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Publié par

profil-urra-2012

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English

Tutorial using the free software Performing a spatial Principal Component Analysis using the R software T. JOMBART November 2006 For any questions or comments, please send an email to: . Contents 1 Introduction 2 2 Building a connection network 4 3 Performing the analyses 5 3.1 Testing for the existence of spatial structures . . . . . . . . . . . . . 6 3.2 Identifying and displaying the spatial structures . . . . . . . . . . . 8 3.2.1 The Principal Component Analysis . . . . . . . . . . . . . . 8 3.2.2 The spatial Principal Component Analysis . . . . . . . . . . 10 1

cats

conversion functions

build connection

include spatial

spdep knn

function library

tutorial using

nb2neig

gabriel graph

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Publié par

profil-urra-2012

Langue

English

Library (computing) Gabriel graph

Data

library(spdep)

R is a statistical language which can be freely downloaded f //www.r-project.org/package). The spdepwritten by voted to the creation and to the manipulation of spatial You have to install it and to load it into your R session:

We illustrate the method using two data sets. The data consists in a zip archive containing two ArcView shapeﬁles (ESRI ﬁle format). Files are extracted and data are loaded into R with theread.shapefunction of themaptoolslibrary.

"spatialrlqdata.zip")

zip.file.extract("environment.dbf",

Introduction

Contents

February 10, 2006

Performing spatial-RLQ analysis with

Introduction

St´ephaneDray

Spatial-RLQ analysis

Data

rom internet (http: Roger Bivand is de-weighting matrices.

You need also theade4package (multivariate analyses) and themaptoolspack-age (if data are stored in the shapeﬁle format (ArcView GIS): library(ade4) library(maptools)

This document indicates how to perform spatial-RLQ analysis (Dray et al., 2002) in R. Commands are written in red and outputs are written in blue.

Lastly, download and source the ﬁlespatialrlq.Ravailable in the software section of my website. source("spatialrlq.R")

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