Data Set ID:

SMEX04 Landsat Thematic Mapper Imagery, Sonora, Version 1

This data set provides imagery developed from Landsat 5 Thematic Mapper (TM) data for use in studying land cover features during the Soil Moisture Experiment 2004 (SMEX04). Three false color images are provided for the regional study areas in Arizona, USA and Sonora, Mexico.

This is the most recent version of these data.

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Data Format(s):
  • GeoTIFF
Spatial Coverage:
N: 32.69, 
S: 29.33, 
E: -108.56, 
W: -111.4
Spatial Resolution:Not SpecifiedSensor(s):TM
Temporal Coverage:
  • 11 June 2004
  • 29 July 2004
  • 30 August 2004
Temporal ResolutionNot specifiedMetadata XML:View Metadata Record
Data Contributor(s):Thomas Jackson, Michael Cosh

Geographic Coverage

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As a condition of using these data, you must cite the use of this data set using the following citation. For more information, see our Use and Copyright Web page.

Jackson, T. and M. Cosh. 2013. SMEX04 Landsat Thematic Mapper Imagery, Sonora, Version 1. [Indicate subset used]. Boulder, Colorado USA. NASA National Snow and Ice Data Center Distributed Active Archive Center. doi: [Date Accessed].

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Detailed Data Description


Data are provided as GeoTIFF image files with associated TIFF world files (TFW) containing georeferencing information. GeoTIFF defines a set of publicly available TIFF tags that describe cartographic and geodetic information associated with TIFF images. GeoTIFF enables the referencing of a raster image to a known geodetic model or map projection. By using the GeoTIFF format, both metadata and image data can be encoded into the same file.

TFW files provide georeference information for the image with the same file name. Each TFW file is a text file with six numbers, described below:

Table 1. TFW File Rows
Row Description
1 the dimension of a pixel in map units in the x direction
2 rotation term for row
3 rotation term for column
4 the dimension of a pixel in map units in the y direction
5 x coordinate for upper left corner
6 y coordinate for upper left corner
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File Naming Convention

Files are named according to the following convention:


Example File Names: TM5_061104.tifandTM5_061104.tfw


MM = month
DD = day
YY = year
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File Size

File sizes are approximately 1 KB each for the .tfw files and 95 MB each for the .tif files.

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Total volume is approximately 286 MB.

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Spatial Coverage

Southernmost Latitude: 29.33 ° N
Northernmost Latitude: 32.69 ° N
Westernmost Longitude: 111.40 ° W
Easternmost Longitude: 108.56 ° W

Spatial Resolution

The Landsat TM data are high-resolution 30 m data.

Projection and Grid Description

Universal Transverse Mercator (UTM) Zone 12.

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Temporal Coverage

11 June 2004, 29 July 2004, and 30 August 2004

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Parameter or Variable

Infrared Imagery (Band 4)
Visible Imagery (Bands 2 and 3)

Parameter Description

Bands 2, 3, and 4 as blue, green, and red respectively are used to generate false color images that can be used to identify land cover and vegetation.

Parameter Source

TM scenes from Landsat 5 were acquired during the study period. Table 2 details the Landsat coverage for the dates of the study.

Table 2. Landsat Coverage Details
File Name Date Landsat Number Path / Row
TM5_061104.tif 11 June 2004


35 / 38 for Arizona
35 / 39 for Sonora

TM5_072904.tif 29 July 2004


35 / 38 for Arizona
35 / 39 for Sonora

TM5_083004.tif 30 August 2004


35 / 38 for Arizona
35 / 39 for Sonora

Sample Data Record

Figure 1 is a false color sample image of the Arizona area, File Number: TM5_061104.tif.

Three Color False Image of the Arizona Area, Sample from Image File TM5_061104.tif.
Figure 1. False Color Sample Image of the Arizona Area

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Software and Tools

Software and Tools

A program which recognizes the GeoTIFF file format is recommended for these images.

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Data Acquisition and Processing

Sensor or Instrument Description

TM is a multispectral scanning radiometer carried on Landsats 4 and 5. The TM has seven spectral bands, with a spatial resolution of 30 m for most bands.

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References and Related Publications

Contacts and Acknowledgments

Thomas J. Jackson
USDA ARS Hydrology and Remote Sensing Lab
Beltsville, MD 20705

Michael H. Cosh
USDA ARS Hydrology and Remote Sensing Lab
Beltsville, MD 20705


The investigators would like to acknowledge the following people: The many graduate students and volunteers who worked to collect the field data. The Soil Moisture Experiment 2004 Science Team, the Southwest Watershed Research Center (SWRC) with the USDA Agricultural Research Service (USDA-ARS) for their assistance. The National Aeronautics and Space Administration for their generous contributions to the study. This work was supported by the NASA Aqua AMSR, Terrestrial Hydrology and Global Water Cycle Programs.

Document Information


1 May 2008



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