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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 consist of Level 1G imagery products (radiance) that have been radiometrically and geometrically corrected.
Landsat Processes Distributed Active Archive Center. 2003. CLPX-Satellite: Landsat Thematic Mapper Imagery. [indicate subset used]. Compiled by R. Davis. Boulder, Colorado USA: NASA National Snow and Ice Data Center Distributed Active Archive Center. doi: 10.5067/HUPUO3FCF965.
|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||Data are available via FTP and HTTPS|
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Land Processes DAAC User Services
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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) .
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.).
Data are available on the FTP site in the ftp://sidads.colorado.edu/pub/DATASETS/nsidc0149_clpx_sat_landsat/ directory. Within this directory, there are 25 folders: 17 for Landsat-7 files and 8 for Landsat-5 files. The Landsat-7 folders' names begin with LE, i.e. LE70340320001203, and Landsat-5 folders' names begin with LT, i.e. LT50350320002061.
This section explains the file naming convention used for this product with two examples: one for Landsat-7 and one for Landsat-5.
Example File Names: L7fppprrr_rrrYYYYMMDD_AAA.TIF
Refer to Table 1 for the valid values for the Landsat-7 file name variables and Table 2 for Landsat-5 file name variables listed above.
|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|
|B61||band 6L (low gain)|
|B62||band 6H (high gain)|
|TIF||GeoTIFF file extension|
|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|
|0||instrument multiplexor (MUX)|
|TIF||GeoTIFF file extension|
Each folder has an ASCII readme file, named README.GTF, and an ASCII metadata file named *filename*_MTL.txt.
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.
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.
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.
Images were collected between 22 July 2001 and 22 March 2003. 25 scenes were collected during cloud sparse periods, fall through winter and spring.
|ETM+ (7)||034/032||2001 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|
This data set presents Level 1G (radiance) radiometrically and geometrically corrected Landsat TM imagery.
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.
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:
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
9 September 2003