1 | ;+ |
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2 | ; |
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3 | ; @file_comments |
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4 | ; compute the weight and address need to interpolate data from a |
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5 | ; "regular grid" to any grid using the imoms3 method |
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6 | ; |
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7 | ; @categories |
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8 | ; Interpolation |
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9 | ; |
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10 | ; @param alonin {in}{required}{type=2d array} |
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11 | ; longitude of the input data |
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12 | ; |
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13 | ; @param alatin {in}{required}{type=2d array} |
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14 | ; latitude of the input data |
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15 | ; |
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16 | ; @param olonin {in}{required}{type=2d array} |
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17 | ; longitude of the output data |
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18 | ; |
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19 | ; @param olat {in}{required}{type=2d array} |
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20 | ; latitude of the output data |
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21 | ; |
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22 | ; @keyword NONORTHERNLINE {type=scalar 0 or 1}{default=0} |
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23 | ; put 1 if you don't want to take into |
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24 | ; account the northern line of the input data when performing the interpolation. |
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25 | ; |
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26 | ; @keyword NOSOUTHERNLINE {type=scalar 0 or 1}{default=0} |
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27 | ; put 1 if you don't want to take into |
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28 | ; account the southern line of the input data when performing the interpolation. |
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29 | ; |
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30 | ; @param weig {out}{type=2d array} |
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31 | ; (see ADDR) |
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32 | ; |
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33 | ; @param addr {out}{type=2d array} |
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34 | ; 2D arrays, weig and addr are the weight and addresses used to |
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35 | ; perform the interpolation: |
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36 | ; dataout = total(weig*datain[addr], 1) |
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37 | ; dataout = reform(dataout, jpio, jpjo, /over) |
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38 | ; |
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39 | ; @restrictions |
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40 | ; - the input grid must be a "regular/rectangular grid", defined as a grid for |
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41 | ; which each longitude lines have the same latitude and each latitude columns |
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42 | ; have the same longitude. |
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43 | ; - We supposed the data are located on a sphere, with a periodicity along |
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44 | ; the longitude. |
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45 | ; - points located between the first/last 2 lines are interpolated |
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46 | ; using a imoms3 interpolation along the longitudinal direction and linear |
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47 | ; interpolation along the latitudinal direction |
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48 | ; - points located out of the southern and northern boundaries are interpolated |
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49 | ; using a imoms3 interpolation only along the longitudinal direction. |
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50 | ; |
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51 | ; @history |
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52 | ; November 2005: Sebastien Masson (smasson\@lodyc.jussieu.fr) |
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53 | ; March 2006: works for rectangular grids |
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54 | ; |
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55 | ; @version |
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56 | ; $Id$ |
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57 | ; |
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58 | ;- |
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59 | PRO compute_fromreg_imoms3_weigaddr, alonin, alatin, olonin, olat, weig, addr $ |
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60 | , NONORTHERNLINE=nonorthernline, $ |
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61 | NOSOUTHERNLINE=nosouthernline |
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62 | ; |
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63 | compile_opt idl2, strictarrsubs |
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64 | ; |
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65 | alon = alonin |
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66 | alat = alatin |
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67 | olon = olonin |
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68 | ; |
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69 | jpia = n_elements(alon) |
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70 | jpja = n_elements(alat) |
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71 | ; |
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72 | jpio = (size(olon, /dimensions))[0] |
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73 | jpjo = (size(olon, /dimensions))[1] |
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74 | ; |
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75 | ; alon |
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76 | minalon = min(alon, max = maxalon) |
