You are here:
Biodiversity and WorldMap
UPPER ROW: 
Equalinterval score scale
(see histogram of score frequencies against colour scale)
this gives the same range of score values to each colour
class, but because the scores from some measures are inherantly highly
skewed towards low values for widespread species, the maps may be predominantly
dark blue and uninformative

LOWER ROW: 
Equalfrequency score scale
(see histogram)
this gives the same number of grid cells to each colour
class, which with the same scores has the effect of distinguishing subtle
differences in scores among areas

difference
sum for all spp in cell of (Cc)

inverse
sum for all spp in cell of (1/c)

inverse square
sum for all spp in cell of (1/c^{2})

inverse minimum
sum for all spp in cell of (1/c_{min})

where c is the number of cells occupied by
a species, and C is the total number of cells
