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| 48 | <a href="fromirr.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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| 52 | <a href="get_gridparams.html"><img src="./../next.gif" border="0" alt="Next"></a></td> |
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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>fromreg.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 | interpolate data from a "regular/rectangular grid" to any grid. |
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[402] | 65 | |
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| 66 | 2 methods available: bilinear and imoms3 |
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| 67 | |
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| 68 | A "regular/rectangular grid" is defined as a grid for which |
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| 69 | |
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| 70 | Each longitude lines have the same latitude and each latitude columns |
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[242] | 71 | have the same longitude. |
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[163] | 72 | |
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| 73 | |
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| 74 | |
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| 75 | |
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| 76 | |
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| 77 | <a name="#_fromreg"></a> |
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| 78 | |
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| 79 | <h2>fromreg <font size="-1" color="#006633"> |
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| 80 | Interpolation |
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| 81 | </font></h2> |
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| 82 | |
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[290] | 83 | <p><font face="Courier"><i>result = </i>fromreg(<i><a href="#_fromreg_keyword_method">method</a>, <a href="#_fromreg_keyword_datain">datain</a>, <a href="#_fromreg_keyword_lonin">lonin</a>, <a href="#_fromreg_keyword_latin">latin</a>, <a href="#_fromreg_keyword_lonout">lonout</a>, <a href="#_fromreg_keyword_latout">latout</a></i>, <a href="#_fromreg_keyword_WEIG">WEIG</a>=<i>2d array or variable name</i>, <a href="#_fromreg_keyword_ADDR">ADDR</a>=<i>2d array or variable name</i>, <a href="#_fromreg_keyword_NONORTHERNLINE">NONORTHERNLINE</a>=<i>NONORTHERNLINE</i>, <a href="#_fromreg_keyword_NOSOUTHERNLINE">NOSOUTHERNLINE</a>=<i>NOSOUTHERNLINE</i>, <a href="#_fromreg_keyword__EXTRA">_EXTRA</a>=<i>_EXTRA</i>)</font></p> |
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[163] | 84 | |
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| 85 | |
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| 86 | |
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| 87 | |
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| 88 | <h3>Return value</h3> |
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| 89 | 2D array the interpolated data |
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| 90 | |
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| 91 | |
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| 92 | |
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| 93 | <h3>Parameters</h3> |
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| 94 | |
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| 95 | |
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| 96 | <a name="#_fromreg_keyword_method"></a> |
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| 97 | <h4>method |
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| 98 | <font size="-1" color="#006633">in</font> |
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| 99 | |
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| 100 | |
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| 101 | <font size="-1" color="#006633">required</font> |
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| 102 | |
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| 103 | <font size="-1" color="#006633">type:</font> <font size="-1" color="#006633"><i>string</i></font> |
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| 104 | |
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| 105 | |
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| 106 | </h4> |
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| 107 | |
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| 108 | |
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[242] | 109 | the interpolation method. |
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[163] | 110 | must be 'bilinear' or 'imoms3' |
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| 111 | |
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| 112 | |
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| 113 | |
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| 114 | <a name="#_fromreg_keyword_datain"></a> |
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| 115 | <h4>datain |
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| 116 | <font size="-1" color="#006633">in</font> |
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| 117 | |
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| 118 | |
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| 119 | <font size="-1" color="#006633">required</font> |
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| 120 | |
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| 121 | <font size="-1" color="#006633">type:</font> <font size="-1" color="#006633"><i>2d array</i></font> |
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| 122 | |
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| 123 | |
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| 124 | </h4> |
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| 125 | |
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| 126 | |
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[242] | 127 | the input data to interpolate |
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[163] | 128 | |
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| 129 | |
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| 130 | |
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| 131 | <a name="#_fromreg_keyword_lonin"></a> |
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| 132 | <h4>lonin |
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| 133 | <font size="-1" color="#006633">in</font> |
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| 134 | |
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| 135 | |
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[210] | 136 | <font size="-1" color="#006633">required</font> |
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[163] | 137 | |
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| 138 | <font size="-1" color="#006633">type:</font> <font size="-1" color="#006633"><i>1d or 2d array</i></font> |
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| 139 | |
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| 140 | |
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| 141 | </h4> |
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| 142 | |
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| 143 | |
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[242] | 144 | the longitude of the input data |
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[163] | 145 | |
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| 146 | |
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| 147 | |
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| 148 | <a name="#_fromreg_keyword_latin"></a> |
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| 149 | <h4>latin |
