btb (version 0.1.14)

smoothingToGrid: Building of a basemap from smoothed data

(Fonction de transformation d'un lissage en un fond de carte carroye)

Description

Transforms smoothed data into grid data for export as cartographical data.

(Transforme un lissage en un carroyage pour export cartographique.)

Usage

smoothingToGrid(grid, epsg, fUpdateProgress = NULL)

Arguments

grid

the grid obtained from the smoothing

(le grid obtenu lors du lissage)

epsg

EPSG code

(code EPSG de projection)

fUpdateProgress

leave empty for the speedest mode; or give a fct to see the compute progress (slower)

(ne pas remplir pour utiliser la fonction dans son mode le plus rapide; ou fournir une fonction pour suivre la progresion du traitement (plus lent))

Details

Returns a spatialPolygonsdataframe.

(Retourne un spatialPolygonsdataframe.)

Examples

# NOT RUN {
data(reunion)
# Smoothing all variables for Reunion (Lissage de toutes les variables pour la Reunion)

# Call mode 1: classic smoothing - automatic grid
reunionSmooth <- kernelSmoothing(dfObservations = reunion, cellSize = 200
                                , bandwidth = 400)

# Call mode 2: median smoothing - automatic grid
reunionSmooth <- kernelSmoothing(dfObservations = reunion, cellSize = 200
                                , bandwidth = 400, vQuantiles = c(0.1, 0.5, 0.9))

# Call mode 3: classic smoothing - user grid
dfCentroidsUser <- merge( x = seq(from =  314400, to = 378800,  by = 200)
                        , y = seq(from = 7634000, to = 7691200, by = 200))
reunionSmooth <- kernelSmoothing(dfObservations = reunion, cellSize = 200
                                , bandwidth = 400, dfCentroids = dfCentroidsUser)

# Call mode 4: median smoothing - user grid
reunionSmooth <- kernelSmoothing(dfObservations = reunion, cellSize = 200
                                , bandwidth = 400, vQuantiles = c(0.1, 0.5, 0.9)
                                , dfCentroids = dfCentroidsUser)

# Building of the associated basemap (Creation du fond de carte associe)
grid <- smoothingToGrid(reunionSmooth, "32740")

# preview (Apercu)
library(sp)
library(cartography)
cartography::choroLayer(grid, var = "houhold", nclass = 5
                      , method = "fisher-jenks", border = NA)

# Export of the basemap in shapefile format (Export du fond de carte au format shapefile)
library(rgdal)
rgdal::writeOGR(grid, "reunion.shp", "reunion", driver = "ESRI Shapefile")
# }