| spottedWoodpecker {AHMbook} | R Documentation |
Data for observations of Middle Spotted Woodpecker in Switzerland
Description
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.
Usage
data("spottedWoodpecker")Format
spottedWoodpecker is a data frame with 116,204 rows and 7 columns:
- site
quadrat identifier.
- coordx, coordy
the x and y coordinates of the center of the quadrat; the coordinate reference system intentionally not specified.
- year, jdate
the year and Julian date of the observations.
- y
the number of surveys during which the species was detected.
- nsurveys
the number of recorded surveys in the quadrat on that day.
Source
Database of Swiss Ornithological Institute (courtesy of Nicolas Strebel).
References
Kéry, M. & Royle, J.A. (2021) Applied Hierarchical Modeling in Ecology AHM2 - 4.11.2.
Examples
data(spottedWoodpecker)
str(spottedWoodpecker)