Experience with an Enhanced NetCDF Data Model and 课件.ppt

下载文档

0
0
约3.14千字
约 15页
2019-04-23 发布于湖北
举报
版权申诉
保障服务

Experience with an Enhanced NetCDF Data Model and 课件.ppt

1、本文档共15页，可阅读全部内容。
2、原创力文档（book118）网站文档一经付费（服务费），不意味着购买了该文档的版权，仅供个人/单位学习、研究之用，不得用于商业用途，未经授权，严禁复制、发行、汇编、翻译或者网络传播等，侵权必究。
3、本站所有内容均由合作方或网友上传，本站不对文档的完整性、权威性及其观点立场正确性做任何保证或承诺！文档内容仅供研究参考，付费前请自行鉴别。如您付费，意味着您自己接受本站规则且自行承担风险，本站不退款、不进行额外附加服务；查看《如何避免下载的几个坑》。如果您已付费下载过本站文档，您可以点击这里二次下载。
4、如文档侵犯商业秘密、侵犯著作权、侵犯人身权等，请点击“版权申诉”（推荐），也可以打举报电话：400-050-0827(电话支持时间：9:00-18:30)。

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