Class "GDALRasterBand"
Returns a two-dimensional array with data from a raster band, used internally within functions
getRasterData(dataset, band = NULL, offset = c(0, 0),
region.dim = dim(dataset), output.dim = region.dim,
interleave = c(0, 0), as.is = FALSE, list_out=FALSE)
getRasterTable(dataset, band = NULL, offset = c(0, 0),
region.dim = dim(dataset))
getProjectionRef(dataset, OVERRIDE_PROJ_DATUM_WITH_TOWGS84 = NULL, enforce_xy = NULL)
getRasterBand(dataset, band = 1)
getRasterBlockSize(raster)
toSigned(x, base)
toUnSigned(x, base)
get_OVERRIDE_PROJ_DATUM_WITH_TOWGS84()
set_OVERRIDE_PROJ_DATUM_WITH_TOWGS84(value)dataset |
An object inheriting from class 'GDALReadOnlyDataset' |
band |
The band number (1-based) to read from |
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 |
output.dim |
Number of rows and columns in the output data; if
smaller than |
interleave |
Element and row stride while reading data; rarely needed |
as.is |
If false, scale the data to its natural units; if the case of thematic data, return the data as factors |
list_out |
default FALSE, return array, if TRUE, return a list of vector bands |
raster |
An object of class GDALRasterBand |
x |
integer variable for conversion |
base |
If Byte input, 8, if Int16 or UInt16, 16 |
OVERRIDE_PROJ_DATUM_WITH_TOWGS84 |
logical value, default NULL, which case the cached option set by |
enforce_xy |
(PROJ6+/GDAL3+) either use global setting (default NULL) or override policy for coordinate ordering easting/x as first axis, northing/y as second axis. |
value |
logical value to set OVERRIDE_PROJ_DATUM_WITH_TOWGS84 |
getRasterData:retrieves data from the dataset as an array or list of bands; will try to convert relevant bands to factor if category names are available in the GDAL driver when returning a list.
getRasterTable:retrieves data from the dataset as data frame.
getProjectionRef:returns the geodetic projection in Well Known Text format.
getRasterBand:returns a raster band
getRasterBlockSize:returns the natural block size of the raster band. Use this for efficient tiled IO.
toSigned:used to convert a band read as unsigned integer to signed integer
toUnSigned:used to convert a band read as signed integer to unsigned integer
Objects can be created by calls of the form new("GDALRasterBand", dataset, band).
handle:Object of class "externalptr", from class "GDALMajorObject", used internally; not for public consumption
Class "GDALMajorObject", directly.
signature(x = "GDALRasterBand"): ...
signature(.Object = "GDALRasterBand"): ...
The OVERRIDE_PROJ_DATUM_WITH_TOWGS84 argument is used to revert GDAL behaviour to pre-1.8.0 status; from 1.8.0, any input datum may be discarded if the input also includes a towgs84 tag in conversion to the PROJ.4 representation, see https://trac.osgeo.org/gdal/ticket/4880 and https://lists.osgeo.org/pipermail/gdal-dev/2012-November/034550.html. The cached value of OVERRIDE_PROJ_DATUM_WITH_TOWGS84 will also be used in open.SpatialGDAL, sub.GDROD, and asGDALROD_SGDF, which do not have a suitable argument
Timothy H. Keitt, modified by Roger Bivand
logo <- system.file("pictures/logo.jpg", package="rgdal")[1]
x <- new("GDALReadOnlyDataset", logo)
plot(density(getRasterTable(x)$band1))
GDAL.close(x)Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.