[ncl-talk] Creating heatmap (Month/day vs. Year) in NCL

[Lyndon Mark Olaguera]

Dear Sir Dennis,

Thank you for the help. I got it clearly.


Sincerely,

Lyndz


On Thu, Aug 10, 2017 at 7:16 AM, Dennis Shea <shea at ucar.edu> wrote:

> re:
> "Has anyone tried to plot a heatmap using NCL or is this possible to do in
> NCL?"
>
> Your use if the term 'heatmap' is misleading. Anomalies (W/m2) are being
> plotted. However, the values could be anything .. not necessarily 'heat'.
>
> Given that the y-axis is 'YEAR' and the x-axis is 'day', a more
> appropriate classification would be a 'time-time' (year-day) plot.
>
> ---
> re: "Is this possible to do in NCL?"
>
> Yes, of course NCL can do it. Likely any tool could be used.
> Actually, the plot looks like an NCAR Graphics plot.
> ---
> re: "the sample data"
>
> The sample data file contains *monthly* precipitation. This* can not *be
> used to create the *daily* plot you attached. You *must *use daily data.
> ---
> re: attached plot
>
> This looks like colored anomalies were plotted and, the then another
> variable was overlaid.
>
> [1] read daily data
> [2] create daily climatology
> [3] calculate daily anomalies
> [4] for each year; extract the days spanning 15 May through 15 July
> [5] populate the array with the values for [4]
> [6] add appropriate meat data
> [7] plot a contour map; no overlays were performed.
>
> NCL has the climatology functions and date functions necessary to create a
> 'time-time plot. However, most of the work is book-keeping.
>
> ===
> The area you are using is so 'small' that simple averaging is adequate.
>
> ===
> I had an existing code that uses daily OLR values to compute daily
> climatologies and anomalies.  I added many comments and print statement.
> Please look carefully.
>
> Many comments point to the documentation for the functions being used.
> Again, please read.
>
> The figures show how to change the x-axis (day/month-day) labels
>
> Good luck
>
>
>
>
> On Tue, Aug 8, 2017 at 10:37 PM, Lyndon Mark Olaguera <
> olagueralyndonmark429 at gmail.com> wrote:
>
>> Dear NCL experts,
>>
>> Has anyone tried to plot a heatmap using NCL or is this possible to do in
>> NCL?
>>
>> I am trying to plot month-day versus year plot similar to the attached
>> figure.
>>
>> I want to apply this on an area averaged time series (here's the link to
>> the sample data)
>> https://www.dropbox.com/s/0jax40zbr231sdu/cmap.nc?dl=0
>>
>>
>> I'll appreciate if anyone can point me in the right functions to create
>> this.
>>
>> Thank you in advance.
>>
>> Sincerely,
>>
>> Lyndz
>>
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