conn.write_envi: Write raster image to ENVI .hdr Labelled Raster file.

In nplatonov/ursa: Non-Interactive Spatial Tools for Raster Processing and Visualization

Write raster image to ENVI .hdr Labelled Raster file.

Description

write_envi writes in-memory object of class ursaRaster to disk in the ENVI .hdr Labelled Raster file format.

Usage

write_envi(obj, ...)

Arguments

obj	Object of class ursaRaster.
...	Arguments, which are passed to create_envi. Usually, only file name (character) is required. If missing, then occasional name is assigned.

Details

write_envi implements writing the whole ursaRaster object to disk. For multiple access to disk (by chunks), use followed construction:

a <- create_envi(fname)
a[condition_1] <- value1
a[condition_2] <- value2
...
close(a)

Value

Integer code of ENVI data type. See values of the “data type” field in description of the ENVI Header Format.

Author(s)

Nikita Platonov [e-mail]

See Also

create_envi, Replace method [<- for ursaRaster object, close_envi (close for ursaRaster object).

write_gdal(...,driver="ENVI") uses GDAL (rgdal) for writing ursaRaster object to the ENVI .hdr Labelled Raster file.

Examples

session_grid(NULL)
dir.create(tmpWD <- file.path(tempdir(),"certain"))
wd <- setwd(tmpWD)
print(c('temp dir'=session_tempdir(),'working dir'=getwd()))
list1a <- envi_list(session_tempdir())
list1b <- envi_list()
fname <- tempfile(tmpdir=".")
a <- ursa_dummy()
bandname(a) <- c("first","second","third")
write_envi(a)
write_envi(a,fname)
list2a <- envi_list(session_tempdir())
list2b <- envi_list()
fname1 <- list2a[!(list2a %in% list1a)]
fname2 <- list2b[!(list2b %in% list1b)]
print(c('in temp dir'=fname1,'in working dir'=fname2))
a2 <- open_envi(fname1)
print(a2)
close(a2)
envi_remove(c(fname1,fname2))
setwd(wd)

nplatonov/ursa documentation built on May 8, 2024, 6:02 p.m.