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