U.S. Geological Survey
             LEVEL-1 PRODUCT README: GeoTIFF

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 Geographic Tagged 
Image-File Format (GeoTIFF).  The Landsat 1, 2, and 3 
satellites carried the multispectral scanner (MSS) sensors; the 
Landsat 4 and 5 satellites carries 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.  Information on the Landsat 1 through 5 
satellites is available at the Web sites:
http://edc.usgs.gov/Webglis/glisbin/guide.pl/glis/hyper/guide/landsat
http://edc.usgs.gov/Webglis/glisbin/guide.pl/glis/hyper/guide/landsat_tm

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 Level-0 and 
Level-1 Data Sets Document".  The GeoTIFF files for Landsat-7 
data are described in detail in the "Level 1 Product Output 
File, Data Format Control Book, L7-DFCB-04, Vol. 5, Book 2, 
Revision 5, April 2001".  Other documents may be found on the 
Landsat-7 Documents Web page.

Landsat-7 Level-0 and Level-1 Data Sets Document:
http://eosims.cr.usgs.gov:5725/DATASET_DOCS/landsat7_dataset.html

Level 1 Product Output File, Data Format Control Book, 
L7-DFCB-04, Vol. 5, Book2, Revision 5, April 2001:
http://landsat7.usgs.gov/documents/dfcb/L1-409_DFCB_V5_B2_R5.pdf

Landsat-7 Documents page:
http://edcwww.cr.usgs.gov/l7dhf/L7MMO/document.htm

The "National Land Archive Production System (NLAPS) Systematic 
Format Description Document" provides an overview of multiple 
product formats including GeoTIFF format for Landsats 4, 5 and 
7.
http://edc.usgs.gov/products/satellite/NLAPSII.pdf


FORMAT

Landsat data are provided in GeoTIFF for radiometrically and 
geometrically corrected (level-1G) products.  GeoTIFF defines a 
set of publicly available TIFF tags that describe cartographic 
and geodetic information associated with TIFF images.  GeoTIFF 
is a format that enables referencing a raster image to a known 
geodetic model or map projection.  The initial tags are 
followed by image data, that in turn, may be interrupted by 
more descriptive tags.  By using the GeoTIFF format, both 
metadata and image data can be encoded into the same file.

For more information on GeoTIFF visit:
http://www.remotesensing.org/geotiff/geotiff.html


ORGANIZATION
 
Each band of Landsat data in the GeoTIFF format is delivered as 
a grayscale, uncompressed, 8-bit string of unsigned integers.  
A metadata file (MTL) is included with Landsat-7 GeoTIFF 
orders.  No other files accompany the product.

* DATA FILE NAMES

The file naming convention for Landsat-7 GeoTIFF is as follows:

L7fppprrr_rrrYYYYMMDD_AAA.TIF  where:
     L7          = Landsat-7 mission
     f           = ETM+ data format (1 or 2)
     ppp         = starting path of the product
     rrr_rrr     = starting and ending rows of the product
     YYYYMMDD    = acquisition date of the image
     AAA         = 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
          MTL         = Level-1 metadata
     TIF         = GeoTIFF file extension

The file naming convention for other Landsat GeoTIFF is as 
follows:

LTNppprrrOOYYDOY10_AA.TIF  where:
     LT          = Landsat thematic mapper
     N           = satellite number.  This should be 
                   validated against the satellite field 
                   if used exclusively
     ppp         = starting path of the product
     rrr         = starting row of the product
     OO          = WRS row offset (set to 00)
     YY          = last two digits of the year of 
                   acquisition
     DOY         = Julian date of acquisition
     1           = instrument mode
     0           = instrument multiplexor (MUX)	
     AA          = file type:
          B1          = band 1
          B2          = band 2
          B3          = band 3
          B4          = band 4
          B5          = band 5
          B6          = band 6
          B7          = band 7 
     TIF         = GeoTIFF file extension

* README

The README.GTF is a text file and is this document.

* READING DATA    

Delivered on tape:  Data on 8-mm, high-density (Exabyte) tape 
and on digital linear tape (DLT) are tarred per Institute of 
Electrical and Electronics Engineers (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  = data are to be read from tape
                 v  = requests verbose output (that is, 
                      processed file names will be listed)
                 f  = 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 server or workstation 
     configurations.

     An example of extracting a specific directory from a 
     tar-formatted tape:

                 tar -xvf /<device name> 1

     Other operating systems may require additional software for 
     reading tar-formatted media.

Delivered on compact disc (CD):  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.


GENERAL INFORMATION and DOCUMENTATION

For information about Landsat data sets, including 
tutorials, product standards, and software, see:

For Landsat-7
http://landsat7.usgs.gov/
http://edcdaac.usgs.gov/

For Landsat (1-5)
http://edc.usgs.gov/products/satellite/mss.html
http://edc.usgs.gov/products/satellite/tm.html

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

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


ORDER SUPPORT

Direct questions about orders to the USGS EROS Data 
Center's Customer Services at 1-800-252-4547 or contact 
an Earth Science Information Center (ESIC) office.

USGS EROS Data Center:  
http://edc.usgs.gov/

Customer Services: 
http://edc.usgs.gov/about/customer/index.html

ESIC Office Listing:
http://mapping.usgs.gov/esic/esic_index.html

For information about other USGS products, see:
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:  April 29, 2002