Landsat 7 Collection 1 Tier 1 Landsat 7 Collection 1 Tier 1 Annual Greenest-Pixel TOA Reflectance Composite

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LANDSAT/LE07/C01/T1_ANNUAL_GREENEST_TOA
Dataset Availability
1999-01-01T00:00:00Z–2021-01-01T00:00:00
Dataset Provider
Earth Engine Snippet
ee.ImageCollection("LANDSAT/LE07/C01/T1_ANNUAL_GREENEST_TOA")
Tags
annual greenest landsat toa usgs

Description

Landsat 7 Collection 1 Tier 1 calibrated top-of-atmosphere (TOA) reflectance. Calibration coefficients are extracted from the image metadata. See Chander et al. (2009) for details on the TOA computation.

Note that Landsat 7's orbit has been drifting to an earlier acquisition time since 2017.

These composites are created from all the scenes in each annual period beginning from the first day of the year and continuing to the last day of the year. All the images from each year are included in the composite, with the greenest pixel as the composite value, where the greenest pixel means the pixel with the highest value of the Normalized Difference Vegetation Index (NDVI).

Bands

Bands

Name Pixel Size Wavelength Description
B1 30 meters 0.45 - 0.52 μm

Blue

B2 30 meters 0.52 - 0.60 μm

Green

B3 30 meters 0.63 - 0.69 μm

Red

B4 30 meters 0.77 - 0.90 μm

Near infrared

B5 30 meters 1.55 - 1.75 μm

Shortwave infrared 1

B6_VCID_1 60 meters 10.40 - 12.50 μm

Low-gain Thermal Infrared 1. This band has expanded dynamic range and lower radiometric resolution (sensitivity), with less saturation at high Digital Number (DN) values. Resampled from 60m to 30m.

B6_VCID_2 60 meters 10.40 - 12.50 μm

High-gain Thermal Infrared 1. This band has higher radiometric resolution (sensitivity), although it has a more restricted dynamic range. Resampled from 60m to 30m.

B7 30 meters 2.08 - 2.35 μm

Shortwave infrared 2

B8 15 meters 0.52 - 0.90 μm

Panchromatic

BQA 30 meters

Landsat Collection 1 QA Bitmask (See Landsat QA page)

greenness 30 meters

The pixel with the highest value of the Normalized Difference Vegetation Index (NDVI) for the year covered by the image.

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

See the USGS Visual Identity System Guidance for further details on proper citation and acknowledgement of USGS products.

Explore in Earth Engine

// Import the dataset, filter to 2002, get the image.
var dataset = ee.ImageCollection('LANDSAT/LE07/C01/T1_ANNUAL_GREENEST_TOA')
                  .filterDate('2002-01-01', '2002-12-31')
                  .first();

// Get the greenness band.
var greenness = dataset.select('greenness');

// Get bands for true color RGB display.
var trueColor = dataset.select(['B3', 'B2', 'B1']);

// Define a mask for low greenness, make low greenness partially transparent.
var mask = dataset.select('greenness').gt(0.1).remap([0, 1], [0.5, 1]);

// Visualization parameters for greenness display.
var greennessVis = {
  min: 0.1,
  max: 0.85,
  palette: ['fffdcd', 'e1cd73', 'aaac20', '5f920c', '187328', '144b2a', '172313']
};

// Visualization parameters for true color display.
var trueColorVis = {
  min: 0.0,
  max: 0.4,
  gamma: 1.2,
};

// Display the layers on the map with mask applied.
Map.setCenter(43.4, 40.0, 7);
Map.addLayer(trueColor.updateMask(mask), trueColorVis, 'True Color (432)', false);
Map.addLayer(greenness.updateMask(mask), greennessVis, 'Greenness');