| 1 | ;+ |
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| 2 | ; |
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| 3 | ; @file_comments |
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| 4 | ; compute the latitudes of the n48 gaussian grid. See: |
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| 5 | ; <a href="http://www.ecmwf.int/products/data/technical/gaussian/n48FIS.html">Gaussian 48</a> |
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| 6 | ; |
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| 7 | ; @categories |
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| 8 | ; Grid |
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| 9 | ; |
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| 10 | ; @examples |
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| 11 | ; IDL> lat=n48gaussian() |
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| 12 | ; |
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| 13 | ; @returns |
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| 14 | ; a 1d array |
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| 15 | ; |
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| 16 | ; @history |
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| 17 | ; Sebastien Masson (smasson\@lodyc.jussieu.fr) |
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| 18 | ; June 2004 |
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| 19 | ; |
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| 20 | ; @version |
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| 21 | ; $Id$ |
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| 22 | ; |
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| 23 | ;- |
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| 24 | FUNCTION n48gaussian |
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| 25 | ; |
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| 26 | compile_opt idl2, strictarrsubs |
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| 27 | ; |
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| 28 | ; latitude reduced regular latitude |
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| 29 | ; number points points |
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| 30 | ; ------- ------- ------- -------- |
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| 31 | n48 = [ 1, 20, 192, 88.57216, $ |
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| 32 | 2, 25, 192, 86.72253, $ |
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| 33 | 3, 36, 192, 84.86197, $ |
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| 34 | 4, 40, 192, 82.99894, $ |
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| 35 | 5, 45, 192, 81.13497, $ |
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| 36 | 6, 50, 192, 79.27055, $ |
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| 37 | 7, 60, 192, 77.40588, $ |
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| 38 | 8, 60, 192, 75.54106, $ |
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| 39 | 9, 72, 192, 73.67613, $ |
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| 40 | 10, 75, 192, 71.81113, $ |
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| 41 | 11, 80, 192, 69.94608, $ |
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| 42 | 12, 90, 192, 68.08099, $ |
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| 43 | 13, 96, 192, 66.21587, $ |
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| 44 | 14, 100, 192, 64.35073, $ |
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| 45 | 15, 108, 192, 62.48557, $ |
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| 46 | 16, 120, 192, 60.62039, $ |
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| 47 | 17, 120, 192, 58.75520, $ |
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| 48 | 18, 120, 192, 56.89001, $ |
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| 49 | 19, 128, 192, 55.02480, $ |
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| 50 | 20, 135, 192, 53.15959, $ |
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| 51 | 21, 144, 192, 51.29437, $ |
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| 52 | 22, 144, 192, 49.42915, $ |
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| 53 | 23, 160, 192, 47.56392, $ |
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| 54 | 24, 160, 192, 45.69869, $ |
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| 55 | 25, 160, 192, 43.83345, $ |
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| 56 | 26, 160, 192, 41.96822, $ |
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| 57 | 27, 160, 192, 40.10297, $ |
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| 58 | 28, 180, 192, 38.23773, $ |
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| 59 | 29, 180, 192, 36.37249, $ |
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| 60 | 30, 180, 192, 34.50724, $ |
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| 61 | 31, 180, 192, 32.64199, $ |
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| 62 | 32, 180, 192, 30.77674, $ |
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| 63 | 33, 192, 192, 28.91149, $ |
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| 64 | 34, 192, 192, 27.04623, $ |
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| 65 | 35, 192, 192, 25.18098, $ |
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| 66 | 36, 192, 192, 23.31573, $ |
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| 67 | 37, 192, 192, 21.45047, $ |
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| 68 | 38, 192, 192, 19.58521, $ |
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| 69 | 39, 192, 192, 17.71996, $ |
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| 70 | 40, 192, 192, 15.85470, $ |
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| 71 | 41, 192, 192, 13.98944, $ |
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| 72 | 42, 192, 192, 12.12418, $ |
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| 73 | 43, 192, 192, 10.25892, $ |
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| 74 | 44, 192, 192, 8.39366, $ |
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| 75 | 45, 192, 192, 6.52840, $ |
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| 76 | 46, 192, 192, 4.66314, $ |
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| 77 | 47, 192, 192, 2.79788, $ |
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| 78 | 48, 192, 192, 0.93262] |
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| 79 | ; |
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| 80 | n48 = reform(n48, 4, 48, /over) |
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| 81 | n48 = reform(n48[3, *], /over) |
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| 82 | n48 = [n48, -reverse(n48)] |
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| 83 | |
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| 84 | return, n48 |
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| 85 | end |
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