fm_ch3brefl: Estimate the reflectance of AVHRR channel 3b (3.7...

Description Usage Arguments Value Author(s) See Also Examples

Description

Given the brightness temperatures of AVHRR channels 3B and 4, the solar zenith angle and the satellite identification, the reflectance of AVHRR channel 3B is being returned.

The reflectivity returned is adjusted for the instrument response of the actual satellite being used. Currently support is added for NOAA-15 through NOAA-18, no support is added for METOP yet.

Usage

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    fm_ch3brefl(bt3b,bt4, solang, date, satname)

Arguments

bt3b

brightness temperature of AVHRR channel 3B

bt4

brightness temperature of AVHRR channel 4

solang

the solar zenith angle in degrees

date

the corresponding dates as POSIXct objects

satname

name of the satellite e.g. "NOAA-18"

Value

The reflectivity (0-100%) as a value or a vector

Author(s)

Øystein Godøy (o.godoy@met.no)

See Also

fm_bidirrefl, fm_temp2rad, fm_rad2temp, fm_findsollum

Examples

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    # Plotting AVHRR channel 3B reflectances against solar zenith angle
    plot(t$soz,fm_ch3brefl(t$k3b,t$k4,t$soz,t$tid,"NOAA-18"))

steingod/R-mipolsat documentation built on May 30, 2019, 2:31 p.m.