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Provisional Landsat 8 Surface Reflectance Data Available

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Provisional Landsat 8 Surface Reflectance Data Available

Provisional Landsat 8 Operational Land Imager (OLI) Surface Reflectance (SR) data products are now available through the Earth Resources Observation and Science (EROS) Center Science Processing Architecture (ESPA) On Demand Interface and EarthExplorer (EE)*.

As currently produced for Landsat 4-5 and Landsat 7 scenes, top-of-atmosphere (TOA) reflectance, Surface Reflectance (SR), and SR-based spectral indices data products are available for Landsat 8 scenes through the ESPA interface. Please Note: currently, only Landsat 8 scenes acquired from April 11, 2013 (DOY 101) through December 18, 2014 (DOY 352) can be processed to Surface Reflectance, due to the recent change of the Thermal Infrared Sensor (TIRS) acquired data. Please see the December 22, 2014 Landsat Mission Headline for more details.

*The Surface Reflectance (SR) data product is the only option available using EarthExplorer (EE) under the Landsat CDR Data Sets. Orders submitted from EE are sent to the ESPA On-Demand interface for processing and data delivery.

It is important to note that Landsat 8 scenes will not be processed with the same algorithm used for Landsat 4, 5, and 7 scenes. A new algorithm (L8SR) has been developed to take advantage of Landsat 8’s unique characteristics. 

The L8SR algorithm uses the scene center for the sun angle calculation and then hard-codes the view zenith angle to 0. The solar zenith and view zenith angles are used for calculations as part of the atmospheric correction. In the future, the surface reflectance algorithms may be modified for Landsats 4, 5, 7, and 8 to calculate sun angles on a per-pixel basis.

The tables below provide information about the L8SR algorithm and the Provisional Landsat 8 Surface Reflectance products. Users are encouraged to review this documentation and the Provisional Landsat 8 Surface Reflectance Product Guide.

Questions and feedback about Provisional Landsat 8 Surface Reflectance data products can be sent to USGS Customer Services at custserv@usgs.gov.

Landsat 8 SR algorithm compared to the existing LEDAPS algorithm (for Landsat 4-5 and 7)

Parameter Landsat 4-5, 7 (LEDAPS) Landsat 8 OLI (L8SR)
(Original) research grant NASA GSFC, MEaSUREs (Masek) NASA GSFC
Global coverage Yes Yes
TOA Visible (1-5,7) + Brightness temp (6)
bands
Visible (1-7) +Thermal (10-11)  bands
SR Visible (1-5,7)  bands Visible (1-7)  bands
Radiative transfer model 6S Internal algorithm
Thermal correction level TOA only TOA only
Thermal band units Kelvin Kelvin
Pressure NCEP Grid Surface pressure is calculated
internally based on the elevation
Water vapor NCEP Grid MODIS CMA
Air temperature NCEP Grid MODIS CMA
DEM Global Climate Model DEM Global Climate Model DEM
Ozone  OMI/TOMS MODIS CMG Coarse resolution ozone
AOT Correlation between chlorophyll
absorption and bound water absorption
of scene
MODIS CMA
Sun angle Scene center from input metadata Scene center from input metadata
View zenith angle From input metadata Hard-coded to 0
Undesirable zenith angle correction N/A TOA substituted for SR when solar zenith angle
> 76 degrees
Pan ban processed? No No
XML metadata? Yes Yes
Brightness temperature calculated Yes (Band 6 TM/ETM+) Yes (Bands 10 & 11 TIRS)
Cloud mask CFmask CFmask
Data format INT16 INT16
Fill values -9999 -9999
QA bands Cloud
Adjacent cloud
Cloud shadow
DDV
Fill
Land water
Snow
Atmospheric opacity
Cloud
Adjacent cloud
Cloud shadow
Aerosols
Cirrus

