[ncl-talk] Hovmueller plot, x axis range adjustment

Fri Aug 31 17:33:53 MDT 2018

Hi Toni,
Yes, there's a few ways you can go about it, but the one that gives you the
most control is the tmXBMode/tmXBValues/tmXBLabels resources:
  data_00&lon_zones at units = "degrees_east"   ; needed to set units of
lon_zones to get correct "W" labels
  res at tmXBMode = "Explicit"
  res at tmXBValues = ispan(-105,-95,1)
  res at tmXBLabels = (/"105W","","103W","","101W","","99W","","97W","","95W"/)

See the bottom panel of example #2 here:
http://www.ncl.ucar.edu/Applications/tickmarks.shtml#ex2

Note that the values input to tmXBValues need to be within the range of the
lon_zones coordinate variable values for the above to work. If I would have
done this:
res at tmXBValues = ispan(255,265,1)
the tickmarks would not have been shown.

Hope that helps. If you have further questions let ncl-talk know.
Adam

On Fri, Aug 31, 2018 at 5:22 PM Toni Klemm <toni-klemm at tamu.edu> wrote:

> Hi Adam,
>
> Thanks a lot for explaining that, it worked!
>
> Just one more thing. The spacing between numbers on the x axis is now so
> large that I only get a “100W” in the middle of my plot (which spans from
> 95 to 105 degrees West). Is there a way to adjust the spacing between
> numbers and tick marks to, say, 1 degree intervals? I know how to do it on
> the y axis (res at cnLevelSpacingF), but I don’t see how to change it to
> work for the x axis, too.
>
> Thank you again for your help!
>
> Toni
>
>
>
>
> *Toni Klemm, Ph.D.*Postdoctoral Research Associate
> Department of Ecosystem Science and Management
> College of Agriculture and Life Sciences
> Texas A&M University, College Station, TX
> Contributor to the Early Career Climate Forum <http://www.eccforum.org>
> www.toni-klemm.de | @toniklemm <http://twitter.com/toniklemm>
>
>
>
>
>
>
>
>
> On Aug 31, 2018, at 4:28 PM, Adam Phillips <asphilli at ucar.edu> wrote:
>
> Hi Toni,
> Thanks for sending a clean script and the data file as that made
> diagnosing the issue easier. When you call the gsn_csm_hov plotting
> function and pass in your data array (in your script named data_00), NCL
> will look at the coordinate variables attached to the 2 dimensions for
> information on how to display the data. If NCL does not find any coordinate
> variables, it will label the corresponding axis starting at 0. Looking at
> your data_00 array:
> Variable: data_00
> Type: float
> Total Size: 6800 bytes
>             1700 values
> Number of Dimensions: 2
> Dimensions and sizes: [year | 85] x [lon_zones | 20]
> Coordinates:
>             year: [2015..2099]
> Number Of Attributes: 3
>   units : %
>   long_name : Grassland percentage of total area in latitude zone 1
>   _FillValue : 9.96921e+36
>
> The 1st dimension is shown as have a coordinate variable (named year), but
> the 2nd dimension does not. (Note that the second dimension is named
> lon_zones though.) To solve the problem you need to attach the lon_zones
> array from the input .nc file as a coordinate variable to your data_00
> array:
> data_00&lon_zones = MC2_f->lon_zones
>
