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Parse longitude values

Usage

parse_lon(lon, format = NULL)

Arguments

lon

(numeric/integer/character) one or more longitude values

format

(character) format, default often works

Value

numeric vector

Errors

Throws warnings on parsing errors, and returns NaN in each case

Types of errors:

Examples

parse_lon("")
#> [1] NaN
if (FALSE) { # \dontrun{
parse_lon("-181")
parse_lon("-361")
parse_lon("95")
parse_lon("asdfaf")

parse_lon("45")
parse_lon("-45")
parse_lon("-45.2323")
parse_lon("334")

# out of range with std::stod?
parse_lon("-45.23232e24")
parse_lon("-45.23232e2")
parse_lon("-45.23232")

# numeric input
parse_lon(1:10)
parse_lon(85:94)

# different formats
parse_lon("40.4183318 E")
parse_lon("40.4183318 W")
parse_lon("40 25 5.994") # => 40.41833

parse_lon("40.4183318W")
parse_lon("W40.4183318")
parse_lon("E40.4183318")
parse_lon("40.4183318E")

parse_lon("E 39 21.440") # => 39.35733
parse_lon("W 56 1.389") # => -56.02315

parse_lon("E40°25’5.994") # => 40.41833
parse_lon("40° 25´ 5.994\" E") # => 40.41833
parse_lon("40:25:6E")
parse_lon("40:25:5.994E")
parse_lon("40d 25’ 6\" E")
} # }