## SpatialReferenceSystem class

Spatial reference system maps coordinates to places on Earth. There are different types of SRS, see [`Type`](./type/). What's more, if type of SRS is Geographic or Projected, SRS can be compound or single, see [`IsCompound`](./iscompound/).

```csharp
public abstract class SpatialReferenceSystem : IdentifiableObject
```

## Properties

| Name | Description |
| --- | --- |
| virtual [AsCompound](../../aspose.gis.spatialreferencing/spatialreferencesystem/ascompound/) { get; } | Returns this SRS converted to [`CompoundSpatialReferenceSystem`](../compoundspatialreferencesystem/). Use [`IsCompound`](./iscompound/) to find out if conversion is possible. |
| virtual [AsGeocentric](../../aspose.gis.spatialreferencing/spatialreferencesystem/asgeocentric/) { get; } | Returns this SRS converted to [`GeocentricSpatialReferenceSystem`](../geocentricspatialreferencesystem/). Use [`Type`](./type/) to find out if conversion is possible. |
| virtual [AsGeographic](../../aspose.gis.spatialreferencing/spatialreferencesystem/asgeographic/) { get; } | Returns this SRS converted to [`GeographicSpatialReferenceSystem`](../geographicspatialreferencesystem/). Use [`Type`](./type/) to find out if conversion is possible. |
| virtual [AsLocal](../../aspose.gis.spatialreferencing/spatialreferencesystem/aslocal/) { get; } | Returns this SRS converted to [`LocalSpatialReferenceSystem`](../localspatialreferencesystem/). Use [`Type`](./type/) to find out if conversion is possible. |
| virtual [AsProjected](../../aspose.gis.spatialreferencing/spatialreferencesystem/asprojected/) { get; } | Returns this SRS converted to [`ProjectedSpatialReferenceSystem`](../projectedspatialreferencesystem/). Use [`Type`](./type/) to find out if conversion is possible. |
| virtual [AsVertical](../../aspose.gis.spatialreferencing/spatialreferencesystem/asvertical/) { get; } | Returns this SRS converted to [`VerticalSpatialReferenceSystem`](../verticalspatialreferencesystem/). Use [`Type`](./type/) to find out if conversion is possible. |
| abstract [DimensionsCount](../../aspose.gis.spatialreferencing/spatialreferencesystem/dimensionscount/) { get; } | Returns number of dimensions in this SRS. |
| [EpsgCode](../../aspose.gis.spatialreferencing/identifiableobject/epsgcode/) { get; } | If this objects identifier is EPSG identifier - return its code. Otherwise - return -1. |
| abstract [GeographicDatum](../../aspose.gis.spatialreferencing/spatialreferencesystem/geographicdatum/) { get; } | Returns geographic datum of this SRS. |
| abstract [HasGeographicDatum](../../aspose.gis.spatialreferencing/spatialreferencesystem/hasgeographicdatum/) { get; } | Determines whether this SRS has geographic datum. This is true for every geographic, projected and geocentric SRS. |
| abstract [HasPrimeMeridian](../../aspose.gis.spatialreferencing/spatialreferencesystem/hasprimemeridian/) { get; } | Returns whether this SRS has prime meridian. This is true for every geographic, projected and geocentric SRS. |
| [Identifier](../../aspose.gis.spatialreferencing/identifiableobject/identifier/) { get; } | Identifier of this identifiable object. |
| virtual [IsCompound](../../aspose.gis.spatialreferencing/spatialreferencesystem/iscompound/) { get; } | Returns whether this SRS is compound (a union of two SRS). Following combinations of SRS in compound SRS are considered valid: Geographic SRS + Vertical SRS, in this case type of compound SRS will be Geographic. Projected SRS + Vertical SRS, in this case type of compound SRS will be Projected. If combination of SRSs differs, type of compound SRS will be Unknown. |
| [IsSingle](../../aspose.gis.spatialreferencing/spatialreferencesystem/issingle/) { get; } | Returns whether this SRS is single (not a union of two SRS). |
| [IsValid](../../aspose.gis.spatialreferencing/spatialreferencesystem/isvalid/) { get; } | Same as [`Validate`](./validate/), but don't return error message. |
| [Name](../../aspose.gis.spatialreferencing/identifiableobject/name/) { get; } | Name of this object. |
| abstract [PrimeMeridian](../../aspose.gis.spatialreferencing/spatialreferencesystem/primemeridian/) { get; } | Returns prime meridian of this SRS. |
| abstract [Type](../../aspose.gis.spatialreferencing/spatialreferencesystem/type/) { get; } | Gets type of this SRS, see [`SpatialReferenceSystemType`](../spatialreferencesystemtype/). |
| static [Etrs89](../../aspose.gis.spatialreferencing/spatialreferencesystem/etrs89/) { get; } | ETRS 89 (EPSG:4258) spatial reference system. |
| static [Etrs89LambertAzimuthalEqualArea](../../aspose.gis.spatialreferencing/spatialreferencesystem/etrs89lambertazimuthalequalarea/) { get; } | ETRS 89 / ETRS Lambert Azimuthal Equal Area (EPSG:3035) spatial reference system. |
| static [Etrs89LambertConformalConic](../../aspose.gis.spatialreferencing/spatialreferencesystem/etrs89lambertconformalconic/) { get; } | ETRS 89 / Lambert Conformal Conic (EPSG:3034) spatial reference system. |
| static [Nad83](../../aspose.gis.spatialreferencing/spatialreferencesystem/nad83/) { get; } | NAD 83 (EPSG:4269) spatial reference system. |
| static [Osgb36](../../aspose.gis.spatialreferencing/spatialreferencesystem/osgb36/) { get; } | OSGB 36 (EPSG:4277) spatial reference system. |
| static [Osgb36BritishNationalGrid](../../aspose.gis.spatialreferencing/spatialreferencesystem/osgb36britishnationalgrid/) { get; } | OSGB 36 / British National Grid (EPSG:27700) spatial reference system. |
| static [WebMercator](../../aspose.gis.spatialreferencing/spatialreferencesystem/webmercator/) { get; } | Web Mercator (EPSG:3857) spatial reference system. |
| static [Wgs72](../../aspose.gis.spatialreferencing/spatialreferencesystem/wgs72/) { get; } | WGS 72 (EPSG:4322) spatial reference system. |
| static [Wgs84](../../aspose.gis.spatialreferencing/spatialreferencesystem/wgs84/) { get; } | WGS 84 (EPSG:4326) spatial reference system. |

