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

[Simon Blessing]

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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