These Landsat 4 TM Collection 1 Tier 1 composites are made from Tier 1 orthorectified scenes, using the
computed top-of-atmosphere (TOA) reflectance.
See Chander et al. (2009)
for details on the TOA computation.
The Normalized Difference Snow Index is used to
identify snow, based on its characteristically higher reflectance in
the visible portion of the spectrum compared to the mid-IR. NDSI is
computed using the Green and Mid-IR bands, and has a range of -1.0 to
1.0. See
Riggs et al. (1994)
for details.
These composites are created from
all the scenes in
each 32-day period beginning from the first day of the year and
continuing to the 352nd day of the year. The last composite of the
year, beginning on day 353, will overlap the first composite of the
following year by 20 days. All the images from each 32-day period are
included in the composite, with the most recent pixel as the composite value.
Bands
Bands
Name
Pixel Size
Description
NDSI
30 meters
Normalized Difference Snow Index
Terms of Use
Terms of Use
Landsat datasets are federally created data
and therefore reside in the public domain and may be used, transferred, or reproduced without copyright restriction.
Acknowledgement or credit of the USGS as data source should be provided
by including a line of text citation such as the example shown below.
(Product, Image, Photograph, or Dataset Name) courtesy of
the U.S. Geological Survey
Example: Landsat-7 image courtesy of the U.S. Geological Survey
These Landsat 4 TM Collection 1 Tier 1 composites are made from Tier 1 orthorectified scenes, using the computed top-of-atmosphere (TOA) reflectance. See Chander et al. (2009) for details on the TOA computation. The Normalized Difference Snow Index is used to identify snow, based on its characteristically higher reflectance in …
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],[],[[["This dataset provides Landsat 4 TM Collection 1 Tier 1 composites, created from orthorectified scenes using top-of-atmosphere (TOA) reflectance."],["It utilizes the Normalized Difference Snow Index (NDSI) to identify snow cover, calculated using Green and Mid-IR bands."],["The dataset covers a period from August 13, 1982, to November 17, 1993, with 32-day composites."],["Images are provided by the U.S. Geological Survey (USGS) and reside in the public domain."],["Access and analysis of the dataset can be done through Google Earth Engine."]]],["The Landsat 4 TM dataset, available from 1982-08-13 to 1993-11-17, provides 32-day composites of the Normalized Difference Snow Index (NDSI), derived from Tier 1 orthorectified scenes' top-of-atmosphere reflectance. Each composite includes all images from a 32-day period with the most recent pixel value. The NDSI, ranging from -1.0 to 1.0, uses green and mid-IR bands to identify snow. This dataset is in the public domain, provided by USGS, and accessible through Google Earth Engine.\n"]]