6S=Second Simulation of a Satellite Signal in the Solar Spectrum, AOT= Aerosol Optical Thickness, CFmask=C Version of Function Of Mask,
CMA= Climate Modeling Grid - Aerosol, CMG= Climate Modeling Grid, DDV= Dark Dense Vegetation, DEM= Digital Elevation Model,
ETM+= Enhanced Thematic Mapper Plus, GSFC= Goddard Space Flight Center, INT= Integer, MEaSUREs= Making Earth Science Data Records
for Use in Research Environments, MODIS= Moderate Resolution Imaging Spectroradiometer, N/A=Not Applicable, NASA=National
Aeronautics and Space Administration, NCEP= National Centers for Environmental Prediction, OLI=Operational Land Imager,
OMI= Ozone Monitoring Instrument, QA=Quality Assurance, SR= Surface Reflectance, TIRS= Thermal Infrared Sensor, TM= Thematic
Mapper, TOA= Top of Atmosphere Reflectance, TOMS= Total Ozone Mapping Spectrometer, XML= Extensible Markup Language

Provisional Landsat 8 Surface Reflectance (SR) Specifications

Band Designation Band Name Data Type Units Range Valid Range Fill Value Saturate Value Scale Factor
sr_band1 Band 1 INT16 Reflectance -2000 - 16000 0 - 10000 -9999 20000 0.0001
sr_band2 Band 2 INT16 Reflectance -2000 - 16000 0 - 10000 -9999 20000 0.0001
sr_band3 Band 3 INT16 Reflectance -2000 - 16000 0 - 10000 -9999 20000 0.0001
sr_band4 Band 4 INT16 Reflectance -2000 -16000 0 - 10000 -9999 20000 0.0001
sr_band5 Band 5 INT16 Reflectance -2000 - 16000 0 - 10000 -9999 20000 0.0001
sr_band6 Band 6 INT16 Reflectance -2000 - 16000 0 - 10000 -9999 20000 0.0001
sr_band7 Band 7 INT16 Reflectance -2000 - 16000 0 - 10000 -9999 20000 0.0001
sr_cloud Cloud QA UINT8 Flag 0-7 0-7 NA NA NA

INT16=16-bit signed integer, UINT8=8-bit unsigned integer, QA= quality assurance, CFmask= C version of Function of Mask, NA=not applicable

Provisional Landsat 8 SR Cloud Quality Assurance Bit Values

Bit Interpretation
0 Cirrus cloud
1 Cloud
2 Adjacent to cloud
3 Cloud shadow
4 Aerosol
5 Aerosol
6 Unused
7 Internal test

Provisional Landsat 8 SR Cloud Quality Assurance Interpreted Aerosol Values

Value Interpretation
16 Low aerosol content
32 Moderate aerosol content
48 High aerosol content

Provisional Landsat 8 SR Top of Atmosphere Reflectance - Bands 1-5, 7 Specifications

Band Designation Band Name Data Type Units Range Valid Range Fill Value Saturate Value Scale Factor
toa_band1 Band 1 Reflectance INT16 Reflectance -100 - 16000 0 - 10000 -9999 20000 0.0001
toa_band2 Band 2 Reflectance INT16 Reflectance -100 -16000 0 - 10000 -9999 20000 0.0001
toa_band3 Band 3 Reflectance INT16 Reflectance -100 -16000 0 - 10000 -9999 20000 0.0001
toa_band4 Band 4 Reflectance INT16 Reflectance -100 -16000 0 - 10000 -9999 20000 0.0001
toa_band5 Band 5 Reflectance INT16 Reflectance -100 - 16000 0 - 10000 -9999 20000 0.0001
toa_band6 Band 6 Reflectance INT16 Reflectance -100 - 16000 0 - 10000 -9999 20000 0.0001
toa_band7 Band 7 Reflectance INT16 Reflectance -100 - 16000 0 - 10000 -9999 20000 0.0001
toa_band9 Band 9 Reflectance INT16 Reflectance -100 - 16000 0 - 10000 -9999 20000 0.0001

INT16=16-bit signed integer, TOA= top of atmosphere

Provisional Top of Atmosphere Reflectance - Bands 10-11 Brightness Temperature Specifications

Band Designation Band Name Data Type Units Range Valid Range Fill Value Saturate Value Scale Factor
toa_band10 Band 10 Reflectance INT16 Reflectance -100 - 16000 0-10000 -9999 20000 0.1
toa_band11 Band 11 Reflectance INT16 Reflectance -100 - 16000 0-10000 -9999 20000 0.1

INT16=16-bit signed integer, TOA= top of atmosphere

 

 

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