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77 | IF maxalon-minalon GE 360. THEN stop |
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78 | ; alon must be monotonically increasing |
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79 | IF array_equal(sort(alon), lindgen(jpia)) NE 1 THEN BEGIN |
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80 | shiftx = -(where(alon EQ min(alon)))[0] |
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81 | alon = shift(alon, shiftx) |
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82 | IF array_equal(sort(alon), lindgen(jpia)) NE 1 THEN stop |
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83 | ENDIF ELSE shiftx = 0 |
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84 | ; alon is it regularly spaced? |
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85 | step = alon-shift(alon, 1) |
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86 | step[0] = step[0] + 360. |
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87 | IF total((step-step[0]) GE 1.e-6) NE 0 THEN noregx = 1 |
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88 | ; we extend the longitude range of alon (-> easy interpolation even |
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89 | ; near minalon and maxalon) |
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90 | toadd = 10*jpia/360+1 |
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91 | alon = [alon[jpia-toadd:jpia-1]-360., alon[*], alon[0:toadd-1]+360.] |
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92 | jpia = jpia+2*toadd |
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93 | ; alat |
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94 | revy = alat[0] GT alat[1] |
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95 | IF revy THEN alat = reverse(alat) |
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96 | ; alat must be monotonically increasing |
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97 | IF array_equal(sort(alat), lindgen(jpja)) NE 1 THEN stop |
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98 | ; alat is it regularly spaced? |
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99 | step = alat-shift(alat, 1) |
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100 | step = step[1:jpja - 1L] |
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101 | IF total((step-step[0]) GE 1.e-6) NE 0 THEN noregy = 1 |
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102 | ; |
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103 | if keyword_set(nonorthernline) then BEGIN |
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104 | jpja = jpja - 1L |
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105 | alat = alat[0: jpja-1L] |
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106 | ENDIF |
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107 | if keyword_set(nosouthernline) then BEGIN |
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108 | alat = alat[1: jpja-1L] |
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109 | jpja = jpja - 1L |
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110 | ENDIF |
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111 | ; olon between minalon and minalon+360 |
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112 | out = where(olon LT minalon) |
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113 | WHILE out[0] NE -1 DO BEGIN |
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114 | olon[out] = olon[out]+360. |
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115 | out = where(olon LT minalon) |
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116 | ENDWHILE |
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117 | out = where(olon GE minalon+360.) |
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118 | WHILE out[0] NE -1 DO BEGIN |
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119 | olon[out] = olon[out]- 360. |
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120 | out = where(olon GE minalon+360.) |
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121 | ENDWHILE |
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122 | ; make sure that all values of olon are located within values of alon |
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123 | IF min(olon, max = ma) LT minalon THEN stop |
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124 | IF ma GE minalon+360. THEN stop |
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125 | ; |
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126 | xaddr = lonarr(16, jpio*jpjo) |
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127 | yaddr = lonarr(16, jpio*jpjo) |
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128 | weig = fltarr(16, jpio*jpjo) |
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129 | ; |
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130 | indexlon = value_locate(alon, olon) |
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131 | IF total(alon[indexlon] GT olon) NE 0 THEN stop |
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132 | IF total(alon[indexlon + 1L] LE olon) NE 0 THEN stop |
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133 | IF (where(indexlon LE 1L ))[0] NE -1 THEN stop |
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134 | IF (where(indexlon GE jpia-3L))[0] NE -1 THEN stop |
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135 | indexlat = value_locate(alat, olat) |
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136 | ; |
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137 | ; for the ocean points located below the atm line |
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138 | ; jpja-2 and above the line 1 |
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139 | ; for those points we can always find 16 neighbors |
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140 | ; imoms interpolation along longitude and latitude |
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141 | ; |
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142 | short = where(indexlat LT jpja-2L AND indexlat GE 1L) |
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143 | ilon = indexlon[short] |
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144 | ilat = indexlat[short] |
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145 | ; |
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146 | IF NOT keyword_set(noregy) THEN BEGIN |
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147 | delta = alat[ilat+1L]-alat[ilat] |
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148 | IF max(abs(delta-delta[0])) GE 1.e-6 THEN stop |
