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HDF(1) HDF(1)
NAME
hdf - Hierarchical Data Format library
SYNOPSIS
-lmfhdf -ldf -ljpeg -lz
{HDFLIBDIR}/libmfhdf.a {HDFLIBDIR}/libdf.a {HDFLIBDIR}/libjpeg.a {HDFLIBDIR}/libz.a
DESCRIPTION
HDF is a multi-object file format that facilitates the transfer of various types of scien-
tific 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 inter-
faces,and utilities to prepare raw image of data files or for use with other NCSA soft-
ware. The HDF library contains interfaces for storing and retrieving compressed or uncom-
pressed 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.
HDF Raster Images
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.
HDF Scientific Data Sets
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.
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.
HDF Annotations
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.
HDF Vset Interfaces
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.
HDF > 3.3 and netCDF
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.
EXAMPLES
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.
HDFINC = /usr/include/hdf
(FORTRAN):
f77 myprog.f -I{HDFINC} -o myprog -lmfhdf -ldf -ljpeg -lz
(C):
cc myprog.c -I{HDFINC} -o myprog -lmfhdf -ldf -ljpeg -lz
DOCUMENTATION
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.
VENDOR
NCSA Software Development Division
Hierarchical Data Format Group
152 Computing Applications Bldg.
605 E. Springfield Ave.
Champaign, IL 61820
VERSION
4.1
LICENSE & SOURCE AVAILABILITY
UNIVERSITY OF ILLINOIS (UI), NATIONAL CENTER FOR SUPERCOMPUTING APPLICATIONS (NCSA), Soft-
ware 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 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 cer-
tain 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 understand-
ings 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 Corpora-
tion 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 , specif-
ically the ZLIB library libz.a.
This product includes software developed by the University of California, Berkeley and its
contributors.
CONTACT & HELP
NCSA Software Deveopment Division
Hierarchical Data Format Group
email: hdfhelp AT ncsa.edu
FILES
/usr/lib/hdf/{libmfhdf,libdf,libjpeg,libz}.{a,so}
hdf libraries
/usr/bin Location of most hdf utilities
/usr/include/hdf Location of include file hdf.h and others
SEE ALSO
hdfls(1), hdfpack(1), hdfunpac(1), hdp(1)
NCSA HDF 4.1 July 1996 HDF(1)
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On Apache
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