plotKML (version 0.5-4)

plotKML.GDALobj: Write tiled objects to KML

Description

Write tiled objects to KML. Suitable for plotting large rasters i.e. large spatial data sets.

Usage

plotKML.GDALobj(obj, file.name, block.x, tiles=NULL, 
   tiles.sel=NULL, altitude=0, altitudeMode="relativeToGround", colour_scale, 
   z.lim=NULL, breaks.lst=NULL, kml.logo, overwrite=TRUE, cpus, 
   home.url=".", desc=NULL, open.kml=TRUE)

Arguments

obj

"GDALobj" object i.e. a pointer to a spatial layer

file.name

character; output KML file name

block.x

numeric; size of block in meters or corresponding mapping units

tiles

data.frame; tiling definition generated using GSIF::tile

tiles.sel

integer; selection of tiles to be plotted

altitude

numeric; altitude of the ground overlay

altitudeMode

character; either "absolute", "relativeToGround" or "clampToGround"

colour_scale

character; color palette

z.lim

numeric; upper lower boundaries

breaks.lst

numeric; optional break lines (must be of size length(colour_scale)+1)

kml.logo

character; optional project logo file (PNG)

overwrite

logical; specifies whether to overwrite PNGs if available

cpus

integer; specifies number of CPUs to be used by the snowfall package to speed things up

home.url

character; optional web-directory where the PNGs will be stored

desc

character; optional layer description

open.kml

logical; specifies whether to open the KML file after writing

Value

• Returns a list of KML files.

See Also

plotKML, kml.tiles

Examples

library(sp)
library(snowfall)
library(GSIF)
library(rgdal)
fn = system.file("pictures/SP27GTIF.TIF", 
 package = "rgdal")
obj <- GDALinfo(fn)
tiles <- getSpatialTiles(obj, block.x=5000, 
  return.SpatialPolygons = FALSE)
## plot using tiles:
plotKML.GDALobj(obj, tiles=tiles, z.lim=c(0,185))
## Even better ideas is to first reproject 
## the large grid using 'gdalUtils::gdalwarp', then tile...