Readme file for datasets used to fit models (1-3) in "Neyens et al. 2019. Mapping species richness using opportunistic samples: 
a case study on ground-floor bryophyte species richness in the Belgian province of Limburg. Scientific Reports."

data_CSD.txt: citizen science data
data_RSD.txt: randomised survey data
Each line resembles 1 sampling event

Y: species richness measured during sampling event
V: relative coverage of valuable nature in the IFBL cell that was visited during the sampling event
F: relative forest coverage in the IFBL cell that was visited during the sampling event
t: year in which the sampling event took place
W: relative coverage by wet areas in the IFBL cell that was visited during the sampling event
C: the number of data collectors present at the sampling event
x: longitude of location of the sampling event (= center of IFBL cell with small amount of random jitter, needed to estimate the model)
y: latitude of location of the sampling event (= center of IFBL cell with small amount of random jitter, needed to estimate the model)
D: distance to the main collectors’ residential municipality in km.

Detailed information regarding variable definitions can be found in the main manuscript (Sections 2.1 and 2.2).