1 | module fracnnei_mod |
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2 | |
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3 | contains |
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4 | |
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5 | subroutine fracnnei() |
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6 | ! |
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7 | !**** |
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8 | ! ***************************** |
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9 | ! * OASIS ROUTINE - LEVEL 4 * |
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10 | ! * ------------- ------- * |
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11 | ! ***************************** |
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12 | ! |
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13 | !**** *fracnnei* - SCRIP remapping |
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14 | ! |
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15 | ! Purpose: |
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16 | ! ------- |
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17 | ! Treatment of the tricky points in an interpolation |
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18 | ! |
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19 | ! Interface: |
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20 | ! --------- |
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21 | ! *CALL* * |
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22 | ! |
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23 | ! Called from: |
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24 | ! ----------- |
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25 | ! scriprmp |
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26 | ! |
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27 | ! History: |
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28 | ! ------- |
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29 | ! Version Programmer Date Description |
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30 | ! ------- ---------- ---- ----------- |
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31 | ! 2.5 D.Declat 2002/08/20 adapted from S. Valcke ptmsq |
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32 | ! 3.0 S. Valcke 2002/10/30 test and corrections |
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33 | ! 4.0 A.Piacentini 2018/01/23 F90 and optimisation |
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34 | ! |
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35 | ! %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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36 | !* ---------------------------- Modules used ---------------------------- |
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37 | ! |
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38 | use kinds_mod ! defines common data types |
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39 | use constants ! defines common constants |
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40 | use grids ! module containing grid information |
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41 | use remap_vars ! module containing remap information |
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42 | use mod_oasis_flush |
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43 | !$ use omp_lib |
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44 | ! |
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45 | !* ---------------------------- Implicit -------------------------------- |
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46 | ! |
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47 | implicit none |
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48 | ! |
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49 | !* ---------------------------- Arguments ------------------------------- |
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50 | ! |
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51 | ! |
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52 | !* ---------------------------- Local Variables ------------------------ |
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53 | ! |
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54 | |
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55 | logical (kind=log_kind) :: ll_debug = .false. |
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56 | |
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57 | integer (kind=int_kind) :: num_neigh, num_prev_links |
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58 | logical (kind=log_kind), dimension(grid2_size) :: lnnei |
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59 | integer (kind=int_kind) :: & |
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60 | & ib_dst, & ! INDEX loop for the distance grid |
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61 | & ib_src, & ! INDEX loop for the source grid |
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62 | & ib_links ! INDEX loop for the links |
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63 | integer (kind=int_kind) :: & |
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64 | & il_nneiadd, & ! Nearest-neighbor address |
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65 | & il_lonkind, & |
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66 | & ib_bin, & |
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67 | & min_add, & |
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68 | & max_add |
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69 | real (kind=dbl_kind) :: & |
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70 | & coslatd, & ! cosinus of the latitude for dst |
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71 | & sinlatd, & ! sinus of the latitude for dst |
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72 | & coslond, & ! cosinus of the longitude for dst |
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73 | & sinlond, & ! sinus of the longitude for dst |
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74 | & lonwestd, & |
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75 | & loneastd, & |
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76 | & latsouthd, & |
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77 | & latnorthd, & |
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78 | & distance, & |
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79 | & dist_min, & |
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80 | & d_dist |
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81 | |
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82 | real (kind=dbl_kind), parameter :: dp_box = 2.0*deg2rad |
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83 | real (kind=dbl_kind), parameter :: dp_pthresh = 85.0*deg2rad |
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84 | |
