1 | subroutine fracnnei (src_size, dst_size, |
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2 | $ ld_srcmask, ld_dstmask, |
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3 | $ src_lon, src_lat, dst_lon, dst_lat, |
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4 | $ num_links, num_wgts, |
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5 | $ weights, src_addr, dst_addr) |
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6 | C**** |
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7 | C ***************************** |
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8 | C * OASIS ROUTINE - LEVEL 4 * |
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9 | C * ------------- ------- * |
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10 | C ***************************** |
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11 | C |
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12 | C**** *fracnnei* - SCRIP remapping |
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13 | C |
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14 | C Purpose: |
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15 | C ------- |
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16 | C Treatment of the tricky points in an interpolation |
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17 | C |
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18 | C Interface: |
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19 | C --------- |
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20 | C *CALL* * |
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21 | C |
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22 | C Called from: |
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23 | C ----------- |
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24 | C scriprmp |
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25 | C |
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26 | C Input: |
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27 | C ----- |
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28 | C src_size : source grid size (integer) |
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29 | C dst_size : target grid size (integer) |
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30 | C ld_srcmask : mask of the source grid |
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31 | C ld_dstmask : mask of the target grid |
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32 | C src_lon : longitudes of the source grid |
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33 | C src_lat : latitudes of the source grid |
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34 | C dst_lon : longitudes of the target grid |
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35 | C dst_lat : latitudes of the target grid |
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36 | C num_links : total number of links |
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37 | C num_wgts : number of weights for each link |
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38 | C InOut |
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39 | C ----- |
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40 | C weights : remapping weights |
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41 | C src_addr : remapping source addresses |
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42 | C dst_addr : remapping target addresses |
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43 | C |
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44 | C History: |
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45 | C ------- |
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46 | C Version Programmer Date Description |
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47 | C ------- ---------- ---- ----------- |
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48 | C 2.5 D.Declat 2002/08/20 adapted from S. Valcke ptmsq |
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49 | C 3.0 S. Valcke 2002/10/30 test and corrections |
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50 | C |
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51 | C %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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52 | C* ---------------------------- Modules used ---------------------------- |
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53 | C |
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54 | use kinds_mod ! defines common data types |
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55 | use constants ! defines common constants |
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56 | use grids ! module containing grid information |
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57 | use remap_vars ! module containing remap information |
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58 | USE mod_oasis_flush |
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59 | C |
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60 | C* ---------------------------- Implicit -------------------------------- |
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61 | C |
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62 | implicit none |
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63 | C |
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64 | C* ---------------------------- Include files --------------------------- |
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65 | C |
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66 | |
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67 | C INCLUDE 'netcdf.inc' |
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68 | C |
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69 | C* ---------------------------- Intent In ------------------------------- |
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70 | C |
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71 | INTEGER (kind=int_kind) :: |
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72 | $ src_size, ! size of the source grid |
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73 | $ dst_size ! size of the destination grid |
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74 | C |
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75 | REAL (kind=dbl_kind) :: |
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76 | $ src_lat(src_size), src_lon(src_size), |
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77 | $ dst_lat(dst_size), dst_lon(dst_size) |
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78 | |
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79 | C |
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80 | LOGICAL :: |
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81 | $ ld_srcmask(src_size), ! source grid mask |
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82 | $ ld_dstmask(dst_size) ! target grid mask |
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83 | C |
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84 | INTEGER (kind=int_kind) :: |
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85 | $ num_links, ! number of links between src and tgt |
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86 | $ num_wgts ! number of weights |
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87 | |
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88 | C |
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89 | C* ---------------------------- Intent InOut ------------------------------ |
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90 | C |
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91 | REAL (kind=dbl_kind) :: |
