GrADS bugs on combining PDEF and FILEHEADER/THEADER

[Jennifer M. Adams]

Hi, Youhua --
Could you please send the binary file and a simple script that
illustrates the 'funny' values?
Jennifer



On Jan 30, 2007, at 8:21 AM, Youhua Tang wrote:

> Hi, All:
>
> I think I may find a bug about grads 1.9b4 on AIX when using
> PDEF and FILEHEADER/THEADER. My description file is
>
> dset /ptmp/wx20yt/premaq-20060802/aqm.t12z.grdcro2d.bin
> title 12km domain for CONUS
> undef  -9.99e-33
> PDEF 442 265 lcc 21.8212 -120.628 1 1 33 45 -97 12000. 12000.
> FILEHEADER 12844
> THEADER 48
> xdef 614 linear -133.459000 0.113383763365335
> ydef 290 linear 22.190000 0.110827272727273
> zdef 1 linear 1 1
> tdef 1 linear 12:00Z02AUG2006 1hr
> vars 6
> mlat 0 99 Longitude
> mlon 0 99 Latitude
> mf 0 99 squared map-scale factor (M/M)**2
> topo 0 99 TOPOGRAPH
> land 0 99 Landuse in USGS 25-Category
> purb 0 99 percent of urban category
> endvars
>
>
> I found grads did not read this file correctly as it showed some funny
> value. However, when I removed the PDEF and use native the grid,
>
> dset /ptmp/wx20yt/premaq-20060802/aqm.t12z.grdcro2d.bin
> title 12km domain for CONUS
> undef  -9.99e-33
> FILEHEADER 12844
> THEADER 48
> xdef 442 linear 1 1
> ydef 265 linear 1 1
> zdef 1 linear 1 1
> tdef 1 linear 12:00Z02AUG2006 1hr
> vars 6
> mlat 0 99 Longitude
> mlon 0 99 Latitude
> mf 0 99 squared map-scale factor (M/M)**2
> topo 0 99 TOPOGRAPH
> land 0 99 Landuse in USGS 25-Category
> purb 0 99 percent of urban category
> endvars
>
> then all value look correct just without map projection.
>
> To test it again, I also converted my binary files to NETCDF, and used
> grads read netcdf file. GrADS can read netcdf file correctly in both
> native grid and PDEF grid. So I think the problem is on the
> combination of
> PDEF and FILEHEADER/THEADER. The same bug is also found in GrADS
> 1.8sl11
> on AIX.
>
>
> Youhua
>

Jennifer M. Adams
IGES/COLA
4041 Powder Mill Road, Suite 302
Beltsville, MD 20705
jma at cola.iges.org



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