Jornada Basin, Las Cruces, New Mexico

EROS DATA CENTER LEVEL-1 PRODUCT GENERATION SYSTEM
PRODUCT README: HDF FORMAT

TABLE OF CONTENTS

BACKGROUND
FORMAT
ORGANIZATION
NAMING CONVENTION
READING DATA
o DELIVERED ON TAPE
o DELIVERED ON CD-ROM
o DELIVERED VIA FILE TRANSFER PROTOCOL
EDC CONTACT
REFERENCES
APPENDIX
o ACRONYM LIST

BACKGROUND

The launch of the Landsat-7 satellite on April 15, 1999, marks the addition
of the latest satellite to the National Aeronautics and Space Administration's
Landsat satellite series. The Landsat-7 satellite carries the enhanced
thematic mapper plus (ETM+) sensor and is part of an ongoing mission to
provide quality remote sensing data in support of research and applications
activities. Information on the Landsat-7 Program, including information
about the Landsat-7 satellite, the ETM+ sensor, and Landsat-7 data collection,
is available in the "Landsat 7 Science Data Users Handbook." The
Hierarchical Data Format (HDF) files are described in detail in the
"Level 1 Product Output Files Data Format Control Book, Volume 5,
Book 2." See References.

FORMAT

The Landsat-7 data are provided in standard HDF for radiometrically corrected
(level-1R) products and for radiometrically and geometrically corrected
(level-1G) products. Data may be represented in both binary and American
Standard Code for Information Interchange (ASCII) formats. Bit and byte
ordering follow conventions set by the Institute of Electrical and Electronics
Engineers (IEEE) with the term "byte" being synonymous with octet as used
by the International Organization for Standardization. For more information
on HDF structures, visit the following Web sites:

HDFinfo at: http://www.hdfinfo.com/
The NCSA HDF Home Page at: http://hdf.ncsa.uiuc.edu/

ORGANIZATION

The Landsat-7 data files are stored separately from the HDF directory file,
which contains the file names and pointers for the data files. The level-1R
and level-1G image files are in absolute radiance units scaled to 16 bits
and 8 bits, respectively.

NAMING CONVENTION

Except for the calibration parameter file, the file naming convention for
HDF is as follows:

L7fppprrr_rrrYYYYMMDD_AAA.XXX

where

L7 indicates the Landsat-7 mission.

f indicates the ETM+ data format.

ppp indicates the starting path of the product.

rrr_rrr indicates the starting and ending rows of the product.

YYYYMMDD indicates the acquisition date of an image.

AAA indicates the file type:

B10 = band 1
B20 = band 2
B30 = band 3
B40 = band 4
B50 = band 5
B61 = band 6L (low gain)
B62 = band 6H (high gain)
B70 = band 7
B80 = band 8
CAL = internal calibrator (1R only)
GEO = geolocation (1R only)
HDF = HDF directory file
MSD = consensus MSCD (1R only)
MTA = LPS metadata (1R only)
MTL = LPGS metadata
PCD = consensus PCD (1R only)
SLO = scan line offset (1R only)

XXX indicates product type (L1R or L1G).

Calibration parameters are stored as ASCII text using an object data language
syntax developed by the Jet Propulsion Laboratory. The naming convention for
the calibration parameter file is derived from the file name assigned by the
Image Assessment System and is annotated as follows:

L7CPFYYYYMMDD_YYYYMMDD_nn

where

L7 indicates the Landsat-7 mission.

CPF indicates that it is a calibration parameter file.

YYYYMMDD_YYYYMMDD indicates the starting and stopping year, month,
and day of the CPF.

nn indicates the incrementing number within a 90-day period (01-99).

READING DATA

o Delivered On Tape

Data on 8-mm, high-density (Exabyte) tapes are tarred per IEEE POSIX
standard 1003.1, preserving file names. To read a tar tape on a
computer with a UNIX operating system, type:

tar -xvf /<device name>

Command key arguments include:

x indicates that the data are to be read from tape.
v requests verbose output (that is, processed file names will
be listed).
f indicates that the archive name is specified.

The device name is system specific and may specify a device such as
a tape drive or a file path. Specific parameters depend upon local
workstation configurations.

o Delivered On CD-ROM

Data files are not packed. ISO 9660 Level 2.

o Delivered Via File Transfer Protocol

Data files are not packed or compressed.

EDC CONTACT

EDC User Services
U.S. Geological Survey
EROS Data Center
47914 252nd Street
Sioux Falls, SD 57198-0001
USA
Voice: 605-594-6116
Fax: 605-594-6963
E-Mail: edc@eos.nasa.gov

REFERENCES

Irish, Richard, 1998, Landsat 7 science data users handbook: Greenbelt,
Maryland, Goddard Space Flight Center, electronic version,
http://ltpwww.gsfc.nasa.gov/IAS/handbook/handbook_toc.html

United States Geological Survey (USGS)/EROS Data Center (EDC), L1-409,
Level 1 Product Output Files Data Format Control
Book, Volume 5, Book 2, Revision 4, January 2000

Data Format Control Books may be revised periodically. Visit the
following document server:

http://edcwww.cr.usgs.gov/l1dhf/L7MMO/document.htm

Disclaimer: Any use of trade, product, or firm names is for descriptive
purposes only and does not imply endorsement by the U.S. Government.

APPENDIX

o ACRONYM LIST

ASCII -- American Standard Code for Information Interchange
CD-ROM -- Compact Disc-Read Only Memory
CPF -- Calibration Parameter File
EDC -- EROS Data Center
EROS -- Earth Resources Observation Systems
ESDIS -- Earth Science Data and Information System
ETM+ -- Enhanced Thematic Mapper Plus
HDF -- Hierarchical Data Format
IEEE -- Institute of Electrical and Electronics Engineers
LPGS -- Level-1 Product Generation System
LPS -- Landsat Processing System
MSCD -- Mirror Scan Correction Data
NCSA -- National Center for Supercomputing Applications
PCD -- Payload Correction Data