Landsat TOA vs SR

You can use the thermal bands from Landsat 8 to calculate at-satellite brightness temperature. Average Landsat TOA to 1km resolution; select “valid” targets for AOT - NDVI > 0.3 - 2.2 mm TOA < 15% - screen for cloud, snow/ice, salt playas . Approximating Landsat Surface Reflectance Previous White Papers have described the concept of Top of Atmosphere (TOA) Reflectance. To compress the huge amount of raw data (32bit float), the original values are quantized (16bit int), which is called digital numbers (DNs). Geography Dept., University of Maryland . The Sentinel-2A and Landsat-8 sensor TOA reflectance data were corrected to surface reflectance using the same algorithm to reduce biases that may occur if different algorithms were used. TOA reflectance is a unitless number that can be computed from satellite spectral radiance, the earth-sun distance in astronomical units, the mean solar exoatmospheric irradiance and the solar zenith angle. A Surface Reflectance product for Landsat/LDCM: Summary of activities, future work and implications for similar class sensors e.g. Compare Reflectance with Solar Angle vs. ENVI Calibrated Reflectance Results: -Negative values are truncated to zero. These index models can be very useful for decision making.

blue and SR blue gives AOT. estimate blue surface reflectance = 0.33*(2.2 mm TOA reflectance) difference between TOA. Since the USGS reports that the Band 11 thermal information from Landsat 8 should no longer be used for quantitative analysis this model has been designed to process only a single band from the input image (usually Landsat 8 Band 10). … From Landsat 7 handbook. -The two histogram curves for two types of calculations have the same shape, but not the same values.

I'm not sure how we'll include the ability to calculate TOA reflectance. – Convert TOA r into degrees kelvin. Feb 6, 2014 • [Source: USGS] Landsat Surface Reflectance Climate Data Records (CDRs) are high level Landsat data products that support land surface change studies.Climate Data Records, as defined by the National Research Council, are a time series of measurements with sufficient length, consistency, and continuity to identify climate variability and change. Currently, surface reflectance (SR), top-of-atmosphere (TOA) reflectance, and SR-based spectral indices can be processed for Landsat 8 scenes acquired April 11, 2013 (DOY 101) through December 18, 2014 (DOY 352) only, due to changes made to Thermal Infrared Sensor (TIRS) data. Landsat 4-5 or Landsat 8 metadata (_MTL.txt file) for the input image. Portland OR, USA 2016-06-25 Top Of Atmosphere (TOA) calculations for Landsat 8. Feb 6, 2014 • [Source: USGS] Landsat Surface Reflectance Climate Data Records (CDRs) are high level Landsat data products that support land surface change studies.Climate Data Records, as defined by the National Research Council, are a time series of measurements with sufficient length, consistency, and continuity to identify climate variability and change. The LaSRC (Land Surface Reflectance Code) algorithm V3.5.5 (Vermote et al., 2016), that has been adapted for Sentinel-2A application, was used in this study. Dr. Chris Justice . Sentinel 2 Principal Investigator Dr. Eric Vermote . The archive was and remains rich with history, adding new observations of the entire planet every eight days.


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