أنظمة المرجع المكاني
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إنشاء أنظمة المرجع المكاني
إنشاء نظام مرجعي مكاني باستخدام معرف EPSG (SRID)
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// For complete examples and data files, please go to https://github.com/aspose-gis/Aspose.GIS-for-.NET | |
var srs = SpatialReferenceSystem.CreateFromEpsg(26918); | |
Console.WriteLine("SRS Name: {0}", srs.Name); // NAD83 / UTM zone 18N | |
Console.WriteLine("SRS EPSG code: {0}", srs.EpsgCode); // 26918 | |
Console.WriteLine("Datum name: {0}", srs.GeographicDatum.Name); // North_American_Datum_1983 | |
Console.WriteLine("Datum EPSG code: {0}", srs.GeographicDatum.EpsgCode); // 6269 | |
Console.WriteLine("Ellipsoid name: {0}", srs.GeographicDatum.Ellipsoid.Name); // GRS 1980 | |
Console.WriteLine("Ellipsoid EPSG code: {0}", srs.GeographicDatum.EpsgCode); // 6269 | |
Console.WriteLine("Type: {0}", srs.Type); // Projected | |
Console.WriteLine("Dimensions count: {0}", srs.DimensionsCount); // 2 | |
Console.WriteLine("First dimension name: {0}", srs.GetAxis(0).Name); // X | |
Console.WriteLine("First dimension direction: {0}", srs.GetAxis(0).Direction); // East | |
Console.WriteLine("Second dimension name: {0}", srs.GetAxis(1).Name); // Y | |
Console.WriteLine("Second dimension direction: {0}", srs.GetAxis(1).Direction); // North | |
Console.WriteLine("First dimension unit: {0}, {1}", srs.GetUnit(0).Name, srs.GetUnit(0).Factor); // metre, 1 | |
Console.WriteLine("Second dimension unit: {0}, {1}", srs.GetUnit(1).Name, srs.GetUnit(1).Factor); // metre, 1 |
إنشاء نظام مرجعي مكاني من WKT (نص معروف)
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// For complete examples and data files, please go to https://github.com/aspose-gis/Aspose.GIS-for-.NET | |
string wkt = @" | |
GEOGCS[""WGS 84"", | |
DATUM[""WGS_1984"", | |
SPHEROID[""WGS 84"",6378137,298.257223563, | |
AUTHORITY[""EPSG"",""7030""]], | |
AUTHORITY[""EPSG"",""6326""]], | |
PRIMEM[""Greenwich"",0, | |
AUTHORITY[""EPSG"",""8901""]], | |
UNIT[""degree"",0.01745329251994328, | |
AUTHORITY[""EPSG"",""9122""]], | |
AUTHORITY[""EPSG"",""4326""]] | |
"; | |
var srs = SpatialReferenceSystem.CreateFromWkt(wkt); | |
Console.WriteLine("SRS Name: {0}", srs.Name); // WGS 84 | |
Console.WriteLine("SRS EPSG code: {0}", srs.EpsgCode); // 4326 | |
Console.WriteLine("Datum name: {0}", srs.GeographicDatum.Name); // WGS_1984 | |
Console.WriteLine("Datum EPSG code: {0}", srs.GeographicDatum.EpsgCode); // 6326 | |
Console.WriteLine("Ellipsoid name: {0}", srs.GeographicDatum.Ellipsoid.Name); // WGS 84 | |
Console.WriteLine("Ellipsoid EPSG code: {0}", srs.GeographicDatum.EpsgCode); // 7030 | |
Console.WriteLine("Type: {0}", srs.Type); // Geographic | |
Console.WriteLine("Dimensions count: {0}", srs.DimensionsCount); // 2 | |
Console.WriteLine("First dimension name: {0}", srs.GetAxis(0).Name); // Longitude | |
Console.WriteLine("First dimension direction: {0}", srs.GetAxis(0).Direction); // EAST | |
Console.WriteLine("Second dimension name: {0}", srs.GetAxis(1).Name); // Latitude | |
Console.WriteLine("Second dimension direction: {0}", srs.GetAxis(1).Direction); // NORTH | |
Console.WriteLine("First dimension unit: {0}, {1}", srs.GetUnit(0).Name, srs.GetUnit(0).Factor); // degree, 0.01745... | |
Console.WriteLine("Second dimension unit: {0}, {1}", srs.GetUnit(1).Name, srs.GetUnit(1).Factor); // degree, 0.01745... | |
var geogSrs = srs.AsGeographic; | |
Console.WriteLine("Angular unit: {0}, {1}", geogSrs.AngularUnit.Name, geogSrs.AngularUnit.Factor); // degree, 0.01745... | |
