SatRbedo - Tools for Retrieving Snow and Ice Albedo from Optical Satellite Imagery

The package consists of a set of tools for retrieving snow and ice albedo from optical satellite imagery (e.g., Landsat and Sentinel-2). The tools require the following gridded datasets: (1) atmospherically-corrected surface reflectance, (2) a digital elevation model (DEM), and (3) satellite and solar azimuth and zenith angles. The package includes tools for: image pre-processing (crop grids to a specified extent, project grids with different coordinate systems, and convert data from integer to floating point); convert nadir satellite observations to off-nadir values using view-angle corrections; detect and mask topographic shadows; automatic discrimination of snow and ice surfaces; anisotropic correction of reflected radiation of glacier snow and ice using empirical parameterizations of the bidirectional reflectance distribution function (BRDF); topographic correction; and narrow-to-broadband albedo conversion.