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| 5 | <title>compute_fromirr_bilinear_weigaddr.pro (SAXO Documentation Assistant)</title> |
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| 48 | <a href="clickincell.html"><img src="./../prev.gif" border="0" alt="Previous"></a></td> |
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| 49 | <td width="80%" align="center" valign="center"> |
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| 50 | <font size=-1><i>SAXO Documentation Assistant</i>: <a href="./../home.html">Overview</a></font></td> |
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| 51 | <td width="10%" align="right"> |
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| 53 | </tr> |
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| 54 | </table> |
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| 55 | |
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| 56 | |
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| 57 | <h1><font size="-2">Interpolation/</font></h1> |
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| 58 | <h2>compute_fromirr_bilinear_weigaddr.pro</h2> |
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| 59 | |
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| 60 | <dl> |
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| 61 | </dl> |
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| 62 | |
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| 63 | |
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| 64 | compute the weight and address needed to interpolate data from |
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| 65 | an "irregular 2D grid" (defined as a grid made of quadrilateral cells) |
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| 66 | to any grid using the bilinear method |
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| 67 | |
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| 68 | |
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| 69 | |
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| 70 | |
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| 71 | |
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| 72 | <a name="#_compute_fromirr_bilinear_weigaddr"></a> |
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| 73 | |
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| 74 | <h2>compute_fromirr_bilinear_weigaddr <font size="-1" color="#006633"> |
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| 75 | Interpolation |
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| 76 | </font></h2> |
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| 77 | |
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| 78 | <p><font face="Courier">compute_fromirr_bilinear_weigaddr<i>, <a href="#_compute_fromirr_bilinear_weigaddr_keyword_olonin">olonin</a>, <a href="#_compute_fromirr_bilinear_weigaddr_keyword_olat">olat</a>, <a href="#_compute_fromirr_bilinear_weigaddr_keyword_omsk">omsk</a>, <a href="#_compute_fromirr_bilinear_weigaddr_keyword_alonin">alonin</a>, <a href="#_compute_fromirr_bilinear_weigaddr_keyword_alat">alat</a>, <a href="#_compute_fromirr_bilinear_weigaddr_keyword_amsk">amsk</a>, <a href="#_compute_fromirr_bilinear_weigaddr_keyword_weig">weig</a>, <a href="#_compute_fromirr_bilinear_weigaddr_keyword_addr">addr</a></i></font></p> |
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| 79 | |
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| 80 | |
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| 81 | |
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| 82 | |
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| 83 | |
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| 84 | |
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| 85 | <h3>Parameters</h3> |
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| 86 | |
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| 87 | |
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| 88 | <a name="#_compute_fromirr_bilinear_weigaddr_keyword_olonin"></a> |
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| 89 | <h4>olonin |
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| 90 | <font size="-1" color="#006633">in</font> |
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| 91 | |
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| 92 | |
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| 93 | <font size="-1" color="#006633">required</font> |
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| 94 | |
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| 95 | <font size="-1" color="#006633">type:</font> <font size="-1" color="#006633"><i>2d array</i></font> |
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| 96 | |
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| 97 | |
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| 98 | </h4> |
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| 99 | |
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| 100 | |
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| 101 | longitude of the input data |
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| 102 | |
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| 103 | |
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| 104 | |
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| 105 | <a name="#_compute_fromirr_bilinear_weigaddr_keyword_olat"></a> |
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| 106 | <h4>olat |
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| 107 | <font size="-1" color="#006633">in</font> |
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| 108 | |
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| 109 | |
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| 110 | <font size="-1" color="#006633">required</font> |
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| 111 | |
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| 112 | <font size="-1" color="#006633">type:</font> <font size="-1" color="#006633"><i>2d array</i></font> |
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| 113 | |
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| 114 | |
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| 115 | </h4> |
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| 116 | |
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| 117 | |
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| 118 | latitude of the input data |
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| 119 | |
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| 120 | |
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| 121 | |
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| 122 | <a name="#_compute_fromirr_bilinear_weigaddr_keyword_omsk"></a> |
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| 123 | <h4>omsk |
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| 124 | <font size="-1" color="#006633">in</font> |
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| 125 | |
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| 126 | |
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| 127 | <font size="-1" color="#006633">required</font> |
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| 128 | |
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| 129 | <font size="-1" color="#006633">type:</font> <font size="-1" color="#006633"><i>2d array or -1</i></font> |
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| 130 | |
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| 131 | |
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| 132 | </h4> |
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| 133 | |
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| 134 | |
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| 135 | land/sea mask of the input data |
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| 136 | put -1 if input data are not masked |
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| 137 | |
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| 138 | |
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| 139 | |
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| 140 | <a name="#_compute_fromirr_bilinear_weigaddr_keyword_alonin"></a> |
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| 141 | <h4>alonin |
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| 142 | <font size="-1" color="#006633">in</font> |
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| 143 | |
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| 144 | |
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| 145 | <font size="-1" color="#006633">required</font> |
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| 146 | |
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| 147 | <font size="-1" color="#006633">type:</font> <font size="-1" color="#006633"><i>2d array</i></font> |
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| 148 | |
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| 149 | |
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| 150 | </h4> |
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| 151 | |
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| 152 | |
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| 153 | longitude of the output data |
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| 154 | |
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| 155 | |
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| 156 | |
