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Added enum Hemisphere

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ClemensFischer 2026-01-10 16:21:55 +01:00
parent 4166bd34d1
commit 1f75e9feea
6 changed files with 47 additions and 41 deletions
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8
MapControl/Shared/MapProjectionFactory.cs
View file

@ -32,6 +32,10 @@ namespace MapControl
projection = new UpsSouthProjection();
break;
case "AUTO-UTM":
projection = new Wgs84AutoUtmProjection(null); // client-side auto zone
break;
case Wgs84AutoUtmProjection.DefaultCrsId:
projection = new Wgs84AutoUtmProjection();
break;
@ -76,8 +80,8 @@ namespace MapControl
var code when code >= Etrs89UtmProjection.FirstZoneEpsgCode && code <= Etrs89UtmProjection.LastZoneEpsgCode => new Etrs89UtmProjection(epsgCode % 100),
var code when code >= Nad27UtmProjection.FirstZoneEpsgCode && code <= Nad27UtmProjection.LastZoneEpsgCode => new Nad27UtmProjection(epsgCode % 100),
var code when code >= Nad83UtmProjection.FirstZoneEpsgCode && code <= Nad83UtmProjection.LastZoneEpsgCode => new Nad83UtmProjection(epsgCode % 100),
var code when code >= Wgs84UtmProjection.FirstZoneNorthEpsgCode && code <= Wgs84UtmProjection.LastZoneNorthEpsgCode => new Wgs84UtmProjection(epsgCode % 100, true),
var code when code >= Wgs84UtmProjection.FirstZoneSouthEpsgCode && code <= Wgs84UtmProjection.LastZoneSouthEpsgCode => new Wgs84UtmProjection(epsgCode % 100, false),
var code when code >= Wgs84UtmProjection.FirstZoneNorthEpsgCode && code <= Wgs84UtmProjection.LastZoneNorthEpsgCode => new Wgs84UtmProjection(epsgCode % 100, Hemisphere.North),
var code when code >= Wgs84UtmProjection.FirstZoneSouthEpsgCode && code <= Wgs84UtmProjection.LastZoneSouthEpsgCode => new Wgs84UtmProjection(epsgCode % 100, Hemisphere.South),
_ => null
};
}

16
MapControl/Shared/PolarStereographicProjection.cs
View file

@ -24,13 +24,13 @@ namespace MapControl
public double ScaleFactor { get; set; } = 0.994;
public double FalseEasting { get; set; } = 2e6;
public double FalseNorthing { get; set; } = 2e6;
public bool IsNorth { get; set; }
public Hemisphere Hemisphere { get; set; }
public override Point RelativeScale(double latitude, double longitude)
{
latitude *= Math.PI / 180d;
if (!IsNorth)
if (Hemisphere == Hemisphere.South)
{
latitude = -latitude;
}
@ -54,7 +54,7 @@ namespace MapControl
latitude *= Math.PI / 180d;
longitude *= Math.PI / 180d;
if (!IsNorth)
if (Hemisphere == Hemisphere.South)
{
latitude = -latitude;
longitude = -longitude;
@ -71,7 +71,7 @@ namespace MapControl
var x = r * Math.Sin(longitude); // p.161 (21-30)
var y = -r * Math.Cos(longitude); // p.161 (21-31)
if (!IsNorth)
if (Hemisphere == Hemisphere.South)
{
x = -x;
y = -y;
@ -85,7 +85,7 @@ namespace MapControl
x -= FalseEasting;
y -= FalseNorthing;
if (!IsNorth)
if (Hemisphere == Hemisphere.South)
{
x = -x;
y = -y;
@ -99,7 +99,7 @@ namespace MapControl
var lat = WorldMercatorProjection.ApproximateLatitude(e, t); // p.162 (3-5)
var lon = Math.Atan2(x, -y); // p.162 (20-16)
if (!IsNorth)
if (Hemisphere == Hemisphere.South)
{
lat = -lat;
lon = -lon;
@ -125,7 +125,7 @@ namespace MapControl
public UpsNorthProjection(string crsId)
{
CrsId = crsId;
IsNorth = true;
Hemisphere = Hemisphere.North;
}
}
@ -145,7 +145,7 @@ namespace MapControl
public UpsSouthProjection(string crsId)
{
CrsId = crsId;
IsNorth = false;
Hemisphere = Hemisphere.South;
}
}
}

