das_effort_strata: Split effort by strata

In swfscDAS: Southwest Fisheries Science Center Shipboard DAS Data Processing

Split effort by strata

Description

Split DAS effort where it intersects with a stratum boundary

Usage

das_effort_strata(x, ...)

## S3 method for class 'data.frame'
das_effort_strata(x, ...)

## S3 method for class 'das_df'
das_effort_strata(x, strata.files, ...)

Arguments

x	an object of class das_df, or a data frame that can be coerced to class das_df
...	ignored
strata.files	list of path(s) of the stratum CSV file(s); see das_effort

Details

This function should only be called by das_effort, i.e. it should not be called by users in their personal scripts. Practically speaking, this functions splits the effort line wherever it crosses a stratum line. This point of intersection is interpolated; specifically, it is determined using st_intersection. Thus, any effort will be first split at these effort-stratum boundary intersection points, and then using the specified method (e.g. condition).

Value

The data frame x, with 1) columns added that indicate a) if the point was in a particular stratum (see das_intersects_strata), and b) the index of the stratum in strata.files (column name 'stratum'; 0 if the point intersects with no strata), and 2) two rows added for each strata crossing that occurs between something other than an E and R. These rows are necessary because of how das_effort processes effort. The added rows are the same as the event previous to the strata crossing, except:

• They have the event code "strataE" and "strataR", respectively

• Their coordinates are the coordinates of the intersection of the effort line and the stratum boundary

• Their 'idx_eff' values are plus 0.4 and 0.5, respectively

• The second added row has the same stratum info as the point immediately after the stratum boundary crossing

swfscDAS documentation built on Aug. 10, 2023, 9:06 a.m.