Metadata, aspect and slope maps are combined to estimate solar angles for the entire image.
Usage
solarAngles(surface.model, MTL, WeatherStation)
Arguments
surface.model
rasterStack with DEM, Slope and Aspect. See surface.model()
MTL
Landsat Metadata File
WeatherStation
Weather Station data
Details
Narrowband transmittances,are calculated considering some radiation transfer models operated
over a wide range of climates and locations across the world, this parameter vary with the cosine of
the solar angle, atmospheric pressure and precipitable water vapor in the atmosphere, so the author must
obtain accurate values of these three parameters.
References
R. G. Allen, M. Tasumi, and R. Trezza, "Satellite-based energy balance for mapping evapotranspiration with internalized calibration (METRIC) - Model" Journal of Irrigation and Drainage Engineering, vol. 133, p. 380, 2007