parse_lon: Parse longitude values

In parzer: Parse Messy Geographic Coordinates

Description

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:

• 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("")
## Not run: 
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")

## End(Not run)

parzer documentation built on Dec. 20, 2021, 5:08 p.m.