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Data Set ID:
NSIDC-0331

SMEX03 Landsat Thematic Mapper Imagery: Alabama, Version 1

This data set provides imagery developed from Landsat 5 Thematic Mapper (TM) and Landsat 7 Enhanced Thematic Mapper (ETM+) data for use in studying land cover features during the Soil Moisture Experiment 2003 (SMEX03).

Geographic Coverage

Parameter(s):
  • Infrared Wavelengths > Infrared Imagery
  • Visible Wavelengths > Visible Imagery
Spatial Coverage:
  • N: 35.2, S: 34.6, E: -85.7, W: -87.1

Spatial Resolution: Not Specified
Temporal Coverage:
  • 23 June 2003
  • 7 July 2002
Temporal Resolution: Not specified
Data Format(s):
  • GeoTIFF
Platform(s) LANDSAT-5, LANDSAT-7
Sensor(s): ETM+, TM
Version: V1
Data Contributor(s): Thomas Jackson, Michael Cosh
Data Citation

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. 2007. SMEX03 Landsat Thematic Mapper Imagery: Alabama, Version 1. [Indicate subset used]. Boulder, Colorado USA. NASA National Snow and Ice Data Center Distributed Active Archive Center. doi: http://dx.doi.org/10.5067/QL4HIMU3TQ3U. [Date Accessed].

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Detailed Data Description

This data set provides imagery developed from Landsat 5 Thematic Mapper (TM) and Landsat 7 Enhanced Thematic Mapper (ETM+) data for use in studying land cover features during the Soil Moisture Experiment 2003 (SMEX03).

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

  • Vegetation appear as shades of red. Brighter reds indicate thicker vegetation.
  • Soils with little or no vegetation appear as shades from white (sands) to green or brown, depending on moisture and vegetation content.
  • Water appears blue.
  • Urban areas appear as blue-gray.
  • Clouds and snow appear bright white.
Format

Data are provided as GeoTIFF image files. GeoTIFF defines a set of publicly available TIFF tags that describe cartographic and geodetic information associated with TIFF images. GeoTIFF 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.

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File Naming Convention

Files are named according to the following convention:

AL_SMEX03_MMDDYY_RR_PP.tif

Where

MM = month
DD = day
YY = year
RR = row
PP = path

Example File Names: AL_SMEX03_062303_21_36.tif and AL_SMEX03_Mosaicked.tif

AL_SMEX03_Mosaicked.tif is a mosaicked scene of AL_SMEX03_070702_20_36.tif and AL_SMEX03_062303_21_36.tif.

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File Size

File sizes are approximately 16 MB to 22 MB each for the .tif files.

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Volume

Total volume is approximately 60 MB.

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Spatial Coverage

Southernmost Latitude: 34.6° N
Northernmost Latitude: 35.2° N
Westernmost Longitude: 87.1° W
Easternmost Longitude: 85.7° W

Spatial Resolution

The Landsat TM and ETM+ data are high-resolution 30 m data.

Projection

Universal Transverse Mercator (UTM) Zone 15.

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Temporal Coverage

7 July 2002 and 23 June 2003

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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 are used to generate false color images that can be used to identify land cover and vegetation.

Parameter Source

TM scenes from Landsat 5 and ETM+ scenes from Landsat 7 were acquired during the study period. The following table details the Landsat coverage for the dates of the study.

Table 1: Landsat Coverage Details
File Name Date Landsat
Number
Path / Row
AL_SMEX03_070702_20_36.tif 7 July 2002
7
20 / 36
AL_SMEX03_062303_21_36.tif 23 June 2003
5
21 / 36
AL_SMEX03_Mosaicked.tif 7 July 2002 and 23 June 2003
5 and 7
20 / 36 and 21 / 36

Sample Data Record

False Color Image of the Huntsville Area
Figure 1: False Color Image of the Huntsville Area, Sample from Image File AL_SMEX03_070702_20_36.tif.

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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

Data Acquisition Methods
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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.

ETM+, an improved version of TM, is carried on Landsat 7. The ETM+ has eight 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
USA

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

Acknowledgments: 

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 2003 Science Team, the NASA Marshall Space Flight Center, and the Alabama A&M University 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

DOCUMENT CREATION DATE

26 November 2007

DOCUMENT REVISION DATE

1 May 2008 - Updated new USGS Landsat web page

No technical references available for this data set.
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