plotAVHRRsig: Plot AVHRR radiometric signatures

In steingod/R-mipolsat: Useful functions for handling locally processed satellite data

Description

Creates various types of contour plots and histograms for AVHRR data collected using libfmcol. If information on the synoptic cloud cover from a visual observation is available, this is used as well.

The objects currently stored in FMCOL files and their numbering is:

1. AVHRR data, a square box of channel data reflectances or brightness temperature and auxiliary information like observation geometry, time, number of pixels etc.

2. NWP data, Numerical Weather Prdeiction data, usually from the operational model suite.

3. STDAT, in situ measurements from GTS SYNOP or DRAU files.

4. SAFCM, NWCSAF PPS cloudtype products.

5. SAFSSI, OSISAF shortwave estimates.

6. SAFDLI, OSISAF longwave estimates.

Usage

    plotAVHRRsig(dataset,feature="a1/soz", suncor=FALSE,ppsclass=0, 
    soztv=90,sky="NA",mylevels=20)

Arguments

dataset	object to plot, must be created by readfmcol and contain at least AVHRR and possibly STDAT information
feature	which radiometric feature to plot. The options available are a1/soz, a2/soz, a3/soz, a2da1/soz, a3da1/soz, a3da1/t4, a3/a1, t4mt5/t4, t3mt4/t4.
suncor	logical telling whether visible information should be cosinus corrected for solar elevation
soztv	threshold value to truncate visible channels at
ppsclass	value to filter data by PPS Cloud Type Class number, 0 is no filtering
sky	string identifying whether cloud cover cinditions should be incurred from STDAT information and used to filter information. Possible values are "NA", "oc" and "cl" representing No filtering, overcast and clear respectively.
mylevels	the number of groups to divide data in when creating contours

Value

A data.frame if histogram was chosen.

Author(s)

Øystein Godøy ([e-mail])

See Also

readfmcol

Examples

    t <- plotAVHRRsig(dataset="/disk2/collocate/output/cloud_20070831.hdf5")

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