1 | SUBROUTINE get_grid (filename) |
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2 | !-------------------------------------------------------------- |
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3 | ! get the file grid |
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4 | !-------------------------------------------------------------- |
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5 | USE grid |
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6 | |
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7 | IMPLICIT NONE |
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8 | |
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9 | INCLUDE 'netcdf.inc' |
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10 | |
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11 | !-------------------------------------------------------------- |
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12 | ! ... Dummy arguments |
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13 | !-------------------------------------------------------------- |
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14 | CHARACTER(LEN=*), INTENT(in) :: filename |
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15 | |
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16 | !-------------------------------------------------------------- |
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17 | ! ... Local variables |
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18 | !-------------------------------------------------------------- |
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19 | INTEGER :: i, j |
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20 | INTEGER :: iret |
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21 | INTEGER :: error |
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22 | INTEGER :: ncid |
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23 | INTEGER :: varid |
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24 | INTEGER :: recid |
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25 | CHARACTER(LEN=NF_MAX_NAME) :: recname |
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26 | |
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27 | REAL :: d2r, pi |
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28 | |
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29 | pi = 4.*ATAN(1.) |
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30 | d2r = pi/180. |
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31 | |
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32 | PRINT *, 'Prepare grid coordinates for file ', filename(:LEN_TRIM(filename)), ' ...' |
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33 | |
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34 | ! ... Free space if needed |
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35 | IF ( ALLOCATED(lat) ) DEALLOCATE(lat) |
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36 | IF ( ALLOCATED(lon) ) DEALLOCATE(lon) |
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37 | IF ( ALLOCATED(lat_edge) ) DEALLOCATE(lat_edge) |
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38 | IF ( ALLOCATED(lon_edge) ) DEALLOCATE(lon_edge) |
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39 | IF ( ALLOCATED(area_in) ) DEALLOCATE(area_in) |
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40 | |
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41 | ! ... Open the file |
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42 | iret = nf_open(filename, 0, ncid) |
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43 | CALL check_err(iret) |
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44 | |
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45 | |
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46 | ! ... Get the vector lengths |
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47 | iret = nf_inq_dimid(ncid, 'latu', varid) |
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48 | CALL check_err(iret) |
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49 | iret = nf_inq_dimlen(ncid, varid, lat_len) |
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50 | CALL check_err(iret) |
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51 | |
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52 | iret = nf_inq_dimid(ncid, 'lonv', varid) |
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53 | CALL check_err(iret) |
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54 | iret = nf_inq_dimlen(ncid, varid, lon_len) |
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55 | CALL check_err(iret) |
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56 | |
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57 | ! ... Allocate grid variables |
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58 | ALLOCATE(lat(lat_len), STAT=error) |
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59 | IF (error /= 0) STOP 'Space requested not possible' |
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60 | ALLOCATE(lon(lon_len), STAT=error) |
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61 | IF (error /= 0) STOP 'Space requested not possible' |
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62 | |
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63 | ! ... Get the coordinates |
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64 | iret = nf_inq_varid(ncid, 'latu', varid) |
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65 | CALL check_err(iret) |
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66 | iret = nf_get_var_real(ncid, varid, lat) |
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67 | CALL check_err(iret) |
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68 | iret = nf_inq_varid(ncid, 'lonv', varid) |
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69 | CALL check_err(iret) |
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70 | iret = nf_get_var_real(ncid, varid, lon) |
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71 | CALL check_err(iret) |
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72 | |
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73 | ! ... Additional variables |
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74 | klon_init = (lat_len - 2) * (lon_len - 1) + 2 |
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75 | print*,'klon_init',klon_init |
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76 | |
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77 | |
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78 | ! ... Latitudes need to be reversed |
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79 | |
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80 | ALLOCATE(latbis(lat_len), STAT=error) |
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81 | IF (error /= 0) STOP 'Space requested not possible' |
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82 | |
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83 | latbis(1:lat_len) = lat(lat_len:1:-1) |
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84 | lat=latbis |
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85 | |
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86 | lat_edge_len = lat_len + 1 |
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87 | lon_edge_len = lon_len + 1 |
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88 | ALLOCATE(lat_edge(lat_edge_len), STAT=error) |
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89 | IF (error /= 0) STOP 'Space requested not possible' |
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90 | ALLOCATE(lon_edge(lon_edge_len), STAT=error) |
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91 | IF (error /= 0) STOP 'Space requested not possible' |
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92 | |
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93 | lon_edge (1) = -180. |
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94 | lon_edge (2) = -178.125 |
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95 | DO i = 3, lon_edge_len-1 |
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96 | lon_edge (i) = lon_edge (i-1) + 3.75 |
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97 | ENDDO |
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98 | lon_edge (lon_edge_len) = 180. |
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99 | |
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100 | lat_edge (1) = -90. |
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101 | lat_edge (2) = -88.75 |
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102 | DO i = 3, lat_edge_len-1 |
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103 | lat_edge (i) = lat_edge (i-1) + 2.5 |
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104 | ENDDO |
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105 | lat_edge (lat_edge_len) = 90. |
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106 | |
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107 | END SUBROUTINE get_grid |
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