gm: Defoliated by gypsy moth each in northeast US 1975-2002.
In epimdr: Functions and Data for "Epidemics: Models and Data in R"

Description Usage Format Source

A dataset containing the fraction of forest defoliated by the gypsy moth in 20km x 20km pixels across northeast US in each year between 1975 and 2002.

gm

A data frame with 1086 rows and 30 variables:

UTMX: UTM x-coordinates
UTMY: UTM y-coordinates
d1975: Defolitation in 1975
d1976: Defolitation in 1976
d1977: Defolitation in 1977
d1978: Defolitation in 1978
d1979: Defolitation in 1979
d1980: Defolitation in 1980
d1981: Defolitation in 1981
d1982: Defolitation in 1982
d1983: Defolitation in 1983
d1984: Defolitation in 1984
d1985: Defolitation in 1985
d1986: Defolitation in 1986
d1987: Defolitation in 1987
d1988: Defolitation in 1988
d1989: Defolitation in 1989
d1990: Defolitation in 1990
d1991: Defolitation in 1991
d1992: Defolitation in 1992
d1993: Defolitation in 1993
d1994: Defolitation in 1994
d1995: Defolitation in 1995
d1996: Defolitation in 1996
d1997: Defolitation in 1997
d1998: Defolitation in 1998
d1999: Defolitation in 1999
d2000: Defolitation in 2000
d2001: Defolitation in 2001
d2002: Defolitation in 2002

Bjornstad, O. N., Robinet, C., & Liebhold, A. M. (2010). Geographic variation in North American gypsy moth cycles: subharmonics, generalist predators, and spatial coupling. Ecology, 91(1), 106-118. doi.org/10.1890/08-1246.1.

epimdr documentation built on March 26, 2020, 7:41 p.m.