open_gdal | R Documentation |
open_gdal
creates object of ursaRaster
class, and prepares connections
for data reading.
open_gdal(fname, verbose = FALSE) ursa_open(fname, verbose = FALSE)
fname |
Character. Filename; full-name or short-name. |
verbose |
Logical. |
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.
Returns object of class ursaRaster
. Values are not in memory.
Nikita Platonov platonov@sevin.ru
close
, open_envi
, read_gdal
.
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)
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