plotVAChist: Plot histogram of VAC data for specific classes and features

In steingod/R-osisaf: Useful functions for handling EUMETSAT Ocean and Sea Ice SAF data

Description

Multiple histograms of various features, either single channels or channel combinations are plotted using colours. For details on the feature combinations supported see details below. For details on the classes supported see readVAC.

Usage

    plotVAChist(vac,classes=c("CLOUD","ICE","SEA"),feature="T4",ploline=F,solarcorrect=T, returnhist=F, ...)

Arguments

vac	VAC object as returned by readVAC
classes	Strings describing the classes to plot
feature	String describing the feature to plot, see details for valid features
ploline	Logical toggling histogram style plotting or line style
solarcorrect	Logical telleing whether solar influenced features should be corrected by solzencorrect. This is only done for features composed of single channels and not for thermal channels.
returnhist	Returns a list containing the histograms requested
...	Arguments to be passed to plot and other functions.

Details

The strings defining the features to present are listed below, with a brief introduction:

	A1: Reflectance of AVHRR channel 1 (0.6 micron)
	A2: Reflectance of AVHRR channel 2 (0.9 micron)
	A3: Reflectance of AVHRR channel 3A (1.6 micron)
	T3: Brightness temperature of AVHRR channel 3B (3.7 micron)
	T4: Brightness temperature of AVHRR channel 4 (11.5 micron)
	T5: Brightness temperature of AVHRR channel 5 (12.5 micron)
	R21: Ratio of reflectance in AVHRR channels 2 and 1.
	R31: Ratio of reflectance in AVHRR channels 3A and 1.
	D45: Difference in brightness temperatures in AVHRR channels 4 and 5.
	D34: Difference in brightness temperatures in AVHRR channels 3B and 4. 
    

Value

If requested by logical option returnhist a list containing the histogram objects created within the function is returned.

Author(s)

Øystein Godøy ([e-mail]), but recoded from prototype developed by Steinar Eastwood ([e-mail]).

See Also

readVAC, solzencorrect

steingod/R-osisaf documentation built on May 30, 2019, 2:32 p.m.