checkLL: lat-long coordinate check

In OSMscale: Add a Scale Bar to 'OpenStreetMap' Plots

lat-long coordinate check

Description

check lat-long coordinates for plausibility

Usage

checkLL(lat, long, data, fun = stop, quiet = FALSE, ...)

Arguments

lat, long	Latitude (North/South) and longitude (East/West) coordinates in decimal degrees
data	Optional: data.frame with the columns lat and long
fun	One of the functions stop, warning, or message. DEFAULT: stop
quiet	Logical: suppress non-df warning in getColumn? DEFAULT: FALSE
...	Further arguments passed to fun

Value

Invisible T/F vector showing which of the coordinates is violated in the order: minlat, maxlat, minlong, maxlong. Only returned if check is passed or fun != stop

Author(s)

Berry Boessenkool, [e-mail], Aug 2016

See Also

pointsMap, putm, berryFunctions::checkFile

Examples

checkLL(lat=52, long=130)
checkLL(130, 52, fun=message)
checkLL(85:95, 0, fun=message)

d <- data.frame(x=0, y=0)
checkLL(y,x, d)

# informative errors:
library("berryFunctions")
is.error(   checkLL(85:95, 0, fun="message"),  tell=TRUE)
is.error(   checkLL(170,35),  tell=TRUE)

mustfail <- function(expr) stopifnot(berryFunctions::is.error(expr))
mustfail( checkLL(100)         )
mustfail( checkLL(100, 200)    )
mustfail( checkLL(-100, 200)   )
mustfail( checkLL(90.000001, 0)   )

OSMscale documentation built on Oct. 13, 2023, 5:10 p.m.