Class "SpatialGDAL"

Description

Class for spatial attributes that have spatial locations on a (full) regular grid on file, not (yet) actually read.

Objects from the Class

Objects can be created by calls of the form open. SpatialGDAL(name), , where name is the name of the GDAL file.

Slots

points:

see SpatialPoints; points slot which is not actually filled with all coordinates (only with min/max)

grid:

see GridTopology-class; grid parameters

grid.index:

see SpatialPixels-class; this slot is of zero length for this class, as the grid is full

bbox:

Object of class "matrix"; bounding box

proj4string:

Object of class "CRS"; projection

data:

Object of class data.frame, containing attribute data

Extends

Class "Spatial", directly.

Methods

[

signature(x = "SpatialGDAL", i, j, ...): selects rows (i), columns (j), and bands (third argument); returns an object of class SpatialGridDataFrame. Only the selection is actually read.

[[

signature(i): reads band i and returns the values as a numeric vector

Author(s)

Edzer J. Pebesma, e.pebesma@geo.uu.nl

See Also

SpatialGridDataFrame-class, which is actually sub-classed.

Examples

x <- open.SpatialGDAL(system.file("external/test.ag", package="sp")[1])
image(x[])
image(as(x, "SpatialGridDataFrame"))
summary(as(x, "SpatialGridDataFrame"))
spplot(as(x, "SpatialGridDataFrame"))
# select first 50 rows:
summary(x[1:50])
# select first 50 columns:
summary(x[,1:50])
# select band 1:
summary(x[,,1])
# select first 50 rows, first 50 columns, band 1:
summary(x[1:50,1:50,1])
# get values of first band:
summary(x[[1]])
close(x)