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149 | delta = delta[0] |
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150 | ; |
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151 | d0 = (alat[ilat-1L]-olat[short])/delta |
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152 | IF min(d0, max = ma) LE -2 THEN stop |
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153 | IF ma GT -1 THEN stop |
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154 | wy0 = imoms3(temporary(d0)) |
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155 | d1 = (alat[ilat ]-olat[short])/delta |
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156 | IF min(d1, max = ma) LE -1 THEN stop |
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157 | IF ma GT 0 THEN stop |
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158 | wy1 = imoms3(temporary(d1)) |
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159 | d2 = (alat[ilat+1L]-olat[short])/delta |
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160 | IF min(d2, max = ma) LE 0 THEN stop |
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161 | IF ma GT 1 THEN stop |
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162 | wy2 = imoms3(temporary(d2)) |
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163 | d3 = (alat[ilat+2L]-olat[short])/delta |
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164 | IF min(d3, max = ma) LE 1 THEN stop |
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165 | IF ma GT 2 THEN stop |
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166 | wy3 = imoms3(temporary(d3)) |
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167 | ENDIF ELSE BEGIN |
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168 | nele = n_elements(short) |
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169 | wy0 = fltarr(nele) |
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170 | wy1 = fltarr(nele) |
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171 | wy2 = fltarr(nele) |
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172 | wy3 = fltarr(nele) |
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173 | FOR i = 0L, nele-1 DO BEGIN |
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174 | IF i MOD 10000 EQ 0 THEN print, i |
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175 | newlat = spl_incr(alat[ilat[i]-1L:ilat[i]+2L], [-1., 0., 1., 2.], olat[short[i]]) |
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176 | IF newlat LE 0 THEN stop |
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177 | IF newlat GT 1 THEN stop |
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178 | wy0[i] = imoms3(newlat+1) |
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179 | wy1[i] = imoms3(newlat) |
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180 | wy2[i] = imoms3(1-newlat) |
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181 | wy3[i] = imoms3(2-newlat) |
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182 | ENDFOR |
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183 | ENDELSE |
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184 | ; |
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185 | mi = min(wy0+wy1+wy2+wy3, max = ma) |
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186 | IF abs(mi-1) GE 1.e-6 THEN stop |
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187 | IF abs(ma-1) GE 1.e-6 THEN stop |
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188 | ; |
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189 | IF NOT keyword_set(noregx) THEN BEGIN |
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190 | delta = alon[ilon]-alon[ilon-1L] |
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191 | IF max(abs(delta-delta[0])) GE 1.e-6 THEN stop |
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192 | delta = delta[0] |
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193 | ; |
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194 | d0 = (alon[ilon-1L]-olon[short])/delta |
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195 | IF min(d0, max = ma) LE -2 THEN stop |
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196 | IF ma GT -1 THEN stop |
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197 | wx0 = imoms3(temporary(d0)) |
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198 | d1 = (alon[ilon ]-olon[short])/delta |
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199 | IF min(d1, max = ma) LE -1 THEN stop |
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200 | IF ma GT 0 THEN stop |
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201 | wx1 = imoms3(temporary(d1)) |
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202 | d2 = (alon[ilon+1L]-olon[short])/delta |
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203 | IF min(d2, max = ma) LE 0 THEN stop |
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204 | IF ma GT 1 THEN stop |
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205 | wx2 = imoms3(temporary(d2)) |
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206 | d3 = (alon[ilon+2L]-olon[short])/delta |
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207 | IF min(d3, max = ma) LE 1 THEN stop |
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208 | IF ma GT 2 THEN stop |
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209 | wx3 = imoms3(temporary(d3)) |
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210 | ENDIF ELSE BEGIN |
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211 | nele = n_elements(short) |
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212 | wx0 = fltarr(nele) |
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213 | wx1 = fltarr(nele) |
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214 | wx2 = fltarr(nele) |
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215 | wx3 = fltarr(nele) |
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216 | FOR i = 0L, nele-1 DO BEGIN |
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217 | IF i MOD 10000 EQ 0 THEN print, i |
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218 | newlon = spl_incr(alon[ilon[i]-1L:ilon[i]+2L], [-1., 0., 1., 2.], olon[short[i]]) |
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219 | IF newlon LE 0 THEN stop |
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220 | IF newlon GT 1 THEN stop |
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221 | wx0[i] = imoms3(newlon+1) |
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222 | wx1[i] = imoms3(newlon) |
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223 | wx2[i] = imoms3(1-newlon) |
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224 | wx3[i] = imoms3(2-newlon) |