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| 157 | <a name="#_compute_fromirr_bilinear_weigaddr_keyword_alat"></a> |
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| 158 | <h4>alat |
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| 159 | <font size="-1" color="#006633">in</font> |
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| 160 | |
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| 161 | |
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| 162 | <font size="-1" color="#006633">required</font> |
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| 163 | |
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| 164 | <font size="-1" color="#006633">type:</font> <font size="-1" color="#006633"><i>2d array</i></font> |
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| 165 | |
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| 166 | |
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| 167 | </h4> |
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| 168 | |
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| 169 | |
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| 170 | latitude of the output data |
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| 171 | |
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| 172 | |
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| 173 | |
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| 174 | <a name="#_compute_fromirr_bilinear_weigaddr_keyword_amsk"></a> |
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| 175 | <h4>amsk |
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| 176 | <font size="-1" color="#006633">in</font> |
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| 177 | |
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| 178 | |
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| 179 | <font size="-1" color="#006633">required</font> |
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| 180 | |
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| 181 | <font size="-1" color="#006633">type:</font> <font size="-1" color="#006633"><i>2d array or -1</i></font> |
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| 182 | |
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| 183 | |
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| 184 | </h4> |
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| 185 | |
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| 186 | |
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| 187 | land/sea mask of the output data |
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| 188 | put -1 if output data are not masked |
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| 189 | |
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| 190 | |
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| 191 | |
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| 192 | <a name="#_compute_fromirr_bilinear_weigaddr_keyword_weig"></a> |
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| 193 | <h4>weig |
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| 194 | |
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| 195 | <font size="-1" color="#006633">out</font> |
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| 196 | |
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| 197 | |
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| 198 | |
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| 199 | <font size="-1" color="#006633">type:</font> <font size="-1" color="#006633"><i>2d array</i></font> |
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| 200 | |
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| 201 | |
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| 202 | </h4> |
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| 203 | |
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| 204 | |
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| 205 | (see ADDR) |
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| 206 | |
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| 207 | |
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| 208 | |
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| 209 | <a name="#_compute_fromirr_bilinear_weigaddr_keyword_addr"></a> |
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| 210 | <h4>addr |
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| 211 | |
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| 212 | <font size="-1" color="#006633">out</font> |
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| 213 | |
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| 214 | |
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| 215 | |
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| 216 | <font size="-1" color="#006633">type:</font> <font size="-1" color="#006633"><i>2d array</i></font> |
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| 217 | |
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| 218 | |
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| 219 | </h4> |
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| 220 | |
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| 221 | |
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| 222 | 2D arrays, weig and addr are the weight and addresses used to |
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| 223 | perform the interpolation: |
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| 224 | dataout = total(weig*datain[addr], 1) |
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| 225 | dataout = reform(dataout, jpia, jpja, /over) |
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| 226 | |
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| 227 | |
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| 228 | |
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| 229 | |
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| 230 | |
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| 231 | |
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| 232 | |
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| 233 | <h3>Version history</h3> |
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| 234 | |
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| 235 | <h4>Version</h4> $Id: compute_fromirr_bilinear_weigaddr.pro 202 2007-01-12 11:00:06Z smasson $ |
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| 236 | |
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| 237 | <h4>History</h4> |
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| 238 | June 2006: Sebastien Masson (smasson@lodyc.jussieu.fr) |
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| 239 | |
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| 240 | |
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| 241 | |
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| 242 | <h3>Known issues</h3> |
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| 243 | |
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| 244 | |
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| 245 | |
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| 246 | <h4>Restrictions</h4> |
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| 247 | - the input grid must be an "irregular 2D grid", defined as a grid made |
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| 248 | of quadrilateral cells which corners positions are defined with olonin and olat |
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| 249 | - We supposed the data are located on a sphere, with a periodicity along |
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| 250 | the longitude |
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| 251 | - to perform the bilinear interpolation within quadrilateral cells, we |
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| 252 | first morph the cell into a square cell and then compute the bilinear |
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| 253 | interpolation. |
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| 254 | - if some corners of the cell are land points, their weight is set to 0 |
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| 255 | and the weight is redistributed on the remaining "water" corners |
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| 256 | - points located out of the southern and northern boundaries or in cells |
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| 257 | containing only land points are set the the same value as their closest neighbor |
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| 258 | |
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| 260 | |
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| 264 | |
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| 266 | |
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| 267 | |
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| 268 | <font size="-3"><p> </p></font> |
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| 269 | <hr size="1" color="#CCCCCC"/> |
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| 273 | |
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| 274 | <p><font color="gray" size="-3"> Produced by IDLdoc 2.0.</font></p> |
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| 275 | |
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| 276 | </body> |
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| 277 | </html> |
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