[gradsusr] tile and grfill

[Andrew Friedman]

Hi Jeff,

Here's an example of where I have the discrepancy.
I'm looking at a netcdf file with 2 variables, 'slope' and 'pval' (it's a
trend of rainfall). I'm trying to plot the slope using grfill, and to apply
the pattern in areas where 'pval' is above a certain value.

First, I define a tile as a new color:
'set tile 0 2 6 6 3 0'
'set rgb 41 tile 0'

Then, I shade the slope:
'set gxout shaded' * (or grfill)
'd slope'

Third, I apply the pattern fill to pval:
'set clevs 0.05'
'set ccols 41 -1'
'd pval'

When I use 'set gxout shaded', the pattern fills on top of the existing
shading, as in the GrADS website example. However, when I use 'set gxout
grfill', the initial fill disappears in areas without pattern fill. I've
attached images showing the differences.

Any ideas? I know it's not a major issue, but I often look at coarse
spatial resolution datasets, and I like the grfill setting to present where
the gridbox boundaries are exactly.

Thanks,
Andrew


On Tue, Jan 26, 2016 at 6:42 PM, Jeff Duda <jeffduda319 at gmail.com> wrote:

> Andrew,
> Can you clarify your question please? What exactly do you mean by "tiling"?
>
> The difference between grfill and shaded is that shaded color shades
> between (smoothed) contours drawn by the software, giving your fields a
> nicer smoother look, whereas grfill just uses color shades to fill by grid
> box only, with no contour lines drawn to serve as boundaries for color
> areas. For very high resolution grids, you won't really see much, if any,
> difference between a field displayed using grfill and that field displayed
> using shaded. It only really shows up for coarser grids.
>
> Jeff Duda
>
> On Tue, Jan 26, 2016 at 10:58 AM, Andrew Friedman <andfried at gmail.com>
> wrote:
>
>> Hi GrADS users,
>>
>> I am trying to tile areas of significance using grfill. However, I have
>> noticed that tiling seems to behave differently with gxout set to grfill v.
>> shaded. When gxout is set to grfill, all values that are not tiled are
>> return to the background. Does anyone know a work-around for this?
>>
>> Thanks, Andrew
>>
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>>
>>
>
>
> --
> Jeff Duda
> Graduate research assistant
> University of Oklahoma School of Meteorology
> Center for Analysis and Prediction of Storms
>
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>
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