> If you have further questions let ncl-talk know.
> Adam
>
>
>
> On Fri, Aug 31, 2018 at 3:15 PM Toni Klemm <toni-klemm at tamu.edu> wrote:
>
>> Hello all,
>>
>> I'm trying to plot a time series of data in the form of a Hovmueller
>> plot. However, I have trouble adjusting the x axis such that it shows the
>> range of longitudes correctly. Instead of the longitude range, -105 to -95
>> degrees East in 0.5 degrees increments, it shows a range from 0 to 18 on
>> the x axis of the plot. Longitudes are included in the netCDF file as
>> variable “lon_zones”. I tried to adjust the x axis range manually using
>> res at trXMinF and res at trXMaxF, but I got this error message:
>>
>> warning:ContourPlotSetValues: X coordinates out of data range: defaulting
>>
>> I used example 5 here (
>> https://www.ncl.ucar.edu/Applications/time_lon.shtml
>> <https://urldefense.proofpoint.com/v2/url?u=https-3A__www.ncl.ucar.edu_Applications_time-5Flon.shtml&d=DwMFaQ&c=ODFT-G5SujMiGrKuoJJjVg&r=WsLJ5ywbW3XnTzqo_ETV62H6s1a5bcGgnrpl7xPRfic&m=VgThLzVijhWf-FblNez_y0LmBqtY9dHaMbJ3o1gCOkU&s=zJwsSMX3x66lHFdgGOdI10naJX7N1ScPJ0Shentz8p0&e=>)
>> as a template, but I didn’t find an explanation for how the x axis shows
>> longitudes there.
>>
>> Any help would be much appreciated!
>>
>> I attached the netCDF file, the plot, and my script.
>>
>> Thank you,
>> Toni
>>
>>
>>
>>
>> *Toni Klemm, Ph.D.*Postdoctoral Research Associate
>> Department of Ecosystem Science and Management
>> College of Agriculture and Life Sciences
>> Texas A&M University, College Station, TX
>> Contributor to the Early Career Climate Forum
>> <https://urldefense.proofpoint.com/v2/url?u=http-3A__www.eccforum.org&d=DwMFaQ&c=ODFT-G5SujMiGrKuoJJjVg&r=WsLJ5ywbW3XnTzqo_ETV62H6s1a5bcGgnrpl7xPRfic&m=VgThLzVijhWf-FblNez_y0LmBqtY9dHaMbJ3o1gCOkU&s=gppt_EbRFvdSA4qLiIQEHsei5NxmDtIsC71YGUDfO1k&e=>
>> www.toni-klemm.de
>> <https://urldefense.proofpoint.com/v2/url?u=http-3A__www.toni-2Dklemm.de&d=DwMFaQ&c=ODFT-G5SujMiGrKuoJJjVg&r=WsLJ5ywbW3XnTzqo_ETV62H6s1a5bcGgnrpl7xPRfic&m=VgThLzVijhWf-FblNez_y0LmBqtY9dHaMbJ3o1gCOkU&s=ESCx1g0uuNZA7maAaz9rjOLwzbRGQ7etUXx2FgDocPo&e=>
>>  | @toniklemm
>> <https://urldefense.proofpoint.com/v2/url?u=http-3A__twitter.com_toniklemm&d=DwMFaQ&c=ODFT-G5SujMiGrKuoJJjVg&r=WsLJ5ywbW3XnTzqo_ETV62H6s1a5bcGgnrpl7xPRfic&m=VgThLzVijhWf-FblNez_y0LmBqtY9dHaMbJ3o1gCOkU&s=gxXGitckavGUpEA7f8H7ItGPzw5DsZ9CXLsdCWoa7cY&e=>
>>
>>
>>
>>
>>
>>
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>
> --
> Adam Phillips
> Associate Scientist,  Climate and Global Dynamics Laboratory, NCAR
> www.cgd.ucar.edu/staff/asphilli/
> <https://urldefense.proofpoint.com/v2/url?u=http-3A__www.cgd.ucar.edu_staff_asphilli_&d=DwMFaQ&c=ODFT-G5SujMiGrKuoJJjVg&r=WsLJ5ywbW3XnTzqo_ETV62H6s1a5bcGgnrpl7xPRfic&m=VgThLzVijhWf-FblNez_y0LmBqtY9dHaMbJ3o1gCOkU&s=DmU_yPWQcHL_D5CCJScnx6lbFU3MBkxpBJfU-MtXVk4&e=>
>    303-497-1726
>
>
>

-- 
Adam Phillips
Associate Scientist,  Climate and Global Dynamics Laboratory, NCAR
www.cgd.ucar.edu/staff/asphilli/   303-497-1726

<http://www.cgd.ucar.edu/staff/asphilli>
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