        USGS NATIONAL LAND ARCHIVE PRODUCTION SYSTEM 
                    PRODUCT README: NDF

TABLE OF CONTENTS

INTRODUCTION
FORMAT
ORGANIZATION
* DATA FILE NAMES
* README
* READING DATA
GENERAL INFORMATION and DOCUMENTATION
ORDER SUPPORT
DISCLAIMER


INTRODUCTION

This product was created by the U.S. Geological Survey (USGS) 
and contains Landsat data files in standard National Land 
Archive Processing System (NLAPS) Data Format (NDF).  

The Landsat 1, 2, and 3 satellites carried the Multispectral 
Scanner (MSS) sensor; the Landsat 4 and 5 satellites carry 
both the MSS and the Thematic Mapper (TM) sensors; and the 
Landsat 7 satellite carries the Enhanced Thematic Mapper Plus 
(ETM+) sensor. All three sensors are a part of an ongoing mission 
to provide quality remote sensing data in support of research 
and applications activities. 

For information on MSS products (Landsats 1-5): 
http://eros.usgs.gov/products/satellite/mss.html

For information on TM products (Landsats 4-5):
http://eros.usgs.gov/products/satellite/tm.html

For information on ETM+ products (Landsat 7):
http://eros.usgs.gov/products/satellite/landsat7.html

For information on the Landsat project, missions, and data acquisitions: 
http://landsat.usgs.gov

For detailed information on the Landsat 7 satellite, the ETM+ sensor, 
and Landsat 7 data products, see the Landsat 7 Science Data Users Handbook: 
http://ltpwww.gsfc.nasa.gov/IAS/handbook/handbook_toc.html


FORMAT

Landsat data are provided in NDF for radiometrically and 
geometrically corrected (Level-1G systematically corrected) 
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. 

The NDF file format is described in the National Land Archive 
Production System (NLAPS) Systematic Format Description Document:
http://landsat.usgs.gov/resources/files/NLAPS_II.pdf


ORGANIZATION

The product composition for geometrically and radiometrically 
corrected Landsat data includes a header file, image files, a 
work order report file, and a history and processing 
parameters file. The data is provided in band sequential (BSQ) 
format (i.e., each band is stored in a separate image file, 
and scan lines are sequentially written to the same image file).

Geometrically corrected products which have had terrain 
correction applied, may also contain a digital elevation 
model (DEM) header file and a DEM File containing the 
terrain model used to correct the product.

The Landsat data files are stored separately from the NDF 
directory file, which contains the file names and pointers 
for the data files.  The Level-1R files are in absolute 
radiance units scaled to 16 bits.  The Level-1G image files 
are in 8-bit (unsigned integer) digital numbers (DN).

     NDF Product Composition:

     NDF products are written to disk by NLAPS and conform to 
     the naming standards defined below. Products are formatted 
     as though they are being written to a single physical 
     volume.  Up to six file types are included with each NDF 
     product. One or more image header files describe the 
     product delivered and provide necessary information for 
     further processing. One or more image files contain the 
     binary image data. If a DEM is used for terrain correction, 
     a DEM header and DEM image file may be included as well.  
     Also, each NDF product includes a work order report file 
     and a history file indicating processing parameters.  

     Image and DEM Header File Format:  

     The image and DEM header files contain information 
     describing the image data in the image or DEM files. The 
     format is similar to the EOSAT Fast Format header file 
     ("Earth Observation Satellite Company (EOSAT) Fast Format 
     Document for Digital Products - Version C,  Effective 
     April 23, 1996 [Revised July 29, 1996]" ) but is more 
     general in the support for additional sensors, DEM data, 
     and non-satellite imagery that are included.  The header 
     file is intended to be easy to read and uses only ASCII-text 
     to represent information (i.e., there is no binary 
     information in the header).

     In order to accommodate multi-resolution products, one 
     header file is written for each resolution in the output 
     product. This is in contrast to previous versions of the 
     NDF format in which all data files in the same volume 
     (data set) were required to have the same pixel spacing 
     and pixel format, with different resolutions requiring a 
     separate volume set. 

     Image and DEM Files: 

     The image and DEM files contain the raw image pixels or 
     elevation samples. There are no header records within 
     the file, nor are there any prefix and/or suffix data to 
     the individual image records. If the image file is part 
     of a BSQ product, then it contains information for only 
     one band, and the image lines for that band are stored 
     sequentially.    

