Ignorance scores as a function of the number of observations per grid cell. The curves for the half-ignorance algorithm (red lines) are calculated for three values of O0.5 = 1, 5, and 10 (i.e. enough number of observations to reduce the ignorance score by half).

  Part of: Ruete A (2015) Displaying bias in sampling effort of data accessed from biodiversity databases using ignorance maps. Biodiversity Data Journal 3: e5361. https://doi.org/10.3897/BDJ.3.e5361