gnuplot-info

[Gnuplot-info] 2-D Intensity Plots of Titan

[Jeff S. <js...@my...>]

I am trying to map the surface of Saturn's largest moon, Titan for a NASA summer research project.  As a rough draft, I would like to plot the temperature (colored red) at the longitude(x) and latitude(y) coordinates.  My data file is tab delimited in three columns (x,y,T).  I am also missing some x,y locations, which I would like to leave blank.

As a final report, I would like the data point to be able to take on different geometries (circle, hexagon, arbitrary shape, etc) and different sizes as well as be able to overlap with neighboring data points.  Finally, I would like to be able to plot this not on a rectangular cartesion coordinate system, but on a planetographic (global projection) coordinate system.

I've spent two days trying everything from gnuplot, matlab, matplotlib and others trying to do this, but to no avail.  Any suggestions would be very welcomed.

Re: [Gnuplot-info] 2-D Intensity Plots of Titan

[<br...@ph...>]

Jeff Sadino wrote:

> I am trying to map the surface of Saturn's largest moon, Titan for a
> NASA summer research project.  As a rough draft, I would like to plot
> the temperature (colored red) at the longitude(x) and latitude(y)
> coordinates.  My data file is tab delimited in three columns (x,y,T).
> I am also missing some x,y locations, which I would like to leave
> blank.

So you want big, false-coloured point symbols wherever you have data.
No interpolation in between, no smoothing, nothing.  In that case

	splot 'data' u 1:2:3 with points palette pointsize 10

or something like that, in any reasonably current gnuplot, should do it.

> points.  Finally, I would like to be able to plot this not on a
> rectangular cartesion coordinate system, but on a planetographic
> (global projection) coordinate system.

See 'world.dem' to learn about handling of spherical data.