How to format GPS latitude and longitude?

Question

In android(java) when you get the current latitude and longitude using the function getlatitude() etc you get the coordinates in decimal format:

latit

Answer 1

I wanted something similar and after studying answers here and Wikipedia, found there is a standard for formatting coordinates, ISO 6709#Annex D which describes the desired text representation for coordinates, considering that and wanting to have a portable and compact implementation in Kotlin, I ended with this code hopefully would be useful for others,

import kotlin.math.abs
import java.util.Locale

// https://en.wikipedia.org/wiki/ISO_6709#Representation_at_the_human_interface_(Annex_D)
fun formatCoordinateISO6709(lat: Double, long: Double, alt: Double? = null) = listOf(
    abs(lat) to if (lat >= 0) "N" else "S", abs(long) to if (long >= 0) "E" else "W"
).joinToString(" ") {
    val degrees = it.first.toInt()
    val minutes = ((it.first - degrees) * 60).toInt()
    val seconds = ((it.first - degrees) * 3600 % 60).toInt()
    "%d°%02d′%02d″%s".format(Locale.US, degrees, minutes, seconds, it.second)
} + (alt?.let { " %s%.1fm".format(Locale.US, if (alt < 0) "−" else "", abs(alt)) } ?: "")