[110] | 1 | ;+ |
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| 2 | ; |
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| 3 | ; @file_comments interpolate data from an irregular 2D grid to any 2D grid. |
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| 4 | ; Only 1 metod available: bilinear |
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| 5 | ; |
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| 6 | ; @categories interpolation |
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| 7 | ; |
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| 8 | ; @examples |
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| 9 | ; dataout = fromirr(method, datain [, lonin, latin, mskin, lonout, latout, mskout]) |
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| 10 | ; |
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| 11 | ; @param method: {in}{required} a string defining the interpolation method. must be 'bilinear' |
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| 12 | ; @param datain: {in}{required} a 2D array the input data to interpolate |
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| 13 | ; @param lonin: {in}{optional} a 2D array defining the longitude of the input data |
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| 14 | ; optionals if WEIG and ADDR keywords used. |
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| 15 | ; @param latin: {in}{optional} a 2D array defining the latitude of the input data. |
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| 16 | ; optionals if WEIG and ADDR keywords used. |
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| 17 | ; @param mskin: {in}{optional} a 2D array, the land-sea mask of the input data (1 on ocean, 0 on land) |
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| 18 | ; @param lonout: {in}{optional} 1D or 2D array defining the longitude of the output data. |
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| 19 | ; optionals if WEIG and ADDR keywords used. |
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| 20 | ; @param latout: {in}{optional} 1D or 2D array defining the latitude of the output data. |
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| 21 | ; optionals if WEIG and ADDR keywords used. |
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| 22 | ; @param mskout: {in}{optional} a 2D array, the land-sea mask of the ouput data (1 on ocean, 0 on land) |
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| 23 | ; |
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| 24 | ; @keyword WEIG (see ADDR) |
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| 25 | ; @keyword ADDR: 2D arrays, weig and addr are the weight and addresses used to |
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| 26 | ; perform the interpolation: |
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| 27 | ; dataout = total(weig*datain[addr], 1) |
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| 28 | ; dataout = reform(dataout, jpio, jpjo, /over) |
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| 29 | ; Those keywords can be set to named variables into which the values will be |
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| 30 | ; copied when the current routine exits. Next, they can be used to perform |
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| 31 | ; the interpolation whithout computing again those 2 parameters. This greatly |
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| 32 | ; speed-up the interpolation! In that case, lonin, latin, lonout and latout are not necessary. |
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| 33 | ; |
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| 34 | ; @returns 2D array: the interpolated data |
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| 35 | ; |
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| 36 | ; @restrictions We supposed the data are located on a sphere, with a periodicity along |
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| 37 | ; the longitude. |
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| 38 | ; Note that the input data can contain the same cells several times |
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| 39 | ; (like ORCA grid near the north pole boundary) |
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| 40 | ; |
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| 41 | ; @examples |
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| 42 | ; |
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| 43 | ; tncep = fromirr('bilinear', topa, glamt, gphit, tmask[*,*,0], lonout, latout, mskout) |
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| 44 | ; |
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| 45 | ; or |
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| 46 | ; |
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| 47 | ; t1ncep = fromirr('bilinear', topa, glamt, gphit, tmask[*,*,0], lonout, latout, mskout $ |
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| 48 | ; , WEIG = a, ADDR = b) |
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| 49 | ; help, a, b |
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| 50 | ; t2ncep = fromirr('bilinear', topa, WEIG = a, ADDR = b) |
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| 51 | ; |
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| 52 | ; @history |
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| 53 | ; June 2006: Sebastien Masson (smasson\@lodyc.jussieu.fr) |
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| 54 | ; |
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| 55 | ;- |
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| 56 | ;---------------------------------------------------------- |
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| 57 | ;---------------------------------------------------------- |
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| 58 | ; |
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| 59 | FUNCTION fromirr, method, datain, lonin, latin, mskin, lonout, latout, mskout $ |
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| 60 | , WEIG = weig, ADDR = addr |
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| 61 | ; |
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| 62 | compile_opt strictarr, strictarrsubs |
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| 63 | ; |
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| 64 | IF NOT (keyword_set(weig) AND keyword_set(addr)) THEN BEGIN |
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| 65 | ;--------------- |
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| 66 | ; atmospheric grid parameters |
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| 67 | ;--------------- |
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| 68 | alon = lonin |
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| 69 | alat = latin |
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| 70 | get_gridparams, alon, alat, jpia, jpja, 2, /double |
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| 71 | ;--------------- |
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| 72 | ; Oceanic grid parameters |
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| 73 | ;--------------- |
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| 74 | olon = lonout |
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| 75 | olat = latout |
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| 76 | get_gridparams, olon, olat, jpio, jpjo, 2, /double |
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| 77 | ;--------------- |
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| 78 | ; Compute weight and address |
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| 79 | ;--------------- |
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| 80 | CASE method OF |
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| 81 | 'bilinear':compute_fromirr_bilinear_weigaddr, alon, alat, mskin, olon, olat, mskout, weig, addr |
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| 82 | ELSE:BEGIN |
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| 83 | print, ' unknown interpolation method... we stop' |
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| 84 | stop |
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| 85 | ENDELSE |
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| 86 | ENDCASE |
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| 87 | ENDIF |
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| 88 | ;--------------- |
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| 89 | ; to the interpolation |
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| 90 | ;--------------- |
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| 91 | dataout = total(weig*datain[addr], 1) |
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| 92 | dataout = reform(dataout, jpio, jpjo, /over) |
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| 93 | ; |
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| 94 | RETURN, dataout |
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| 95 | END |
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