1 | !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! |
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2 | ! |
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3 | ! This program creates a remapping grid file for a lat/lon grid. |
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4 | ! |
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5 | !----------------------------------------------------------------------- |
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6 | ! |
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7 | ! CVS:$Id: create_latlon.f,v 1.1 2000/04/19 22:05:58 pwjones Exp $ |
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8 | ! |
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9 | ! Copyright (c) 1997, 1998 the Regents of the University of |
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10 | ! California. |
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11 | ! |
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12 | ! Unless otherwise indicated, this software has been authored |
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13 | ! by an employee or employees of the University of California, |
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14 | ! operator of the Los Alamos National Laboratory under Contract |
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15 | ! No. W-7405-ENG-36 with the U.S. Department of Energy. The U.S. |
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16 | ! Government has rights to use, reproduce, and distribute this |
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17 | ! software. The public may copy and use this software without |
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18 | ! charge, provided that this Notice and any statement of authorship |
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19 | ! are reproduced on all copies. Neither the Government nor the |
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20 | ! University makes any warranty, express or implied, or assumes |
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21 | ! any liability or responsibility for the use of this software. |
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22 | ! |
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23 | !*********************************************************************** |
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24 | |
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25 | program create_latlon |
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26 | |
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27 | !----------------------------------------------------------------------- |
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28 | ! |
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29 | ! This file creates a remapping grid file for a Gaussian grid |
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30 | ! |
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31 | !----------------------------------------------------------------------- |
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32 | |
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33 | use kinds_mod |
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34 | use constants |
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35 | use iounits |
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36 | use netcdf_mod |
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37 | |
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38 | implicit none |
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39 | |
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40 | !----------------------------------------------------------------------- |
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41 | ! |
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42 | ! variables that describe the grid |
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43 | ! |
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44 | !----------------------------------------------------------------------- |
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45 | |
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46 | integer (kind=int_kind), parameter :: |
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47 | & nx = 360, ny = 180, |
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48 | & grid_size = nx*ny, |
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49 | & grid_rank = 2, |
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50 | & grid_corners = 4 |
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51 | |
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52 | character(char_len), parameter :: |
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53 | & grid_name = 'Lat/lon 1 degree Grid', |
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54 | & grid_file_out = 'll1deg_grid.nc' |
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55 | |
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56 | integer (kind=int_kind), dimension(grid_rank) :: |
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57 | & grid_dims |
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58 | |
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59 | !----------------------------------------------------------------------- |
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60 | ! |
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61 | ! grid coordinates and masks |
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62 | ! |
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63 | !----------------------------------------------------------------------- |
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64 | |
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65 | integer (kind=int_kind), dimension(grid_size) :: |
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66 | & grid_imask |
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67 | |
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68 | real (kind=dbl_kind), dimension(grid_size) :: |
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69 | & grid_center_lat, ! lat/lon coordinates for |
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70 | & grid_center_lon ! each grid center in degrees |
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71 | |
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72 | real (kind=dbl_kind), dimension(grid_corners,grid_size) :: |
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73 | & grid_corner_lat, ! lat/lon coordinates for |
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74 | & grid_corner_lon ! each grid corner in degrees |
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75 | |
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76 | !----------------------------------------------------------------------- |
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77 | ! |
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78 | ! other local variables |
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79 | ! |
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80 | !----------------------------------------------------------------------- |
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81 | |
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82 | integer (kind=int_kind) :: i, j, iunit, atm_add |
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83 | |
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84 | integer (kind=int_kind) :: |
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85 | & ncstat, ! general netCDF status variable |
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86 | & nc_grid_id, ! netCDF grid dataset id |
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87 | & nc_gridsize_id, ! netCDF grid size dim id |
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88 | & nc_gridcorn_id, ! netCDF grid corner dim id |
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89 | & nc_gridrank_id, ! netCDF grid rank dim id |
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90 | & nc_griddims_id, ! netCDF grid dimension size id |
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91 | & nc_grdcntrlat_id, ! netCDF grid center lat id |
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92 | & nc_grdcntrlon_id, ! netCDF grid center lon id |
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93 | & nc_grdimask_id, ! netCDF grid mask id |
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94 | & nc_grdcrnrlat_id, ! netCDF grid corner lat id |
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95 | & nc_grdcrnrlon_id ! netCDF grid corner lon id |
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96 | |
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97 | integer (kind=int_kind), dimension(2) :: |
