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- hdf - Hierarchical Data Format library
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- {{{{HHHHDDDDFFFFLLLLIIIIBBBBDDDDIIIIRRRR}}}}////lllliiiibbbbmmmmffffhhhhddddffff....aaaa {{{{HHHHDDDDFFFFLLLLIIIIBBBBDDDDIIIIRRRR}}}}////lllliiiibbbbddddffff....aaaa
- {{{{HHHHDDDDFFFFLLLLIIIIBBBBDDDDIIIIRRRR}}}}////lllliiiibbbbjjjjppppeeeegggg....aaaa {{{{HHHHDDDDFFFFLLLLIIIIBBBBDDDDIIIIRRRR}}}}////lllliiiibbbbzzzz....aaaa
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- HDF is a multi-object file format that facilitates the
- transfer of various types of scientific data between
- machines and operating systems. Machines currently
- supported include the Cray, HP, Vax, Sun, IBM RS/6000,
- Silicon Graphics, Macintosh, and IBM PC computers. HDF
- allows self-definitions of data content and easy
- extensibility for future enhancements or compatibility with
- other standard formats. HDF includes Fortran and C calling
- interfaces,and utilities to prepare raw image of data files
- or for use with other NCSA software. The HDF library
- contains interfaces for storing and retrieving compressed or
- uncompressed 8-bit and 24-bit raster images with palettes,
- n-Dimensional scientific datasets and binary tables. An
- interface is also included that allows arbitray grouping of
- other HDF objects.
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- HDF supports the storing of both 8-bit and 24-bit raster
- images. As well as storing information about the dimensions
- and palette of a raster image, HDF supports raster image
- compression. In previous versions of HDF, Run-length
- encoding and Imcomp compression were both supported. With
- HDF> 3.3 JPEG compression is also available.
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- Scientific Data Sets (SDSs) are useful for storing n-
- Dimensional gridded data. The actual data in the dataset
- can be of any of the "standard" number types: 8, 16 and
- 32bit signed and unsigned integers and 32 and 64bit floating
- point values. In addition, a certain amount of meta-data
- can be stored with an SDS including:
-
- o The coordinate system to use when interpreting or displaying the data.
- o Scales to be used for each dimension.
- o Labels for each dimension and the dataset as a whole.
- o Units for each dimension and the data.
- o The valid max and min values for the data.
- o Calibration information for the data.
- o Fill or missing value information.
- o Ability of have more than one file open at a time.
-
-
-
- Page 1 (printed 12/16/98)
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- o A more general framework for meta-data within the SDS data-model
- (allowing 'name = value' styel meta-data).
- o Support for an "unlimited dimension" in the SDS data-model, making
- it possible to append planes to an array along one dimension.
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- Any object in an HDF file can have annotations associated
- with it. There are a number of types of annotations:
-
- o Labels are assumed to be short strings giving the "name" of a
- data object.
- o Descriptions are longer text segments that are useful for giving
- more indepth information about a data object
- o File annotations are assumed to apply to all of the objects in a
- single file.
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- The Vset module provides interfaces to two basic HDF
- building blocks. Vgroups are generic grouping elements
- allowing a user to associate related objects within an HDF
- file. As Vgroups can contain other Vgroups, it is possible
- to build a hierarchical file. Vdatas are data structures
- made up of fields and records. Data is organized into
- 'fields' within each Vdata. Each field is identified by a
- unique 'fieldname'. The type of each field may be any of
- the basic number types that HDF supports. Fields of
- different types may exist within the same Vdata.
-
- By combining Vdatas in Vgroups it is possible to represent
- higher level data constructs: mesh data, multi-variate
- datasets, sparse matrices, finite-element data,
- spreadsheets, splines, non-Cartesian coordinate data, etc.
-
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- HDF > 3.3 merges in the netCDF library produced by Unidata.
- The full netCDF library is supported as is a new "multi-
- file" SDS interface. Both of these interfaces can read old
- netCDF files and HDF files transparently.
-
-
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- All HDF routines require the header "hdf.h" to be included
- in the C source file. If using the SDS routines the header
- "mfhdf.h" should be included instead in in the C source
- file. Fortran programs should use "dffunc.inc" and
- "hdf.inc".
-
- To compile a program that makes HDF calls on most Unix
- platforms.
