monhourlyssi: Analyse and plot hourly EUMETSAT OSISAF SSI validation data

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

Description

ASCII collocation files containing hourly values of OSISAF estimates and in situ observations of Surface Shortwave Irradiance (SSI) are read, basic statistics are generated and the results are plotted for validation purposes.

Usage

monhourlyssi(file,method="S",printIt=FALSE,thc=1.1,tho=1.9,sat="a") 

Arguments

file	collocation file to read
method	specification of which methods that are available for analysis. The methods currently implemented are scatter plot (S), scatterplot for clear sky (SC), scatterplot for overcast (SO), difference plot as function of vector index (D), difference plot for solar zenith angle (DSOZ), difference plot as function of satellite zenith angle (DSAZ), difference plot as function of relative azimuth angle (DRAZ), boxplot for satellites (DSAT), boxplots for satellites for clear sky (DSATC) and overcast sky (DSATO) as determined by NWCSAF PPS cloudtypes, and using both NWCSAF PPS and in situ measurements of minutes of direct insolation (DSATCC and DSATOO, use thc and tho with these), difference plot as function of observed direct insolation in minutes (DST), difference plot as function of NWCSAF PPS cloudtypes (DC), difference plot as function of hour of the day (DH), boxplots for observation sites (POS), for this method POSC, POSO, POSCC and POSOO are also available, difference as function of time (DTS), DTSC, DTSO, DTSCC, DTSOO are also available for this choice and finally the NWCSAF cloudtype can be plotted agains the measurement of minutes of direct insolation at the station (STCC).
thc	threshold value for clear sky according to NWCSAF PPS cloudtype.
tho	threshold value for overcast sky according to NWCSAF PPS cloudtype
printIt	print to default printer

Value

None

Note

This function is probably of most interest to the development team as the validation files are not distributed in any manner.

During validation observations surrounding a surface station is averaged. Clear sky is identified by 1 and cloudy sky by 2. The validation files will for every station contain a number between 1 and 2 representing the cloud cover.

Author(s)

Øystein Godøy ([e-mail])

See Also

mondailyssi

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