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85 | real (kind=dbl_kind), dimension(grid1_size) :: & |
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86 | & coslats, & ! cosinus of the latitude for src |
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87 | & sinlats, & ! sinus of the latitude for src |
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88 | & coslons, & ! cosinus of the longitude for src |
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89 | & sinlons ! sinus of the longitude for src |
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90 | |
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91 | integer (kind=int_kind) :: ib_vmm, il_add |
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92 | integer (kind=int_kind), dimension(:), allocatable :: ila_dst |
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93 | integer (kind=int_kind) :: il_envthreads, il_err, il_splitsize, ib_thread |
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94 | integer (kind=int_kind) :: il_mythread |
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95 | integer (kind=int_kind) :: il_nbthreads = 1 |
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96 | integer (kind=int_kind), dimension(:), allocatable :: ila_thr_sz |
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97 | integer (kind=int_kind), dimension(:), allocatable :: ila_thr_mn |
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98 | integer (kind=int_kind), dimension(:), allocatable :: ila_thr_mx |
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99 | |
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100 | character (LEN=14) :: cl_envvar |
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101 | ! |
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102 | !* ---------------------------- Poema verses ---------------------------- |
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103 | ! |
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104 | ! %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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105 | ! |
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106 | !* 1. Initialization |
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107 | ! -------------- |
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108 | ! |
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109 | if (nlogprt .ge. 2) then |
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110 | write (UNIT = nulou,FMT = *) ' ' |
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111 | write (UNIT = nulou,FMT = *) ' ' |
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112 | write (UNIT = nulou,FMT = *) ' Entering ROUTINE fracnnei - Level 4' |
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113 | write (UNIT = nulou,FMT = *) ' **************** *******' |
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114 | write (UNIT = nulou,FMT = *) ' ' |
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115 | write (UNIT = nulou,FMT = *) ' Treating the tricky points of the remapping' |
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116 | write (UNIT = nulou,FMT = *) ' ' |
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117 | call OASIS_FLUSH_SCRIP(nulou) |
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118 | endif |
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119 | ! |
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120 | ! *---------------------------------------------------------------------- |
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121 | ! |
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122 | !* 2. Find Vmm points V |
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123 | ! --------------- m m |
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124 | ! A non-masked Valid target point is either with link or without link |
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125 | ! If without link, find the non-masked nearest neighbours. |
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126 | ! |
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127 | lnnei(:) = grid2_mask(:) |
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128 | do ib_links = 1, num_links_map1 |
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129 | lnnei(grid2_add_map1(ib_links)) = .false. |
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130 | end do |
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131 | |
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132 | num_neigh = count(lnnei) |
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133 | |
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134 | allocate(ila_dst(num_neigh)) |
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135 | |
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136 | ila_dst=pack([(ib_dst,ib_dst=1,grid2_size)],lnnei) |
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137 | |
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138 | if (nlogprt .ge. 2) then |
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139 | if (ll_debug) then |
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140 | do ib_vmm = 1, num_neigh |
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141 | write(nulou,*) '********* Will do FRACNNEI for point',ila_dst(ib_vmm) |
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142 | end do |
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143 | end if |
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144 | write(nulou,*) '************ There are',num_neigh,'Vmm points in all' |
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145 | end if |
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146 | |
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147 | ! |
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148 | ! *---------------------------------------------------------------------- |
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149 | ! |
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150 | !* 2. Treating Vmm points V |
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151 | ! ------------------- m m |
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152 | ! The target point is a non-masked Valid point while the source points |
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153 | ! are all masked points. Use of the non-masked nearest neighbours. |
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154 | ! |
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155 | |
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156 | ! Resize the storage |
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157 | |
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158 | num_prev_links = num_links_map1 |
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159 | num_links_map1 = num_links_map1 + num_neigh |
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160 | |
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161 | call resize_remap_vars(1, num_links_map1 - max_links_map1) |
