[gradsusr] Reading CMAQ netcdf files in GrADS

[Arlindo da Silva]

Hi John,

    Something tells me that you might know this. I have these CMAQ netcdf
files from the DISCOVER-AQ campaign (see ncdump below). Do you happen to
know the PDEF line that goes with these? I have the grid metrics in a
separate file, I could always write some code to remap these, but if grads
can do it on the fly it would be good enough for the exploratory data
analysis that I need to perform.

   Thanks,

       Arlindo

-----

netcdf UMA_AOD {
dimensions:
TSTEP = UNLIMITED ; // (48 currently)
DATE-TIME = 2 ;
LAY = 1 ;
VAR = 1 ;
ROW = 79 ;
COL = 112 ;
variables:
int TFLAG(TSTEP, VAR, DATE-TIME) ;
TFLAG:units = "<YYYYDDD,HHMMSS>" ;
TFLAG:long_name = "TFLAG           " ;
TFLAG:var_desc = "Timestep-valid flags:  (1) YYYYDDD or (2) HHMMSS
                       " ;
float AOD(TSTEP, LAY, ROW, COL) ;
AOD:long_name = "AOD             " ;
AOD:units = "unitless        " ;
AOD:var_desc = "AOD by Mie in VIS file
                     " ;

// global attributes:
:IOAPI_VERSION = "$Id: @(#) ioapi library version 3.0 $
                      " ;
:EXEC_ID = "????????????????
                 " ;
:FTYPE = 1 ;
:CDATE = 2011182 ;
:CTIME = 164809 ;
:WDATE = 2011182 ;
:WTIME = 164809 ;
:SDATE = 2011182 ;
:STIME = 130000 ;
:TSTEP = 10000 ;
:NTHIK = 1 ;
:NCOLS = 112 ;
:NROWS = 79 ;
:NLAYS = 1 ;
:NVARS = 1 ;
:GDTYP = 2 ;
:P_ALP = 33. ;
:P_BET = 45. ;
:P_GAM = -97. ;
:XCENT = -97. ;
:YCENT = 40. ;
:XORIG = 984000. ;
:YORIG = -384000. ;
:XCELL = 12000. ;
:YCELL = 12000. ;
:VGTYP = 1 ;
:VGTOP = 200.f ;
:VGLVLS = 1.f, 0.9959855f ;
:GDNAM = "AQF_CONUS_5x    " ;
:UPNAM = "setup           " ;
:VAR-LIST = "AOD             " ;
:FILEDESC = "hourly 1-layer cross-point Visibility Information



-- 
Arlindo da Silva
dasilva at alum.mit.edu
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