The names, identities and characteristics described by the environmental metrics calculated for each plot. Each measurement of elevation is taken as the centre-point of one ‘cell’, and metrics are calculated only for those cells with eight neighbours (i.e. neglecting those at the plot edge). z, elevation; zi, elevation of cell i; nc, total number of cells; nn, number of neighbours of each cell (=8); zdiff, difference in elevation between two (neighbouring) cells; sfdiff, surface distance between two cells.