kmlLines

From maptools v0.9-9 by Roger Bivand

Create and write a KML file on the basis of a given Lines object

The function is used to create and write a KML file on the basis of a given Lines object (a list of Line objects) for the usage in Google Earth and Google Maps.

Keywords: spatial

Usage

kmlLines(obj=NULL, kmlfile=NULL, 
        name="R Lines", description="", col=NULL, visibility=1, lwd=1,
        kmlname="", kmldescription="")

Arguments

obj: a Lines or SpatialLinesDataFrame object
kmlfile: if not NULL the name as character string of the kml file to be written
name: the name of the KML line
description: the description of the KML line (HTML tags allowed)
col: the stroke color (see also Color Specification) of the KML line
visibility: if set to 1 or TRUE specifies that the KML line should be visible after loading
lwd: the stroke width for the KML line
kmlname: the name of the KML layer
kmldescription: the description of the KML layer (HTML tags allowed)

Details

The function is used to convert a given Lines object (a list of Line objects) or the first Lines object listed in a passed SpatialLinesDataFrame object into KML line(s). If kmlfile is not NULL the result will be written into that file. If kmlfile is NULL the generated KML lines will be returned (see also value). Function no longer uses append greatly improving performance on large objects or lists.

For a passed Lines object the function generates a <Style> tag whereby its id attribute is set to the passed object's ID.

Note that the geometries should be in geographical coordinates with datum WGS84.

The resulting KML line will be embedded in <Placemark><MultiGeometry><LineString>.

Value

x is a list with the elements style and content containing the generated lines of the KML file as character vectors if kmlfile is NULL.

y is a list with the elements header and footer representing the KML file header and footer if obj is NULL.

Color Specification

The following color specifications are allowed: 'red', 2, or as hex code '#RRGGBB' resp. '#RRGGBBAA' for passing the alpha value.

Examples

# NOT RUN {
# Maptools library required
library(maptools)
# load line object
rivers <- readShapeSpatial(system.file("shapes/fylk-val-ll.shp",
                           package="maptools")[1], proj4string=CRS("+proj=longlat +ellps=WGS84"))
# create kml file
td <- tempdir()
kmlfile <- paste(td, "rivers.kml", sep="/")
kmlLines(rivers, kmlfile = kmlfile, name = "R Lines", 
         description = "Hello!", col = "blue", visibility = 1, lwd = 1, 
         kmlname = "", kmldescription = "")
# }

Documentation reproduced from package maptools, version 0.9-9, License: GPL (>= 2)

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