Of course, you can use write.asciigrid() in package sp for a more
immediate workaround (sorry for not thinking of this previously!):
e.g.
x <- readGDAL(system.file("external/test.ag", package="sp")[1])
## be aware that only the first raster column will be written by attr = 1
write.asciigrid(x, "mes01jan.asc")
## which on my machine results in
system("gdalinfo mes01jan.asc")
Driver: AAIGrid/Arc/Info ASCII Grid
Files: mes01jan.asc
mes01jan.asc.aux.xml
Size is 80, 115
Coordinate System is `'
Origin = (178400.000000000000000,334000.000000000000000)
Pixel Size = (40.000000000000000,-40.000000000000000)
Corner Coordinates:
Upper Left ( 178400.000, 334000.000)
Lower Left ( 178400.000, 329400.000)
Upper Right ( 181600.000, 334000.000)
Lower Right ( 181600.000, 329400.000)
Center ( 180000.000, 331700.000)
Band 1 Block=80x1 Type=Float32, ColorInterp=Gray
NoData Value=-9999
Sorry for all the unnecessary email traffic . . .
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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