GDALDriver-class: Class "GDALDriver": GDAL Driver Object

In rgdal: Bindings for the 'Geospatial' Data Abstraction Library

Class "GDALDriver": GDAL Driver Object

Description

GDALDriver objects encapsulate GDAL file format drivers. GDALDriver inherits from GDALMajorObject-class.

Usage

getGDALDriverNames()
gdalDrivers()
getDriverName(driver)
getDriverLongName(driver)
getGDALVersionInfo(str = "--version")
getGDALCheckVersion()
getGDALwithGEOS()
rgdal_extSoftVersion()
get_cached_orig_PROJ_LIB()
get_cached_orig_GDAL_DATA()
get_cached_set_PROJ_LIB()
get_cached_set_GDAL_DATA()

Arguments

driver	An object inheriting from class 'GDALDriver'
str	A string, may be one of "--version", "VERSION_NUM", "RELEASE_DATE", "RELEASE_NAME"

Details

getGDALDriverNames, gdalDrivers:

returns all driver names currently installed in GDAL, with their declared create and copy status (some drivers can create datasets, others can only copy from a prototype with a different driver.

getDriverName:

returns the GDAL driver name associated with the driver object.

getDriverLongName:

returns a longer driver name.

getGDALVersionInfo:

returns the version of the GDAL runtime shared object.

getGDALCheckVersion:

checks the version of the GDAL headers used when building the package (GDAL_VERSION_MAJOR, GDAL_VERSION_MINOR) - if the two versions differ, problems may arise (the C++ API/ABI may have changed), and rgdal should be re-installed

getGDALwithGEOS:

because drivers may behave differently if GDAL itself was built with GEOS support, the function uses a heuristic to check whether GDAL has access to the GEOS Union function or not

get_cached_orig_PROJ_LIB, get_cached_orig_GDAL_DATA

The values of environment variables PROJ_LIB and GDAL_DATA as read when this package was loaded

get_cached_set_PROJ_LIB, get_cached_set_GDAL_DATA

If not "", the values set when loading this package to point to metadata files included in CRAN binary packages

Objects from the Class

Objects can be created by calls of the form new("GDALDriver", name, handle), where name: a string giving the name of a GDAL driver, handle: used internally; not for public consumption (default = NULL).

Slots

handle:

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

Extends

Class "GDALMajorObject", directly.

Methods

initialize

signature(.Object = "GDALDriver"): drivername: a string giving the name of a GDAL driver, handle: used internally; not for public consumption (default = NULL)

Note

Loading the rgdal package changes the GDAL_DATA environmental variable to the GDAL support files bundled with the package.

Author(s)

Timothy H. Keitt, modified by Roger Bivand

See Also

GDALMajorObject-class

Examples

gdalDrivers()
logo <- system.file("pictures/logo.jpg", package="rgdal")[1]
x <- new("GDALReadOnlyDataset", logo)
getDriver(x)
getDriverLongName(getDriver(x))
GDAL.close(x)

rgdal documentation built on May 18, 2023, 3:07 a.m.