R: Convert points to SpatialPolygons*

coords2Polygons {mapview}

R Documentation

Convert points to SpatialPolygons*

Description

Create a SpatialPolygons* object from a Polygon object or set of point coordinates in one go, i.e. without being required to run through the single steps outlined in SpatialPolygons.

Usage

## S4 method for signature 'matrix'
coords2Polygons(coords, hole = NA, ID, data,
  match.ID = TRUE, ...)

## S4 method for signature 'Polygon'
coords2Polygons(coords, ID, data, match.ID = TRUE,
  ...)

Arguments

`coords`	`Polygon` object or 2-column `numeric` matrix with x and y coordinates.
`hole`	`logical`, see `Polygon`.
`ID`	`character`, see `Polygons`.
`data`	`data.frame` with data to add to the output `SpatialPolygons*` object (optional).
`match.ID`	`logical`, see `SpatialPolygonsDataFrame`.
`...`	Further arguments passed on to `SpatialPolygons` (i.e., `p0` and `proj4string`).

Value

If data is missing, a SpatialPolygons object; else a SpatialPolygonsDataFrame object.

Examples

library(sp)

coords1 <- cbind(c(2, 4, 4, 1, 2), c(2, 3, 5, 4, 2))
spy1 <- coords2Polygons(coords1, ID = "A")

coords2 <- cbind(c(5, 4, 2, 5), c(2, 3, 2, 2))
spy2 <- coords2Polygons(coords2, ID = "B")

plot(spy1, col = "grey75")
plot(spy2, col = "grey25", add = TRUE)