[gradsusr] Xdfopen radar netcdf doesn't show contours

[Jeff Duda]

The structure of DBZH looks kinda strange unless the "time" dimension
represents azimuth or a second spatial dimension. Otherwise it doesn't
appear that the data file contains a horizontal cross section (CAPPI) of
data. Given the description of DBZH I'm wondering if you will need to
pre-process the data to get it to write out to a horizontal cross section.

Jeff Duda



On Thu, Apr 5, 2018 at 4:23 AM, Andrew Friedman <andfried at gmail.com> wrote:

> Hi Michael,
>
> When you specify individual lat and lon values and display your data, does
> anything print?
>
> -Andrew
>
> > On Apr 5, 2018, at 10:02 AM, Michael Bala <ekimalab at gmail.com> wrote:
> >
> > Hi all,
> >
> > I'm trying to plot radar data using this descriptor file:
> >
> > dset ^TAG-20180405-051004-CAPPI-ZH.nc
> > title TAGAYTAY CAPPI
> > xdef range 1920 linear 118.8430168 0.00227
> > ydef range 1920 linear 11.9629298 0.00227
> > tdef time 360 linear 05Z04apr2018 1mn
> >
> >
> > When I try to display dbzh it prints out "Contouring: 15.6 to 17.4
> interval 0.2" but nothing shows on the map. So I'm thinking it must be
> outside of the lat lon that I defined. But I'm pretty sure my math's right.
> >
> > Here's the ncdump of the netcdf file:
> >
> > netcdf TAG-20180401-000004-CAPPI-ZH {
> > dimensions:
> >         time = 360 ;
> >         range = 1920 ;
> >         sweep = 1 ;
> >         string_length_sm = 10 ;
> >         string_length_md = 25 ;
> > variables:
> >         byte DBZH(time, range) ;
> >                 DBZH:standard_name = "equivalent_reflectivity_factor_h"
> ;
> >                 DBZH:units = "dBZ" ;
> >                 DBZH:_FillValue = 0b ;
> >                 DBZH:valid_min = 1b ;
> >                 DBZH:valid_max = -1b ;
> >                 DBZH:scale_factor = 0.5f ;
> >                 DBZH:add_offset = -32.f ;
> >                 DBZH:coordinates = "elevation azimuth range" ;
> >
> > // global attributes:
> >                 :Conventions = "Cf/Radial" ;
> >                 :title = "CAPPI" ;
> >                 :institution = "EEC" ;
> >                 :references = "EEC" ;
> >                 :source = "EDGE" ;
> >                 :history = "original" ;
> >                 :comment = "CAPPI" ;
> >                 :instrument_name = "TAG" ;
> >                 :site_name = "TAG" ;
> >                 :gates_vary = "false" ;
> > }
> >
> > latitude = 14.1421298980713 ;
> > longitude = 121.022216796875 ;
> >
> > Thanks in advance to anyone who'll share an answer.
> >
> >
> > Best regards,
> >
> > Michael Bala
> > Numerical Modeling Section
> > PAGASA
> >
> > _______________________________________________
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> > gradsusr at gradsusr.org
> > http://gradsusr.org/mailman/listinfo/gradsusr
>
>
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-- 
Jeff Duda, Research Scientist

University of Colorado Boulder

Cooperative Institute for Research in Environmental Sciences

NOAA/OAR/ESRL/Global Systems Division
Boulder, CO
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