[ncl-talk] Map NETCDF classification NETCDF geofile in NC

[Rick Brownrigg]

Hi Siliang,

Please always post ncl-related questions to ncl-talk, as there is a broader
pool of expertise to draw from.

For the plot in general, I *think* example #2 might be very close to what
you want:

    http://ncl.ucar.edu/Applications/native.shtml

The shading is going to be tricker, as it looks like your data is
categorical, rather than a scalar field.  This link has several examples:

   http://ncl.ucar.edu/Applications/classification.shtml

particularly the "permafrost" example, which shows the use of explicit
contour levels and color assignments.

I hope that helps...
Rick


On Mon, Jun 15, 2020 at 11:34 PM lslrsgis at whu.edu.cn <lslrsgis at whu.edu.cn>
wrote:

> Dear Dr. Brownrigg,
>
> Thanks for your help on NCL last time. Sorry to bother you again, since
> the attachments oversized the limit of ncl-talk.
>
> I am wondering how to colormap this NETCDF geofile using NCL (see effects
> as Hangzhou.jpg attached). Since the original format GEOTIFF is not
> recognized by NCL, I convert it to NETCDF using gdal_translate.
>
> However, the lat/lon information is not given as grid dataset layer (like
> XLAT, XLONG in wrfout_d0*.nc) in Hangzhou.nc. The projection information
> are described as global properties, which can be shown through gdalinfo. I
> am wondering how to plot this with lat/long grid lines and correct
> projection?
>
> Thanks in advance,
>
> Best regards,
>
> Siliang
>
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