Display a GDAL dataset — displayDataset • rgdal

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, ...)

Arguments

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()

Value

a list of the image data, the colour table, and the par() values on entry.

References

https://gdal.org/

Author

Tim Keitt

Examples

if (FALSE) {
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)
}