I tried this, and AAIGrid is not available for creation by rgdal on my
machine. See gdalDrivers() for those available.
If you install FWTools you can use a workaround to convert the export
externally, e.g.
x <- readGDAL(system.file("external/test.ag", package="sp")[1])
## write to GeoTIFF
writeGDAL(x, "mes01jan.tif", type = "Byte")
## convert externally to AAIGrid
system("gdal_translate mes01jan.tif mes01jan.asc -of AAIGrid -ot Byte")
## check result
system("gdalinfo mes01jan.asc")
I don't believe that AAIGrid can explicitly support type Byte without
augmentation, so I would carefully check the coercion that occurs (if
it's actually needed).
Cheers, Mike.
milton ruser wrote:
Dear all,
I am reading a set of maps from ArcGRID format using rgdal and I need to
export to ASC format.
But when I try the commands below, I get an error.
require(rgdal)
mes01jan<-readGDAL("jan_00")
image(mes01jan, col=topo.colors(50)) #looks find
writeGDAL(mes01jan, "mes01jan.asc", drivername = "AAIGrid", type="Byte")
Any idea?
miltinho, brazil
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