StrataAreas.fn: Determine strata area.

In nwfscSurveyCode: What the package does (short line)

Description

Determine strata area.

Usage

StrataAreas.fn(strat.df, SA3, convertFactor = 0.01)

Arguments

strat.df	A dataframe describing the strata name, area, and boundaries. Boundaries are determined by latitude and bottom depth. See Details.
SA3	A dataframe of min and max latitude and min and max depth with area for each defined square. See Details.
convertFactor	Multiplier on the area in SA3. Default = 0.01 to convert hectares to square km.

Details

strat.df is a dataframe with a column called “name” and two columns for each stratum variable (START_LATITUDE and BOTTOM_DEPTH) indicating the low and high bounds. The columns for each stratum variable should be named with the stratum variable name followed by .1 for the low bound and .2 for the high bound. For example, this is what a strat.df would look like (as called in the example below). \beginverbatim name area START_LATITUDE.2 START_LATITUDE.1 BOTTOM_DEPTH.1 BOTTOM_DEPTH.2 A 5829 49.0 45.0 183 549 B 4024 49.0 45.0 549 900 C 9259 49.0 40.5 900 1280 D 6211 45.0 40.5 183 549 E 5264 45.0 40.5 549 900 F 6952 40.5 34.5 183 549 G 7801 40.5 34.5 549 900 H 8059 40.5 34.5 900 1280 \endverbatim

SA3 is provided in this package.

Value

Returns the dataframe input with a column called area.

Author(s)

Allan Hicks with help from John Wallace.

nwfscSurveyCode documentation built on May 2, 2019, 5:27 p.m.