds(20)=255 |
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| 217 | kgds(21)=0 |
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| 218 | kgds(22)=0 |
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| 219 | else |
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| 220 | Print *,'gdt2gds: Unrecognized GRIB2 GDT = 3.',igds(5) |
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| 221 | iret=1 |
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| 222 | kgds(1:22)=0 |
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| 223 | return |
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| 224 | endif |
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| 225 | ! |
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| 226 | ! Can we determine NCEP grid number ? |
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| 227 | ! |
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| 228 | igrid=255 |
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| 229 | do j=254,1,-1 |
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| 230 | !do j=225,225 |
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| 231 | kgds71=0 |
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| 232 | kgds72=0 |
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| 233 | call w3fi71(j,kgds71,ierr) |
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| 234 | if ( ierr.ne.0 ) cycle |
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| 235 | ! convert W to E for longitudes |
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| 236 | if ( kgds71(3).eq.0 ) then ! lat/lon |
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| 237 | if ( kgds71(7).lt.0 ) kgds71(7)=360000+kgds71(7) |
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| 238 | if ( kgds71(10).lt.0 ) kgds71(10)=360000+kgds71(10) |
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| 239 | elseif ( kgds71(3).eq.1 ) then ! mercator |
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| 240 | if ( kgds71(7).lt.0 ) kgds71(7)=360000+kgds71(7) |
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| 241 | if ( kgds71(10).lt.0 ) kgds71(10)=360000+kgds71(10) |
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| 242 | elseif ( kgds71(3).eq.3 ) then ! lambert conformal |
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| 243 | if ( kgds71(7).lt.0 ) kgds71(7)=360000+kgds71(7) |
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| 244 | if ( kgds71(9).lt.0 ) kgds71(9)=360000+kgds71(9) |
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| 245 | if ( kgds71(18).lt.0 ) kgds71(18)=360000+kgds71(18) |
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| 246 | elseif ( kgds71(3).eq.4 ) then ! Guassian lat/lon |
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| 247 | if ( kgds71(7).lt.0 ) kgds71(7)=360000+kgds71(7) |
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| 248 | if ( kgds71(10).lt.0 ) kgds71(10)=360000+kgds71(10) |
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| 249 | elseif ( kgds71(3).eq.5 ) then ! polar stereographic |
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| 250 | if ( kgds71(7).lt.0 ) kgds71(7)=360000+kgds71(7) |
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| 251 | if ( kgds71(9).lt.0 ) kgds71(9)=360000+kgds71(9) |
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| 252 | endif |
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| 253 | call r63w72(idum,kgds,jdum,kgds72) |
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| 254 | if ( kgds72(3).eq.3 ) kgds72(14)=0 ! lambert conformal fix |
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| 255 | if ( kgds72(3).eq.1 ) kgds72(15:18)=0 ! mercator fix |
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| 256 | if ( kgds72(3).eq.5 ) kgds72(14:18)=0 ! polar str fix |
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| 257 | !print *,'SAGT71:',(kgds71(k),k=1,30) |
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| 258 | !print *,'SAGT72:',(kgds72(k),k=1,30) |
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| 259 | if ( all(kgds71.eq.kgds72) ) then |
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| 260 | igrid=j |
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| 261 | return |
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| 262 | endif |
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| 263 | enddo |
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| 264 | |
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| 265 | return |
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| 266 | end |
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