Contents
What are surface reflectance?
Surface reflectance is the amount of light reflected by the surface of the Earth. It is a ratio of surface radiance to surface irradiance, and as such is unitless, with values between 0 and 1.
What is surface reflectance in remote sensing?
Surface reflectance (ρ) is defined as the fraction of incoming solar radiation that is reflected from Earth’s surface for specific incident or viewing cases (directional, conical, and hemispherical cases). From: Comprehensive Remote Sensing, 2018.
How do you calculate surface reflectance?
Reflectivity can be calculated as p(y) = Gr(y)/Gi(y) where p is the reflectivity, y is the wavelength of the light, Gr is the reflected radiation and Gi is the incident radiation. Calculate reflectance from the reflectivity. Reflectance is the square of the reflectivity so q(y) = (Gr(y)/Gi(y))^2.
Why are corrections to at surface reflectance necessary?
Calibrating imagery to apparent surface reflectance yields the most accurate results with spectral indices. This is especially important for hyperspectral sensors. It also ensures consistency when comparing indices over time and from different sensors.
What is TOA and BOA?
TOA: Top of the Atmosphere BOA: Bottom of the Atmosphere.
What is the reflectance code for Landsat 8?
The Landsat 8 Collection 1 Land Surface Reflectance Code (LaSRC) Product Guide contains details about the LaSRC algorithm and the Landsat 8 Surface Reflectance data products created from it.
What do you need to know about Landsat 4-7?
The Landsat 4-7 Collection 1 Surface Reflectance Code LEDAPS Product Guide describes the LEDAPS algorithm and the Collection 1 Surface Reflectance data products created from it.
What are the tiers in Landsat Collection 1?
Landsat Collection Tiers are the inventory structure for Level-1 data products and are based on data quality and level of processing.
What does a Landsat geometric verify file do?
Landsat Geometric Verify Image and Report files are provided in Landsat 1-5 MSS)Collection 1 Tier 1 data products. These files help determine the geometric accuracy of each MSS precision and terrain-corrected scene and contain summary statistics while listing all verification points.