geo (version 1.4-3)

geopoints: Adds points on plots initialized by geoplot.

Description

Plot points on a graph initialized by geoplot. Data is stored as lat, lon or x,y depending on the projection. The program plots the transformation of the data. Parameters for the projection are stored in the list geopar. Similar to the Splus function points.

Usage

geopoints(lat, lon = 0, pch = "*", cex = 0.7, col = 1, lwd = 0, outside = FALSE, jitter = NULL, mkh = NULL, csi = NULL)

Arguments

lat,lon

Plot points on a graph initialized by geoplot. Data is stored as lat, lon or x,y depending on the projection. The program plots the transformation of the data. Parameters for the projection are stored in the list geopar. Similar to the Splus function points.

pch

Type of symbol used options are for example. " ","*","+","." or anything else, letter, digit, or symbol. Default is "*"

cex

Relative size of character and symbols (see the help on the parameter cex). The size of plotted characeters is cex time the parameter csi that can be seen by par("csi"). In earlier versions of geoplot the parameter csi was set but csi is a parameter that can not be set in R. The parameter mkh should probably be used for symbols instead of cex, see help on graphical parameters.

col

Colour number used. Default value is one.

lwd

Linewidth used. Default is the value set when the program was called.

outside

If TRUE geopoints will plot points outside the specified limits set by geoplot(). If FALSE, which is default, outside points will be skipped.

jitter

useful if many datapoints have the same coordinates, points are jittered randomly to make common values look bigger.jitter=0.016 is often about right but you may want to have jitter smaller or bigger varying on plot.

mkh

Size of symbol in inches. If not given cex is used instead.

csi

Size of character. This parameter can not be set in R but for compatibility with old Splus scripts the parameter cex is readjusted by cex = cex*csi/0.12. Use of this parameter is not recommended. Default value is NULL i.e not used.

See Also

geoplot, geopolygon, geolines, points, geotext, geosymbols, geocontour.fill, geogrid, geocontour.

Examples

## Not run:        geopoints(deg)                  # Plots * in the points
#                                                 # defined by deg$lat,deg$lon.
# 
#        geopoints(deg$lat,deg$lon,pch="*",col=5) # Same but uses color 5.
# 
#        geopoints(fd$x,fd$y)                     # Points in x,y when
#                                                 # projection in geoplot
#                                                 # was "none".
# ## End(Not run)