Andrew,
Another approach would be to use the fabulous GDAL package
http://www.remotesensing.org/gdal/
which makes converting the Arc/Info ASCII grid to netcdf (GMT
conventions) as easy as:
gdal_translate arc_ascii.grd -of GMT gmt_grid.nc
GDAL can convert between these formats:
http://gdal.maptools.org/formats_list.html
GDAL can read CF NetCDF grids as well, but it looks like it doesn't
(yet?) support writing CF-compliant NetCDF. Perhaps someone from the
Galeon project knows more about the plans for GDAL & CF.
The easiest way (and what I do) to get GDAL built with all the goodies
is download "FWTOOLS" from
http://fwtools.maptools.org/
which is a complete binary distribution for both Linux and PC containing
GDAL as well as Python, OpenEv, Mapserver.
-Rich
--
Richard P. Signell
U.S. Geological Survey Phone: (508) 457-2229
384 Woods Hole Road Fax: (508) 457-2310
Woods Hole, MA 02543-1598
Don Murray wrote:
Hi Andrew-
Chase, Andrew wrote:
Hi Folks,
I'm trying to do something relatively simple, but I haven't been able to
find any examples of others doing it before me. Just thought I'd ask
here before going off and writing the code myself.
What I want to do is take a DEM stored in the ESRI ASCII Raster format
and convert it to a netcdf file. My ascii raster has the standard header
format like so:
ncols 5001
nrows 4001
xllcorner -125
yllcorner 34
cellsize 0.001
NODATA_value -9999
Anybody got some code to do this? :-)
If not, no biggee, just thought I'd ask.
The best way to do this would be to write an IO Service Provider
(IOSP) layer that would read in the file and create the netCDF
object. I'm not sure if there is any documentation on this,
but there are some other examples that you could probably follow.
There is code in VisAD to read in the ASCII Arc Grid format
into VisAD Data objects and it could be adapted to use for this
task. The source code is available at:
ftp://ftp.ssec.wisc.edu/pub/visad/visad_src-2.0.jar
in the visad.data.gis.AsciiArcGrid reader. It does not
handle any associated .prj files.
Don
*************************************************************
Don Murray UCAR Unidata Program
dmurray@xxxxxxxxxxxxxxxx P.O. Box 3000
(303) 497-8628 Boulder, CO 80307
http://www.unidata.ucar.edu/staff/donm
*************************************************************
==============================================================================
To unsubscribe netcdf-java, visit:
http://www.unidata.ucar.edu/mailing-list-delete-form.html
==============================================================================