* DATA FILE NAMES 

     NDF file name formats  defines the naming convention for 
     the file types that may be produced with an NDF-format 
     product. 
 _____________________________________________________________
|File type                 |  Format                          |
|__________________________|__________________________________|
|                          |                                  |
|Header files for imagery  |  <SceneID>.H<header file #>,     |
|                          |  where <SceneID> reflects the    |
|                          |  acquisition footprint and       |
|                          |  <header file #> is 1 for        |
|                          |  single-resolution footprint and |
|                          |  increments from 1 for each      |
|                          |  header file in a multi-         |
|                          |  resolution footprint.           |
|__________________________|__________________________________|
|                          |                                  |
|Image files               |  <SceneID >.I<band #>, where     |
|                          |  <SceneID> is as above and       |
|                          |  <band #> is an integer ranging  |
|                          |  from 1 to the number of bands   |
|                          |  in the product for BSQ.         |
|__________________________|__________________________________|
|                          |                                  |
|Work order report files   |  <SceneID>.WO, where <SceneID>   |
|                          |  is as above and a WO suffix is  |
|                          |  appended.                       |
|__________________________|__________________________________|
|                          |                                  |
|History and processing    |  <SceneID>.HI, where <SceneID>   |
|parameters files          |  is as above and a HI suffix     |
|                          |  references the history and      |
|                          |  processing parameters used to   |
|                          |  process this product.           |
|__________________________|__________________________________|
|                          |                                  |
|Header files for DEM data |  <SceneID>.DH, where <SceneID>   |
|                          |  is as above and a DH suffix     |
|                          |  references the DEM header       |
|                          |  (optional)                      |
|__________________________|__________________________________|
|                          |                                  |
|DEM data files            |  <SceneID>.DD, where <SceneID>   | 
|                          |  is as above and DD suffix       |
|                          |  references the DEM data         |
|                          |  (optional).                     |
|__________________________|__________________________________|


     Sample Product Band and File Combinations - ETM+

 _______________________________________________________________
| ETM+  |Resolution(s)|    File    |Header Files |Image Files  |
| Bands |             |Organization|             |             |
|  in   |             |            |             |             |
|Product|             |            |             |             |
|_______|_____________|____________|____________ |_____________|
|1-5, 7 |30           |BSQ         |<SceneID>.H1 |<SceneID>.I1 |
|6, 9   |60           |            |<SceneID>.H2 |<SceneID>.I2 |
|8      |15           |            |<SceneID>.H3 |<SceneID>.I3 |
|       |             |            |             |<SceneID>.I4 |
|       |             |            |             |<SceneID>.I5 |
|       |             |            |             |<SceneID>.I6 |
|       |             |            |             |<SceneID>.I7 |
|       |             |            |             |<SceneID>.I8 |
|       |             |            |             |<SceneID>.I9 |
|       |             |            |             |<SceneID>.WO |
|       |             |            |             |<SceneID>.HI |
|_______|_____________|____________|___________ _|_____________|
|1-5    |30           |BSQ         |<SceneID>.H1 |<SceneID>.I1 |
|9      |60           |            |<SceneID>.H2 |<SceneID>.I2 |
|       |             |            |             |<SceneID>.I3 |
|       |             |            |             |<SceneID>.I4 |
|       |             |            |             |<SceneID>.I5 |
|       |             |            |             |<SceneID>.I9 |
|       |             |            |             |<SceneID>.WO |
|       |             |            |             |<SceneID>.HI |
|_______|_____________|____________|_____________|_____________|
|1      |30           |BSQ         |<SceneID>.H1 |<SceneID>.I1 |
|8      |15           |            |<SceneID>.H2 |<SceneID>.I8 |
|       |             |            |             |<SceneID>.WO |
|       |             |            |             |<SceneID>.HI |
|_______|_____________|____________|_____________|_____________|
|1-5, 7 |30           |BSQ         |<SceneID>.H1 |<SceneID>.I1 |
|6, 9   |30           |            |             |<SceneID>.I2 |
|8      |30           |            |             |<SceneID>.I3 |
|       |             |            |             |<SceneID>.I4 |
|       |             |            |             |<SceneID>.I5 |
|       |             |            |             |<SceneID>.I6 |
|       |             |            |             |<SceneID>.I7 |
|       |             |            |             |<SceneID>.I8 |
|       |             |            |             |<SceneID>.I9 |
|       |             |            |             |<SceneID>.WO |
|       |             |            |             |<SceneID>.HI |
|_______|_____________|____________|_____________|_____________|


