echosounder-class {oce}R Documentation

Class to store echosounder data

Description

Class to store echosounder data, with standard slots metadata, data and processingLog. The data slot is a list containing

Methods

Accessing values. Data may be accessed as e.g. echosounder[["time"]], echosounder[["depth"]], echosounder[["a"]], etc. Items in metadata must be specifield by full name, but those in data may be abbreviated, so long as the abbreviation is unique. In addition to the actual data, some derived fields are also available: echosounder[["distance"]] calls geodDist to compute calculate distance along the ship track, echosounder[["Sv"]] returns a matrix of backscatter strength in DB, and echosounder[["TS"]] returns a matrix of target strength in dB.

Assigning values. Everything that may be accessed may also be assigned, e.g. echosounder[["time"]] <- 3600 + echosounder[["time"]] adds an hour to time.

Overview of contents. The show method (e.g. show(echosounder)) displays information about the object.

Author(s)

Dan Kelley

See Also

A file containing echosounder data may be read with read.echosounder, and a echosounder object can also be created with as.echosounder.

Statistical summaries are provided by summary.echosounder, while show displays an overview. The findBottom function infers the ocean bottom from tracing the strongest reflector from ping to ping.

Echosounder objects may be plotted with plot.echosounder.

The contents of echosounder objects may be altered with subset.echosounder, or with the the [[]] scheme discussed in the previous section; skilled users may also manipulate the contents directly, but this is not recommended because it is brittle to changes in the data structure.


[Package oce version 0.9-18 Index]