gnuplot: filling the whole space when plotting sampled data

Question

I have a problem with gnuplot. I've searched and I don't find the correct solution. I'm plotting some data arranged in three columns with the command splot, and the steps in x and y are different. The plot I get with:

set view map
splot 'data.dat'  using 1:2:3 with points palette

is:

and I would like the white space to be filled, making each tile size adapt, avoiding interpolation.

Some ideas are given here Reduce distance between points in splot. I've tryed http://gnuplot.sourceforge.net/demo/heatmaps.html too, but with image doesn't seem to work :(

I should avoid pointsize as my grid changes from time to time.

Answer 1

You can try

set pm3d map interpolate 1,1 corners2color c1
splot 'data.dat' using 1:($2-5e-5):3

This uses no interpolation, and the color of each polygon depends on the value of corner 'c1'. You may need to test if this is the correct one, or if you need 'c2', 'c3', or 'c4'.