Hello all,
I am *very* new to R and am experimenting with the GRASS / R interface to look
at correlation of elevation and spectral values.
Reading through the literature and mailing list, I have imported my GRASS
rasters to R as a dataset looked at the summary statistics and then attempted
to run a correlation analysis using cor, along the lines of the example here:
map <- readRAST6(c("lageado_10k_fisher_K_15x15",
"lageado_10k_fisher_K_25x25"))
summary(map)
cor(as(map, "data.frame"))
and get the output:
coombe_rev_LRM intensity_coombe x y
coombe_rev_LRM 1 NA NA NA
intensity_coombe NA 1.00000000 -0.1525509 0.09057913
x NA -0.15255095 1.0000000 0.00000000
y NA 0.09057913 0.0000000 1.00000000
so the correlation is running on the x and y values of the rasters not the z?
How do I begin to assess correlation in the z value of two rasters?
Many thanks for reading, (and sorry if my question seems stupid or I have
missed something obvious)
Rebecca_______________________________________________
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