METRIC.EB: Estimates Energy Balance using METRIC2010 Model

In ffuentesp7/METRICforR: Actual Evapotranspiration with Energy Balance models

Description

Estimates Energy Balance using METRIC2010 Model

Usage

METRIC.EB(image.DN, WeatherStation, MTL, sat = "auto", thermalband,
  plain = TRUE, DEM, aoi, alb.coeff = "Tasumi", LAI.method = "metric2010",
  Zom.method = "short.crops", anchors.method = "CITRA-MCB",
  ETp.coef = 1.05, Z.om.ws = 0.0018, ESPA = FALSE)

Arguments

image.DN	raw imagen in digital counts to evaluate
WeatherStation	Weather Station data, can be a waterWeatherStation object
MTL	Landsat metadata file
sat	Landsat satellite version. "L7" or "L8"
thermalband	Landsat low gain thermalband
plain	Logical. If TRUE surface is assumed plain
DEM	Digital Elevation Model of the study area. Not needed if plain = TRUE
aoi	SpatialPolygon object with limits of Area of interest
alb.coeff	coefficient to transform narrow to broad band albedo. See Details.
LAI.method	Method used to estimate LAI from spectral data. See Details.
Zom.method	method selected to calculate momentum roughness length. Use "short.crops" for short crops methods from Allen et al (2007); "custom" for custom method also in Allen et al (2007); Or "Perrier" to use Perrier equation as in Santos et al (2012) and Pocas et al (2014).
anchors.method	method to select anchor pixels. Currently only "CITRA-MCB" automatic method available.
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
ESPA	Logical. If TRUE will look for espa.usgs.gov related products on working folder

Details

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

Author(s)

Guillermo F Olmedo, [e-mail]

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

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