| das_effort_strata {swfscDAS} | R Documentation |
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 |
... |
ignored |
strata.files |
list of path(s) of the stratum CSV file(s);
see |
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