| 1 | ;+ |
|---|
| 2 | ; |
|---|
| 3 | ; @file_comments |
|---|
| 4 | ; Rather comparable to <pro>depth2level</pro> but here, the calculated level |
|---|
| 5 | ; is in float. |
|---|
| 6 | ; For example, the level 5.4 correspond to a depth equal |
|---|
| 7 | ; to gdep[5]+.4*(gdep[6]-gdep[5]) |
|---|
| 8 | ; |
|---|
| 9 | ; @categories |
|---|
| 10 | ; Without loop |
|---|
| 11 | ; |
|---|
| 12 | ; @param TAB {in}{required} |
|---|
| 13 | ; 2d depth array (or a structure respecting <pro>litchamp</pro> criterion) |
|---|
| 14 | ; |
|---|
| 15 | ; @keyword NOMASK |
|---|
| 16 | ; To do not mask land points |
|---|
| 17 | ; |
|---|
| 18 | ; @returns |
|---|
| 19 | ; An 2d array of float containing levels's values. |
|---|
| 20 | ; |
|---|
| 21 | ; @uses |
|---|
| 22 | ; <pro>common</pro> |
|---|
| 23 | ; |
|---|
| 24 | ; @restrictions |
|---|
| 25 | ; Accept values at !values.f_nan and mask land points at valmask. |
|---|
| 26 | ; |
|---|
| 27 | ; @examples |
|---|
| 28 | ; |
|---|
| 29 | ; IDL> a=(jpk-1)/(1.*jpi*jpj)*findgen(jpi,jpj) |
|---|
| 30 | ; IDL> plt, 1e6*(a-floatlevel2depth(depth2floatlevel(a))),/nocontour |
|---|
| 31 | ; |
|---|
| 32 | ; ->champ nul a 1e-6 pres |
|---|
| 33 | ; |
|---|
| 34 | ; @history |
|---|
| 35 | ; Sebastien Masson (smasson\@lodyc.jussieu.fr) |
|---|
| 36 | ; 15/06/2000 |
|---|
| 37 | ; |
|---|
| 38 | ; @version |
|---|
| 39 | ; $Id$ |
|---|
| 40 | ; |
|---|
| 41 | ;- |
|---|
| 42 | FUNCTION depth2floatlevel, tab, NOMASK=nomask |
|---|
| 43 | ; |
|---|
| 44 | compile_opt idl2, strictarrsubs |
|---|
| 45 | ; |
|---|
| 46 | tempsun = systime(1) ; for key_performance |
|---|
| 47 | @common |
|---|
| 48 | ;------------------------------------------------------------ |
|---|
| 49 | depthin = litchamp(tab) |
|---|
| 50 | ; |
|---|
| 51 | levelup = depth2level(depthin, /UPPER, /nomask) |
|---|
| 52 | depthup = level2depth(levelup, /nomask) |
|---|
| 53 | ; |
|---|
| 54 | levellow = depth2level(depthin, /lower, /nomask) |
|---|
| 55 | depthlow = level2depth(levellow, /nomask) |
|---|
| 56 | ; calculate the distance depthlow-depthup and management of the case |
|---|
| 57 | ; of this distance is null or equal to !values.f_nan |
|---|
| 58 | divi = depthlow-depthup |
|---|
| 59 | nan = where(finite(divi) EQ 0) |
|---|
| 60 | if nan[0] NE -1 then divi[nan] = 0 |
|---|
| 61 | nan = where(divi EQ 0) |
|---|
| 62 | if nan[0] NE -1 then divi[nan] = !values.f_nan |
|---|
| 63 | ; calculation of the result |
|---|
| 64 | res = levelup+(depthin-depthup)/divi |
|---|
| 65 | ; We mask land point at valmask |
|---|
| 66 | if NOT keyword_set(nomask) then begin |
|---|
| 67 | grille,mask |
|---|
| 68 | if n_elements(valmask) EQ 0 then valmask = 1e20 |
|---|
| 69 | terre = where((temporary(mask))[*, *, 0] EQ 0) |
|---|
| 70 | if terre[0] NE -1 then res[terre] = valmask |
|---|
| 71 | endif |
|---|
| 72 | ;------------------------------------------------------------ |
|---|
| 73 | if keyword_set(key_performance) THEN print, 'temps depth2floatlevel', systime(1)-tempsun |
|---|
| 74 | ; |
|---|
| 75 | return, res |
|---|
| 76 | end |
|---|
