water (version 0.5)

incLWradiation: Calculates long wave incoming radiation

Description

This function estimates the long wave incoming radiation using the Stefan-Boltzmann equation. In addition, empirical equation of Bastiaanssen (1995) with coefficients developed by Allen (2000) are used to estimate the effective atmospheric emissivity.

Usage

incLWradiation(WeatherStation, DEM, solar.angles, Ts)

Arguments

WeatherStation

Weather Station data

DEM

digital elevation model in meters.

solar.angles

rasterStack with latitude, declination, hour.angle, incidence.hor and incidence.rel. See solarAngles()

Ts

Land surface temperature. See surfaceTemperature()

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

Bastiaanssen W. Regionalization of surface flux densities and moisture indicators in composite terrain: A remote sensing approach under clear skies in Mediterranean climates. Ph.D. dissertation, CIP Data Koninklijke Bibliotheek, Den Haag, The Netherlands, 1995, p273

Allen R. RAPID long-wave radiation calculations and model comparisons Internal report, University of Idaho, Kimberly, Idaho, 2000