Message-ID: <BLU0-SMTP47066D45F097261969D600C7F90@phx.gbl>
Date: 2009-08-24T14:29:01Z
From: Darren Norris
Subject: GDAL Error - .grd not recognised as a supported file
Hi all,
I'm trying to work with the "ETOPO1 Global Relief Model", downloaded
from http://www.ngdc.noaa.gov/mgg/global/global.html .
I chose the netCDF format option, which from the readme should be most
appropriate for GDAL users.
Snip from discussions - http://n2.nabble.com/flip-raster-td1886005.html
"
I've posted new versions of ETOPO1 that GDAL can read properly (north is
north) on the ETOPO1 web page
(http://www.ngdc.noaa.gov/mgg/global/global.html), along with an
explanatory readme file (in each netcdf folder). I've also created and
posted geotiff versions of ETOPO1. Please let me know if any more
problems are encountered.
Thanks,
Barry Eakins
barry.eakins at noaa.gov
ETOPO1 1 Arc-Minute Global Relief Model
http://www.ngdc.noaa.gov/mgg/global/global.html
"
However it looks like rgdal can't read the file. Or am I doing something
wrong?
Can anyone suggest the simplest way to get this data into R (I'm
avoiding the geotif due to bad internet and possible memory limitations
on my PC)?
Many thanks,
Darren
input_file<-c("C:/Users/Darren/Documents/ecology and
conservation/SP/data_gis/RASTEr/ETOPO1_Ice_g_gdal.grd")
file.exists(input_file)
[1] TRUE
library(gdal)
readGDAL(input_file)
Error in .local(.Object, ...) :
GDAL Error 4: `C:/Users/Darren/Documents/ecology and
conservation/SP/data_gis/RASTEr/ETOPO1_Ice_g_gdal.grd' not recognised as
a supported file format.
R version 2.9.0 (2009-04-17)
i386-pc-mingw32
locale:
LC_COLLATE=English_United Kingdom.1252;LC_CTYPE=English_United
Kingdom.1252;LC_MONETARY=English_United
Kingdom.1252;LC_NUMERIC=C;LC_TIME=English_United Kingdom.1252
attached base packages:
[1] stats graphics grDevices utils datasets methods base
other attached packages:
[1] rgdal_0.6-8 sp_0.9-36
loaded via a namespace (and not attached):
[1] grid_2.9.0 lattice_0.17-22 tools_2.9.0