gConvexHull

RGEOSConvexHull

Function produces the Convex Hull of the given geometry, the smallest convex polygon that contains all subgeometries

spatial

Interface to Geometry Engine - Open Source ('GEOS') using the C 'API' for topology operations on geometries. Please note that 'rgeos' will be retired during October 2023, plan transition to 'sf' or 'terra' functions using 'GEOS', or the 'geos' package, at your earliest convenience (see <https://r-spatial.org/r/2023/05/15/evolution4.html> and earlier blogs for guidance). 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. From 'GEOS' 3.8.0, repair of geometries may also be attempted using 'gMakeValid()', which may, however, return a collection of geometries of different types.

Roger Bivand

rgeos

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

Colin Rundel

Edzer Pebesma

Rainer Stuetz

Karl Ove Hufthammer

Patrick Giraudoux

Martin Davis

Sandro Santilli

gConvexHull function

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

Arguments

Author

Convex Hull of Geometry — gConvexHull

<dl>

 <dt>spgeom</dt>
<dd>sp object as defined in package sp</dd>

 <dt>byid</dt>
<dd>Logical determining if the function should be applied across subgeometries (TRUE) or the entire object (FALSE)</dd>

 <dt>id</dt>
<dd>Character vector defining id labels for the resulting geometries, if unspecified returned geometries will be labeled based on their parent geometries' labels.</dd>

</dl>

Convex Hull of Geometry

gConvexHull: Convex Hull of Geometry

Description

Usage

Arguments

Author

Details

See Also

Examples