Scatterplot between two rasters in R?

Question

I am very new in programming and I want to ask how can I make a scatterplot of two rasters in R and also get their correlation?

I suspect you mean "coefficient of determination"?
– Spacedman
Oct 17, 2014 at 8:05 — Spacedman, Oct 17, 2014 at 8:05

Spacedman · Accepted Answer · 2014-10-17 06:50:44Z

9

If the rasters have the same basis (extent, resolution etc) then you just get the values and plot them. Something like:

 plot(values(r1), values(r2))

I'm not sure exactly what the "correlation of determination" is, but the simple "correlation" can be computed by:

 cor(values(r1), values(r2))

Note these are both dependent on the rasters having identical grid structures.

answered Oct 17, 2014 at 6:50

Spacedman

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You don't need to use values(). plot(r1, r2) will work.
– Oscar Perpiñán
Oct 17, 2014 at 8:28
1

I'm never sure when raw rasters work and when you need values() so I played it cautious without testing!
– Spacedman
Oct 17, 2014 at 8:51
1

Just for completeness. The coefficient of determination (R²) is the square of coefficient of correlation (r).
– Andre Silva
Feb 7, 2019 at 22:51

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