conn.write_gdal: Write raster image to GDAL file(s)

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

Description

write_gdal writes in-memory object of class ursaRaster to disk using GDAL from rgdal package.

Usage

write_gdal(obj, ...)
ursa_write(obj, fname)

Arguments

obj	Object of class ursaRaster.
...	Arguments, which are passed to create_gdal. Usually, only file name with extension (character) is required. If extension is ".envi", then GDAL driver "ENVI" is used. If extension is ".tif", then GDAL driver "GTiff" is used. If extension is ".img", then GDAL driver "HFA" is used. If extension is ".jpg" or "*.jpeg", then GDAL driver "JPEG" is used. If extension is ".bmp", then GDAL driver "BMP" is used. If extension is ".png", then GDAL driver "PNG" is used. Additionally, argument driver should be specified. If argument ... is missing, then occasional name is assigned.
fname	Character. File name with extension.

Details

ursa_write is simplified call of write_gdal.

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

a <- create_gdal(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_gdal, Replace method [<- for ursaRaster object, close method for ursaRaster object.

write_envi

Examples

session_grid(NULL)
ftemp <- tempfile(pattern="",fileext="")
fpath <- dirname(ftemp)
fname <- basename(ftemp)
a <- round(ursa_dummy(1,min=0,max=255,nodata=NA))
write_envi(a,file.path(fpath,paste0(fname,"_1",".envi")))
write_gdal(a,file.path(fpath,paste0(fname,"_2")))
write_gdal(a,file.path(fpath,paste0(fname,"_3",".tif")))
write_gdal(a,file.path(fpath,paste0(fname,"_4")),driver="EHdr")
flist <- dir(path=fpath,pattern=fname,full.names=TRUE)
file.remove(flist)
blist <- basename(flist)
res <- NULL
for (i in seq(4))
   res <- c(res,paste(grep(paste0("_",i),blist,value=TRUE),collapse=" "))
print(res)

ursa documentation built on Feb. 26, 2020, 3:01 p.m.