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98 | & nc_dims2_id ! netCDF dim id array for 2-d arrays |
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99 | |
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100 | real (kind=dbl_kind) :: dlon, minlon, maxlon, centerlon, |
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101 | & dlat, minlat, maxlat, centerlat |
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102 | |
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103 | !----------------------------------------------------------------------- |
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104 | ! |
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105 | ! compute longitudes and latitudes of cell centers and corners. |
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106 | ! |
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107 | !----------------------------------------------------------------------- |
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108 | |
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109 | grid_dims(1) = nx |
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110 | grid_dims(2) = ny |
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111 | |
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112 | dlon = 360./nx |
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113 | dlat = 180./ny |
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114 | |
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115 | do j=1,ny |
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116 | |
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117 | minlat = -90._dbl_kind + (j-1)*dlat |
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118 | maxlat = -90._dbl_kind + j *dlat |
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119 | centerlat = minlat + half*dlat |
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120 | |
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121 | do i=1,nx |
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122 | centerlon = (i-1)*dlon |
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123 | minlon = centerlon - half*dlon |
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124 | maxlon = centerlon + half*dlon |
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125 | |
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126 | atm_add = (j-1)*nx + i |
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127 | |
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128 | grid_center_lat(atm_add ) = centerlat |
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129 | grid_corner_lat(1,atm_add) = minlat |
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130 | grid_corner_lat(2,atm_add) = minlat |
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131 | grid_corner_lat(3,atm_add) = maxlat |
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132 | grid_corner_lat(4,atm_add) = maxlat |
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133 | |
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134 | grid_center_lon(atm_add ) = centerlon |
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135 | grid_corner_lon(1,atm_add) = minlon |
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136 | grid_corner_lon(2,atm_add) = maxlon |
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137 | grid_corner_lon(3,atm_add) = maxlon |
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138 | grid_corner_lon(4,atm_add) = minlon |
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139 | end do |
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140 | end do |
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141 | |
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142 | !----------------------------------------------------------------------- |
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143 | ! |
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144 | ! define mask |
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145 | ! |
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146 | !----------------------------------------------------------------------- |
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147 | |
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148 | grid_imask = 1 |
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149 | |
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150 | !----------------------------------------------------------------------- |
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151 | ! |
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152 | ! set up attributes for netCDF file |
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153 | ! |
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154 | !----------------------------------------------------------------------- |
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155 | |
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156 | !*** |
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157 | !*** create netCDF dataset for this grid |
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158 | !*** |
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159 | |
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160 | ncstat = nf_create (grid_file_out, NF_CLOBBER, |
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161 | & nc_grid_id) |
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162 | call netcdf_error_handler(ncstat) |
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163 | |
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164 | ncstat = nf_put_att_text (nc_grid_id, NF_GLOBAL, 'title', |
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165 | & len_trim(grid_name), grid_name) |
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166 | call netcdf_error_handler(ncstat) |
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167 | |
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168 | !*** |
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169 | !*** define grid size dimension |
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170 | !*** |
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171 | |
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172 | ncstat = nf_def_dim (nc_grid_id, 'grid_size', grid_size, |
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173 | & nc_gridsize_id) |
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174 | call netcdf_error_handler(ncstat) |
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175 | |
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176 | !*** |
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177 | !*** define grid corner dimension |
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178 | !*** |
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179 | |
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180 | ncstat = nf_def_dim (nc_grid_id, 'grid_corners', grid_corners, |
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181 | & nc_gridcorn_id) |
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182 | call netcdf_error_handler(ncstat) |
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183 | |
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184 | !*** |
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185 | !*** define grid rank dimension |
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186 | !*** |
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187 | |
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188 | ncstat = nf_def_dim (nc_grid_id, 'grid_rank', grid_rank, |
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189 | & nc_gridrank_id) |
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190 | call netcdf_error_handler(ncstat) |
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191 | |
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192 | !*** |
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193 | !*** define grid dimension size array |
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194 | !*** |
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195 | |
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196 | ncstat = nf_def_var (nc_grid_id, 'grid_dims', NF_INT, |
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197 | & 1, nc_gridrank_id, nc_griddims_id) |
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198 | call netcdf_error_handler(ncstat) |
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199 | |
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200 | !*** |
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201 | !*** define grid center latitude array |
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202 | !*** |
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203 | |
