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
8-day period beginning from the first day of the year and continuing
to the 360th day of the year. The last composite of the year,
beginning on day 361, will overlap the first composite of the
following year by 3 days. All the images from each 8-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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],[],[[["The dataset provides Landsat 4 TM Collection 1 Tier 1 8-Day NDSI Composite images, available from August 21, 1982, to December 11, 1993."],["It utilizes the Normalized Difference Snow Index (NDSI) to identify snow cover based on reflectance differences."],["Composites are created from all scenes within each 8-day period, prioritizing the most recent pixel for the composite value."],["The dataset includes one band, \"NDSI\", with a pixel size of 30 meters, representing the Normalized Difference Snow Index."],["Landsat datasets are in the public domain and can be used freely with proper USGS acknowledgement."]]],["The Landsat 4 TM dataset, available from 1982-08-21 to 1993-12-11, provides 8-day Normalized Difference Snow Index (NDSI) composites. These composites, derived from Tier 1 orthorectified scenes, use top-of-atmosphere reflectance. NDSI, calculated with Green and Mid-IR bands (30-meter pixel size), identifies snow. Composites are built from all scenes within each 8-day period, with the most recent pixel as the composite value. The dataset, provided by Google via Earth Engine, is in the public domain and requires USGS acknowledgment.\n"]]
