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There is a utility called CDFlist which will allow you to subset any portion of any CDF (e.g., on the GEDEX CD-ROM) by dimension (i.e., hyperslab), by value (for one or more variable), by record (i.e., equivalent to unlimited dimension) and by variable selection. The results may be placed into an ASCII file or another CDF. For Unix machines this utility and others requires a VT100 screen (i.e., xterm). The CDF distribution includes the library and these utilities and is available on anonymous ftp from ncgl.gsfc.nasa.gov. Supported platforms include SunOS, Ultrix, VMS, IRIX, AIX (i.e., that's what I typically use), HP-UX, DOS. I think MacOS and Unicos are in progress, but check the anon ftp. However, the CDFlist and other utilities should be on your GEDEX disk already built for several operating systems with some other tools for interfacing to the disk (DOS, HP-UX, IRIX, SunOS and VMS). They are on my copy... Therefore, creating a custom ASCII file for conversion is simple and you have the tools. Creating a CDF to netCDF converter and back is certainly doable and straightforward as long as one sticks to the subset of data types that are supported in both systems. Compensating for the differences is also possible but would require a more complex implementation. Lloyd Treinish ------------------------------- Referenced Note --------------------------- Received: from unidata.ucar.edu by watson.ibm.com (IBM VM SMTP V2R2) with TCP; Wed, 27 May 1992 03:42:24 EDT Received: by unidata.ucar.edu id AA02035 (5.65c/IDA-1.4.4 for netcdfgroup-send); Wed, 27 May 1992 00:58:44 -0600 Received: from shark.mel.dit.CSIRO.AU by unidata.ucar.edu with SMTP id AA02031 (5.65c/IDA-1.4.4 for <netcdfgroup@xxxxxxxxxxxxxxxx>); Wed, 27 May 1992 00:58:38 -0600 Received: from atmos.dar.csiro.au by shark.mel.dit.csiro.au with SMTP id AA03128 (5.65c/IDA-1.4.4/DIT-1.3 for <@shark.mel.dit.CSIRO.AU:netcdfgroup@xxxxxxxxxxxxxxxx>); Wed, 27 May 1992 16:58:33 +1000 Received: by atmos.dar.csiro.au (5.65+bind 1.5+ida/910805.SGI/DAR) for @shark.mel.dit.CSIRO.AU:netcdfgroup@xxxxxxxxxxxxxxxx id AA20207; Wed, 27 May 1992 16:58:04 +1000 Message-Id: <9205270658.AA20207@xxxxxxxxxxxxxxxxxx> We have NASA GEDEX (Greenhouse Effect Detection Experiment) CD's. These contain files in CDF format. There are some utilities on the CD's, but apparently none that convert to netCDF or provide a practical way of going via ASCII. Does anyone have a utility for converting CDF files to netCDF? Does anyone have a utility for extracting a hyperslab from a CDF file & printing it in ASCII? Does anyone have any other suggestions? Harvey Davies, CSIRO Division of Atmospheric Research, Voice: +61 3 586 7574 Private Bag No. 1, Mordialloc, Fax: +61 3 586 7600 Victoria 3195, Australia Internet: hld@xxxxxxxxxxxx
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