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DRAFT netCDF/ HDF Design Document > CDF > NetCDF grew out of the experience of CDF (common Data Format), developed at > NASA. > As far as the netCDF/ HDF effort is concerned, the main difference between > netCDF and > CDF is that CDF stores each variable object in a seperate file, whereas > netCDF stores > all of its data in a single file. It is a secondary goal to also support > CDF. Such > support will not be part of the initial release. This statement is not correct. CDF allows for single file OR multi file implementations, and has done so for over a year. The multi file is used in some cases because it is a bit faster. CDF also has host and network incodings. A CDF can be converted from a portable binary format to a format that is a native binary format of the machine the CDF is on. The main difference between netCDF and CDF is in the tools. The NASA CDF format has tools to subset any CDF into any dimension on many platforms. For example if I have a global CDF with DATE,LAT,LON, and TEMP variables in a CDF I can enter a subset of DATE,LAT,LON and generate a flat ASCII file or a smaller CDF. The tools work on SUN, HP, SGI, VMS, CRAY, IBM, and DOS. There is a port in progress to port the software to the MAC. CDF also has graphic tools to view CDF data. One of these tools, CXIT, currently runs under X and will be released soon for the MAC. We have a current CD-ROM with this CDF data that contains over sixty GEDEX data sets. Sixty of the most important climate change data sets, over 1100 mb of data on two CD-Roms. The CD-Rom is free of charge. The tools run on SUN, HP, SGI, VMS, and DOS. All software is on the CD-ROM. The software will allow the user to quickly extract data from the CD-Rom into ASCII files. For more information on the GEDEX CD-ROM contact NCDS USO at NCDSUSO@xxxxxxxxxxxxxxxxxxxx For more information on CDF contact CDFSUPPORT@xxxxxxxxxxxxxxxxxxxx Hank Griffioen