[gradsusr] Trying to plot values (grid? ascii?) of weasdsfc onto map.

Christopher Gilroy chris.gilroy at gmail.com
Fri Sep 25 10:24:13 EDT 2015


I hear you, I've done that too. Can you take a peak at either of the images
I linked to? With your knowledge of grads, would you say they are plotting
those snowfall numbers using gxout grid? It just seems so different than
what a gridded plot does, even with skipping.

On Fri, Sep 25, 2015 at 10:21 AM, Stephen McMillan <
smcmillan at planalytics.com> wrote:

> Yes, Chris, what you said makes sense.  If all you want to do is thin out
> the number displays from a grid, then use "skip" (and maskout too if you
> want to not plot the values over some area such as over water).  For
> example:
>
> 'd skip(maskout(t2m,landsfc-0.5),2)'
>
> displays every other grid value in both x- and y-direction over land areas
> only, where "t2m" was my temperature variable.
>
> Stephen
>
> On Fri, Sep 25, 2015 at 9:59 AM, Christopher Gilroy <
> chris.gilroy at gmail.com> wrote:
>
>> I do want it to draw snowfall amounts, but like in the two images, not
>> "griddy". If you look at,
>> http://blog.chron.com/weather/wp-content/blogs.dir/2579/files/2014/01/gfs_6hr_snow_acc_se_19.png
>> that doesn't appear to be drawing those numbers based on a grid at all.
>> They are all scattered about on the map with no real "grid" structure to
>> them. The only way I know how to "control" the frequency (perhaps
>> "stepping" might be a better word?) of the drawing of values would really
>> be to maskout coupled with re-gridding so it doesn't put a number on every
>> possible area that weasdsfc has a value for is. If that makes sense?
>>
>> On Fri, Sep 25, 2015 at 9:53 AM, Stephen McMillan <
>> smcmillan at planalytics.com> wrote:
>>
>>> Hello Chris,
>>>
>>> If you don't want to display all the grid values, then you can use 'draw
>>> string...' using the coordinates of whatever stations or locations you want
>>> displayed on top of the shaded contours.  See
>>> http://www.iges.org/grads/gadoc/gradcomddrawstring.html
>>>
>>> Stephen McMillan
>>>
>>> On Fri, Sep 25, 2015 at 8:55 AM, Christopher Gilroy <
>>> chris.gilroy at gmail.com> wrote:
>>>
>>>> I'm trying to plot something like this:
>>>> http://i60.tinypic.com/2v9voe0.jpg (WXBell has the same basic setup,
>>>> http://blog.chron.com/weather/wp-content/blogs.dir/2579/files/2014/01/gfs_6hr_snow_acc_se_19.png)
>>>> with the inch's plotting on-top of the shaded area but the only way I know
>>>> how to display "values" like that is with gxout grid, which then makes the
>>>> numbers plot in grids (obviously) and unless I'm missing something with
>>>> options I don't see a way to make it output as "loose" as theirs are,
>>>> instead of literally in a "grid" (square box) format.
>>>>
>>>> I'm currently simply doing:
>>>>
>>>> 'set gxout grid'
>>>> 'set gridln off'
>>>> 'set dignum 1'
>>>> 'set digsiz 0.05'
>>>> 'd re(maskout(weasdsfc, weasdsfc-3), 0.25)'
>>>>
>>>> Which, you can image it will output tons of numbers all over, making it
>>>> completely illegible. Any clue on how to do something like the above two
>>>> images?
>>>>
>>>> --
>>>> -Chris A. Gilroy
>>>>
>>>> _______________________________________________
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>>>> gradsusr at gradsusr.org
>>>> http://gradsusr.org/mailman/listinfo/gradsusr
>>>>
>>>>
>>>
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>>>
>>
>>
>> --
>> -Chris A. Gilroy
>>
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>>
>
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>


-- 
-Chris A. Gilroy
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