将MapKit纬度和经度转换为DMS格式 [英] Convert MapKit latitude and longitude to DMS format

问题描述

我可以使用以下内容确定地图中心位置的纬度和经度：

I am able to determine the latitude and longitude of a location in the center of a map with the following:

func TargetGridReference(outletMapView_PrimaryTargetLocationMap: MKMapView, regionDidChangeAnimated animated: Bool) {

    let ThreatGridReference = outletMapView_PrimaryTargetLocationMap.centerCoordinate

    let mapLatitude = String(format:"%.13f",ThreatGridReference.latitude)

    let mapLongitude = String(format:"%.13f",ThreatGridReference.longitude)
    let latAndLong = "Lat: \(mapLatitude) \nLong: \(mapLongitude)"

    self.outletLabel_TargetGridReference.text = latAndLong

    tempThreatGridReference = ThreatGridReference
    tempThreatGridReferenceLat = mapLatitude
    tempThreatGridReferenceLon = mapLongitude

}

这给了我巴黎艾菲尔铁塔的纬度：

This gives me the latitude for the Eiffel Tower in Paris as:

Lat:  48.8582487759147
Long:  2.2945180844931

如何在Swift中将上述内容转换为以下DMS格式？ ：

How can I convert the above to the following DMS format in Swift?:

lat: 48° 51' 29.6956" N
long: 2° 17' 40.2651" E

MapKit能否自动转换为各种坐标系统，如UTM，UPS，MGRS等？

Does MapKit provide automatic conversion into the various coordinate systems like UTM, UPS, MGRS, etc?

推荐答案

不幸的是，没有自动转换，但你可以轻松创建一个如下：

Unfortunately there is no automatic conversion but you can easily create one as follow:

Swift 4 或更高版本

func coordinateToDMS(latitude: Double, longitude: Double) -> (latitude: String, longitude: String) {
    let latDegrees = abs(Int(latitude))
    let latMinutes = abs(Int((latitude * 3600).truncatingRemainder(dividingBy: 3600) / 60))
    let latSeconds = Double(abs((latitude * 3600).truncatingRemainder(dividingBy: 3600).truncatingRemainder(dividingBy: 60)))

    let lonDegrees = abs(Int(longitude))
    let lonMinutes = abs(Int((longitude * 3600).truncatingRemainder(dividingBy: 3600) / 60))
    let lonSeconds = Double(abs((longitude * 3600).truncatingRemainder(dividingBy: 3600).truncatingRemainder(dividingBy: 60) ))

    return (String(format:"%d° %d' %.4f\" %@", latDegrees, latMinutes, latSeconds, latitude >= 0 ? "N" : "S"),
            String(format:"%d° %d' %.4f\" %@", lonDegrees, lonMinutes, lonSeconds, longitude >= 0 ? "E" : "W"))
}

---

---

let dms = coordinateToDMS(latitude: 48.8582487759147, longitude: 2.2945180844931)

print(dms.latitude)  // "48° 51' 29.6956" N"
print(dms.longitude) // "2° 17' 40.2651" E"

您还可以扩展CLLocationCoordinate2D以获取您的纬度/经度DMS描述：

You can also extend CLLocationCoordinate2D to get your latitude/longitude DMS description:

import MapKit
extension FloatingPoint {
    var minutes:  Self {
        return (self*3600)
            .truncatingRemainder(dividingBy: 3600)/60
    }
    var seconds:  Self {
        return (self*3600)
            .truncatingRemainder(dividingBy: 3600)
            .truncatingRemainder(dividingBy: 60)
    }
}
extension CLLocationCoordinate2D {
    var dms: (latitude: String, longitude: String) {
        return (String(format:"%d° %d' %.4f\" %@",
                       Int(abs(latitude)),
                       Int(abs(latitude.minutes)),
                       abs(latitude.seconds),
                       latitude >= 0 ? "N" : "S"),
                String(format:"%d° %d' %.4f\" %@",
                       Int(abs(longitude)),
                       Int(abs(longitude.minutes)),
                       abs(longitude.seconds),
                       longitude >= 0 ? "E" : "W"))
    }
}

---

---

let coord = CLLocationCoordinate2D(latitude: 48.8582487759147, longitude: 2.2945180844931)

coord.dms.latitude   // "48° 51' 29.6956" N"
coord.dms.longitude  // "2° 17' 40.2651" E"

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