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225 | ENDFOR |
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226 | ENDELSE |
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227 | ; |
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228 | mi = min(wx0+wx1+wx2+wx3, max = ma) |
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229 | IF abs(mi-1) GE 1.e-6 THEN stop |
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230 | IF abs(ma-1) GE 1.e-6 THEN stop |
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231 | ; |
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232 | ; line 0 |
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233 | xaddr[0, short] = ilon - 1L |
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234 | xaddr[1, short] = ilon |
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235 | xaddr[2, short] = ilon + 1L |
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236 | xaddr[3, short] = ilon + 2L |
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237 | yaddr[0, short] = ilat - 1L |
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238 | yaddr[1, short] = yaddr[0, short] |
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239 | yaddr[2, short] = yaddr[0, short] |
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240 | yaddr[3, short] = yaddr[0, short] |
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241 | weig[0, short] = wx0 * wy0 |
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242 | weig[1, short] = wx1 * wy0 |
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243 | weig[2, short] = wx2 * wy0 |
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244 | weig[3, short] = wx3 * wy0 |
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245 | ; line 1 |
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246 | xaddr[4, short] = ilon - 1L |
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247 | xaddr[5, short] = ilon |
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248 | xaddr[6, short] = ilon + 1L |
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249 | xaddr[7, short] = ilon + 2L |
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250 | yaddr[4, short] = ilat |
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251 | yaddr[5, short] = ilat |
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252 | yaddr[6, short] = ilat |
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253 | yaddr[7, short] = ilat |
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254 | weig[4, short] = wx0 * wy1 |
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255 | weig[5, short] = wx1 * wy1 |
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256 | weig[6, short] = wx2 * wy1 |
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257 | weig[7, short] = wx3 * wy1 |
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258 | ; line 2 |
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259 | xaddr[8, short] = ilon - 1L |
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260 | xaddr[9, short] = ilon |
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261 | xaddr[10, short] = ilon + 1L |
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262 | xaddr[11, short] = ilon + 2L |
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263 | yaddr[8, short] = ilat + 1L |
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264 | yaddr[9, short] = yaddr[8, short] |
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265 | yaddr[10, short] = yaddr[8, short] |
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266 | yaddr[11, short] = yaddr[8, short] |
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267 | weig[8, short] = wx0 * wy2 |
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268 | weig[9, short] = wx1 * wy2 |
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269 | weig[10, short] = wx2 * wy2 |
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270 | weig[11, short] = wx3 * wy2 |
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271 | ; line 3 |
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272 | xaddr[12, short] = ilon - 1L |
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273 | xaddr[13, short] = ilon |
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274 | xaddr[14, short] = ilon + 1L |
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275 | xaddr[15, short] = ilon + 2L |
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276 | yaddr[12, short] = ilat + 2L |
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277 | yaddr[13, short] = yaddr[12, short] |
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278 | yaddr[14, short] = yaddr[12, short] |
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279 | yaddr[15, short] = yaddr[12, short] |
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280 | weig[12, short] = wx0 * wy3 |
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281 | weig[13, short] = wx1 * wy3 |
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282 | weig[14, short] = wx2 * wy3 |
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283 | weig[15, short] = wx3 * wy3 |
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284 | ; |
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285 | mi = min(total(weig[*, short], 1, /double), max = ma) |
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286 | IF abs(mi-1) GE 1.e-6 THEN stop |
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287 | IF abs(ma-1) GE 1.e-6 THEN stop |
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288 | ; |
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289 | ; for the ocean points located between the atm lines |
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290 | ; jpja-2 and jpja-1 or between the atm lines 0 and 1 |
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291 | ; linear interpolation between line 1 and line 2 |
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292 | ; |
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293 | short = where(indexlat EQ jpja-2L OR indexlat EQ 0) |
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294 | IF short[0] NE -1 THEN BEGIN |
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295 | ilon = indexlon[short] |
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296 | ilat = indexlat[short] |
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297 | ; |
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298 | delta = alat[ilat+1L]-alat[ilat] |
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299 | IF NOT keyword_set(noregy) THEN BEGIN |
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300 | IF max(abs(delta-delta[0])) GE 1.e-6 THEN stop |
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301 | delta = delta[0] |
