make_segments_isdb: make_segments_isdb

In Maritimes/Mar.utils: A suite of functions used by a variety of Maritimes packages

make_segments_isdb

Description

This function takes a df of the isdb data, and creates line segments for each distinct FISHSET_ID. If specified, it will generate spatial layers within a gpkg file. Each line will have the following columns in the resulting data frame:

• FISHSET_ID This uniquely identifies a set

• LEN_KM This field shows the calculated distance of the resultant line in kms

• SET_NO This uniquely identifies a set

• N_VALID_VERT This field shows how many vertices appear correct after NAs, 0s and other problematic values have been dropped

• SETSTART This is the earliest time associated with a set

• SETEND This is the last time associated with a set

• SET_DUR This is the difference in time (in hours) between the first and last position of a set

Usage

make_segments_isdb(isdb.df, filename = NULL, create.spatial = TRUE)

Arguments

isdb.df	This is the dataframe you want to plot. isdb dataframes are characterized by the existence of one of the following sets of fields: ISSETPROFILE_WIDE - based: FISHSET_ID SET_NO LAT1, LONG1 and DATE_TIME1 LAT2, LONG2 and DATE_TIME2 LAT3, LONG3 and DATE_TIME3 LAT4, LONG4 and DATE_TIME4 or ISSETPROFILE - based FISHSET_ID SET_NO LATITUDE, LONGITUDE, DATETIME and PNTCD_ID
filename	default is NULL. If you are outputting shapefiles, you can specify a name for them here. They will also get a timestamp.
create.spatial	default is TRUE. This indicates whether or not to create a gpkg file in your working directory.

Author(s)

Mike McMahon, [e-mail]

Maritimes/Mar.utils documentation built on Feb. 12, 2024, 11:38 p.m.