## Methods

| Name | Description |
| --- | --- |
| static [CreateFromEpsg](../../aspose.gis.spatialreferencing/spatialreferencesystem/createfromepsg/)(int) | Create a spatial reference system based the specified EPSG code. |
| static [CreateFromWkt](../../aspose.gis.spatialreferencing/spatialreferencesystem/createfromwkt/)(string) | Creates a new `SpatialReferenceSystem` based on WKT (Well-Known Text) string. |
| [CreateTransformationTo](../../aspose.gis.spatialreferencing/spatialreferencesystem/createtransformationto/)(SpatialReferenceSystem) | Creates transformation from this `SpatialReferenceSystem` to another `SpatialReferenceSystem`. |
| [ExportToWkt](../../aspose.gis.spatialreferencing/spatialreferencesystem/exporttowkt/)() | Returns representation of this SRS as WKT string. The result WKT string will match OGC 01-009 specification, usually named "WKT1". |
| abstract [GetAxis](../../aspose.gis.spatialreferencing/spatialreferencesystem/getaxis/)(int) | Get [`Axis`](../axis/) that describes dimension. |
| abstract [GetUnit](../../aspose.gis.spatialreferencing/spatialreferencesystem/getunit/)(int) | Get [`Unit`](../unit/) of dimension. |
| virtual [IsEquivalent](../../aspose.gis.spatialreferencing/spatialreferencesystem/isequivalent/)(SpatialReferenceSystem) | Detects whether this SRS is equivalent to other SRS. . |
| override [ToString](../../aspose.gis.spatialreferencing/identifiableobject/tostring/)() | Returns a string that represents the current object. |
| [TryCreateTransformationTo](../../aspose.gis.spatialreferencing/spatialreferencesystem/trycreatetransformationto/)(SpatialReferenceSystem, out SpatialReferenceSystemTransformation) | Creates transformation from this `SpatialReferenceSystem` to another `SpatialReferenceSystem`. |
| abstract [Validate](../../aspose.gis.spatialreferencing/spatialreferencesystem/validate/)(out string) | Determine if this SRS is valid. |
| static [CreateCompound](../../aspose.gis.spatialreferencing/spatialreferencesystem/createcompound/)(string, SpatialReferenceSystem, SpatialReferenceSystem, Identifier) | Create compound SRS. |
| static [CreateGeocentric](../../aspose.gis.spatialreferencing/spatialreferencesystem/creategeocentric/)(GeocentricSpatialReferenceSystemParameters, Identifier) | Create geocentric SRS from custom parameters. |
| static [CreateGeographic](../../aspose.gis.spatialreferencing/spatialreferencesystem/creategeographic/)(GeographicSpatialReferenceSystemParameters, Identifier) | Create geographic SRS from custom parameters. |
| static [CreateLocal](../../aspose.gis.spatialreferencing/spatialreferencesystem/createlocal/)(string, LocalDatum, Unit, ICollection<Axis>, Identifier) | Create local Spatial Reference System. |
| static [CreateProjected](../../aspose.gis.spatialreferencing/spatialreferencesystem/createprojected/)(ProjectedSpatialReferenceSystemParameters, Identifier) | Create projected SRS from custom parameters. |
| static [CreateVertical](../../aspose.gis.spatialreferencing/spatialreferencesystem/createvertical/)(string, VerticalDatum, Unit, Axis, Identifier) | Create vertical SRS. |
| static [IsEquivalent](../../aspose.gis.spatialreferencing/spatialreferencesystem/isequivalent/)(SpatialReferenceSystem, SpatialReferenceSystem) | Determines if two SRS are equivalent. Same coordinates of equivalent SRS match same place on Earth. Some parameters of equivalent SRS can be different, for example [`Name`](../identifiableobject/name/). |
| static [TryCreateFromEpsg](../../aspose.gis.spatialreferencing/spatialreferencesystem/trycreatefromepsg/)(int, out SpatialReferenceSystem) | Create a spatial reference system based the specified EPSG code. |
| static [TryCreateFromWkt](../../aspose.gis.spatialreferencing/spatialreferencesystem/trycreatefromwkt/)(string, out SpatialReferenceSystem) | Creates a new `SpatialReferenceSystem` based on WKT (Well-Known Text) string. |

### See Also

* class [IdentifiableObject](../identifiableobject/)
* namespace [Aspose.Gis.SpatialReferencing](../../aspose.gis.spatialreferencing/)
* assembly [Aspose.GIS](../../)