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NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
Current content can be found at unidata.ucar.edu.
To learn about what's going on, see About the Archive Site.
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.htmlGDAL 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 *************************************************************
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