如何使用Geolocator确定纬度是北纬还是南纬，还是西经还是东经？

Question

I'm building an Universal App in WinRT and am able to get the Latitude Longitude of my device using the Geolocator. But for my input I also need the direction (North, South for Latitude and East West for Longitude).

But how do I know if a Latitude or Longitude is within a specific direction? Is there a build-in way, or what would be the calculation to do this?

51.3705 to 51.3705N

6.1724 to 6.1724E

Geoposition GeoPosition = await GeoLocator.GetGeopositionAsync();
double Latitude = GeoPosition.Coordinate.Point.Position.Latitude;
double Longitude = GeoPosition.Coordinate.Point.Position.Longitude;

Kind regards, Niels

Answer 1

Have a look here .

Instead of adding S/N or W/E to indicate the direction, you will get values from -90° (S) to 90° (N) and -180° (W) to 180° (E). The docs doesn't explicitly specify which direction is positive, but what I've written here should be the most common convention.

Answer 2

Common sense :):

private string ConvertLatitudeToGPS(double Latitude)
    {
        string Direction = "";
        double UnformattedLatitude = Latitude;
        if (Latitude > 0)
        {
            Direction = "N";
        }
        else
        {
            UnformattedLatitude = UnformattedLatitude * -1;
            Direction = "S";
        }
        string GPSString = UnformattedLatitude.ToString("0.0000") + Direction;
        return GPSString;
    }

    private string ConvertLongitudeToGPS(double Longitude)
    {
        string Direction = "";
        double UnformattedLongitude = Longitude;
        if (Longitude > 0)
        {
            Direction = "E";
        }
        else
        {
            UnformattedLongitude = UnformattedLongitude * -1;
            Direction = "W";
        }
        string GPSString = UnformattedLongitude.ToString("0.0000") + Direction;
        return GPSString;
    }