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162 | |
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163 | !* -- Precompute src grid spherical coordinates |
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164 | |
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165 | coslats(:) = cos(grid1_center_lat(:)) |
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166 | coslons(:) = cos(grid1_center_lon(:)) |
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167 | sinlons(:) = sin(grid1_center_lon(:)) |
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168 | sinlats(:) = sin(grid1_center_lat(:)) |
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169 | |
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170 | call get_environment_variable(name='OASIS_OMP_NUM_THREADS', & |
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171 | & value=cl_envvar, status=il_err) |
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172 | if ( il_err .ne. 0) then |
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173 | il_envthreads = 0 |
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174 | else |
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175 | read(cl_envvar,*) il_envthreads |
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176 | end if |
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177 | |
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178 | !$OMP PARALLEL NUM_THREADS(il_envthreads) DEFAULT(NONE) & |
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179 | !$OMP SHARED(il_envthreads)& |
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180 | !$OMP SHARED(sga_remap)& |
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181 | !$OMP SHARED(il_nbthreads) & |
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182 | !$OMP SHARED(ila_thr_sz,ila_thr_mn,ila_thr_mx) & |
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183 | !$OMP SHARED(num_neigh,ll_debug,ila_dst,num_prev_links,nulou) & |
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184 | !$OMP SHARED(num_wts) & |
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185 | !$OMP SHARED(grid1_add_map1,grid2_add_map1,wts_map1) & |
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186 | !$OMP SHARED(grid1_center_lat,grid1_center_lon) & |
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187 | !$OMP SHARED(grid2_center_lat,grid2_center_lon) & |
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188 | !$OMP SHARED(grid1_mask,grid1_size) & |
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189 | !$OMP SHARED(bin_lats,bin_addr1,num_srch_bins) & |
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190 | !$OMP SHARED(coslats,coslons,sinlons,sinlats) & |
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191 | !$OMP PRIVATE(nlogprt,ib_vmm,il_add,ib_dst,ib_src) & |
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192 | !$OMP PRIVATE(coslatd,sinlatd,coslond,sinlond) & |
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193 | !$OMP PRIVATE(lonwestd,loneastd,latsouthd,latnorthd) & |
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194 | !$OMP PRIVATE(dist_min,il_nneiadd,d_dist,distance) & |
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195 | !$OMP PRIVATE(il_lonkind,ib_bin,min_add,max_add) & |
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196 | !$OMP PRIVATE(ib_thread,il_splitsize) |
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197 | |
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198 | !$OMP SINGLE |
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199 | |
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200 | il_nbthreads = 1 |
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201 | !$ il_nbthreads = OMP_GET_NUM_THREADS () |
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202 | |
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203 | allocate(ila_thr_mn(il_nbthreads)) |
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204 | allocate(ila_thr_mx(il_nbthreads)) |
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205 | |
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206 | if (il_nbthreads .gt. 1) then |
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207 | |
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208 | nlogprt = 0 |
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209 | |
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210 | allocate(ila_thr_sz(il_nbthreads)) |
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211 | ila_thr_sz(:) = floor(real(num_neigh)/il_nbthreads) |
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212 | ila_thr_sz(1:num_neigh-sum(ila_thr_sz)) = ila_thr_sz(1:num_neigh-sum(ila_thr_sz)) + 1 |
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213 | |
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214 | ila_thr_mn(1) = 1 |
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215 | ila_thr_mx(1) = ila_thr_sz(1) |
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216 | |
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217 | do ib_thread = 2, il_nbthreads |
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218 | ila_thr_mn(ib_thread) = sum(ila_thr_sz(1:ib_thread-1)) + 1 |
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219 | ila_thr_mx(ib_thread) = sum(ila_thr_sz(1:ib_thread)) |
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220 | end do |
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221 | |
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222 | allocate(sga_remap(il_nbthreads)) |
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223 | |
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224 | do ib_thread = 1, il_nbthreads |
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225 | il_splitsize = ila_thr_sz(ib_thread) |
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226 | sga_remap(ib_thread)%max_links = il_splitsize |
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227 | sga_remap(ib_thread)%num_links = 0 |
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228 | allocate(sga_remap(ib_thread)%grid1_add(il_splitsize)) |
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229 | allocate(sga_remap(ib_thread)%grid2_add(il_splitsize)) |
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230 | !EM allocate(sga_remap(ib_thread)%wts(num_wts,il_splitsize)) |
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231 | end do |
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232 | |
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233 | deallocate(ila_thr_sz) |
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234 | |
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235 | else |
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236 | |
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237 | ila_thr_mn(1) = 1 |
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238 | ila_thr_mx(1) = num_neigh |
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239 | |
