[ncl-talk] reading binary file

[Debasish Hazra]

Thanks Dennis. Only information I got that
"viirs_meandbdi_gridded_statis2015032.dat" is a mean-dbdi value in a grid
box (so it is different than the 2013 file I sent, which was not just a
mean in grid box).

 Also. the text information says to read in IDL like :

 lat_resolution=0.25
lon_resolution=0.25
nlat1=fix(180.0/lat_resolution)
nlon1=fix(360.0/lon_resolution)
latt=fltarr(nlat1+1)
lonn=fltarr(nlon1+1)
print, nlat1,nlon1

for i=0,nlat1 do begin
  latt(i)=-90+i*lat_resolution
endfor
for i=0,nlon1 do begin
  lonn(i)=-180+i*lon_resolution
endfor

 mean_dbdi=dblarr(nlon1,nlat1)
mean_dbdi(*,*)=-999.9d

openr,1,'viirs_meandbdi_gridded_statis'+yrday+'.dat'
readu,1,mean_dbdi
close,1

Any suggestion/help on this.

Thanks,
 Debasish



On Fri, Jun 19, 2015 at 9:14 AM, Dennis Shea <shea at ucar.edu> wrote:

> The files you sent re two different sizes (bytes):
>
>   20736000 Jun 19 06:55 viirs_dbdi_gridded_statis2013212.dat
>     8294400 Jun 19 06:55 viirs_meandbdi_gridded_statis2015032.dat
>
> Your read code:
>
>        setfileoption("bin","readbyteorder","bigendian")
>        var1 = 1e-9 *
> tofloat(cbinread("./Feb/viirs_meandbdi_gridded_statis2015032.dat",(/5,720,1440/),"uint"))
>        var2 = 1e-9 *
> tofloat(cbinread("./Jul/viirs_dbdi_gridded_statis2013212.dat",(/5,720,1440/),"uint"))
>
> indicates the two files should be the same sizes
>
>       N = 5*720*1440*4    ; 4 bytes per integer
>
>       N = 20736000
>
> So something is wrong with the viirs_meandbdi_gridded_statis2015032.dat
> file
>
>
>
>
> On Thu, Jun 18, 2015 at 2:28 PM, Debasish Hazra <debasish.hazra5 at gmail.com
> > wrote:
>
>> Hi,
>>
>>  I need some help reading binary files with ncl (version 6.3). I have
>> attached the code and the resulting plot from the files. Print statement
>> shows minimum and maximum value for the first file (1st feb, 2015) , but in
>> the resulting figure field it is completely empty without showing any error
>> message. Let me know how to resolve this.
>>
>>  Both files  (gridded_statis2013212.dat and gridded_statis2015032.dat)
>> are uploaded in the ftp.
>>
>> Thanks and regards,
>>  Debasish
>>
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