| kml_layer.SpatialPixels {plotKML} | R Documentation |
Writes sp classes "SpatialGrid" or "SpatialPixels" to PNG images and makes a KML document (ground overlays). Target attributes can be specified using aesthetics arguments (e.g. "colour").
kml_layer.SpatialPixels(obj, subfolder.name = paste(class(obj)), raster_name,
plot.legend = TRUE, metadata = NULL,
png.width = gridparameters(obj)[1,"cells.dim"],
png.height = gridparameters(obj)[2,"cells.dim"],
min.png.width = 800, TimeSpan.begin, TimeSpan.end,
layer.name, png.type, ...)
obj |
object of class |
subfolder.name |
character; optional subfolder name |
plot.legend |
logical; specify whether a map legend should be generated automatically |
metadata |
(optional) specify the metadata object |
raster_name |
(optional) specify the output file name (PNG) |
png.width |
(optional) width of the PNG file |
png.height |
(optional) height of the PNG file |
min.png.width |
(optional) minimum width of the PNG file |
TimeSpan.begin |
object of class |
TimeSpan.end |
object of class |
layer.name |
character; optional layer name |
png.type |
character; PNG type |
... |
additional |
Google Earth does not properly handle a 24-bit PNG file which has a single transparent color (read more at Google Earth Help). To force transparency, plotKML will try to set it using the -matte -transparent "\#FFFFFF" option in the ImageMagick convert program (ImageMagick needs to be installed separately and located using plotKML.env()). The PNG export uses the 'cairographics', which will never use a palette and normally creates a larger 32-bit ARGB file, but then always allows transparancy. On some Unix run machines the png.type argument has to be set manually to avoid producing empty PNGs.
Tomislav Hengl, Pierre Roudier and Dylan Beaudette
kml-methods, kml_open, kml_layer.Raster, plotKML-method
data(eberg_grid)
library(sp)
library(rgdal)
library(raster)
coordinates(eberg_grid) <- ~x+y
gridded(eberg_grid) <- TRUE
proj4string(eberg_grid) <- CRS("+init=epsg:31467")
data(SAGA_pal)
## Not run: ## KML plot with a single raster:
kml(eberg_grid, colour_scale = SAGA_pal[[1]], colour = TWISRT6)
## make a larger image:
kml(eberg_grid, colour_scale = SAGA_pal[[1]], colour = TWISRT6,
png.width = 600, png.height = 600)
## End(Not run)