     The sequence of the image data files that are produced with 
     an NDF-format product are as follows:

     (ETM+ sample)

          LE7018033009924650.H1 -- Product header #1
          LE7018033009924650.H2 -- Product header #2
          LE7018033009924650.H3 -- Product header #3
          LE7018033009924650.I1 -- ETM+ band 1
          LE7018033009924650.I2 -- ETM+ band 2
          LE7018033009924650.I3 -- ETM+ band 3
          LE7018033009924650.I4 -- ETM+ band 4
          LE7018033009924650.I5 -- ETM+ band 5
          LE7018033009924650.I6 -- ETM+ band 6, low
          LE7018033009924650.I7 -- ETM+ band 7
          LE7018033009924650.I8 -- ETM+ band 8
          LE7018033009924650.I9 -- ETM+ band 6, high 
          LE7018033009924650.MTL - Level-1 metadata
          LE7018033009924650.WO -- Job report file
          LE7018033009924650.HI -- Job history file
          LE7018033009924650.DH -- DEM header (optional)
          LE7018033009924650.DD -- DEM data (optional)

     (TM sample)

          LT5018033009924650.H1 -- Product header #1
          LT5018033009924650.I1 -- TM band 1
          LT5018033009924650.I2 -- TM band 2
          LT5018033009924650.I3 -- TM band 3
          LT5018033009924650.I4 -- TM band 4
          LT5018033009924650.I5 -- TM band 5
          LT5018033009924650.I6 -- TM band 6
          LT5018033009924650.I7 -- TM band 7
          LT5018033009924650.WO -- Job report file
          LT5018033009924650.HI -- Job history file
          LT5018033009924650.DH -- DEM header (optional)
          LT5018033009924650.DD -- DEM data (optional)

     (MSS sample)

          LM5018033009924650.H1 -- Product header #1
          LM5018033009924650.I1 -- MSS band 1
          LM5018033009924650.I2 -- MSS band 2
          LM5018033009924650.I3 -- MSS band 3
          LM5018033009924650.I4 -- MSS band 4
          LM5018033009924650.I5 -- MSS band 5 (Landsat 3 only)
          LM5018033009924650.WO -- Job report file
          LM5018033009924650.HI -- Job history file
          LM5018033009924650.DH -- DEM header (optional)
          LM5018033009924650.DD -- DEM data (optional)


* README

The README.TXT (this document) is an ASCII text file.


* READING DATA    

Delivered on compact disc (CD) and digital versatile disc (DVD): 
Data files are not packed and conform to ISO 9660 Level-2 
standards.

Delivered via file transfer protocol (FTP):   Data files are 
not packed or compressed.

No software is included on this product for viewing Landsat 
data. 


GENERAL INFORMATION and DOCUMENTATION

Landsat 7 (ETM+):
http://landsat.usgs.gov/
http://eros.usgs.gov/products/satellite/landsat7.html

Landsat 4-5 (TM):
http://eros.usgs.gov/products/satellite/tm.html

Landsat 1-5 (MSS):
http://eros.usgs.gov/products/satellite/mss.html

FGDC metadata:
http://www.fgdc.gov/clearinghouse/clearinghouse.html

Data restrictions and citation:
http://eros.usgs.gov/about/customer/citation.html


PRODUCT SUPPORT
 
For further information on this product, contact USGS 
EROS Customer Services:

Customer Services (ATTN: Landsat)
U.S. Geological Survey
Earth Resources Observation and Science (EROS)
47914 252nd Street
Sioux Falls, SD 57198-0001

Tel: 800-252-4547
Tel: 605-594-6151 
TDD: 605-594-6933 
Fax: 605-594-6589 
Email: custserv@usgs.gov 
Web:  http://eros.usgs.gov/about/customer/index.html

For information on other products from USGS EROS:	
http://eros.usgs.gov/

For information on other USGS products:
http://ask.usgs.gov/  
or call 1-888-ASK-USGS (275-8747)


DISCLAIMER

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


Publication Date:  December 6, 2005
