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i NCSA HDF Specifications
Table of Contents i
National Center for Supercomputing Applications
March 1989
Table of Contents
Introduction
Overview vii
What Is HDF vii
Use of This Manual ix
Chapter 1 The Basic Structure of HDF Files
Chapter Overview 1.1
File Header 1.1
Data Object 1.1
Physical Organization of HDF Files 1.4
Sample HDF File 1.4
Chapter 2 The NCSA HDF General Purpose Interface
Chapter Overview 2.1
Introduction 2.1
Opening and Closing Files 2.1
Finding Tags, Refs, and Element Lengths 2.1
Reading and Writing Entire Data Elements 2.2
Reading and Writing Part of a Data Element 2.2
Manipulating Data Descriptors (DDs) 2.2
Chapter 3 Sets and Groups
Chapter Overview 3.1
Sets 3.1
Groups 3.2
Raster Image Sets 3.4
Scientific Datasets 3.6
Chapter 4 HDF Conventions
Chapter Overview 4.1
Byte Order 4.1
Naming and Assigning Tags 4.1
Using Reference Numbers to Organize Data
Objects 4.2
Multiple References and File Compaction 4.3
Chapter 5 Other Formats
Chapter Overview 5.1
File Formats 5.1
Appendix A NCSA HDF Tags
Appendix B Header Files
Glossary
Figures and Tables
Figure 1 Raster Image Sets in an HDF File viii
Figure 1.1 Three Data Objects 1.1
Figure 1.2 A Data Descriptor 1.2
Figure 1.3 Model of a Data Descriptor Block 1.3
Figure 1.4 Sample Data Descriptor Block 1.4
Figure 1.5 Physical Representation of Data
Objects╩╩1.5
Figure 3.1 Physical Organization of Sample RIG
Groupings 3.3
Figure B.1 Fortran Header File: dfF.h B.2╨B.3
Figure B.2 C Header File: df.h B.4╨B.8
Table 1.1 Parts of a Data Descriptor 1.2
Table 1.2 Summary of the Relationships among
Parts of an HDF File 1.4
Table 1.3 Sample Data Objects in an HDF File 1.5
Table 3.1 Tags for Raster-8 Sets 3.4
Table 3.2 Tags for Raster Image Sets 3.5
Table 3.3 Additional Tags for Raster Image Sets 3.6
Table 3.4 Required Tags for Scientific Datasets 3.6
Table 3.5 Optional Tags for Scientific Datasets 3.7
Table 4.1 Sample Grouping of Data Objects in an
HDF File 4.2
Table A.1 Number Type Fields A.4
Table A.2 Number Type Values A.4
Table A.3 Possible Machine Types A.5
Table A.4 Possible Tag Types in an RIG A.7
Table A.5 Dimension Record Fields A.8
Table A.6 Color Correction Field Types A.9
Table A.7 Color Format String Values A.9
Table A.8 Possible Tag Types in an SDG A.12
Table A.9 Scientific Data Dimension Record
Fields╩╩A.12