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240 | end if |
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241 | !$OMP END SINGLE |
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242 | |
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243 | !* -- Find the nearest neighbours and store weights and address |
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244 | |
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245 | !$OMP DO SCHEDULE(STATIC,1) |
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246 | thread_loop: do ib_thread = 1, il_nbthreads |
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247 | |
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248 | grid_loop1: do ib_vmm = ila_thr_mn(ib_thread), ila_thr_mx(ib_thread) |
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249 | ib_dst = ila_dst(ib_vmm) |
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250 | il_add = num_prev_links+ib_vmm |
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251 | if (il_nbthreads .eq. 1) then |
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252 | grid2_add_map1(il_add) = ib_dst |
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253 | else |
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254 | sga_remap(ib_thread)%num_links = sga_remap(ib_thread)%num_links + 1 |
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255 | sga_remap(ib_thread)%grid2_add(sga_remap(ib_thread)%num_links) = ib_dst |
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256 | endif |
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257 | |
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258 | if (ll_debug) then |
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259 | write(nulou,*) 'ib_dst for true=',ib_dst |
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260 | write(nulou,*) 'counter_Vmm =',ib_vmm |
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261 | write(nulou,*) 'num_links+counter_Vmm =', il_add |
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262 | write(nulou,*) 'dst_addr =',grid2_add_map1(il_add) |
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263 | endif |
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264 | |
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265 | coslatd = cos(grid2_center_lat(ib_dst)) |
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266 | sinlatd = sin(grid2_center_lat(ib_dst)) |
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267 | coslond = cos(grid2_center_lon(ib_dst)) |
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268 | sinlond = sin(grid2_center_lon(ib_dst)) |
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269 | |
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270 | ! Draw a rough box around the target point (relaxed at poles) |
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271 | |
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272 | if (grid2_center_lat(ib_dst) >= dp_pthresh) then |
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273 | |
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274 | latsouthd = grid2_center_lat(ib_dst) - dp_box |
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275 | latnorthd = pih |
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276 | lonwestd = zero |
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277 | loneastd = pi2 |
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278 | il_lonkind = 0 |
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279 | |
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280 | else if (grid2_center_lat(ib_dst) <= -dp_pthresh) then |
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281 | |
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282 | latsouthd = -pih |
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283 | latnorthd = grid2_center_lat(ib_dst) + dp_box |
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284 | lonwestd = zero |
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285 | loneastd = pi2 |
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286 | il_lonkind = 0 |
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287 | |
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288 | else |
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289 | |
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290 | latsouthd = grid2_center_lat(ib_dst) - dp_box |
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291 | latnorthd = grid2_center_lat(ib_dst) + dp_box |
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292 | lonwestd = grid2_center_lon(ib_dst) - dp_box/coslatd |
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293 | loneastd = grid2_center_lon(ib_dst) + dp_box/coslatd |
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294 | |
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295 | if (lonwestd < zero) then |
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296 | il_lonkind = -1 |
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297 | else if (loneastd > pi2) then |
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298 | il_lonkind = 1 |
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299 | else |
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300 | il_lonkind = 0 |
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301 | end if |
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302 | |
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303 | end if |
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304 | |
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305 | dist_min = bignum |
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306 | il_nneiadd = 0 |
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307 | |
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308 | ! Restrict the loop by bins |
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309 | |
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310 | min_add = grid1_size |
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311 | max_add = 1 |
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312 | do ib_bin=1,num_srch_bins |
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313 | if (bin_lats(2,ib_bin).ge.latsouthd .and.& |
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314 | & bin_lats(1,ib_bin).le.latnorthd) then |
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315 | min_add = min(min_add, bin_addr1(1,ib_bin)) |
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316 | max_add = max(max_add, bin_addr1(2,ib_bin)) |
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317 | end if |
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318 | end do |
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319 | |
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320 | do ib_src = min_add, max_add |
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321 | |
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322 | ! Restrict the angular distance computation to a rough box |
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323 | |
