Class "SpatialGDAL"
Class for spatial attributes that have spatial locations on a (full) regular grid on file, not (yet) actually read.
## S3 method for class 'SpatialGDAL' open(con, ..., silent = FALSE, allowedDrivers = NULL, options=NULL) ## S3 method for class 'SpatialGDAL' close(con, ...) copy.SpatialGDAL(dataset, fname, driver = getDriver(dataset@grod), strict = FALSE, options = NULL, silent = FALSE)
con |
file name of grid map for opening, SpatialGDAL object for closing |
... |
other arguments (currently ignored) |
silent |
logical; if TRUE, comment and non-fatal CPL driver errors suppressed |
dataset |
object of class SpatialGDAL |
fname |
file name of grid map |
driver |
GDAL driver name |
strict |
TRUE if the copy must be strictly equivalent, or more normally FALSE indicating that the copy may adapt as needed for the output format |
allowedDrivers |
a character vector of suggested driver short names may be provided starting from GDAL 2.0 |
options |
driver-specific options to be passed to the GDAL driver; only available for opening datasets from GDAL 2.0 |
Objects can be created by calls of the form open.
SpatialGDAL(name), , where name is the name of
the GDAL file.
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
Class Spatial-class, directly.
signature(x = "SpatialGDAL", i, j, ...):
selects rows (i), columns (j), and bands (third argument); returns an object of
class SpatialGridDataFrame-class. Only the selection is actually read.
signature(i): reads band i and returns the values as a
numeric vector
Non-fatal CPL errors may be displayed for some drivers, currently for the AIG ArcInfo 9.3 binary raster driver using GDAL >= 1.6.2; the data has been read correctly, but the contents of the info directory did not meet the specifications used to reverse engineer the driver used in GDAL (see https://trac.osgeo.org/gdal/ticket/3031)
Edzer Pebesma, edzer.pebesma@uni-muenster.de
SpatialGridDataFrame-class, which is actually sub-classed.
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)Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.