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Last data update: 2014.03.03

R: Exploratory point pattern analysis.

tspan

R Documentation

Exploratory point pattern analysis.

Description

This function is design to provide an exploratory point pattern analysis. Is base on spatstat package a to do a basic point pattern analysis of Homogeneous an Inhomogeneous Poisson.

Usage

tspan(geotweets,bw, cont, acontour)

Arguments

`geotweets`	Geotagged tweets as a SpatialPointsDataFrame or a SpatialPointsDataFrame.
`bw`	Bandwith for Kernel Smoothed Intensity. Note that if you are using directly geotweets comming from `tweet2r` and `t2SpatialPointDataFrame` units are degrees.
`cont`	FALSE by default, geotweets bounding box provide the countour. If TRUE a countour must be provaided
`acontour`	Optional. A Spatial object with a defined bbox.

Details

In order to do a wider point pattern analysis is better to use directly the spatstat package

Value

`tweetspphp`	Simpliest Object of class"ppp"representing a point pattern dataset in the two-dimensional plane with no marks, (`ppp`)
`hp`	Homogeneous Poisson fitted point process model to an observed point pattern (`ppm`).
`ihp`	Inhomogeneous Poisson fitted point process model to an observed point pattern (`ppm`).
`int`	Computed kernel smoothed intensity function from a point pattern. (`density.ppp`).

Author(s)

Pau Arag<c3><83><c2><b3>

References

Baddeley, Adrian, y Rolf Turner. <c3><82><c2><ab>Spatstat: An R Package for Analyzing Spatial Point Patterns<c3><82><c2><bb>. Journal of Statistical Software 12, n.<c3><82><c2><ba> 6 (2005). doi:10.18637/jss.v012.i06. http://www.jstatsoft.org/v12/i06/

Examples

library(sp)
library(spatstat)

#loada a SpatialPointsDataFrame
data("meuse.grid_ll")


# run function without contour
tspan(meuse.grid_ll,bw=0.0005)

#providing a contour as SpatialPointDataFrame
data("meuse.area")

#build the acontour layer 
cont<-SpatialPoints(meuse.area, proj4string = CRS("+init=epsg:28992"))
#transform to meuse.grid_ll reference system
cont<-spTransform(cont, CRS("+init=epsg:4326"))

# run function with contour
tspan(meuse.grid_ll,bw=0.0005, cont = TRUE, acontour=cont)
{
  }