[gradsusr] How to read Passive Microwave Water Cycle (PMWC) Dataset

[sushant puranik]

Hello simon
I already have tried to define the variable as
WVTU  1 99  WATER VAPOR TRANSPORT ZONAL COMPONENT      (MM M/S)

but it shows
Open Error:  Invalid variable record
  --> The invalid description file record is:
  --> wvtu      water vapor transport zonal component      (mm m/s)

About the levels they have not mentioned on there site. I will try to find
out the levels.

thank you


On Fri, Apr 16, 2010 at 2:17 PM, Simon Blessing
<simon.blessing at fastopt.de>wrote:

> Hi Sushant,
>
> I am not an expert in this, but it strikes me that your variable names
> contain hyphens ('-') and that you do not give any information about on
> how many levels the individual variables are defined. I am used to
> seeing something like
> ...
> vars 6
> WVTU  1 99  WATER VAPOR TRANSPORT ZONAL COMPONENT      (MM M/S)
> ...
> in the vars section.
> Hope this helps,
>
>  Simon
>
> On 04/16/2010 07:07 AM, sushant puranik wrote:
> > Hello
> > I am trying to read the Passive Microwave Water Cycle (PMWC) Dataset.
> Data
> > file is in .dat format and for that purpose i have made a ctl file. It
> looks
> > like
> >
> > The data files contain six 0.25-degree (1440x720) maps:
> > 1. Water Vapor Transport Speed
> > 2. Water Vapor Transport Direction
> > 3. Water Vapor Transport Divergence
> > 4. Evaporation
> > 5. Precipitation
> > 6. Water Vapor
> >
> > The maps are one byte with valid geophysical data falling between 0
> > and 250 with special values for: 252 = Sea Ice, 254 = Insufficient
> > Data, 255 = Land
> >
> > The scale factors and offsets are:
> > 1. Speed:         x 2.4,         to range between:  0 to  600 mm m/s
> > 2. Direction:     x 1.5,         to range between:  0 to  360 degrees
> > 3. Divergence:    x 0.024 - 3.0, to range between: -3 to    3 mm/hour
> > 4. Evaporation:   x 0.003,       to range between:  0 to 0.75 mm/hour
> > 5. Precipitation: x 0.012,       to range between:  0 to    3 mm/hour
> > 6. Water Vapor:   x 0.3,         to range between:  0 to   75 mm
> >
> > The water vapor transport direction is given in the oceanographic
> convention.
> >
> > The maps have:
> > Longitude = 0.25*xdim -  0.125 (degrees east)
> > Latitdue  = 0.25*ydim - 90.125
> > where
> > xdim goes from 1 to 1440 and
> > ydim goes from 1 to 720.
> >
> > And my ctl file is as
> >
> > dset /home/Sushant/Desktop/news_2006_05_pmwc_v01b.dat
> > title "TESTING"
> > undef 1e+20
> > xdef 1440 linear 0.125000 0.25
> > ydef 720 linear 90.125000 0.25
> > zdef 1 levels 1
> > tdef 31 linear 1may2006  24hr
> > vars 6
> > WVT-U     WATER VAPOR TRANSPORT ZONAL COMPONENT      (MM M/S)
> > WVT-V     WATER VAPOR TRANSPORT MERIDIONAL COMPONENT (MM M/S)
> > WVT-D     WATER VAPOR TRANSPORT DIVERGENCE           (MM/HOUR)
> > EVAP     EVAPORATION                                (MM/HOUR)
> > PRCP      PRECIPITATION                              (MM/HOUR)
> > WVAP      COLUMNAR WATER VAPOR                       (MM)
> > endvars
> >
> > but in GrADS it shows following error
> >
> > ga-> open /home/Sushant/Desktop/wvdata.ctl
> > Scanning description file:  /home/Sushant/Desktop/wvdata.ctl
> > Open Error:  Invalid variable record
> >   --> The invalid description file record is:
> >   --> wvt-u     water vapor transport zonal component      (mm m/s)
> >
> >   The data file was not opened.
> >
> >
> > Can anyone came across such a problem?
> >
> > suggestions are appreciated
> >
> >
> >
> > Thank you
> >
> > Sushant
> >
> >
> >
> >
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>
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