lonLatFilter: Filter lon/lat positions that fall within defined boundaries

In marchtaylor/sinkr: Collection of functions with emphasis on multivariate data analysis

Filter lon/lat positions that fall within defined boundaries

Description

lonLatFilter Tests whether lon/lat positions fall within a defined box of lon/lat borders. Exact matches with southern and western borders are included.

Usage

lonLatFilter(lon_vector, lat_vector, west, east, south, north)

Arguments

lon_vector	Longitude 1 (in decimal degrees)
lat_vector	Latitude 1 (in decimal degrees)
west	West longitude border (decimal degrees)
east	East longitude border (decimal degrees)
south	South latitude border (decimal degrees)
north	North latitude border (decimal degrees)

Value

Vector of position inclusion in the defined lon/lat borders

Examples

set.seed(1)
n <- 1000
Pos <- list(lon=runif(n, min=-180, max=180), lat=runif(n, min=-180, max=180))
# Check to see if positions are withing boundaries
res <- lonLatFilter(Pos$lon, Pos$lat, -20, 20, -40, 40) 
# Plot
op <- par(mar=c(4,4,1,1))
plot(Pos$lon, Pos$lat, pch=21, col=1, bg=2*res)
rect(-20, -40, 20, 40, border=3)
par(op)

marchtaylor/sinkr documentation built on June 15, 2025, 1:17 a.m.