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Experience with an Enhanced NetCDF Data Model and 课件.ppt

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Experience with an Enhanced NetCDF Data Model and Interface for Scientific Data Access E. Hartnett, and Russell K. Rew Unidata/UCAR, POB 3000, Boulder, CO, 80307 ed@, russ@ 24th Conference on IIPS, 88th Annual Meeting of the American Meteorology Society, January 20-24, 2008 精品文档 What is NetCDF-4? Next major release of netCDF library. Fully backward compatible for data and software. Allows user to write/read netCDF-4/HDF5 files with the netCDF API. Depends on HDF5 1.8.0 release. Available for use (in beta release) from Unidata. Expands the netCDF data model. 精品文档 NetCDF-4 C/F77/F90/C++ Architecture NetCDF-4 C NetCDF-3 C NetCDF classic NetCDF-4/HDF5 HDF5 1.8.0 zlib NetCDF 64-bit offset F77 CXX F90 User App. 精品文档 Getting and Building NetCDF-4 NetCDF-4 requires zlib and HDF5-1.8.0. These must be installed first. Until HDF5-1.8.0 release, netCDF-4 works with a specific HDF5 release or snapshot (currently beta5). It wont work with earlier HDF5 releases. Data produced with beta releases will be fully supported. Get zlib, HDF5, and netCDF-4 release from netCDF-4 snapshot page: /software/netcdf/builds/snapshot/netcdf-4/ 精品文档 The NetCDF Classic Data Model Variable Attribute Attribute Variable Attribute Attribute Attribute Attribute Variable – n-dimensional array of char, byte, short, int, float, or double. Dimension – shared axis. Attribute – 1D array of annotation to variable or file. 精品文档 Classic Model NetCDF-4 Files If possible, stick to the classic model. Existing software, linked with netCDF-4, will transparently handle netCDF-4 files, if they conform to the classic model. In classic model files, there can be no user-defined types, groups, or multiple unlimited dimensions. There can be chunking, compression, parallel I/O, large object sizes, endianness. NetCDF-4 files which must conform to the classic model may be created with the CLASSIC_MODEL flag in the file creation call. 精品文档 Compression Compression per variable Deflate setting from 1-9 Happens as data are wri