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92 | $ weights(num_wgts, num_links) ! remapping weights |
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93 | C |
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94 | INTEGER (kind=int_kind) :: |
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95 | $ src_addr(num_links), ! remapping source addresses |
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96 | $ dst_addr(num_links) ! remapping target addresses |
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97 | C |
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98 | C* ---------------------------- Local declarations ---------------------- |
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99 | C |
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100 | C |
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101 | INTEGER (kind=int_kind) :: |
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102 | $ ila_nneiadd ! Nearest-neighbor address |
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103 | C |
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104 | INTEGER (kind=int_kind) :: |
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105 | $ ib_dst, ! INDEX loop for the distance grid |
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106 | $ ib_src, ! INDEX loop for the source grid |
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107 | $ ib_neigh, ! INDEX loop on the corresponding src pts |
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108 | $ ib_links ! INDEX loop for the links |
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109 | C |
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110 | INTEGER (kind=int_kind) :: |
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111 | $ nb_Vmm, ! number of Mtt points |
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112 | $ ntottotland, ! number of land points |
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113 | $ ntotland, ! number of land points |
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114 | $ ntotoce, ! number of oceanic points |
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115 | $ ntotngh ! number of corresponding source points |
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116 | C |
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117 | INTEGER (kind=int_kind) :: |
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118 | $ beg_links, ! begining of the serie of links |
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119 | $ nb_links ! number of links |
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120 | C |
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121 | REAL (kind=dbl_kind) :: |
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122 | $ coslat, ! cosinus of the latitude |
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123 | $ sinlat, ! sinus of the latitude |
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124 | $ coslon, ! cosinus of the longitude |
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125 | $ sinlon, ! sinus of the longitude |
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126 | $ distance, |
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127 | $ dist_min, |
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128 | $ arg |
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129 | C |
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130 | INTEGER (kind=int_kind) :: n, il |
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131 | C |
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132 | C* ---------------------------- Poema verses ---------------------------- |
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133 | C |
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134 | C %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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135 | C |
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136 | C* 1. Initialization |
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137 | C -------------- |
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138 | C |
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139 | IF (nlogprt .GE. 2) THEN |
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140 | WRITE (UNIT = nulou,FMT = *) ' ' |
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141 | WRITE (UNIT = nulou,FMT = *) ' ' |
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142 | WRITE (UNIT = nulou,FMT = *) |
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143 | $ ' Entering ROUTINE fracnnei - Level 4' |
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144 | WRITE (UNIT = nulou,FMT = *) |
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145 | $ ' **************** *******' |
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146 | WRITE (UNIT = nulou,FMT = *) ' ' |
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147 | WRITE (UNIT = nulou,FMT = *) |
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148 | $ ' Treating the tricky points of the remapping' |
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149 | WRITE (UNIT = nulou,FMT = *) ' ' |
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150 | CALL OASIS_FLUSH_SCRIP(nulou) |
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151 | ENDIF |
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152 | C |
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153 | C *---------------------------------------------------------------------- |
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154 | C |
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155 | C* 2. Treating Vmm points V |
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156 | C ------------------- m m |
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157 | C The target point is a non-masked Valid point while the source points |
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158 | C are all masked points. Use of the non-masked nearest neighbours. |
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159 | C |
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160 | nb_Vmm = 0 |
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161 | ntottotland = 0 |
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162 | beg_links = 1 |
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163 | |
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164 | C* -- Loop all other the target points |
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165 | DO ib_dst = 1, dst_size |
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166 | C* -- If the point is a sea point |
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167 | IF (ld_dstmask(ib_dst)) THEN |
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168 | |
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169 | beg_links = 0 |
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170 | |
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171 | DO ib_links = 1, num_links |
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172 | IF (dst_addr(ib_links) .eq. ib_dst) THEN |
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173 | beg_links = ib_links |
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174 | exit |
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175 | ENDIF |
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176 | END DO |
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177 | |
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178 | IF (beg_links .ne. 0) THEN |
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179 | |
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180 | ntotland = 0 |
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181 | ntotoce = 0 |
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182 | ntotngh = 0 |
