Fig. 6
From: Assessing citizen science data quality for bird monitoring in the Iberian Peninsula
10 × 10 km cell completeness along three environmental variables for the bird species’ citizen science dataset in the Iberian Peninsula. Frequency distribution of total (black bars) and well-sampled cells, considering strict (N ≥ 1000 and C ≥ 0.9) (brown bars) and lax (N ≥ 200 and C ≥ 0.8) (yellow bars) criteria by (a) annual mean temperature, (b) annual rainfall and (c) altitude (ordinates in log-scale). Frequency distribution of cell completeness along the same environmental variables: (d) temperature, (e) rainfall, (f) altitude. In (d–f) brown and yellow bars are well sampled cells according to strict and lax criteria, respectively. Green bars are cells not well-sampled and the red ones, cells with no data.
