Re: NCL read GOES images

From: Dennis Shea <shea_at_nyahnyahspammersnyahnyah>
Date: Wed Aug 01 2012 - 07:33:48 MDT

The file has issues. Specifically, the lat and lon have
bogus values

(0) min(lat)=-79.7354 max(lat)=2.14329e+09 <===
(0) min(lon)=-156.169 max(lon)=2.14329e+09 <===

%> ncdump -v lat,lon goes12.2008.328.024514.BAND_04.nc | less

         float data(time, yc, xc) ;
                 data:long_name = "0-255 Brightness Temperature" ;
                 data:type = "VISR" ;
                 data:coordinates = "lon lat" ;
         float lat(yc, xc) ;
                 lat:long_name = "lat" ;
                 lat:units = "degrees_north" ;
         float lon(yc, xc) ;
                 lon:long_name = "lon" ;
                 lon:units = "degrees_east" ;

There is no indication of a '_FillValue' or' missing_value' attribute
for lat, lon or data.

The data variable should have (I think)
         data@_FillValue = 255

A plot of this file is at:
         http://www.cgd.ucar.edu/~shea/goes12.2008.328.024514.BAND_04.png

More later.

On 8/1/12 5:14 AM, jorge.conrado@cptec.inpe.br wrote:
>
>
>
> Hi,
>
>
> Read an plot GOES images,
>
>
> The name o of GOES image is:
>
>
> goes12.2008.328.024514.BAND_04.nc.gz
>
>
> This image is on: /ftp.cgd.ucar.edu/incoming
>
>
> MY NCL version is: 6.0.0
>
>
> My system is:
>
>
> Linux coatiar 2.6.35.11-83.fc14.x86_64 #1 SMP Mon Feb 7
> 07:06:44 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux
>
>
>
> Best Regards,
>
>
> Conrado
>
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Received on Wed Aug 1 07:34:00 2012

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