On Mon, 30 Mar 2009, gianni lavaredo wrote:
Dear R user,
I have an ascii file (It's a raster in Arcmap) and I wish to import in R
to do some analisys. I am using like help
Zone_2644149 = readGDAL("Zone_2644149.asc")$band1
Zone_2644149.asc has GDAL driver AAIGrid
and has 246 rows and 381 columns
str(Zone_2644149)
num [1:93726] 35.1 34.7 35.2 35.9 31.2 ...
What about:
Zone_2644149 <- readGDAL("Zone_2644149.asc")
# to get a SpatialGridDataFrame (I think with a single band only for this
# format; selecting $band1 just returns the data in band1
fullgrid(Zone_2644149) <- FALSE
# to drop the cells with NA to get a SpatialPixelsDataFrame
# or Zone_2644149 <- as(Zone_2644149, "SpatialPixelsDataFrame")
If you say summary(Zone_2644149) first, you can check whether coercing
from SpatialGrid to SpatialPixels is justified by the number of NAs in
band1.
Hope this helps,
Roger
but I need to have a SpatialPixelsDataFrame but SORRY I haven't idea how to
import as SpatialPixelsDataFrame
thanks Gianni
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Roger Bivand
Economic Geography Section, Department of Economics, Norwegian School of
Economics and Business Administration, Helleveien 30, N-5045 Bergen,
Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43
e-mail: [email protected]
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