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302 | ENDIF |
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303 | ; |
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304 | d1 = (alat[ilat ]-olat[short])/delta |
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305 | IF min(d1, max = ma) LE -1 THEN stop |
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306 | IF ma GT 0 THEN stop |
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307 | wy1 = 1.+ temporary(d1) |
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308 | d2 = (alat[ilat+1L]-olat[short])/delta |
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309 | IF min(d2, max = ma) LE 0 THEN stop |
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310 | IF ma GT 1 THEN stop |
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311 | wy2 = 1.- temporary(d2) |
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312 | ; |
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313 | mi = min(wy1+wy2, max = ma) |
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314 | IF abs(mi-1) GE 1.e-6 THEN stop |
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315 | IF abs(ma-1) GE 1.e-6 THEN stop |
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316 | ; but imoms3 along the longitude |
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317 | IF NOT keyword_set(noregx) THEN BEGIN |
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318 | delta = alon[ilon]-alon[ilon-1L] |
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319 | IF max(abs(delta-delta[0])) GE 1.e-6 THEN stop |
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320 | delta = delta[0] |
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321 | ; |
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322 | d0 = (alon[ilon-1L]-olon[short])/delta |
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323 | IF min(d0, max = ma) LE -2 THEN stop |
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324 | IF ma GT -1 THEN stop |
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325 | wx0 = imoms3(temporary(d0)) |
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326 | d1 = (alon[ilon ]-olon[short])/delta |
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327 | IF min(d1, max = ma) LE -1 THEN stop |
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328 | IF ma GT 0 THEN stop |
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329 | wx1 = imoms3(temporary(d1)) |
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330 | d2 = (alon[ilon+1L]-olon[short])/delta |
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331 | IF min(d2, max = ma) LE 0 THEN stop |
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332 | IF ma GT 1 THEN stop |
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333 | wx2 = imoms3(temporary(d2)) |
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334 | d3 = (alon[ilon+2L]-olon[short])/delta |
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335 | IF min(d3, max = ma) LE 1 THEN stop |
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336 | IF ma GT 2 THEN stop |
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337 | wx3 = imoms3(temporary(d3)) |
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338 | ENDIF ELSE BEGIN |
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339 | nele = n_elements(short) |
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340 | wx0 = fltarr(nele) |
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341 | wx1 = fltarr(nele) |
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342 | wx2 = fltarr(nele) |
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343 | wx3 = fltarr(nele) |
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344 | FOR i = 0L, nele-1 DO BEGIN |
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345 | IF i MOD 10000 EQ 0 THEN print, i |
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346 | newlon = spl_incr(alon[ilon[i]-1L:ilon[i]+2L], [-1., 0., 1., 2.], olon[short[i]]) |
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347 | IF newlon LE 0 THEN stop |
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348 | IF newlon GT 1 THEN stop |
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349 | wx0[i] = imoms3(newlon+1) |
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350 | wx1[i] = imoms3(newlon) |
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351 | wx2[i] = imoms3(1-newlon) |
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352 | wx3[i] = imoms3(2-newlon) |
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353 | ENDFOR |
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354 | ENDELSE |
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355 | ; |
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356 | mi = min(wx0+wx1+wx2+wx3, max = ma) |
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357 | IF abs(mi-1) GE 1.e-6 THEN stop |
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358 | IF abs(ma-1) GE 1.e-6 THEN stop |
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359 | ; line 1 |
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360 | xaddr[0, short] = ilon - 1L |
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361 | xaddr[1, short] = ilon |
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362 | xaddr[2, short] = ilon + 1L |
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363 | xaddr[3, short] = ilon + 2L |
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364 | yaddr[0, short] = ilat |
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365 | yaddr[1, short] = ilat |
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366 | yaddr[2, short] = ilat |
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367 | yaddr[3, short] = ilat |
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368 | weig[0, short] = wx0 * wy1 |
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369 | weig[1, short] = wx1 * wy1 |
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370 | weig[2, short] = wx2 * wy1 |
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371 | weig[3, short] = wx3 * wy1 |
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372 | ; line 2 |
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373 | xaddr[4, short] = ilon - 1L |
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374 | xaddr[5, short] = ilon |
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375 | xaddr[6, short] = ilon + 1L |
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376 | xaddr[7, short] = ilon + 2L |
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377 | yaddr[4, short] = ilat + 1L |
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378 | yaddr[5, short] = yaddr[4, short] |
