These Landsat 7 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 7 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 …
[[["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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],[],[[["This Landsat 7 dataset provides 32-day Normalized Difference Snow Index (NDSI) composites from 1999 to 2017."],["The dataset is deprecated and users should switch to the Collection 1-based dataset: LANDSAT/LE07/C01/T1_32DAY_NDSI."],["NDSI values range from -1.0 to 1.0 and are calculated using the Green and Mid-IR bands to identify snow cover."],["Composites are created using all scenes within a 32-day period, prioritizing the most recent pixel."],["Landsat data is public domain, but users should acknowledge the USGS as the data source."]]],["This dataset contains Landsat 7 composites from 1999-01-01 to 2017-04-07, created from Level L1T orthorectified scenes, utilizing top-of-atmosphere reflectance. The composites are based on a 32-day period, using the most recent pixel value. The Normalized Difference Snow Index (NDSI) is calculated, and USGS is the data provider. Users are directed to switch to a Collection 1-based dataset, as USGS stopped producing this data in May 2017, and a newer dataset is available.\n"]]
