Parse longitude values
Errors
Throws warnings on parsing errors, and returns NaN in each case
Types of errors:
invalid argument: e.g., letters passed instead of numbers, see https://en.cppreference.com/w/cpp/error/invalid_argument
out of range: numbers of out acceptable range, see https://en.cppreference.com/w/cpp/error/out_of_range
out of longitude range: not within -180/360 range
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")
} # }