spatial: Spatial Methods for 'Vegsoup*' Objects

In vegsoup: Classes and Methods for Phytosociology

Description

Spatial methods as defined in package sp.

Usage

## S4 method for signature 'Vegsoup'
coordinates(obj)

## S4 method for signature 'Sites'
coordinates(obj)

## S4 replacement method for signature 'Vegsoup'
coordinates(obj) <- value

## S4 method for signature 'Vegsoup'
bbox(obj)

## S4 method for signature 'Vegsoup'
bbox(x)

## S4 method for signature 'Vegsoup'
proj4string(obj)

## S4 replacement method for signature 'Vegsoup'
proj4string(obj) <- value

## S4 method for signature 'Vegsoup'
spTransform(obj, CRS)

## S4 method for signature 'Vegsoup'
SpatialPointsVegsoup(obj)

## S4 method for signature 'Vegsoup'
SpatialPolygonsVegsoup(obj)

## S4 method for signature 'Vegsoup'
over(x, y, returnList = FALSE, fn = NULL, ...)

Arguments

x, obj	Vegsoup object.
y	SpatialPolygonsDataFrame object.
value	For coordinates spatial coordinates; either a "matrix", "list", or "data.frame" with numeric data. See coordinates. For proj4string a CRS object, containing a valid Proj.4 string.
CRS	An object of class "CRS". See CRS.
...	Additional arguments, not used.
returnList, fn	See over in sp.

Details

All methods operate on the spatial slots of an object: SpatialPointsVegsoup and SpatialPolygonsVegsoup.

• coordinates retrieves or sets the spatial coordinates. Note, in contrast to the generic method defined in package sp it is possible to set coordinates, where they have already been set (accounts for class Vegsoup only)! The coordinates method for class Sites tries to get coordinates from named variables longitude and latitude, otherwise simulated coordinates in the unit square (runif(length(unique(obj$plot)), min = 0, max = 1)) are returned.

• bbox retrieves the spatial extent (extremes) from coordinates(obj).

• extent returns the same but as class Extent.

• proj4string retrieves or sets the projection attributes (coordinate reference system). See proj4string and CRS for details.

• spTransform provides transformation between datum(s) and conversion between projections (also known as projection and/or re-projection). Note, load package rgdal for spTransform method to work.

• over provides an overlay method for spatial polygons.

Value

An object depending on the input class.

Author(s)

Roland Kaiser

See Also

Spatial,extract

Examples

require(vegsoup)

data(barmstein)
x <- barmstein

# coordinate reference system of data set is WGS 84
proj4string(x)

# transform to WGS 84 / Pseudo Mercator
require(rgdal)
xt <- spTransform(x, CRS("+init=epsg:3857"))

# plain matrix of coordiantes
coordinates(x)

# bounding box, as defined in package 'sp'
bbox(x)

# extent, the same as above but returned as class 'Extent'
# as defined in package 'raster'
extent(x)

# assign new coordinates
# first create the data as columns
x$X <- rnorm(nrow(x))
x$Y <- rnorm(nrow(x))
sites(x)

# use the formula interface
coordinates(x) <- ~X+Y
coordinates(x)

# get slot 'sp.points' as sp class
class(SpatialPointsVegsoup(x))

# get slot 'sp.polygons' as sp class
class(SpatialPolygonsVegsoup(x))

vegsoup documentation built on Feb. 24, 2021, 3 a.m.