Skip to contents

Map observed vessel locations

Source: R/map_plot.R
map_plot.Rd

Plot observed locations on a map. For large datasets, it is best to plot a subset of points. Use percshown to randomly subset the number of points. If the predefined map extent needs adjusting, use minmax.

Usage

map_plot(dat, project, lat, lon, minmax = NULL, percshown = NULL)

Arguments

dat

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

project

String, project name.

lat

Variable in dat that defines latitude, in decimal degrees.

lon

Variable in dat that defines longitude, in decimal degrees.

minmax

Optional map extent argument, a vector (num) of length four corresponding to c(minlat, maxlat, minlon, maxlon).

percshown

Whole number, percent of points to show. Use this option if there are a lot of data points.

Value

mapout: ggplot2 object

Examples

if (FALSE) {
map_plot(pollockMainDataTable, 'pollock', 'LonLat_START_LAT', 'LonLat_START_LON', percshown=10)
}