CLPX-Satellite: Landsat Thematic Mapper Imagery

Summary

This data set consists of Landsat thematic mapper imagery collected over the Cold Land Processes Field Experiment (CLPX) Large Regional Study Area (LRSA), located between 38.5-42 N and 104-108.5 W. Data were collected between 22 July 2001 and 22 March 2003, using the Enhanced Thematic Mapper Plus sensor (ETM+) on Landsat 7 and the Thematic Mapper (TM) sensor on Landsat 5. Data consist of Level 1G imagery products (radiance) that have been radiometrically and geometrically corrected. Each band of Landsat data in the GeoTIFF format is delivered as a greyscale, uncompressed, 8-bit string of unsigned integers. This data set is part of the NASA CLPX.

The NASA CLPX is a multi-sensor, multi-scale experiment that focuses on extending a local-scale understanding of water fluxes, storage, and transformations to regional and global scales. Within a framework of nested study areas in the central Rocky Mountains of the western United States, ranging from 1-ha to 160,000 km2, intensive ground, airborne, and spaceborne observations are collected. Data collection focuses on two seasons: mid-winter, when conditions are generally frozen and dry, and early spring, a transitional period when both frozen and thawed, dry and wet conditions are widespread.

Citing These Data

Landsat Processes Distributed Active Archive Center. 2003. CLPX-Satellite: Landsat Thematic Mapper Imagery. [indicate subset used]. Compiled by R. Davis. Boulder, Colorado USA: NASA DAAC at the National Snow and Ice Data Center.

Overview Table

Category Description
Data format GeoTIFF images and ASCII text
Spatial coverage and resolution 39.35 - 41.31 N, 104.52- 107.24 W
Temporal coverage and resolution 22 July 2001 to 22 March 2003
File size Files range from 14 to 219 MB
Parameter(s) Level 1 (radiance) radiometrically and geometrically corrected Landsat TM imagery, consisting of seven spectral bands, spanning 0.45-2.35 microns.
Procedures for obtaining data CLPX Landsat order form

Table of Contents

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

1. Contacts and Acknowledgements

Investigator(s) Name and Title

DAAC User Services
Land Processes DAAC User Services
EROS Data Center
Mundt Federal Building
Sioux Falls, SD 57198
Telephone: 605-594-6116
Facsimile: 605-594-6963
Email:edc@eos.nasa.gov

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

These data are published by the Land Processes Distributed Active Archive Center (LP DAAC), located at the U.S. Geological Survey's EROS Data Center (http://LPDAAC.usgs.gov) .

2. Detailed Data Description

Format

Image files are in Geographic Tagged Image-File Format (GeoTIFF). 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.

The GeoTIFF images in this data set are delivered as a greyscale, uncompressed, 8-bit string of unsigned integers. Each Landsat 7 ETM+ and Landsat 5 TM scene has a Level 1 Product "Readme" file (in ASCII) containing generic information that describes the format, organization, general information and documentation of Landsat data. In addition Landsat 7 ETM+ data has an accompanying metadata file consisting of an ASCII header containing image parameters (e.g., map projection, horizontal datum, resampling methods, pixel format, etc.).

File Naming Convention

The file naming convention for Landsat-7 GeoTIFF files 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 Landsat-5 GeoTIFF files 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

Each directory has an ASCII readme file, named README.GTF, and an ASCII metadata file named *filename*_MTL.txt.

File Size

GeoTIFF image files range in size from 14 to 219 MB. The ASCII Readme files are approximately 8 KB, and the ASCII metadata files are approximately 7 KB.

Spatial Coverage

Images were taken over the CLPX LRSA, located at 39.35 - 41.31 N, 104.52 - 107.24 W. Two scenes from the Landsat orbital cycle are required to cover all three MSAs within the LRSA.

