rsMove (version 0.2.8)

hotMove: hotMove

Description

Detection of geographic regions of samples using a pixel based approach.

Usage

hotMove(x, y, return.shp = FALSE)

Arguments

x

Object of class SpatialPoints of SpatialPointsDataFrame.

y

Grid resolution. Unit depends on x projection.

return.shp

Logical. Should the function return polygons of the regions? Default is FALSE.

Value

A List containing a vector of region ID's per data point ($indices) and region polygons ($polygons).

Details

First, the function builds a raster with a resolution equal to y and the spatial extent of x. Then, each point in x is converted into pixel coordinates. Based on the unique pixel coordinates, the function then evaluates the spatial connectivity of these pixels using a 8-neighbor connected component labeling algorithm to detect regions. Finally, the ID's are related back to each individual data point in x based on their pixel coordinates and - if return.shp is TRUE - a polygon is derived from the convex hull of the points within each region. The output of the function consists of:

• region.id - Vector reporting on the region each element in x belongs to.

• polygons - Polygons for each unique region in region.id specified by the data column region.

• plot - A plot with the output of polygons accessible if return.shp is TRUE.

See Also

sampleMove hotMoveStats

Examples

# NOT RUN {
{

require(raster)

# reference data
data(longMove)

# extract regions
hm <- hotMove(longMove, 0.1)

}
# }