calcH: Iterative function to estimate H and R.ah
In ffuentesp7/METRICforR: Actual Evapotranspiration with Energy Balance models

Description Usage Arguments Author(s) References

generates an iterative solution to estimate r.ah and H because both are unknown at each pixel.

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calcH(anchors, Ts, Z.om, WeatherStation, ETp.coef = 1.05, Z.om.ws = 0.0018,
  sat = "auto", ESPA = F, mountainous = FALSE, DEM, Rn, G,
  verbose = FALSE)

`anchors`	anchors points. Can be the result from calcAnchors() or a spatialPointDataframe o Dataframe with X, Y, and type. type should be "cold" or "hot"
`Ts`	Land surface temperature in K. See surfaceTemperature()
`Z.om`	momentum roughness lenght. See momentumRoughnessLength()
`WeatherStation`	WeatherStation data at the flyby from the satellite. Can be a waterWeatherStation object calculate using read.WSdata and MTL file
`ETp.coef`	ETp coefficient usually 1.05 or 1.2 for alfalfa
`Z.om.ws`	momentum roughness lenght for WeatherStation. Usually 0.0018 or 0.03 for long grass
`sat`	satellite sensor used for NDVI. Can be "L7" or "L8"
`ESPA`	Logical. If TRUE will look for espa.usgs.gov realted products on working folder
`mountainous`	Logical. If TRUE heat transfer equation will be adjusted for mountainous terrain
`DEM`	Digital Elevation Model in meters.
`Rn`	Net radiation. See netRadiation()
`G`	Soil Heat Flux. See soilHeatFlux()
`verbose`	Logical. If TRUE will print aditional data to console

Guillermo Federico Olmedo

de la Fuente-Saiz, Daniel

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

Allen, R., Irmak, A., Trezza, R., Hendrickx, J.M.H., Bastiaanssen, W., Kjaersgaard, J., 2011. Satellite-based ET estimation in agriculture using SEBAL and METRIC. Hydrol. Process. 25, 4011-4027. doi:10.1002/hyp.8408

ffuentesp7/METRICforR documentation built on May 15, 2019, 11:57 a.m.