-
-
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- Page 2 (printed 12/16/98)
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-
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- HDFLIBDIR = /usr/local/lib/hdf
- HDFINC = /usr/local/include/hdf
-
- (FORTRAN):
- f77 myprog.f -I{HDFINC} -o myprog {HDFLIBDIR}/libmfhdf.a \
- {HDFLIBDIR}/libdf.a {HDFLIBDIR}/libjpeg.a {HDFLIBDIR}/libz.a
-
- (C):
- cc myprog.c -I{HDFINC} -o myprog {HDFLIBDIR}/libmfhdf.a \
- {HDFLIBDIR}/libdf.a {HDFLIBDIR}/libjpeg.a {HDFLIBDIR}/libz.a
-
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- The HDF WWW page is located at http://hdf.ncsa.uiuc.edu/
-
- For the vast majority of users, the "Users Guide" documents
- and the "Reference" manuals should be sufficient.
-
- You may download the documentation via ftp on NCSA's
- anonymous ftp server. (ftp.ncsa.uiuc.edu:/HDF). On anonymous
- ftp there the documentation is available in Postscript, PDF
- and MIF.
-
-
-
- VVVVEEEENNNNDDDDOOOORRRR
- NCSA Software Development Division
- Hierarchical Data Format Group
- 152 Computing Applications Bldg.
- 605 E. Springfield Ave.
- Champaign, IL 61820
-
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- 4.1
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- LLLLIIIICCCCEEEENNNNSSSSEEEE &&&& SSSSOOOOUUUURRRRCCCCEEEE AAAAVVVVAAAAIIIILLLLAAAABBBBIIIILLLLIIIITTTTYYYY
- UNIVERSITY OF ILLINOIS (UI), NATIONAL CENTER FOR
- SUPERCOMPUTING APPLICATIONS (NCSA), Software Distribution
- Policy for Public Domain Software
-
- NCSA HDF Version 4.1 source code and documentation are in
- the public domain, available without fee for education,
- research, non-commercial and commercial purposes. Users may
- distribute the binary or source code to third parties
- provided that this statement appears on all copies and that
- no charge is made for such copies.
-
- UI MAKES NO REPRESENTATIONS ABOUT THE SUITABILITY OF THE
- SOFTWARE FOR ANY PURPOSE. IT IS PROVIDED "AS IS" WITHOUT
- EXPRESS OR IMPLIED WARRANTY. THE UI SHALL NOT BE LIABLE FOR
-
-
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- Page 3 (printed 12/16/98)
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-
-
-
- ANY DAMAGES SUFFERED BY THE USER OF THIS SOFTWARE. The
- software may have been developed under agreements between
- the UI and the Federal Government which entitle the
- Government to certain rights.
-
- We ask, but do not require that the following message be
- include in all derived works:
-
- Portions developed at the National Center for
- Supercomputing
- Applications at the University of Illinois at Urbana-
- Champaign.
-
- By copying this program, you, the user, agree to abide by
- the conditions and understandings with respect to any
- software which is marked with a public domain notice.
-
- Acknowledgements: ----------------
-
- Portions of this software were developed by the Unidata
- Program at the University Corporation for Atmospheric
- Research, specifically the NETCDF distribution used.
-
- This product also includes software developed by the
- Independent JPEG Group, specifically the IJPEG library
- libjpeg.a.
-
- This product also includes software developed by Jean-loup
- Gailly and Mark Adler , specifically the ZLIB library
- libz.a.
-
- This product includes software developed by the University
- of California, Berkeley and its contributors.
-
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- CCCCOOOONNNNTTTTAAAACCCCTTTT &&&& HHHHEEEELLLLPPPP
- NCSA Software Deveopment Division
- Hierarchical Data Format Group
- email: hdfhelp@ncsa.uiuc.edu
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- hdf libraries
- ////uuuussssrrrr////llllooooccccaaaallll////bbbbiiiinnnn Location of most hdf utilities
- ////uuuussssrrrr////llllooooccccaaaallll////iiiinnnncccclllluuuuddddeeee////hhhhddddffff Location of include file hdf.h
- and others
-
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- SSSSEEEEEEEE AAAALLLLSSSSOOOO
- hhhhddddffffllllssss(1), hhhhddddffffppppaaaacccckkkk(1), hhhhddddffffuuuunnnnppppaaaacccc(1), hhhhddddpppp(1)
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- Page 4 (printed 12/16/98)
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