maptools (>= 0.8-5), testthat, XML, maps, rgdal
Roger Bivand [cre, aut],
Colin Rundel [aut],
Edzer Pebesma [ctb],
Karl Ove Hufthammer [ctb]

methods, sp (>= 1.1-0), utils, stats, graphics

c(
person("Roger", "Bivand", role = c("cre", "aut"), email = "Roger.Bivand@nhh.no"),
person("Colin", "Rundel", role = "aut"),
person("Edzer", "Pebesma", role = "ctb"),
person("Karl Ove", "Hufthammer", role = "ctb"),
person("Rainer", "Stuetz", role = "ctb"))
Roger Bivand [cre, aut],
Colin Rundel [aut],
Edzer Pebesma [ctb],
Karl Ove Hufthammer [ctb],
Rainer Stuetz [ctb]

c(
person("Roger", "Bivand", role = c("cre", "aut"), email = "Roger.Bivand@nhh.no"),
person("Colin", "Rundel", role = "aut"),
person("Edzer", "Pebesma", role = "ctb"),
person("Rainer", "Stuetz", role = "ctb"),
person("Karl Ove", "Hufthammer", role = "ctb"))
Roger Bivand [cre, aut],
Colin Rundel [aut],
Edzer Pebesma [ctb],
Rainer Stuetz [ctb],
Karl Ove Hufthammer [ctb]

Interface to Geometry Engine - Open Source ('GEOS')
Interface to Geometry Engine - Open Source ('GEOS') using the C 'API' for topology operations on geometries. The 'GEOS' library is external to the package, and, when installing the package from source, must be correctly installed first. Windows and Mac Intel OS X binaries are provided on 'CRAN'.

c(
person("Roger", "Bivand", role = c("cre", "aut"), email = "Roger.Bivand@nhh.no", comment=c(ORCID="0000-0003-2392-6140")),
person("Colin", "Rundel", role = "aut"),
person("Edzer", "Pebesma", role = "ctb"),
person("Rainer", "Stuetz", role = "ctb"),
person("Karl Ove", "Hufthammer", role = "ctb"),
person("Patrick", "Giraudoux", role = "ctb"),
person("Martin", "Davis", role = c("cph", "ctb")),
person("Sandro", "Santilli", role = c("cph", "ctb")))
Roger Bivand [cre, aut] (<https://orcid.org/0000-0003-2392-6140>),
Colin Rundel [aut],
Edzer Pebesma [ctb],
Rainer Stuetz [ctb],
Karl Ove Hufthammer [ctb],
Patrick Giraudoux [ctb],
Martin Davis [cph, ctb],
Sandro Santilli [cph, ctb]

Interface to Geometry Engine - Open Source ('GEOS') using the C 'API' for topology operations on geometries. The 'GEOS' library is external to the package, and, when installing the package from source, must be correctly installed first. Windows and Mac Intel OS X binaries are provided on 'CRAN'. ('rgeos' >= 0.5-1): Up to and including 'GEOS' 3.7.1, topological operations succeeded with some invalid geometries for which the same operations fail from and including 'GEOS' 3.7.2. The 'checkValidity=' argument defaults and structure have been changed, from default FALSE to integer default '0L' for 'GEOS' < 3.7.2 (no check), '1L' 'GEOS' >= 3.7.2 (check and warn). A value of '2L' is also provided that may be used, assigned globally using 'set_RGEOS_CheckValidity(2L)', or locally using the 'checkValidity=2L' argument, to attempt zero-width buffer repair if invalid geometries are found. The previous default (FALSE, now '0L') is fastest and used for 'GEOS' < 3.7.2, but will not warn users of possible problems before the failure of topological operations that previously succeeded.