ursa (version 3.9.4)

open_gdal: Open GDAL file

Description

open_gdal creates object of ursaRaster class, and prepares connections for data reading.

Usage

open_gdal(fname, verbose = FALSE)
ursa_open(fname, verbose = FALSE)

Arguments

fname

Character. Filename; full-name or short-name.

verbose

Logical. verbose=TRUE provides some additional information on console. Default is FALSE.

Value

Returns object of class ursaRaster. Values are not in memory.

Details

ursa_open is a synonym to open_gdal. Generally, both function names are abridged version of ursa_open_dgal.

open_gdal doesn't read data. Data can be read later using Extract operator [.

If argument fname is ENVI .hdr Labelled Raster then either open_gdal or open_envi can be used. The former provides external implementation for data reading via GDAL in rgdal package.

See Also

close, open_envi, read_gdal.

Examples

# NOT RUN {
session_grid(NULL)
fname1 <- system.file("pictures/cea.tif",package="rgdal")
message(fname1)
a1 <- open_gdal(fname1)
print(a1)
print(a1[])
close(a1)
fname2 <- system.file("pictures/test_envi_class.envi",package="rgdal")
message(fname2)
b1 <- open_gdal(fname2)
b2 <- open_envi(fname2)
print(b1)
print(b2)
print(c('The same grid?'=identical(ursa_grid(b1),ursa_grid(b2))
       ,'The same data?'=identical(ursa_value(b1[]),ursa_value(b2[]))))
close(b1,b2)
# }