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324 | if (grid1_mask(ib_src)) then |
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325 | |
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326 | if (grid1_center_lat(ib_src).le.latnorthd) then |
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327 | if (grid1_center_lat(ib_src).ge.latsouthd) then |
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328 | if (lf_loncheck(grid1_center_lon(ib_src),& |
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329 | & lonwestd,loneastd,il_lonkind)) then |
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330 | d_dist = coslatd*coslats(ib_src) * & |
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331 | & (coslond*coslons(ib_src) + & |
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332 | & sinlond*sinlons(ib_src)) + & |
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333 | & sinlatd*sinlats(ib_src) |
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334 | if (d_dist < -1.0d0) then |
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335 | d_dist = -1.0d0 |
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336 | else if (d_dist > 1.0d0) then |
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337 | d_dist = 1.0d0 |
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338 | end if |
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339 | distance = acos(d_dist) |
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340 | if (distance < dist_min) then |
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341 | il_nneiadd = ib_src |
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342 | dist_min = distance |
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343 | end if |
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344 | end if |
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345 | end if |
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346 | end if |
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347 | end if |
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348 | end do |
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349 | |
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350 | ! If the rough box was too small, search the entire grid |
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351 | |
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352 | if (il_nneiadd == 0 ) then |
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353 | dist_min = bignum |
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354 | do ib_src = 1, grid1_size |
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355 | if (grid1_mask(ib_src)) then |
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356 | d_dist = coslatd*coslats(ib_src) * & |
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357 | (coslond*coslons(ib_src) + & |
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358 | sinlond*sinlons(ib_src)) + & |
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359 | sinlatd*sinlats(ib_src) |
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360 | if (d_dist < -1.0d0) then |
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361 | d_dist = -1.0d0 |
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362 | else if (d_dist > 1.0d0) then |
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363 | d_dist = 1.0d0 |
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364 | end if |
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365 | distance = acos(d_dist) |
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366 | if (distance < dist_min) then |
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367 | il_nneiadd = ib_src |
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368 | dist_min = distance |
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369 | end if |
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370 | end if |
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371 | end do |
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372 | end if |
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373 | |
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374 | if (il_nbthreads .eq. 1) then |
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375 | grid1_add_map1(il_add) = il_nneiadd |
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376 | wts_map1(1,il_add) = 1.0 |
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377 | if (num_wts .gt. 1) then |
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378 | wts_map1(2,il_add) = 0.0 |
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379 | wts_map1(3,il_add) = 0.0 |
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380 | endif |
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381 | else |
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382 | sga_remap(ib_thread)%grid1_add(sga_remap(ib_thread)%num_links) = il_nneiadd |
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383 | endif |
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384 | if (ll_debug.and.nlogprt .ge. 2) then |
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385 | write(nulou,*) 'src_addr =',grid1_add_map1(il_add) |
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386 | write(nulou,*) '*************** Nearest source neighbour is ',il_nneiadd |
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387 | end if |
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388 | end do grid_loop1 |
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389 | |
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390 | end do thread_loop |
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391 | !$OMP END DO |
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392 | |
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393 | !$OMP END PARALLEL |
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394 | |
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395 | if (il_nbthreads .gt. 1) then |
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396 | sga_remap(1)%start_pos = num_prev_links + 1 |
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397 | il_splitsize = sga_remap(1)%num_links |
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398 | do ib_thread = 2, il_nbthreads |
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399 | il_splitsize = il_splitsize + sga_remap(ib_thread)%num_links |
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400 | sga_remap(ib_thread)%start_pos = sga_remap(ib_thread-1)%start_pos + & |
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401 | sga_remap(ib_thread-1)%num_links |
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402 | end do |
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403 | |
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404 | do ib_thread = 1, il_nbthreads |
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405 | grid1_add_map1(sga_remap(ib_thread)%start_pos: & |
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406 | sga_remap(ib_thread)%start_pos+ & |
