The data set is based on checklists which volunteers submit from their bird-watching trips and which were then summarized by day and site (1 km2 quadrat) such that we have the number of surveys (= checklists) per quadrat and day, and the number among these on which a Middle-Spotted Woodpecker was recorded, during 162 days (Julian days 51–212, corresponding to 20 February–31 July). There are data from a total of 144,517 recorded surveys on 116,204 day/quadrat combinations during 26 years from 1545 1 km2 quadrats in which the species was ever recorded in Switzerland since 1985.
data("spottedWoodpecker")spottedWoodpecker is a data frame with 116,204 rows and 7 columns:
quadrat identifier.
the x and y coordinates of the center of the quadrat; the coordinate reference system intentionally not specified.
the year and Julian date of the observations.
the number of surveys during which the species was detected.
the number of recorded surveys in the quadrat on that day.
Kéry, M. & Royle, J.A. (2021) Applied Hierarchical Modeling in Ecology AHM2 - 4.11.2.
data(spottedWoodpecker)
str(spottedWoodpecker)
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