rgdal: is_proj_CDN_enabled – R documentation

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is_proj_CDN_enabled

PROJ search paths and content download network handling

Description

From PROJ 7 (and partly 7.1), it is becoming possible to use transformation grids downloaded on demand to improve coordinate operation accuracy from a content download network (CDN). These functions report on and control the use of the CDN.

Usage

is_proj_CDN_enabled()
enable_proj_CDN()
disable_proj_CDN()
proj_CDN_user_writable_dir()
get_proj_search_paths()
set_proj_search_paths(paths)

Arguments

paths

a character vector of existing directories

Details

The PROJ user-writable CDN directory is set as soon as the internal search path is queried, and for most uses, the default value will allow all programs using PROJ such as R packages, QGIS, GRASS, etc., to access any downloaded grids. Grids are checked for staleness at regular intervals. This directory may be set to a non-default value with the PROJ_USER_WRITABLE_DIRECTORY environment variable before rgdal (and any other package using PROJ) is loaded and attached, from PROJ >= 7.1.0.

Value

Logical values and/or character vector search paths, often NULL for earlier versions of PROJ.

Author(s)

Roger Bivand

References

https://cdn.proj.org/.

Examples

is_proj_CDN_enabled()
proj_CDN_user_writable_dir()
get_proj_search_paths()

rgdal

Bindings for the 'Geospatial' Data Abstraction Library

v1.5-23

GPL (>= 2)

Authors

Roger Bivand [cre, aut] (<https://orcid.org/0000-0003-2392-6140>), Tim Keitt [aut], Barry Rowlingson [aut, ctb], Edzer Pebesma [ctb], Michael Sumner [ctb], Robert Hijmans [ctb], Daniel Baston [ctb], Even Rouault [cph, ctb], Frank Warmerdam [cph, ctb], Jeroen Ooms [ctb], Colin Rundel [ctb]

Initial release

2021-02-03