Calculates solar angles

Description

Metadata, aspect and slope maps are combined to estimate solar angles for the entire image.

Usage

1
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.

Author(s)

Guillermo Federico Olmedo

Fonseca-Luengo, David

Fernando Fuentes PeƱailillo

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

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