ursa (version 3.11.1)

ursa_crs: Extract and assign projection of raster images.

Description

Functions manipulate with $crs item of the ursaGrid object, which is embedded in the ursaRaster object (obj$grid$crs). Projection is specified in PROJ.4 notation.

Usage

ursa_crs(obj)
ursa_crs(obj, keepGrid = FALSE) <- value

Value

Extract function ursa_crs returns character value of $grid$crs item of ursaRaster object.

Replace function ursa_crs<- returns ursaRaster with modified $grid$crs item.

Arguments

obj

ursaRaster object. It is allowed ursaGrid object for ursa_proj (Extract) function.

keepGrid

Logical. Should sessional grid be changed after assignment. Default is FALSE.

value

Character sting in PROJ.4 format.

Author

Nikita Platonov

Details

Boath Extract and Replace functions ursa_proj() and ursa_proj4() are synonyms for ursa_crs.

Examples

session_grid(NULL)
a <- ursa_dummy(nband=1)
print(ursa_crs(a))
p4s <- "+init=epsg:3576"
ursa_crs(a) <- p4s
print(ursa_crs(a))
fname <- tempfile()
write_envi(a,fname)
a2 <- read_envi(fname,resetGrid=TRUE)
print(ursa_crs(a2))
# try(print(rgdal::CRSargs(sp::CRS(p4s)))) ## 'rgdal' is retired
envi_remove(fname)