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183 | |
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184 | C* -- Find the number of associated src points to the non-masked tgt point |
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185 | nb_links = 1 |
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186 | DO il = beg_links+1, num_links |
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187 | IF (dst_addr(il) .eq. dst_addr(beg_links)) |
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188 | $ nb_links = nb_links + 1 |
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189 | END DO |
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190 | |
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191 | C* -- For each point on the src grid associated to the non-masked tgt point |
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192 | DO ib_neigh = 1, nb_links |
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193 | C |
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194 | ntotngh = ntotngh + 1 |
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195 | |
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196 | C* -- Check IF the point is a masked or non-masked point and treat it |
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197 | IF (.not. ld_srcmask(src_addr(beg_links+ib_neigh-1))) |
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198 | $ THEN |
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199 | ntotland = ntotland + 1 |
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200 | ntottotland = ntottotland + 1 |
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201 | ELSE IF (ld_srcmask(src_addr(beg_links+ib_neigh-1))) |
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202 | $ THEN |
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203 | ntotoce = ntotoce + 1 |
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204 | ELSE |
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205 | WRITE (nulou, *) 'Pb with ocean mask with Mtt 1' |
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206 | END IF |
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207 | |
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208 | END DO |
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209 | |
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210 | C* -- If all the src points are land, treat it ! |
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211 | IF (ntotland .EQ. ntotngh) THEN |
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212 | nb_Vmm = nb_Vmm + 1 |
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213 | WRITE(nulou,*) |
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214 | $ '************ Doing FRACNNEI for point', ib_dst |
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215 | |
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216 | C* -- Find the nearest neighbours and change weights and address |
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217 | |
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218 | coslat = cos(dst_lat(ib_dst)) |
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219 | sinlat = sin(dst_lat(ib_dst)) |
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220 | coslon = cos(dst_lon(ib_dst)) |
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221 | sinlon = sin(dst_lon(ib_dst)) |
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222 | |
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223 | dist_min = bignum |
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224 | ila_nneiadd = 0 |
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225 | DO ib_src = 1, src_size |
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226 | IF (ld_srcmask(ib_src)) THEN |
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227 | arg = |
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228 | & coslat*cos(src_lat(ib_src))* |
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229 | & (coslon*cos(src_lon(ib_src)) + |
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230 | & sinlon*sin(src_lon(ib_src)))+ |
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231 | & sinlat*sin(src_lat(ib_src)) |
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232 | IF (arg < -1.0d0) THEN |
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233 | arg = -1.0d0 |
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234 | ELSE IF (arg > 1.0d0) THEN |
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235 | arg = 1.0d0 |
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236 | END IF |
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237 | distance = acos(arg) |
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238 | IF (distance < dist_min) THEN |
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239 | ila_nneiadd = ib_src |
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240 | dist_min = distance |
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241 | ENDIF |
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242 | ENDIF |
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243 | END DO |
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244 | src_addr(beg_links) = ila_nneiadd |
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245 | weights(1,beg_links) = 1.0 |
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246 | WRITE(nulou,*) |
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247 | $ '*************** Nearest source neighbour is ', |
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248 | $ ila_nneiadd |
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249 | IF (nb_links > 1) then |
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250 | DO n=2, nb_links |
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251 | src_addr(beg_links+n-1)=0 |
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252 | weights(1,beg_links+n-1)=0.0 |
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253 | END DO |
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254 | END IF |
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255 | END IF |
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256 | END IF |
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257 | ENDIF |
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258 | END DO |
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259 | C |
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260 | C |
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261 | C *---------------------------------------------------------------------- |
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262 | C |
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263 | IF (nlogprt .GE. 2) THEN |
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264 | WRITE (UNIT = nulou,FMT = *) ' ' |
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265 | WRITE (UNIT = nulou,FMT = *) |
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266 | $ ' Leaving ROUTINE fracnnei - Level 4' |
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267 | WRITE (UNIT = nulou,FMT = *) ' ' |
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268 | CALL OASIS_FLUSH_SCRIP(nulou) |
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269 | ENDIF |
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270 | |
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271 | END SUBROUTINE fracnnei |
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272 | |
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273 | !*********************************************************************** |
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274 | |
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275 | |
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