| 1 | ;------------------------------------------------------------ |
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| 2 | ;------------------------------------------------------------ |
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| 3 | ;------------------------------------------------------------ |
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| 4 | ;+ |
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| 5 | ; NAME:read_oasis |
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| 6 | ; |
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| 7 | ; PURPOSE:read the f77 unformated files used in Oasis (version < 2.5) |
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| 8 | ; |
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| 9 | ; CATEGORY:reading |
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| 10 | ; |
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| 11 | ; CALLING SEQUENCE: z2d=read_oasis(filename, varname, jpi, jpj) |
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| 12 | ; |
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| 13 | ; INPUTS: |
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| 14 | ; filename:the filename |
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| 15 | ; varname: the name of the variable to be read |
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| 16 | ; jpi and jpj the size of the 2d array to be read |
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| 17 | ; |
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| 18 | ; KEYWORD PARAMETERS: |
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| 19 | ; /I2, /I4, /I8, /R4: to change the defaut format (R8) of the data to |
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| 20 | ; be read. |
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| 21 | ; |
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| 22 | ; OUTPUTS:a 2d array |
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| 23 | ; |
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| 24 | ; COMMON BLOCKS: |
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| 25 | ; |
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| 26 | ; SIDE EFFECTS: |
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| 27 | ; |
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| 28 | ; RESTRICTIONS: |
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| 29 | ; |
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| 30 | ; EXAMPLE: |
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| 31 | ; IDL> a=read_oasis('grids_orca_t106','a106.lon',320,160) |
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| 32 | ; IDL> m=read_oasis('masks_orca_t106','or1t.msk',182,149,/i4) |
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| 33 | ; |
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| 34 | ; see also IDL> scanoasis,'grids_orca_t106' |
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| 35 | ; |
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| 36 | ; MODIFICATION HISTORY:Sebastien Masson (smasson@lodyc.jussieu.fr) |
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| 37 | ; July 01, 2002 |
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| 38 | ;- |
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| 39 | ;------------------------------------------------------------ |
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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 | FUNCTION read_oasis, filename, varname, jpi, jpj, I2, I4 = i4, I8 = i8, R4 = r4 |
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| 45 | |
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| 46 | openr, unit, filename, /f77_unformatted, /get_lun, /swap_if_little_endian $ |
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| 47 | , error=err |
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| 48 | if err ne 0 then begin |
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| 49 | print,!err_string |
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| 50 | return, -1 |
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| 51 | endif |
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| 52 | |
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| 53 | char8 = '12345678' |
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| 54 | readu, unit, char8 |
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| 55 | ; print, char8 |
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| 56 | found = char8 EQ varname |
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| 57 | |
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| 58 | WHILE NOT EOF(unit) AND found NE 1 DO BEGIN |
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| 59 | readu, unit |
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| 60 | if EOF(unit) then begin |
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| 61 | print, varname+' not found in '+filename |
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| 62 | return, -1 |
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| 63 | endif |
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| 64 | readu, unit, char8 |
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| 65 | ; print, char8 |
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| 66 | found = char8 EQ varname |
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| 67 | ENDWHILE |
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| 68 | case 1 of |
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| 69 | keyword_set(i2):res = intarr(jpi, jpj) |
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| 70 | keyword_set(i4):res = lonarr(jpi, jpj) |
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| 71 | keyword_set(i8):res = lon64arr(jpi, jpj) |
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| 72 | keyword_set(r4):res = fltarr(jpi, jpj) |
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| 73 | ELSE:res = dblarr(jpi, jpj) |
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| 74 | endcase |
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| 75 | |
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| 76 | readu, unit, res |
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| 77 | |
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| 78 | free_lun,unit |
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| 79 | |
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| 80 | return, res |
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| 81 | end |
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