Description Usage Arguments Details Value Author(s) References See Also Examples
The function driftmap()
creates two devices : a device with the map of coord
coordinates(sp.obj)
which permits to make selection of sites and a device divided into
2 rows and 2 columns which contains : (cell 1) the selected sites
divided into m rows and q columns (m and q are selected with the tk window),
(cell 2) a scatter plot with coordinates(sp.obj)[,2]
in x-axis and the mean and median of name.var
calculated for the m rows in y-axis,
(cell 3) a scatter plot with the mean and
median of name.var
calculated for the q columns in x-axis and coordinates(sp.obj)[,1]
in y-axis and (cell 4)
a legend indicating the direction of the North, the variable used, etc.
1 2 3 |
sp.obj |
object of class extending Spatial-class |
name.var |
a character; attribute name or column number in attribute table |
interpol |
if TRUE, the mean and median calculated are linearly interpoled |
nuage |
if TRUE, the values taken by var are also represented on right plot and on the left plot |
lty |
the line type for mean and median in the case of interpol=TRUE |
cex |
the amount by which plotting symbols on the cell 1 and in the case of nuage=TRUE cell 2 and cell 3 |
names.attr |
names to use in panel (if different from the names of variable used in sp.obj) |
carte |
matrix with 2 columns for drawing spatial polygonal contours : x and y coordinates of the vertices of the polygon |
identify |
if not FALSE, identify plotted objects (currently only working for points plots). Labels for identification are the row.names of the attribute table row.names(as.data.frame(sp.obj)). |
cex.lab |
character size of label |
pch |
c(16,16,16) by default, list of symbols for (1) the values of var on the left and on the right plot (2) the mean points, (3) the median points |
col |
c("lightblue3", "black", "red") by default, list of colors for (1) the values of var on the left and on the right plot (2) the mean points, (3) the median points |
xlab |
name of var printed with the legend plot |
axes |
a boolean with TRUE for drawing axes on the map |
Possibility to change the number of cells in the grid with the tk window, to interpolate the means and medians calculated (by default), to work on a rotated map. At the begining, all sites have been selected to the map : users have to deselect sites that they have choosen.
In the case where user click on save results
button,
a vector of integer is created as a global variable in last.select
object.
It corresponds to the number of spatial units selected just before leaving the Tk window.
Thomas-Agnan C., Aragon Y., Ruiz-Gazen A., Laurent T., Robidou L.
Thibault Laurent, Anne Ruiz-Gazen, Christine Thomas-Agnan (2012), GeoXp: An R Package for Exploratory Spatial Data Analysis. Journal of Statistical Software, 47(2), 1-23.
angleplotmap
,variocloudmap
,rotation
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 | ######
# data on price indices of real estate in France
data(immob)
row.names(immob)<-immob$Nom
# immob is a data.frame object. We have to create
# a Spatial object, by using first the longitude and latitude
# to create Spatial Points object ...
immob.sp = SpatialPoints(cbind(immob$longitude,immob$latitude))
# ... and then by integrating other variables to create SpatialPointsDataFrame
immob.spdf = SpatialPointsDataFrame(immob.sp, immob)
# For more details, see vignette('sp', package="sp")
# optional : we add some contours that don't correspond to the spatial unit
# but are nice for mapping
require("maptools")
midiP <- readShapePoly(system.file("shapes/region.shp", package="GeoXp")[1])
cont_midiP<-spdf2list(midiP[-c(22,23),])$poly
# a simple use of driftmap
driftmap(immob.spdf,"prix.vente", carte= cont_midiP)
# ... with options
driftmap(immob.spdf,"prix.vente", carte= cont_midiP,
interpol=FALSE, nuage=TRUE, lty=3:4,
identify=TRUE, cex.lab=0.3, xlab="Price of sell", axes=TRUE)
######
# data eire
eire <- readShapePoly(system.file("etc/shapes/eire.shp", package="spdep")[1],
ID="names", proj4string=CRS("+proj=utm +zone=30 +units=km"))
# a basic usage ...
driftmap(eire,"pale",identify=TRUE,nuage=TRUE)
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