| 1 | ;+ |
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| 2 | ; |
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| 3 | ; @file_comments |
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| 4 | ; Rather comparable to <pro>depth2level</pro> but here, the calculated level |
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| 5 | ; is in float. |
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| 6 | ; For example, the level 5.4 correspond to a depth equal |
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| 7 | ; to gdep[5]+.4*(gdep[6]-gdep[5]) |
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| 8 | ; |
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| 9 | ; @categories |
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| 10 | ; Without loop |
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| 11 | ; |
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| 12 | ; @param TAB {in}{required} |
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| 13 | ; 2d depth array (or a structure respecting <pro>litchamp</pro> criterion) |
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| 14 | ; |
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| 15 | ; @keyword NOMASK |
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| 16 | ; To do not mask land points |
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| 17 | ; |
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| 18 | ; @returns |
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| 19 | ; An 2d array of float containing levels's values. |
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| 20 | ; |
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| 21 | ; @uses |
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| 22 | ; common.pro |
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| 23 | ; |
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| 24 | ; @restrictions |
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| 25 | ; Accept values at !values.f_nan and mask land points at valmask. |
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| 26 | ; |
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| 27 | ; @examples |
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| 28 | ; IDL> a=(jpk-1)/(1.*jpi*jpj)*findgen(jpi,jpj) |
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| 29 | ; IDL> plt, 1e6*(a-floatlevel2depth(depth2floatlevel(a))),/nocontour |
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| 30 | ; |
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| 31 | ; ->champ nul a 1e-6 pres |
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| 32 | ; |
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| 33 | ; @history |
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| 34 | ; Sebastien Masson (smasson\@lodyc.jussieu.fr) |
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| 35 | ; 15/06/2000 |
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| 36 | ; |
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| 37 | ; @version |
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| 38 | ; $Id$ |
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| 39 | ; |
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| 40 | ;- |
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| 41 | FUNCTION depth2floatlevel, tab, NOMASK=nomask |
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| 42 | ; |
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| 43 | compile_opt idl2, strictarrsubs |
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| 44 | ; |
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| 45 | tempsun = systime(1) ; for key_performance |
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| 46 | @common |
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| 47 | ;------------------------------------------------------------ |
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| 48 | depthin = litchamp(tab) |
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| 49 | ; |
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| 50 | levelup = depth2level(depthin, /UPPER, /nomask) |
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| 51 | depthup = level2depth(levelup, /nomask) |
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| 52 | ; |
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| 53 | levellow = depth2level(depthin, /lower, /nomask) |
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| 54 | depthlow = level2depth(levellow, /nomask) |
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| 55 | ; calculate the distance depthlow-depthup and management of the case |
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| 56 | ; of this distance is null or equal to !values.f_nan |
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| 57 | divi = depthlow-depthup |
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| 58 | nan = where(finite(divi) EQ 0) |
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| 59 | if nan[0] NE -1 then divi[nan] = 0 |
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| 60 | nan = where(divi EQ 0) |
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| 61 | if nan[0] NE -1 then divi[nan] = !values.f_nan |
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| 62 | ; calculation of the result |
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| 63 | res = levelup+(depthin-depthup)/divi |
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| 64 | ; We mask land point at valmask |
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| 65 | if NOT keyword_set(nomask) then begin |
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| 66 | grille,mask |
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| 67 | if n_elements(valmask) EQ 0 then valmask = 1e20 |
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| 68 | terre = where((temporary(mask))[*, *, 0] EQ 0) |
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| 69 | if terre[0] NE -1 then res[terre] = valmask |
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| 70 | endif |
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| 71 | ;------------------------------------------------------------ |
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| 72 | if keyword_set(key_performance) THEN print, 'temps depth2floatlevel', systime(1)-tempsun |
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| 73 | ; |
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| 74 | return, res |
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| 75 | end |
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