Landsat 4 TM Collection 1 Tier 1 Annual TOA Reflectance Composite

AI-generated Key Takeaways

• The Landsat 4 TM Collection 1 Tier 1 dataset provides annual composites of top-of-atmosphere (TOA) reflectance from 1982 to 1993.

• These composites are created using orthorectified scenes, with the most recent pixel representing the composite value for each year.

• The dataset includes spectral bands ranging from blue to thermal infrared, with a spatial resolution of 30 meters.

• Landsat datasets are in the public domain and can be used freely with proper USGS acknowledgment.

• Google Earth Engine provides access to this dataset for research, education, and non-profit use.

Dataset Availability

1982-01-01T00:00:00Z–1993-01-01T00:00:00Z

Dataset Provider

Google

Earth Engine Snippet

ee.ImageCollection("LANDSAT/LT04/C01/T1_ANNUAL_TOA")

Tags

annual landsat toa usgs

Description

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.

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 most recent pixel as the composite value.

Bands

Resolution
30 meters

Bands

Name	Wavelength	Description
B1	0.45 - 0.52 μm	Blue
B2	0.52 - 0.60 μm	Green
B3	0.63 - 0.69 μm	Red
B4	0.76 - 0.90 μm	Near infrared
B5	1.55 - 1.75 μm	Shortwave infrared 1
B6	10.40 - 12.50 μm	Thermal Infrared 1. Resampled from 60m to 30m.
B7	2.08 - 2.35 μm	Shortwave infrared 2
BQA		Landsat Collection 1 QA Bitmask (See Landsat QA page)
Bitmask for BQA Bit 0: Designated Fill 0: No 1: Yes Bit 1: Designated Pixel 0: No 1: Yes Bits 2-3: Radiometric Saturation 0: No bands contain saturation 1: 1-2 bands contain saturation 2: 3-4 bands contain saturation 3: 5 or more bands contain saturation Bit 4: Cloud 0: No 1: Yes Bits 5-6: Cloud Confidence 0: Not Determined / Condition does not exist. 1: Low, (0-33 percent confidence) 2: Medium, (34-66 percent confidence) 3: High, (67-100 percent confidence) Bits 7-8: Cloud Shadow Confidence 0: Not Determined / Condition does not exist. 1: Low, (0-33 percent confidence) 2: Medium, (34-66 percent confidence) 3: High, (67-100 percent confidence) Bits 9-10: Snow / Ice Confidence 0: Not Determined / Condition does not exist. 1: Low, (0-33 percent confidence) 2: Medium, (34-66 percent confidence) 3: High, (67-100 percent confidence)

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.

Important: Earth Engine is a platform for petabyte-scale scientific analysis and visualization of geospatial datasets, both for public benefit and for business and government users. Earth Engine is free to use for research, education, and nonprofit use. To get started, please register for Earth Engine access.

Landsat 4 TM Collection 1 Tier 1 Annual TOA Reflectance Composite

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. These composites are created from all the scenes in each annual period beginning from the first day …

LANDSAT/LT04/C01/T1_ANNUAL_TOA, annual,landsat,toa,usgs

1982-01-01T00:00:00Z/1993-01-01T00:00:00Z

Google Earth Engine

https://developers.google.com/earth-engine/datasets