[ncl-talk] Zooming in WRF plot

[Mary Haley]

Hi Ronald,

Rick is right that wrf_map_resources is the issue.

The sole purpose of wrf_map_resources is to look at your WRF file and set
all the necessary mpXXXX resources needed to plot the data on the
*original* WRF map projection defined on the file. It assumes you are
plotting the full WRF data, unless you set the special "ZoomIn" attribute
along with the Xstart / Xend / Ystart / Yend attributes.

For examples on how to zoom in on WRF data, see:

http://www.ncl.ucar.edu/Applications/wrfzoom.shtml

In particular, if you want to zoom in on the data using a min/max lat/lon
value like you were doing with the script you attached, then look at
example wrf_zoom_3.ncl which shows how to do this. You cannot use
wrf_map_resources in this case. The example explains more about this.

If you want to use the WRF map projection defined on the file, but zoom in
on it, then see example wrf_zoom_1.ncl on the above page.

Good luck,

--Mary




On Thu, Feb 22, 2018 at 9:41 AM, Rick Brownrigg <brownrig at ucar.edu> wrote:

> Hi Ronald,
>
> This is sheer speculation on my part, but it may be that the call to
> wrf_map_resources() is resetting the mpMin/Max/Lat/Lon resources to the
> full extent of the file.  You might try printing "res" after the call to
> the function to verify, and if this is the case, the fix obviously is to
> move the lines setting the extent you want to after the call.
>
> Hope that helps...
> Rick
>
> On Thu, Feb 22, 2018 at 9:27 AM, Ronald Opio <opioronald123 at gmail.com>
> wrote:
>
>> Hello colleagues.
>>
>> I am trying to zoom in a WRF plot to look like a TRMM rainfall plot that
>> I have but its failing. How can I solve this problem.
>>
>> Here is my script plus the two plots and the TRMM file. I have not
>> attached the WRF file because its a bit heavy.
>>
>>
>>
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