EROS Data Center, U.S. Geological Survey, Sioux Falls, SD  57198
Customer Services phone: 605-594-6151 (7:30 a.m. to 4:00 p.m. CT) 
Earthshots: metadata file for the San Antonio NALC triplicate
13 December 1996

File names:

   SanAnMetadataREADME
   10Aug761SanAn666x666MSS
   10Aug762SanAn666x666MSS
   10Aug764SanAn666x666MSS
   16Jun911SanAn666x666MSS
   16Jun912SanAn666x666MSS
   16Jun914SanAn666x666MSS
   2Aug851SanAn666x666MSS
   2Aug852SanAn666x666MSS
   2Aug854SanAn666x666MSS

These files are cut-down versions of a NALC triplicate-- Landsat images of San Antonio, Texas from three dates: 10 August 1976, 2 August 1985, and 16
June 1991.  NALC is the North American Landscape Characterization project, a component of the National Aeronautics and Space Administration (NASA)
Landsat Pathfinder Program.  At http://edcwww.cr.usgs.gov/landdaac/pathfinder/pathpage.html you can find a NALC User's Guide, and a sample set of
NALC data (a site other than San Antonio) which you can download.

These San Antonio images are all 666 by 666 pixels (666 wide and 666 tall).  They are made from Landsat MSS (Multispectral Scanner) data, which was
corrected and georegistered (straightened out to read like a map, with north pointing up), and resampled to 60 meters.  So each pixel represents a
square of ground 60 m by 60 m.  MSS bands 1, 2 and 4 (earlier known as bands 4, 5 and 7) are provided here.  

   MSS bands (wavelengths):
   MSS band 1 (green)         0.5 - 0.6 micrometers
   MSS band 2 (red)           0.6 - 0.7 micrometers
   MSS band 4 (near-infrared) 0.8 - 1.1 micrometers

Following is information on the original scenes.  Note: Landsats 1, 2 and 3 were on a different path/row system from Landsats 4 and 5; these scenes
are all exactly the same place.

   scene LM1029040007622390 (10 August 1976, path 29, row 40, Landsat 1 MSS)
   scene LM5027040008521490 (2 August 1980, path 27, row 40, Landsat 5 MSS)
   scene LM5027040009116790 (16 June 1991, path 27, row 40, Landsat 5 MSS)