Console.WriteLine("Prime meridian: {0}, {1}", geogSrs.PrimeMeridian.Name, geogSrs.PrimeMeridian.Longitude); // Greenwich, 0 |
إنشاء نظام مرجعي مكاني بمعلمات مخصصة
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// For complete examples and data files, please go to https://github.com/aspose-gis/Aspose.GIS-for-.NET | |
var parameters = new ProjectedSpatialReferenceSystemParameters | |
{ | |
Name = "WGS 84 / World Mercator", | |
Base = SpatialReferenceSystem.Wgs84, | |
ProjectionMethodName = "Mercator_1SP", | |
LinearUnit = Unit.Meter, | |
XAxis = new Axis("Easting", AxisDirection.East), | |
YAxis = new Axis("Northing", AxisDirection.North), | |
AxisesOrder = ProjectedAxisesOrder.XY, | |
}; | |
parameters.AddProjectionParameter("central_meridian", 0); | |
parameters.AddProjectionParameter("scale_factor", 1); | |
parameters.AddProjectionParameter("false_easting", 100); | |
parameters.AddProjectionParameter("false_northing", 100); | |
var projectedSrs = SpatialReferenceSystem.CreateProjected(parameters, Identifier.Epsg(3395)); |
العمل مع أنظمة المرجع المكاني
التحقق من دعم التشغيل لنظام مرجعي مكاني
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// For complete examples and data files, please go to https://github.com/aspose-gis/Aspose.GIS-for-.NET | |
Drivers.Shapefile.SupportsSpatialReferenceSystem(SpatialReferenceSystem.Wgs72); // true | |
Drivers.GeoJson.SupportsSpatialReferenceSystem(SpatialReferenceSystem.Wgs84); // true | |
Drivers.GeoJson.SupportsSpatialReferenceSystem(SpatialReferenceSystem.Wgs72); // false |
تصدير نظام المرجع المكاني إلى WKT
النص المعروف (WKT) هو لغة ترميز نصية لتمثيل كائنات الهندسة الناقلة على خريطة، وأنظمة المراجع المكانية لكائنات المكانية والتحويلات بين أنظمة المرجع المكانية. تتيح لك واجهة برمجة التطبيقات Aspose.GIS إنشاء نظام مرجعي مكاني من WKT كما هو موضح في الكود المثالي التالي.
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// For complete examples and data files, please go to https://github.com/aspose-gis/Aspose.GIS-for-.NET | |
var parameters = new ProjectedSpatialReferenceSystemParameters | |
{ | |
Name = "WGS 84 / World Mercator", | |
Base = SpatialReferenceSystem.Wgs84, | |
ProjectionMethodName = "Mercator_1SP", | |
LinearUnit = Unit.Meter, | |
XAxis = new Axis("Easting", AxisDirection.East), | |
YAxis = new Axis("Northing", AxisDirection.North), | |
AxisesOrder = ProjectedAxisesOrder.XY, | |
}; | |
parameters.AddProjectionParameter("central_meridian", 0); | |
parameters.AddProjectionParameter("scale_factor", 1); | |
parameters.AddProjectionParameter("false_easting", 0); | |
parameters.AddProjectionParameter("false_northing", 0); | |
var projectedSrs = SpatialReferenceSystem.CreateProjected(parameters, Identifier.Epsg(3395)); | |
string wkt = projectedSrs.ExportToWkt(); | |
Console.WriteLine(wkt); |
مقارنة أنظمة المرجع المكاني
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// For complete examples and data files, please go to https://github.com/aspose-gis/Aspose.GIS-for-.NET | |
string wkt = @" | |
GEOGCS[""WGS 84"", | |
DATUM[""WGS_1984"", | |
SPHEROID[""WGS 84"",6378137,298.257223563, | |
AUTHORITY[""EPSG"",""7030""]], | |
AUTHORITY[""EPSG"",""6326""]], | |
PRIMEM[""Greenwich"",0, | |
AUTHORITY[""EPSG"",""8901""]], | |
UNIT[""degree"",0.01745329251994328, | |
AUTHORITY[""EPSG"",""9122""]], | |
AUTHORITY[""EPSG"",""4326""]] | |
"; | |
var srs = SpatialReferenceSystem.CreateFromWkt(wkt); | |
srs.IsEquivalent(SpatialReferenceSystem.Wgs84); // true |