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3<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
4  <head>
5    <title>compute_fromirr_bilinear_weigaddr.pro (SAXO Documentation Assistant)</title>
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55
56
57    <h1><font size="-2">Interpolation/</font></h1>
58    <h2>compute_fromirr_bilinear_weigaddr.pro</h2>
59
60    <dl>
61    </dl>
62
63   
64 compute the weight and address needed to interpolate data from
65 an "irregular 2D grid" (defined as a grid made of quadrilateral cells)
66 to any grid using the bilinear method
67
68
69   
70
71     
72      <a name="#_compute_fromirr_bilinear_weigaddr"></a>
73
74      <h2>compute_fromirr_bilinear_weigaddr  <font size="-1" color="#006633"> 
75 Interpolation
76</font></h2>
77
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>
79
80   
81
82   
83
84   
85    <h3>Parameters</h3>
86   
87
88    <a name="#_compute_fromirr_bilinear_weigaddr_keyword_olonin"></a>
89    <h4>olonin&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
90      <font size="-1" color="#006633">in</font>
91     
92     
93      <font size="-1" color="#006633">required</font>
94     
95     
96     
97     
98    </h4>
99
100   
101 longitude of the input data
102
103   
104
105    <a name="#_compute_fromirr_bilinear_weigaddr_keyword_olat"></a>
106    <h4>olat&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
107      <font size="-1" color="#006633">in</font>
108     
109     
110      <font size="-1" color="#006633">required</font>
111     
112     
113     
114     
115    </h4>
116
117   
118 latitude of the input data
119
120   
121
122    <a name="#_compute_fromirr_bilinear_weigaddr_keyword_omsk"></a>
123    <h4>omsk&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
124      <font size="-1" color="#006633">in</font>
125     
126     
127      <font size="-1" color="#006633">required</font>
128     
129     
130     
131     
132    </h4>
133
134   
135 land/sea mask of the input data
136
137   
138
139    <a name="#_compute_fromirr_bilinear_weigaddr_keyword_alonin"></a>
140    <h4>alonin&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
141      <font size="-1" color="#006633">in</font>
142     
143     
144      <font size="-1" color="#006633">required</font>
145     
146     
147     
148     
149    </h4>
150
151   
152 longitude of the output data
153
154   
155
156    <a name="#_compute_fromirr_bilinear_weigaddr_keyword_alat"></a>
157    <h4>alat&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
158      <font size="-1" color="#006633">in</font>
159     
160     
161      <font size="-1" color="#006633">required</font>
162     
163     
164     
165     
166    </h4>
167
168   
169 latitude of the output data
170
171   
172
173    <a name="#_compute_fromirr_bilinear_weigaddr_keyword_amsk"></a>
174    <h4>amsk&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
175      <font size="-1" color="#006633">in</font>
176     
177     
178      <font size="-1" color="#006633">required</font>
179     
180     
181     
182     
183    </h4>
184
185   
186 land/sea mask of the output data
187
188   
189
190    <a name="#_compute_fromirr_bilinear_weigaddr_keyword_weig"></a>
191    <h4>weig&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
192     
193      <font size="-1" color="#006633">out</font>
194     
195     
196     
197     
198     
199     
200    </h4>
201
202   
203   
204
205    <a name="#_compute_fromirr_bilinear_weigaddr_keyword_addr"></a>
206    <h4>addr&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
207     
208      <font size="-1" color="#006633">out</font>
209     
210     
211     
212     
213     
214     
215    </h4>
216
217   
218 2D arrays, weig and addr are the weight and addresses used to
219 perform the interpolation:
220  dataout = total(weig*datain[addr], 1)
221  dataout = reform(dataout, jpia, jpja, /over)
222
223   
224   
225
226   
227
228   
229    <h3>Version history</h3>
230   
231    <h4>Version</h4> $Id: compute_fromirr_bilinear_weigaddr.pro 157 2006-08-21 09:01:50Z navarro $
232
233    <h4>History</h4>
234  June 2006: Sebastien Masson (smasson@lodyc.jussieu.fr)
235
236   
237
238    <h3>Known issues</h3>
239   
240   
241   
242    <h4>Restrictions</h4>
243  -  the input grid must be an "irregular 2D grid", defined as a grid made
244  of quadrilateral cells which corners positions are defined with olonin and olat
245  -  We supposed the data are located on a sphere, with a periodicity along
246  the longitude
247  -  to perform the bilinear interpolation within quadrilateral cells, we
248  first morph the cell into a square cell and then compute the bilinear
249  interpolation.
250  -  if some corners of the cell are land points, their weight is set to 0
251  and the weight is redistributed on the remaining "water" corners
252  -  points located out of the southern and northern boundaries or in cells
253  containing only land points are set the the same value as their closest neighbor l
254
255
256   
257   
258   
259   
260   
261   
262   
263
264    <font size="-3"><p>&nbsp;</p></font>
265    <hr size="1" color="#CCCCCC"/>
266     
267
268   
269
270    <p><font color="gray" size="-3">&nbsp;&nbsp;Produced by IDLdoc 2.0 on Wed Sep  6 12:27:19 2006.</font></p>
271
272  </body>
273</html>
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