METRIC.EB: Estimates Energy Balance using METRIC2010 Model

Description Usage Arguments Details Author(s) References

View source: R/water_METRIC.R

Description

Estimates Energy Balance using METRIC2010 Model

Usage

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METRIC.EB(image.DN, image.SR, WeatherStation, MTL, sat = "auto", thermalband,
  plain = TRUE, DEM, aoi, alb.coeff = "Tasumi", LST.method = "SC",
  LAI.method = "metric2010", Zom.method = "short.crops",
  anchors.method = "CITRA-MCB", n = 1, ETp.coef = 1.05,
  Z.om.ws = 0.0018, verbose = FALSE)

Arguments

image.DN

raw imagen in digital counts to evaluate

image.SR

L8 ONLY. Surface reflectance imagen. water package does not include a model to calculate surface reflectance for Landsat 8 images. Landsat 8 users should download precalculated surface reflectances from espa website (espa.cr.usgs.gov).

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.

LST.method

Method for land surface temperature estimation. "SC" for single channel or "SW" for split window algorithm. "SW" is only available for L8. See water::surfaceTemperature

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.

n

number of pair of anchors pixels to calculate

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

verbose

Logical. If TRUE will print aditional data to console

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, guillermo.olmedo@gmail.com

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


water documentation built on May 19, 2017, 3:47 p.m.

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