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| 150 | <font size="-1" color="#006633">in</font> |
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| 151 | |
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| 152 | |
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[210] | 153 | <font size="-1" color="#006633">required</font> |
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[163] | 154 | |
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| 155 | <font size="-1" color="#006633">type:</font> <font size="-1" color="#006633"><i>1d or 2d array</i></font> |
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| 156 | |
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| 157 | |
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| 158 | </h4> |
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| 159 | |
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| 160 | |
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[242] | 161 | the latitude of the input data |
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[163] | 162 | |
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| 163 | |
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| 164 | |
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| 165 | <a name="#_fromreg_keyword_lonout"></a> |
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| 166 | <h4>lonout |
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| 167 | <font size="-1" color="#006633">in</font> |
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| 168 | |
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| 169 | |
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[210] | 170 | <font size="-1" color="#006633">required</font> |
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[163] | 171 | |
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| 172 | <font size="-1" color="#006633">type:</font> <font size="-1" color="#006633"><i>1d or 2d array</i></font> |
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| 173 | |
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| 174 | |
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| 175 | </h4> |
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| 176 | |
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| 177 | |
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[242] | 178 | the longitude of the output data |
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[163] | 179 | |
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| 180 | |
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| 181 | |
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| 182 | <a name="#_fromreg_keyword_latout"></a> |
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| 183 | <h4>latout |
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| 184 | <font size="-1" color="#006633">in</font> |
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| 185 | |
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| 186 | |
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| 187 | <font size="-1" color="#006633">required</font> |
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| 188 | |
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| 189 | <font size="-1" color="#006633">type:</font> <font size="-1" color="#006633"><i>1d or 2d array</i></font> |
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| 190 | |
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| 191 | |
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| 192 | </h4> |
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| 193 | |
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| 194 | |
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[242] | 195 | the latitude of the output data |
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[163] | 196 | |
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| 197 | |
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| 198 | |
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| 199 | |
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| 200 | |
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| 201 | <h3>Keywords</h3> |
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| 202 | |
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| 203 | |
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| 204 | <a name="#_fromreg_keyword_WEIG"></a> |
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| 205 | <h4>WEIG |
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| 206 | |
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| 207 | |
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| 208 | |
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| 209 | |
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| 210 | |
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[234] | 211 | <font size="-1" color="#006633">type:</font> <font size="-1" color="#006633"><i>2d array or variable name</i></font> |
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[163] | 212 | |
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| 213 | |
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| 214 | </h4> |
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| 215 | |
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| 216 | |
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| 217 | (see ADDR) |
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| 218 | |
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| 219 | |
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| 220 | <a name="#_fromreg_keyword_ADDR"></a> |
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| 221 | <h4>ADDR |
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| 222 | |
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| 223 | |
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| 224 | |
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| 225 | |
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| 226 | |
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[234] | 227 | <font size="-1" color="#006633">type:</font> <font size="-1" color="#006633"><i>2d array or variable name</i></font> |
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[163] | 228 | |
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| 229 | |
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| 230 | </h4> |
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| 231 | |
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| 232 | |
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[234] | 233 | 1) at the first call of fromreg: |
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| 234 | This keyword can be set to a named variable (undefined or equal to 0) into which the |
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| 235 | addresses used to perform the interpolation will be copied when the current routine exits. |
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| 236 | 2) Next, once this keyword is set to a defined 2d array, it is used to bypass the computation |
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| 237 | of the weights and addresses used to perform the interpolation. In this case, fromreg simply |
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| 238 | compute the interpolated field as: |
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[163] | 239 | dataout = total(weig*datain[addr], 1) |
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| 240 | dataout = reform(dataout, jpio, jpjo, /over) |
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[402] | 241 | |
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[234] | 242 | In that case, method, lonin, latin, are not used (but are necessary). |
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| 243 | lonout, latout are used only to know the output domain size |
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[163] | 244 | |
