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Creates haul midpoint latitude and longitude variables

Source: R/create_variables.R
create_mid_haul.Rd

Calculates latitude and longitude of the haul midpoint and adds two variables to the primary data set: the midpoint latitude and the midpoint longitude.

Usage

create_mid_haul(
  dat,
  project,
  start = c("lon", "lat"),
  end = c("lon", "lat"),
  name = "mid_haul"
)

Arguments

dat

Primary data containing information on hauls or trips. Table in the FishSET database contains the string 'MainDataTable'.

project

Project name.

start

Character string, variables in dat defining the longitude and latitude of the starting location of haul. Must be in decimal degrees.

end

Character string, variables in dat defining the longitude and latitude of the ending location of haul. Must be in decimal degrees.

name

String, name of new variable. Defaults to `mid_haul`.

Value

Returns primary dataset with two new variables added: latitude and longitude of haul midpoint.

Details

Each row of data must be a unique haul. Requires a start and end point for each observation.

Examples

if (FALSE) {
pollockMainDataTable <- create_mid_haul(pollockMainDataTable, 'pollock', 
    start = c('LonLat_START_LON', 'LonLat_START_LAT'), 
   end = c('LonLat_END_LON', 'LonLat_END_LAT'), name = 'mid_haul')
}