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379 | yaddr[6, short] = yaddr[4, short] |
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380 | yaddr[7, short] = yaddr[4, short] |
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381 | weig[4, short] = wx0 * wy2 |
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382 | weig[5, short] = wx1 * wy2 |
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383 | weig[6, short] = wx2 * wy2 |
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384 | weig[7, short] = wx3 * wy2 |
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385 | ; |
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386 | mi = min(total(weig[*, short], 1, /double), max = ma) |
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387 | IF abs(mi-1) GE 1.e-6 THEN stop |
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388 | IF abs(ma-1) GE 1.e-6 THEN stop |
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389 | ; |
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390 | ENDIF |
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391 | ; |
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392 | ; for the ocean points located below the line 0 |
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393 | ; Interpolation only along the longitude |
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394 | ; |
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395 | short = where(indexlat EQ -1) |
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396 | IF short[0] NE -1 THEN BEGIN |
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397 | ilon = indexlon[short] |
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398 | ; |
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399 | IF NOT keyword_set(noregx) THEN BEGIN |
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400 | delta = alon[ilon]-alon[ilon-1L] |
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401 | IF max(abs(delta-delta[0])) GE 1.e-6 THEN stop |
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402 | delta = delta[0] |
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403 | ; |
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404 | d0 = (alon[ilon-1L]-olon[short])/delta |
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405 | IF min(d0, max = ma) LE -2 THEN stop |
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406 | IF ma GT -1 THEN stop |
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407 | wx0 = imoms3(temporary(d0)) |
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408 | d1 = (alon[ilon ]-olon[short])/delta |
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409 | IF min(d1, max = ma) LE -1 THEN stop |
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410 | IF ma GT 0 THEN stop |
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411 | wx1 = imoms3(temporary(d1)) |
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412 | d2 = (alon[ilon+1L]-olon[short])/delta |
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413 | IF min(d2, max = ma) LE 0 THEN stop |
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414 | IF ma GT 1 THEN stop |
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415 | wx2 = imoms3(temporary(d2)) |
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416 | d3 = (alon[ilon+2L]-olon[short])/delta |
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417 | IF min(d3, max = ma) LE 1 THEN stop |
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418 | IF ma GT 2 THEN stop |
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419 | wx3 = imoms3(temporary(d3)) |
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420 | ENDIF ELSE BEGIN |
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421 | nele = n_elements(short) |
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422 | wx0 = fltarr(nele) |
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423 | wx1 = fltarr(nele) |
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424 | wx2 = fltarr(nele) |
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425 | wx3 = fltarr(nele) |
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426 | FOR i = 0L, nele-1 DO BEGIN |
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427 | IF i MOD 10000 EQ 0 THEN print, i |
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428 | newlon = spl_incr(alon[ilon[i]-1L:ilon[i]+2L], [-1., 0., 1., 2.], olon[short[i]]) |
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429 | IF newlon LE 0 THEN stop |
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430 | IF newlon GT 1 THEN stop |
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431 | wx0[i] = imoms3(newlon+1) |
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432 | wx1[i] = imoms3(newlon) |
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433 | wx2[i] = imoms3(1-newlon) |
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434 | wx3[i] = imoms3(2-newlon) |
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435 | ENDFOR |
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436 | ENDELSE |
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437 | ; |
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438 | mi = min(wx0+wx1+wx2+wx3, max = ma) |
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439 | IF abs(mi-1) GE 1.e-6 THEN stop |
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440 | IF abs(ma-1) GE 1.e-6 THEN stop |
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441 | ; line 1 |
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442 | xaddr[0, short] = ilon - 1L |
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443 | xaddr[1, short] = ilon |
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444 | xaddr[2, short] = ilon + 1L |
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445 | xaddr[3, short] = ilon + 2L |
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446 | yaddr[0:3, short] = 0 |
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447 | weig[0, short] = wx0 |
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448 | weig[1, short] = wx1 |
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449 | weig[2, short] = wx2 |
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450 | weig[3, short] = wx3 |
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451 | ; |
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452 | mi = min(total(weig[*, short], 1, /double), max = ma) |
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453 | IF abs(mi-1) GE 1.e-6 THEN stop |
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454 | IF abs(ma-1) GE 1.e-6 THEN stop |
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455 | ; |
