rgeos: topo-unary-gCoverageUnion – R documentation

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topo-unary-gCoverageUnion

Coverage Union

Description

GEOSCoverageUnion is an optimized union algorithm for polygonal inputs that are correctly noded and do not overlap. It will not generate an error (return NULL) for inputs that do not satisfy this constraint.

Usage

gCoverageUnion(spgeom, byid=FALSE, id = NULL)

Arguments

`spgeom`	sp object as defined in package sp
`byid`	Logical determining if the function should be applied across subgeometries (TRUE) or the entire object (FALSE)
`id`	Character vector defining id labels for the resulting geometries, if unspecified returned geometries will be labeled based on their parent geometries' labels.

Author(s)

Roger Bivand

Examples

run <- FALSE
if (require(maptools)) run <- TRUE
if (run) {
    nc1 <- readShapePoly(system.file("shapes/sids.shp", package="maptools")[1],
        proj4string=CRS("+proj=longlat +datum=NAD27"))
}
if (run) {
    print(system.time(oU <- gUnionCascaded(nc1)))
    if (version_GEOS0() >= "3.8.0") {
        print(system.time(oCU <- gCoverageUnion(nc1)))
    }
}

rgeos

Interface to Geometry Engine - Open Source ('GEOS')

v0.5-5

GPL (>= 2)

Authors

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]

Initial release

2020-09-01