albedo: Calculates Broadband Albedo from Landsat data
In midraed/water: Actual Evapotranspiration with Energy Balance Models

Description Usage Arguments Details Author(s) References See Also

Broadband surface Albedo is estimated considering the integration of all narrowband at-surface reflectances following a weighting function with empirical coefficients (Tasumi et al., 2007).

1	albedo(image.SR, aoi, coeff = "Tasumi", sat = "auto")

`image.SR`	surface reflectance image with bands B, R, G, NIR, SWIR1, SWIR2
`aoi`	area of interest to crop images, if waterOptions("autoAoi") == TRUE will look for any object called aoi on .GlobalEnv
`coeff`	coefficient to transform narrow to broad band albedo. See Details.
`sat`	"L7" for Landsat 7, "L8" for Landsat 8 or "auto" to guess from filenames

There are differents models to convert narrowband data to broadband albedo. You can choose coeff="Tasumi" to use Tasumi et al (2008) coefficients, calculated for Landsat 7; coeff="Liang" to use Liang Landsat 7 coefficients or "Olmedo" to use Olmedo coefficients for Landsat 8.

Guillermo Federico Olmedo

Fonseca-Luengo, David

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
M. Tasumi, Allen, R. G., and Trezza, R. 2007. "Estimation of at-surface reflection albedo from satellite for routine operational calculation of land surface energy balance". J. Hydrol. Eng.
Liang, S. (2000). Narrowband to broadband conversions of land surface albedo: I. Algorithms. Remote Sensing of Environment, 76(1), 213-238.

Other net radiation related functions: LAI(), METRICtopo(), SWtrasmisivity(), incLWradiation(), incSWradiation(), netRadiation(), outLWradiation(), soilHeatFlux(), solarAngles(), surfaceTemperature()