compareAVHRRchains: Compares several AVHRR images from different processing...

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

Description

Given paths to the results from two different processing chains that share the common file naming convention and format, files are read, statistics are generated and results are presented. This function relies on time specification and area specification for identification of the data. Files from the two directories are listed and compared based upon an expected naming convention for filenames. Statistics are generated for all channels, results are plotted for channels 1,2, 4 and 5 (due to size considerations when dividing the plotting device).

Usage

    compareAVHRRchains(chain1, chain2, area="ns")  

Arguments

chain1	path to files for first processing chain
chain2	path to files for second processing chain
area	area keyword, used for file listing

Value

A matrix containing the results for each channel in the rows. The columns represents the differences between the two processing chains.

Note

At present this function is adapted for some variations in naming conventions used within the processing chains for AVHRR data at the Norwegian Meteorological Institute. Orbit number is not required to be part of the filename, else filenames are expected to be of the type: avhrr_noaa18_20061024_0636_43910_ns.aha, the generic description is avhrr_<satellite name>_<date>_<time>_<orbit number>_<areaname>.aha.

Author(s)

Øystein Godøy ([e-mail])

See Also

readAVHRR, createAVHRRimage, compareAVHRRimages

Examples

    # Specify directories which contain METSAT files
    t <- compareAVHRRchains("/data/noaa/","/data/noaa_old/","ns")

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