1 | ;------------------------------------------------------------ |
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2 | ;------------------------------------------------------------ |
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3 | ;------------------------------------------------------------ |
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4 | ;+ |
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5 | ; @file_comments |
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6 | ; Rather comparable to depth2level but here, the calculated level is in float. |
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7 | ; For example, the level 5.4 correspond to a depth equal |
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8 | ; to gdep[5]+.4*(gdep[6]-gdep[5]) |
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9 | ; |
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10 | ; @categories |
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11 | ; Without loop |
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12 | ; |
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13 | ; @param TAB {in}{required} |
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14 | ; 2d depth array (or a structure respecting litchamp criterion) |
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15 | ; |
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16 | ; @keyword NOMASK |
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17 | ; To do not mask land points |
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18 | ; |
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19 | ; @returns |
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20 | ; An 2d array of float containing levels's values. |
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21 | ; |
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22 | ; @uses |
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23 | ; common.pro |
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24 | ; |
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25 | ; @restrictions |
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26 | ; Accept values at !values.f_nan and mask land points at valmask. |
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27 | ; |
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28 | ; @examples |
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29 | ; IDL> a=(jpk-1)/(1.*jpi*jpj)*findgen(jpi,jpj) |
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30 | ; IDL> plt, 1e6*(a-floatlevel2depth(depth2floatlevel(a))),/nocontour |
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31 | ; |
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32 | ; ->champ nul a 1e-6 pres |
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33 | ; |
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34 | ; @history |
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35 | ; Sebastien Masson (smasson\@lodyc.jussieu.fr) |
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36 | ; 15/06/2000 |
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37 | ; |
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38 | ; @version |
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39 | ; $Id$ |
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40 | ; |
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41 | ;- |
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42 | ;------------------------------------------------------------ |
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43 | ;------------------------------------------------------------ |
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44 | ;------------------------------------------------------------ |
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45 | FUNCTION depth2floatlevel, tab, NOMASK = nomask |
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46 | ; |
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47 | compile_opt idl2, strictarrsubs |
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48 | ; |
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49 | tempsun = systime(1) ; for key_performance |
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50 | @common |
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51 | ;------------------------------------------------------------ |
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52 | depthin = litchamp(tab) |
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53 | ; |
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54 | levelup = depth2level(depthin, /UPPER, /nomask) |
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55 | depthup = level2depth(levelup, /nomask) |
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56 | ; |
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57 | levellow = depth2level(depthin, /lower, /nomask) |
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58 | depthlow = level2depth(levellow, /nomask) |
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59 | ; calculate the distance depthlow-depthup and management of the case |
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60 | ; of this distance is null or eqal to !values.f_nan |
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61 | divi = depthlow-depthup |
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62 | nan = where(finite(divi) EQ 0) |
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63 | if nan[0] NE -1 then divi[nan] = 0 |
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64 | nan = where(divi EQ 0) |
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65 | if nan[0] NE -1 then divi[nan] = !values.f_nan |
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66 | ; calculation of the result |
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67 | res = levelup+(depthin-depthup)/divi |
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68 | ; We mask land point at valmask |
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69 | if NOT keyword_set(nomask) then begin |
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70 | grille,mask |
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71 | if n_elements(valmask) EQ 0 then valmask = 1e20 |
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72 | terre = where((temporary(mask))[*, *, 0] EQ 0) |
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73 | if terre[0] NE -1 then res[terre] = valmask |
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74 | endif |
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75 | ;------------------------------------------------------------ |
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76 | if keyword_set(key_performance) THEN print, 'temps depth2floatlevel', systime(1)-tempsun |
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77 | ; |
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78 | return, res |
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79 | end |
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