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

[Christopher Gilroy]

Hey guys, I'm kinda getting there, but I've run into another problem, and I
have no idea at all what's causing this. But when I use 'd weasdsfc'
everything is colored. When I do (the "right" way to do 6-hr snow accum?):
'd sum(maskout(weasdsfc-weasdsfc(t-1),weasdsfc-weasdsfc(t-1)),t=2,t='%i%')'
I get the attached image output.

Any guesses? :-/

Note: This is a super-zoomed in area of Alaska, since I was debugging and
thinking maybe grads was hitting a memory limit or something, but it
happens regardless and I know it's related to that expression. :-/

http://i.imgur.com/CKAfnIy.png

On Fri, Sep 25, 2015 at 10:56 AM, Jennifer Adams <jma at cola.iges.org> wrote:

> Hi, Chris —
>
> Here’s how I think the numbers could be drawn in the sample from
> WeatherBell.
> 1. You have a particular grid point in mind, with a specific lat/lon
> 2. Set lat/lon to a range of values and draw the spatially varying graphic
> with shaded contours to set up the scaling.
> 3. Use ‘q w2xy’ to get the position of the lat/lon on the page, GrADS will
> return something like "X = 2.72222  Y = 5.58333”. Parse these with substr()
> to retain the x,y positions.
>
> 4. Fix lat/lon to the desired coordinates, display the variable, which
> should just print some text to the screen like “Result value = 0.33”
> 5. Parse that result to extract the value: val=subwrd(result,4)
> 6. use ‘draw string’ with the x,y positions and the data value to place
> the number on top of the shaded contours.
>
> If the numbers are based on station data, then it’s a different ball of
> wax.
> —Jennifer
>
>
>
>
>
> On 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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>>>
>>>
>>
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>
>
> --
> -Chris A. Gilroy
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>
> --
> Jennifer M. Adams
> Center for Ocean-Land-Atmosphere Studies (COLA)
> 111 Research Hall, Mail Stop 2B3
> George Mason University
> 4400 University Drive
> Fairfax, VA 22030
>
>
>
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-- 
-Chris A. Gilroy
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