GDALRasterBand-class {rgdal}R Documentation

Class "GDALRasterBand"

Description

Returns a two-dimensional array with data from a raster band, used internally within functions

Usage

getRasterData(dataset, band = NULL, offset = c(0, 0),
              region.dim = dim(dataset), output.dim = region.dim,
              interleave = c(0, 0), as.is = FALSE) 

getRasterTable(dataset, band = NULL, offset = c(0, 0), region.dim = dim(dataset))

getProjectionRef(dataset)

getRasterBand(dataset, band = 1)

getRasterBlockSize(raster)

Arguments

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 region.dim the data will be subsampled
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
raster An object of class GDALRasterBand

Details

getRasterData:
retrieves data from the dataset as array.
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.

Objects from the Class

Objects can be created by calls of the form new("GDALRasterBand", dataset, band).

Slots

handle:
Object of class "externalptr", from class "GDALMajorObject", used internally; not for public consumption

Extends

Class "GDALMajorObject", directly.

Methods

dim
signature(x = "GDALRasterBand"): ...
initialize
signature(.Object = "GDALRasterBand"): ...

Author(s)

Timothy H. Keitt, modified by Roger Bivand

See Also

See also GDALDriver-class, GDALDataset-class, GDALTransientDataset-class

Examples

logo <- system.file("pictures/logo.jpg", package="rgdal")[1]
x <- new("GDALReadOnlyDataset", logo)
plot(density(getRasterTable(x)$band1))
GDAL.close(x)
[Package rgdal version 0.5-30 Index]