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456 | ENDIF |
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457 | ; |
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458 | ; for the ocean points located above jpia-1 |
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459 | ; Interpolation only along the longitude |
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460 | ; |
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461 | short = where(indexlat EQ jpja-1L) |
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462 | IF short[0] NE -1 THEN BEGIN |
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463 | ilon = indexlon[short] |
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464 | ; |
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465 | IF NOT keyword_set(noregx) THEN BEGIN |
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466 | delta = alon[ilon]-alon[ilon-1L] |
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467 | IF max(abs(delta-delta[0])) GE 1.e-6 THEN stop |
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468 | delta = delta[0] |
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469 | ; |
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470 | d0 = (alon[ilon-1L]-olon[short])/delta |
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471 | IF min(d0, max = ma) LE -2 THEN stop |
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472 | IF ma GT -1 THEN stop |
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473 | wx0 = imoms3(temporary(d0)) |
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474 | d1 = (alon[ilon ]-olon[short])/delta |
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475 | IF min(d1, max = ma) LE -1 THEN stop |
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476 | IF ma GT 0 THEN stop |
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477 | wx1 = imoms3(temporary(d1)) |
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478 | d2 = (alon[ilon+1L]-olon[short])/delta |
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479 | IF min(d2, max = ma) LE 0 THEN stop |
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480 | IF ma GT 1 THEN stop |
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481 | wx2 = imoms3(temporary(d2)) |
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482 | d3 = (alon[ilon+2L]-olon[short])/delta |
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483 | IF min(d3, max = ma) LE 1 THEN stop |
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484 | IF ma GT 2 THEN stop |
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485 | wx3 = imoms3(temporary(d3)) |
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486 | ENDIF ELSE BEGIN |
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487 | nele = n_elements(short) |
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488 | wx0 = fltarr(nele) |
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489 | wx1 = fltarr(nele) |
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490 | wx2 = fltarr(nele) |
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491 | wx3 = fltarr(nele) |
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492 | FOR i = 0L, nele-1 DO BEGIN |
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493 | IF i MOD 10000 EQ 0 THEN print, i |
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494 | newlon = spl_incr(alon[ilon[i]-1L:ilon[i]+2L], [-1., 0., 1., 2.], olon[short[i]]) |
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495 | IF newlon LE 0 THEN stop |
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496 | IF newlon GT 1 THEN stop |
---|
497 | wx0[i] = imoms3(newlon+1) |
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498 | wx1[i] = imoms3(newlon) |
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499 | wx2[i] = imoms3(1-newlon) |
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500 | wx3[i] = imoms3(2-newlon) |
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501 | ENDFOR |
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502 | ENDELSE |
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503 | ; |
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504 | mi = min(wx0+wx1+wx2+wx3, max = ma) |
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505 | IF abs(mi-1) GE 1.e-6 THEN stop |
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506 | IF abs(ma-1) GE 1.e-6 THEN stop |
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507 | ; line 1 |
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508 | xaddr[0, short] = ilon-1L |
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509 | xaddr[1, short] = ilon |
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510 | xaddr[2, short] = ilon+1L |
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511 | xaddr[3, short] = ilon+2L |
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512 | yaddr[0:3, short] = jpja-1L |
---|
513 | weig[0, short] = wx0 |
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514 | weig[1, short] = wx1 |
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515 | weig[2, short] = wx2 |
---|
516 | weig[3, short] = wx3 |
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517 | ; |
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518 | mi = min(total(weig[*, short], 1, /double), max = ma) |
---|
519 | IF abs(mi-1) GE 1.e-6 THEN stop |
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520 | IF abs(ma-1) GE 1.e-6 THEN stop |
---|
521 | ; |
---|
522 | ENDIF |
---|
523 | ; |
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524 | ; Come back to the original index of atm grid without longitudinal overlap. |
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525 | ; |
---|
526 | ; |
---|
527 | xaddr = temporary(xaddr) - toadd |
---|
528 | jpia = jpia - 2*toadd |
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529 | ; make sure all values are ge 0 |
---|
530 | xaddr = temporary(xaddr) + jpia |
---|
531 | ; range the values between 0 and jpia-1 |
---|
532 | xaddr = temporary(xaddr) mod jpia |
---|
533 | ; |
---|
534 | ; take into account shiftx if needed |
---|
535 | IF shiftx NE 0 THEN xaddr = (temporary(xaddr) - shiftx) MOD jpia |
---|
536 | ; take into account nosouthernline and nonorthernline |
---|
537 | if keyword_set(nosouthernline) then BEGIN |
---|
538 | yaddr = temporary(yaddr) + 1L |
---|
539 | jpja = jpja + 1L |
---|
540 | ENDIF |
---|
541 | if keyword_set(nonorthernline) then jpja = jpja + 1L |
---|
542 | ; take into account revy if needed |
---|
543 | IF revy EQ 1 THEN yaddr = jpja - 1L - temporary(yaddr) |
---|
544 | ; ; |
---|
545 | addr = temporary(yaddr)*jpia+temporary(xaddr) |
---|
546 | ; |
---|
547 | RETURN |
---|
548 | END |
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