Display a GDAL dataset
Display a GDAL dataset allowing for subscenes and decimation, allowing very large images to be browsed
displayDataset(x, offset=c(0, 0), region.dim=dim(x), reduction = 1, band = 1, col = NULL, reset.par = TRUE, max.dim = 500, ...)
x |
a three-band GDALReadOnlyDataset object |
offset |
Number of rows and columns from the origin (usually the upper left corner) to begin reading from; presently ordered (y,x) - this may change |
region.dim |
The number of rows and columns to read from the dataset; presently ordered (y,x) - this may change |
reduction |
a vector of length 1 or 2 recycled to 2 for decimating the input data, 1 retains full resultion, higher values decimate |
band |
The band number (1-based) to read from |
col |
default NULL, attempt to use band colour table and default to grey scale if not available |
reset.par |
default TRUE - reset par() settings on completion |
max.dim |
default 500, forcing the image to a maximum dimension of the value |
... |
arguments passed to image.default() |
a list of the image data, the colour table, and the par() values on entry.
Tim Keitt
## Not run:
logo <- system.file("pictures/Rlogo.jpg", package="rgdal")[1]
x <- GDAL.open(logo)
opar <- par(no.readonly=TRUE)
par(mfrow=c(2,2))
displayDataset(x, band=1, reset.par=FALSE)
displayDataset(x, band=2, reset.par=FALSE)
#displayDataset(x, band=3, reset.par=TRUE)
par(opar)
dx <- RGB2PCT(x, band=1:3)
displayDataset(dx, reset.par=FALSE)
GDAL.close(x)
GDAL.close(dx)
## End(Not run)Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.