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From: sfeam <sfeam@users.sourceforge.net>
Newsgroups: comp.graphics.apps.gnuplot
Subject: Re: splot with dgrid3d / pm3d?
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Date: Sat, 09 Feb 2013 20:28:10 -0800
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neurino wrote:

> Dear gnuplotters,
> 
> i have 3D data, which look like this
> # x y z
> 1996-12 68 -0.09928498
> 1996-12 69 -0.1597349
> 1996-12 70 -0.009438827
> ...
> ...
> 1997-01 68 -0.09928498
> 1997-01 69 -0.1597349
> 1997-01 70 -0.009438827
> 
> and so on, 192 data (x) blocks, each of 141 values (y).

I may not understand the question.
It looks from the *.jpg you point to that you aren't really
trying for a 3D plot, but a 2D heatmap.  Is that correct?
If so then neither pm3d nor isosamples are needed.

Try  
    plot "data" using 2:1:3 with image

There are actually quite a few ways to create a heatmap.
You might have a look at the demos here

    http://gnuplot.sourceforge.net/demo_cvs/heatmaps.html

As to smoothing and highlighting, I'd have to know a lot
more about the data structure and what you are looking
for.  Maybe a Fourier transform + high frequency filter?
Or just output the heatmap as a PNG image and read it into
an image processing tool like Photoshop or GIMP.


	Ethan

> 
> The following plot
> http://img39.imageshack.us/img39/8113/cthanzonalfull.jpg
> 
> has been created with (relevant commands):
> 
> set pm3d map
> set isosample 1200
> set xdata time
> set timefmt "%Y-%m-%d"
> splot f1 u 1:2:3 notitle
> 
> However, i'd like to smooth them and highlight patterns.
> I am having difficult times with set dgrid3d, because if i set
> 
> set dgrid3d 40,40,16
> 
> i get this result
> http://img16.imageshack.us/img16/1641/testiiq.jpg
> 
> So, from the demos i don't get how the non-gridded data should be
> preprocessed, having set dgrid3d instead of pm3d, given that the nice
> demos are achieved with splot 1:2:3 too.
> 
> Thanks for the help.