16
MapControl/Shared/Wgs84AutoUtmProjection.cs
View file

@ -3,8 +3,9 @@
namespace MapControl
{
/// <summary>
/// WGS84 Universal Transverse Mercator Projection with
/// automatic zone selection from projection center.
/// WGS84 Universal Transverse Mercator Projection with automatic zone selection from
/// the projection center. If the CRS Id passed to the constructor is null or empty,
/// appropriate CRS Ids EPSG:32601 to EPSG:32660 and EPSG:32701 to EPSG:32760 are used.
/// </summary>
public class Wgs84AutoUtmProjection : Wgs84UtmProjection
{
@ -18,11 +19,8 @@ namespace MapControl
// XAML needs parameterless constructor
}
/// <summary>
/// When the crsId parameter is null or empty, the projection will use EPSG:32***.
/// </summary>
public Wgs84AutoUtmProjection(string crsId)
: base(31, true)
: base(31, Hemisphere.North)
{
autoCrsId = crsId;
@ -43,11 +41,11 @@ namespace MapControl
var lon = Location.NormalizeLongitude(value.Longitude);
var zone = (int)Math.Floor(lon / 6d) + 31;
var north = value.Latitude >= 0d;
var hemisphere = value.Latitude >= 0d ? Hemisphere.North : Hemisphere.South;
if (Zone != zone || IsNorth != north)
if (Zone != zone || Hemisphere != hemisphere)
{
SetZone(zone, north);
SetZone(zone, hemisphere);
if (!string.IsNullOrEmpty(autoCrsId))
{

20
MapControl/Shared/Wgs84UtmProjection.cs
View file

@ -2,6 +2,12 @@
namespace MapControl
{
public enum Hemisphere
{
North,
South
}
/// <summary>
/// WGS84 Universal Transverse Mercator Projection.
/// </summary>
@ -15,11 +21,11 @@ namespace MapControl
public const int LastZoneSouthEpsgCode = 32700 + LastZone;
public int Zone { get; private set; }
public bool IsNorth { get; private set; }
public Hemisphere Hemisphere { get; private set; }
public Wgs84UtmProjection(int zone, bool north)
public Wgs84UtmProjection(int zone, Hemisphere hemisphere)
{
SetZone(zone, north);
SetZone(zone, hemisphere);
EquatorialRadius = Wgs84EquatorialRadius;
Flattening = Wgs84Flattening;
@ -27,7 +33,7 @@ namespace MapControl
FalseEasting = 5e5;
}
protected void SetZone(int zone, bool north)
protected void SetZone(int zone, Hemisphere hemisphere)
{
if (zone < FirstZone || zone > LastZone)
{
@ -35,10 +41,10 @@ namespace MapControl
}
Zone = zone;
IsNorth = north;
CrsId = $"EPSG:{(north ? 32600 : 32700) + zone}";
Hemisphere = hemisphere;
CrsId = $"EPSG:{(hemisphere == Hemisphere.North ? 32600 : 32700) + zone}";
CentralMeridian = zone * 6d - 183d;
FalseNorthing = north ? 0d : 1e7;
FalseNorthing = hemisphere == Hemisphere.North ? 0d : 1e7;
}
}
}

16
MapProjections/Shared/Wgs84AutoUtmProjection.cs
View file

@ -3,8 +3,9 @@
namespace MapControl.Projections
{
/// <summary>
/// WGS84 Universal Transverse Mercator Projection with
/// automatic zone selection from projection center.
/// WGS84 Universal Transverse Mercator Projection with automatic zone selection from
/// the projection center. If the CRS Id passed to the constructor is null or empty,
/// appropriate CRS Ids EPSG:32601 to EPSG:32660 and EPSG:32701 to EPSG:32760 are used.
/// </summary>
public class Wgs84AutoUtmProjection : Wgs84UtmProjection
{
@ -16,11 +17,8 @@ namespace MapControl.Projections
// XAML needs parameterless constructor
}
/// <summary>
/// When the crsId parameter is null or empty, the projection will use EPSG:32***.
/// </summary>
public Wgs84AutoUtmProjection(string crsId)
: base(31, true)
: base(31, Hemisphere.North)
{
autoCrsId = crsId;
@ -41,11 +39,11 @@ namespace MapControl.Projections
var lon = Location.NormalizeLongitude(value.Longitude);
var zone = (int)Math.Floor(lon / 6d) + 31;
var north = value.Latitude >= 0d;
var hemisphere = value.Latitude >= 0d ? Hemisphere.North : Hemisphere.South;
if (Zone != zone || IsNorth != north)
if (Zone != zone || Hemisphere != hemisphere)
{
SetZone(zone, north);
SetZone(zone, hemisphere);
if (!string.IsNullOrEmpty(autoCrsId))
{

12
MapProjections/Shared/Wgs84UtmProjection.cs
View file

@ -16,14 +16,14 @@ namespace MapControl.Projections
public const int LastZoneSouthEpsgCode = 32700 + LastZone;
public int Zone { get; private set; }
public bool IsNorth { get; private set; }
public Hemisphere Hemisphere { get; private set; }
public Wgs84UtmProjection(int zone, bool north)
public Wgs84UtmProjection(int zone, Hemisphere hemisphere)
{
SetZone(zone, north);
SetZone(zone, hemisphere);
}
protected void SetZone(int zone, bool north)
protected void SetZone(int zone, Hemisphere hemisphere)
{
if (zone < FirstZone || zone > LastZone)
{
@ -31,8 +31,8 @@ namespace MapControl.Projections
}
Zone = zone;
IsNorth = north;
CoordinateSystem = ProjectedCoordinateSystem.WGS84_UTM(Zone, IsNorth);
Hemisphere = hemisphere;
CoordinateSystem = ProjectedCoordinateSystem.WGS84_UTM(Zone, hemisphere == Hemisphere.North);
}
}
}