Coverage of the LRSA required scenes described by Path/Row specifications 34/32, covering Fraser and North Park Meso-cell Study Areas (MSA), and 35/32, which covers the Rabbit Ears MSA and the western part of the North Park MSA. Scenes have an approximate size of about 170 x 183 km (106 x 115 mi). The spatial accuracy is typically within 250 m.

Spectral Resolution

Image data from both sensors consists of seven spectral bands, spanning 0.45-2.35 microns with a spatial resolution of 30 m for bands 1-5, and 7. Band 6, the thermal infrared, measures between 10.4-12.5 microns and has a spatial resolution of 60 m using the ETM+ sensor and 120 m using the TM sensor.

Temporal Coverage

Images were collected between 22 July 2001 and 22 March 2003. 25 scenes were collected during cloud sparse periods, fall through winter and spring.

Sensor
(Landsat satellite
number)
Starting Path/Row
of product
Acquisition date
of image
ETM+ (7)034/0322001 07 22
ETM+ (7) 034/032 2001 08 07
ETM+ (7) 034/032 2001 09 24
ETM+ (7) 035/032 2001 11 02
ETM+ (7) 034/032 2002 02 15
ETM+ (7) 034/032 2002 03 03
ETM+ (7) 035/032 2002 03 10
ETM+ (7) 034/032 2002 03 19
ETM+ (7) 034/032 2002 04 04
ETM+ (7) 034/032 2002 05 06
ETM+ (7) 035/032 2002 05 13
ETM+ (7) 034/032 2002 08 10
ETM+ (7) 034/032 2002 10 13
ETM+ (7) 034/032 2002 11 30
ETM+ (7) 035/032 2003 01 08
ETM+ (7) 035/032 2003 03 13
ETM+ (7) 034/032 2003 03 22
TM (5) 035/032 2001 11 10
TM (5) 034/032 2001 11 19
TM (5) 034/032 2002 02 07
TM (5) 035/032 2002 03 02
TM (5) 034/032 2002 08 18
TM (5) 034/032 2002 10 21
TM (5) 034/032 2002 11 06
TM (5) 034/032 2003 01 09

Parameter or Variable

This data set presents Level 1G (radiance) radiometrically and geometrically corrected Landsat TM imagery.

3. Data Access

Data Access

Data can be ordered by path and date using the CLPX Landsat order form.

Related Data Collections

All CLPX Data Sets

4. Data Acquisition

Image data from both sensors consists of seven spectral bands, spanning 0.45-2.35 microns with a spatial resolution of 30 meters for bands 1-5, and 7. Band 6, the thermal infrared, measures between 10.4-12.5 microns and has a spatial resolution of 60 meters using the ETM+ sensor and 120 meters using the TM sensor. The ETM+ sensor on Landsat 7 separates band 6 into a low gain product (6L) and a high gain product (6H). The TM sensor on Landsat 5 only produces a single band 6 output. In addition to bands 1-7 the ETM+ also carries a panchromatic band that is visible through the near infra-red at a 15 m resolution. The panchromatic band is used to 'sharpen' multispectral images.

5. References and Related Publications

Additional information and documentation on the Landsat project, satellites, instruments, and data is available at the USGS Landsat Project site.

Information on the Landsat 1 through 5 satellites is available at thte USGS Landsat Thematic Mapper Data (TM) site.

Information on the Landsat-7 Program, including information about the Landsat-7 satellite, the ETM+ sensor, and Landsat-7 data collection, is available from USGS EROS on the Enhanced Thematic Mapper Plus (ETM+) documentation pages.

For information about Landsat data sets, including tutorials, product standards, and software, visit the following sites:

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

6. Document Information

List of Acronyms

CLPX = NASA Cold Land Processes Field Experiment
EROS = Center for Earth Resources Observation and Science
IOP = Intensive Observation Period
ISA = Intensive Study Area
LRSA = Large Regional Study Area
LSOS = Local Scale Observation Site
MSA = Meso-cell Study Area
USGS = United States Geological Survey

Document Creation Date

9 September 2003

Document URL

http://nsidc.org/data/nsidc-0149.html