Re: Cross-section plot produced terrain height much lower than it has to be.

Dear Mary,

Thanks for your mail. I have added the codes as in your last mail in
my script. On executing the script, I got extra information as
follows,

(0) Working on time: 2013-02-15_18:00:00
(0) ymin_ter / ymax_ter = 800/6000
(0) ymin_tc / ymax_tc = 0/29
(0) ymin_rh / ymax_rh = 0/29
(0) ymin_tc2 / ymax_tc2 = 0/29
(0) ymin_rh2 / ymax_rh2 = 0/29
(0) ymin_vct / ymax_vct = 0/29
(0) Working on time: 2013-02-15_19:00:00
(0) ymin_ter / ymax_ter = 800/6000
(0) ymin_tc / ymax_tc = 0/29
(0) ymin_rh / ymax_rh = 0/29
(0) ymin_tc2 / ymax_tc2 = 0/29
(0) ymin_ to rh2 / ymax_rh2 = 0/29
(0) ymin_vct / ymax_vct = 0/29
(0) Working on time: 2013-02-15_20:00:00
(0) ymin_ter / ymax_ter = 800/6000
(0) ymin_tc / ymax_tc = 0/29
(0) ymin_rh / ymax_rh = 0/29
(0) ymin_tc2 / ymax_tc2 = 0/29
(0) ymin_rh2 / ymax_rh2 = 0/29
(0) ymin_vct / ymax_vct = 0/29

 The plot generated by the script has clearly mentioned that the
Potential Temperature contours : 298 to 317 by 1 but ymin_tc /
ymax_tc = 0/29.

Can you help to manage my codes ?

Sangeeta Maharjan.

On 10/1/13, Mary Haley <haley@ucar.edu> wrote:
> Dear Sangeeta,
>
> You have to be careful when using gsn_csm_xy to overlay an XY plot on WRF
> plots using wrf_overlays, because I believe wrf_overlays simply lines up the
> four corners of all of your plots, and doesn't do any kind of mathematical
> calculation to project the data from one plot into the space of another
> plot. wrf_overlays assumes that your plots already are in the exact same
> range as each other.
>
> When you create contour_ter using gsn_csm_xy, you need to make sure the Y
> axis min/max values (and ditto for the X axis values) are the same as they
> are for all of the other WRF contour plots. I see that you are sort of doing
> this using:
>
> opts_ter@trYMaxF = zmax*1000
>
> is zmax*1000 the exact value of upper Y limit of all your contour plots?
> What about the exact lower Y limit of all your plots? This needs to be the
> same as well
>
> You can verify what the trYMinF and trYMaxF values for all of your plots
> with this code:
>
> ;---Retrieve the Y limits for each plot and print them out
> getvalues contour_ter
> "trYMinF" : ymin_ter
> "trYMaxF" : ymax_ter
> end getvalues
> getvalues contour_tc
> "trYMinF" : ymin_tc
> "trYMaxF" : ymax_tc
> end getvalues
> getvalues contour_rh
> "trYMinF" : ymin_rh
> "trYMaxF" : ymax_rh
> end getvalues
> getvalues contour_tc2
> "trYMinF" : ymin_tc2
> "trYMaxF" : ymax_tc2
> end getvalues
> getvalues contour_rh2
> "trYMinF" : ymin_rh2
> "trYMaxF" : ymax_rh2
> end getvalues
> getvalues vector
> "trYMinF" : ymin_vct
> "trYMaxF" : ymax_vct
> end getvalues
>
> print("ymin_ter / ymax_ter = " + ymin_ter + "/" + ymax_ter)
> print("ymin_tc / ymax_tc = " + ymin_tc + "/" + ymax_tc)
> print("ymin_rh / ymax_rh = " + ymin_rh + "/" + ymax_rh)
> print("ymin_tc2 / ymax_tc2 = " + ymin_tc2 + "/" + ymax_tc2)
> print("ymin_rh2 / ymax_rh2 = " + ymin_rh2 + "/" + ymax_rh2)
> print("ymin_vct / ymax_vct = " + ymin_vct + "/" + ymax_vct)
>
> If these are not all the same, then your overlaid plots are going to be
> incorrect.
>
> --Mary
>
> On Sep 30, 2013, at 4:41 AM, sangeeta maharjan <sangeetamaharjan@gmail.com>
> wrote:
>
>> Dear ncl-users
>>
>> I used the wrf_CrossSection_add_smooth_terain4.ncl from Ncl Examples
>> Scripts available in the internet. I have made minor changes, adding
>> wind vector information and replaced temperature by potential
>> temperature. From generated plot , it is seen that the terrain plot
>> is fine but as we move to crosssection plot the height of the terrain
>> contour is much lower than it has be be.
>>
>> For eg, the terrain contour in between 27.6 to 29.9 must be around
>> 1350 m instead it only about 500 m.
>>
>> For your kind reference, I have attached the ncl script and generated
>> plot.
>>
>> I would appreciate any help on it.
>>
>> Thanks.
>> Sangeeta Maharjan.
>> <cros_sec_plot.pdf><practise_csection_pressure.ncl>_______________________________________________
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>
>
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Received on Mon Oct 7 01:17:35 2013