These Landsat 4 TM composites are made from Level L1T orthorectified scenes, using the
computed top-of-atmosphere (TOA) reflectance. See Chander et al.
(2009)
for details on the TOA computation.
As of May 1, 2017, the USGS is no longer producing Pre-Collection Landsat, and therefore this collection is complete. Please switch to a Collection 1-based dataset. See this documentation page for more information.
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 composites are made from Level L1T orthorectified scenes, using the computed top-of-atmosphere (TOA) reflectance. See Chander et al. (2009) for details on the TOA computation. As of May 1, 2017, the USGS is no longer producing Pre-Collection Landsat, and therefore this collection is complete. Please switch …
[[["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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],[],[[["This Landsat 4 TM dataset provides 32-day Normalized Difference Snow Index (NDSI) composites from 1982 to 1993."],["The dataset is considered deprecated and users should transition to the Collection 1-based dataset: LANDSAT/LT04/C01/T1_32DAY_NDSI."],["NDSI values, ranging from -1.0 to 1.0, are calculated using Green and Mid-IR bands to identify snow cover."],["The composites are created using Level L1T orthorectified scenes with top-of-atmosphere (TOA) reflectance."],["Landsat data is public domain, but users should acknowledge the USGS as the data source."]]],["This Landsat 4 TM dataset, provided by USGS and available from 1982 to 1993, is deprecated and users should switch to Collection 1-based datasets. It features 32-day composites of orthorectified scenes using top-of-atmosphere reflectance. The dataset uses the Normalized Difference Snow Index (NDSI), computed from Green and Mid-IR bands to identify snow with a range of -1.0 to 1.0, with a pixel size of 30 meters. Data is public domain, and usage must cite the USGS as the source.\n"]]
