SMEX04 Landsat Thematic Mapper Imagery: Arizona and Sonora

Summary

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 for 11 June 2004, 29 July 2004, and 30 August 2004. The images are the result of combining TM bands 2, 3, and 4 as blue, green, and red respectively to generate false color composites. Data are provided in Georeferenced Tagged Image File Format (GeoTIFF) files and are available via FTP.

These data were collected as part of a validation study for the Advanced Microwave Scanning Radiometer - Earth Observing System (AMSR-E). AMSR-E is a mission instrument launched aboard NASA's Aqua Satellite on 04 May 2002. AMSR-E validation studies linked to SMEX are designed to evaluate the accuracy of AMSR-E soil moisture data. Specific validation objectives include assessing and refining soil moisture algorithm performance; verifying soil moisture estimation accuracy; investigating the effects of vegetation, surface temperature, topography, and soil texture on soil moisture accuracy; and determining the regions that are useful for AMSR-E soil moisture measurements.

Citing These Data

We kindly request that you cite the use of this data set in a publication using the following citation. For more information, see our Use and Copyright Web page.

Jackson, T. and M. Cosh. 2008. SMEX04 Landsat Thematic Mapper Imagery: Arizona and Sonora. [indicate subset used]. Boulder, Colorado USA: NASA DAAC at the National Snow and Ice Data Center.

Overview Table

Category Description
Data format GeoTIFF imagery (.tif) and TIFF world files (.tfw)
Spatial coverage and resolution Southernmost Latitude: 29.33 ° N
Northernmost Latitude: 32.69 ° N
Westernmost Longitude: 111.40 ° W
Easternmost Longitude: 108.56 ° W

High-resolution 30 m data
Temporal coverage and resolution 11 June 2004, 29 July 2004, and 30 August 2004
Tools for accessing data A program which recognizes the GeoTIFF file format is recommended for these images.
File naming convention TM5_MMDDYY.tif and TM5_MMDDYY.tfw
File size 1 KB to 95 MB
Parameter(s) Infrared Imagery
Visible Imagery
Procedures for obtaining data Data are available via FTP.

Table of Contents

  1. Contacts and Acknowledgments
  2. Detailed Data Description
  3. Data Access and Tools
  4. Data Acquisition and Processing
  5. References and Related Publications
  6. Document Information

1. Contacts and Acknowledgments

Investigator(s)

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

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

Technical Contact

NSIDC User Services
National Snow and Ice Data Center
CIRES, 449 UCB
University of Colorado
Boulder, CO 80309-0449  USA
phone: +1 303.492.6199
fax: +1 303.492.2468
form: Contact NSIDC User Services
e-mail: nsidc@nsidc.org

Acknowledgements

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.

2. Detailed Data Description

For this study, TM bands 2, 3, and 4 were combined to make false color composites.

Format

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

File Naming Convention

Files are named according to the following convention:

TM5_MMDDYY.tif and TM5_MMDDYY.tfw

Where:

MM=month
DD=day
YY=year

Example File Names: TM5_061104.tif and TM5_061104.tfw

File Size

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

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

Universal Transverse Mercator (UTM) Zone 12.

Temporal Coverage

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

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
5
35 / 38 for Arizona
35 / 39 for Sonora
TM5_072904.tif 29 July 2004
5
35 / 38 for Arizona
35 / 39 for Sonora
TM5_083004.tif 30 August 2004
5
35 / 38 for Arizona
35 / 39 for Sonora

Sample Data Record

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

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

3. Data Access and Tools

Data Access

Images are available via FTP.

Volume

Total volume is approximately 286 MB.

Software and Tools

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

Related Data Collections

4. 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.

5. References and Related Publications

U.S. Geological Survey (USGS). Landsat Missions. 1 May 2008. http://landsat.usgs.gov/ 1 May 2008.

Sheffner, Ed. Landsat Program. 5 October 1991. http://geo.arc.nasa.gov/sge/landsat/landsat.html 1 May 2008.

Please see the USDA SMEX04 Web site for in depth information on the science mission and goal of the SMEX project.

6. Document Information

Acronyms

The following acronyms are used in this document.

Table 3. Acronyms
AMSR Advanced Microwave Scanning Radiometer
AMSR-E Advanced Microwave Scanning Radiometer - Earth Observing System
ARS Agricultural Research Service
FTP File Transfer Protocol
GeoTIFF Georeferenced Tag(ged) Image File Format
NASA National Aeronautics and Space Administration
NSIDC National Snow and Ice Data Center
SMEX Soil Moisture Experiment
SWRC Southwest Watershed Research Center
TFW TIFF World Files
TIFF Tag(ged) Image File Format
TM Thematic Mapper
URL Uniform Resource Locator
USDA United States Department of Agriculture
USGS United States Geological Survey
UTM Universal Transverse Mercator

Document Creation Date

1 May 2008

Document Revision Date

N/A

Document URL

http://nsidc.org/data/docs/daac/nsidc0341_smex04_tm_geotiff.gd.html