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| 245 | |
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| 246 | <a name="#_fromreg_keyword_NONORTHERNLINE"></a> |
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| 247 | <h4>NONORTHERNLINE |
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| 248 | |
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| 249 | |
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| 250 | |
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| 251 | |
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| 252 | |
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| 253 | |
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| 254 | |
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| 255 | |
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| 256 | </h4> |
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| 257 | |
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| 258 | |
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| 259 | activate if you don't want to take into account the northern line |
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| 260 | of the input data when performing the interpolation. |
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| 261 | |
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| 262 | |
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| 263 | <a name="#_fromreg_keyword_NOSOUTHERNLINE"></a> |
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| 264 | <h4>NOSOUTHERNLINE |
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| 265 | |
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| 266 | |
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| 267 | |
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| 268 | |
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| 269 | |
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| 270 | |
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| 271 | |
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| 272 | |
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| 273 | </h4> |
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| 274 | |
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| 275 | |
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| 276 | activate if you don't want to take into account the southern line |
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| 277 | of the input data when performing the interpolation. |
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| 278 | |
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| 279 | |
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[290] | 280 | <a name="#_fromreg_keyword__EXTRA"></a> |
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| 281 | <h4>_EXTRA |
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| 282 | |
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| 283 | |
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| 284 | |
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| 285 | |
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| 286 | |
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| 287 | |
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| 288 | |
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| 289 | |
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| 290 | </h4> |
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| 291 | |
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| 292 | to be able to call fromreg with _extra keyword |
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| 293 | |
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[163] | 294 | |
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[290] | 295 | |
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[163] | 296 | |
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[234] | 297 | <h3>Examples</h3><pre> |
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[163] | 298 | |
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[234] | 299 | To interpolate 1 field: |
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| 300 | |
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[402] | 301 | IDL> topa = fromreg('bilinear', tncep, xncep, yncep, glamt, gphit) |
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[163] | 302 | |
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[234] | 303 | or if you have several fields to interpolate from the same source and target grids |
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| 304 | |
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| 305 | 1) get back the weights and addresses in variables a and b |
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[242] | 306 | (that must be undefined or equal to 0 before calling fromreg |
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[163] | 307 | |
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[402] | 308 | IDL> t1opa = fromreg('bilinear', t1ncep, xncep, yncep, glamt, gphit, WEIG = a, ADDR = b) |
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| 309 | IDL> help, a, b |
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[163] | 310 | |
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[234] | 311 | 2) use a and b that are now defined to bypass the computation of the weights and addresses |
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| 312 | and speed-up the computation! |
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| 313 | |
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[402] | 314 | IDL> t2opa = fromreg('bilinear', t2ncep, xncep, yncep, glamt, gphit, WEIG = a, ADDR = b) |
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[234] | 315 | |
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| 316 | </pre><h3>Version history</h3> |
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[163] | 317 | |
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[234] | 318 | <h4>Version</h4> |
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[402] | 319 | $Id: fromreg.pro 372 2008-08-08 12:31:53Z pinsard $ |
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[163] | 320 | |
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| 321 | <h4>History</h4> |
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| 322 | November 2005: Sebastien Masson (smasson@lodyc.jussieu.fr) |
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| 323 | |
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| 324 | |
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| 325 | |
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| 326 | <h3>Known issues</h3> |
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| 327 | |
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| 328 | |
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| 329 | |
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| 330 | <h4>Restrictions</h4> |
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| 331 | We supposed the data are located on a sphere, with a periodicity along the |
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| 332 | longitude. |
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| 333 | |
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| 334 | |
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| 342 | |
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| 343 | <font size="-3"><p> </p></font> |
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| 344 | <hr size="1" color="#CCCCCC"/> |
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[187] | 349 | <p><font color="gray" size="-3"> Produced by IDLdoc 2.0.</font></p> |
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[163] | 350 | |
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| 351 | </body> |
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[249] | 352 | </html> |
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