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407 | sga_remap(ib_thread)%num_links-1) = & |
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408 | sga_remap(ib_thread)%grid1_add |
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409 | grid2_add_map1(sga_remap(ib_thread)%start_pos: & |
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410 | sga_remap(ib_thread)%start_pos+ & |
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411 | sga_remap(ib_thread)%num_links-1) = & |
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412 | sga_remap(ib_thread)%grid2_add |
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413 | wts_map1 (1,sga_remap(ib_thread)%start_pos: & |
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414 | sga_remap(ib_thread)%start_pos+ & |
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415 | sga_remap(ib_thread)%num_links-1) = 1.0 |
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416 | wts_map1 (2,sga_remap(ib_thread)%start_pos: & |
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417 | sga_remap(ib_thread)%start_pos+ & |
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418 | sga_remap(ib_thread)%num_links-1) = 0.0 |
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419 | wts_map1 (3,sga_remap(ib_thread)%start_pos: & |
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420 | sga_remap(ib_thread)%start_pos+ & |
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421 | sga_remap(ib_thread)%num_links-1) = 0.0 |
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422 | end do |
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423 | |
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424 | if (nlogprt.ge.2) then |
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425 | |
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426 | do ib_thread = 1, il_nbthreads |
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427 | if (sga_remap(ib_thread)%nb_resize.gt.0) then |
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428 | write(nulou,*) ' Number of thread_resize_remap_vars on thread ',& |
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429 | ib_thread, ' = ', sga_remap(ib_thread)%nb_resize |
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430 | end if |
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431 | end do |
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432 | |
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433 | end if |
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434 | |
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435 | end if |
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436 | |
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437 | deallocate(ila_thr_mn) |
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438 | deallocate(ila_thr_mx) |
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439 | if (il_nbthreads .gt. 1) then |
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440 | do ib_thread = 1, il_nbthreads |
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441 | deallocate(sga_remap(ib_thread)%grid1_add) |
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442 | deallocate(sga_remap(ib_thread)%grid2_add) |
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443 | !EM deallocate(sga_remap(ib_thread)%wts) |
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444 | end do |
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445 | deallocate(sga_remap) |
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446 | end if |
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447 | |
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448 | |
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449 | |
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450 | |
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451 | ! |
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452 | deallocate(ila_dst) |
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453 | ! |
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454 | ! *---------------------------------------------------------------------- |
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455 | ! |
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456 | if (nlogprt .ge. 2) then |
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457 | write (UNIT = nulou,FMT = *) ' ' |
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458 | write (UNIT = nulou,FMT = *) ' Leaving ROUTINE fracnnei - Level 4' |
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459 | write (UNIT = nulou,FMT = *) ' ' |
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460 | call OASIS_FLUSH_SCRIP(nulou) |
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461 | end if |
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462 | |
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463 | contains |
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464 | |
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465 | logical (kind=log_kind) function lf_loncheck(rd_lon,rd_west,rd_east,id_kind) |
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466 | |
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467 | real (kind=dbl_kind), intent(in) :: rd_lon |
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468 | real (kind=dbl_kind), intent(in) :: rd_west,rd_east |
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469 | integer (kind=int_kind), intent(in) :: id_kind |
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470 | |
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471 | select case(id_kind) |
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472 | |
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473 | case(0) |
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474 | lf_loncheck = (rd_lon>=rd_west) .and. (rd_lon<=rd_east) |
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475 | case(-1) |
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476 | lf_loncheck = (rd_lon-pi2>=rd_west) .or. (rd_lon<=rd_east) |
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477 | case(1) |
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478 | lf_loncheck = (rd_lon>=rd_west) .or. (rd_lon+pi2<=rd_east) |
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479 | end select |
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480 | |
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481 | end function lf_loncheck |
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482 | |
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483 | end subroutine fracnnei |
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484 | |
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485 | !*********************************************************************** |
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486 | |
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487 | |
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488 | end module fracnnei_mod |
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