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204 | ncstat = nf_def_var (nc_grid_id, 'grid_center_lat', NF_DOUBLE, |
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205 | & 1, nc_gridsize_id, nc_grdcntrlat_id) |
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206 | call netcdf_error_handler(ncstat) |
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207 | |
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208 | ncstat = nf_put_att_text (nc_grid_id, nc_grdcntrlat_id, 'units', |
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209 | & 7, 'degrees') |
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210 | call netcdf_error_handler(ncstat) |
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211 | |
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212 | !*** |
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213 | !*** define grid center longitude array |
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214 | !*** |
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215 | |
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216 | ncstat = nf_def_var (nc_grid_id, 'grid_center_lon', NF_DOUBLE, |
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217 | & 1, nc_gridsize_id, nc_grdcntrlon_id) |
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218 | call netcdf_error_handler(ncstat) |
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219 | |
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220 | ncstat = nf_put_att_text (nc_grid_id, nc_grdcntrlon_id, 'units', |
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221 | & 7, 'degrees') |
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222 | call netcdf_error_handler(ncstat) |
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223 | |
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224 | !*** |
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225 | !*** define grid mask |
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226 | !*** |
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227 | |
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228 | ncstat = nf_def_var (nc_grid_id, 'grid_imask', NF_INT, |
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229 | & 1, nc_gridsize_id, nc_grdimask_id) |
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230 | call netcdf_error_handler(ncstat) |
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231 | |
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232 | ncstat = nf_put_att_text (nc_grid_id, nc_grdimask_id, 'units', |
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233 | & 8, 'unitless') |
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234 | call netcdf_error_handler(ncstat) |
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235 | |
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236 | !*** |
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237 | !*** define grid corner latitude array |
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238 | !*** |
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239 | |
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240 | nc_dims2_id(1) = nc_gridcorn_id |
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241 | nc_dims2_id(2) = nc_gridsize_id |
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242 | |
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243 | ncstat = nf_def_var (nc_grid_id, 'grid_corner_lat', NF_DOUBLE, |
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244 | & 2, nc_dims2_id, nc_grdcrnrlat_id) |
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245 | call netcdf_error_handler(ncstat) |
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246 | |
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247 | ncstat = nf_put_att_text (nc_grid_id, nc_grdcrnrlat_id, 'units', |
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248 | & 7, 'degrees') |
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249 | call netcdf_error_handler(ncstat) |
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250 | |
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251 | !*** |
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252 | !*** define grid corner longitude array |
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253 | !*** |
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254 | |
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255 | ncstat = nf_def_var (nc_grid_id, 'grid_corner_lon', NF_DOUBLE, |
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256 | & 2, nc_dims2_id, nc_grdcrnrlon_id) |
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257 | call netcdf_error_handler(ncstat) |
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258 | |
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259 | ncstat = nf_put_att_text (nc_grid_id, nc_grdcrnrlon_id, 'units', |
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260 | & 7, 'degrees') |
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261 | call netcdf_error_handler(ncstat) |
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262 | |
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263 | !*** |
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264 | !*** end definition stage |
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265 | !*** |
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266 | |
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267 | ncstat = nf_enddef(nc_grid_id) |
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268 | call netcdf_error_handler(ncstat) |
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269 | |
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270 | !----------------------------------------------------------------------- |
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271 | ! |
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272 | ! write grid data |
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273 | ! |
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274 | !----------------------------------------------------------------------- |
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275 | |
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276 | ncstat = nf_put_var_int(nc_grid_id, nc_griddims_id, grid_dims) |
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277 | call netcdf_error_handler(ncstat) |
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278 | |
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279 | ncstat = nf_put_var_int(nc_grid_id, nc_grdimask_id, grid_imask) |
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280 | call netcdf_error_handler(ncstat) |
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281 | |
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282 | ncstat = nf_put_var_double(nc_grid_id, nc_grdcntrlat_id, |
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283 | & grid_center_lat) |
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284 | call netcdf_error_handler(ncstat) |
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285 | |
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286 | ncstat = nf_put_var_double(nc_grid_id, nc_grdcntrlon_id, |
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287 | & grid_center_lon) |
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288 | call netcdf_error_handler(ncstat) |
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289 | |
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290 | ncstat = nf_put_var_double(nc_grid_id, nc_grdcrnrlat_id, |
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291 | & grid_corner_lat) |
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292 | call netcdf_error_handler(ncstat) |
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293 | |
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294 | ncstat = nf_put_var_double(nc_grid_id, nc_grdcrnrlon_id, |
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295 | & grid_corner_lon) |
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296 | call netcdf_error_handler(ncstat) |
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297 | |
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298 | ncstat = nf_close(nc_grid_id) |
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299 | call netcdf_error_handler(ncstat) |
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300 | |
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301 | !----------------------------------------------------------------------- |
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302 | |
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303 | end program create_latlon |
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304 | |
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305 | !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! |
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