SpatialReference class final
The spatial reference specifies how geometry coordinates relate to real-world space.
Instances of this class represent a specific coordinate system identified by a well-known ID (WKID) number or well-known text (WKT) string. There are two broad classes of coordinate systems:
- Geographic coordinate systems use a 3-dimensional spherical surface to define locations on the earth.
- Projected coordinate systems use a flat, 2-dimensional surface. See https://developers.arcgis.com/documentation/spatial-references/ for more information about spatial references.
SpatialReference ensures that you can accurately view, query, and analyze the layers of a GeoModel.
The spatial reference value is available from a map or scene after loading
has completed, and is immutable. If you want to set this value for a new map
or scene, use the ArcGISMap.new or Scene.Scene(SceneViewTilingScheme)
constructors.
- Implemented types
- Mixed in types
Constructors
- SpatialReference({required int wkid, int verticalWkid = 0})
-
Creates a spatial reference based on WKID for the horizontal coordinate
system and vertical coordinate system.
factory
-
SpatialReference.fromJson(Map<
String, dynamic> json) -
factory
- SpatialReference.fromJsonString(String jsonString)
-
factory
- SpatialReference.fromWkText(String wkText)
-
Creates a spatial reference based on well-known text.
factory
Properties
- baseGeographic → SpatialReference?
-
If the given spatial reference is a projected coordinate system, then this
returns the geographic coordinate system of that system.
no setter
- hashCode → int
-
The hash code for this object.
no setteroverride
- hasVertical → bool
-
True if spatial reference has a vertical coordinate system set; false
otherwise.
no setter
- isGeographic → bool
-
True if spatial reference is a Geographic Coordinate System.
no setter
- isPannable → bool
-
True if coordinate system is horizontally pannable.
no setter
- isProjected → bool
-
True if spatial reference is a Projected Coordinate System.
no setter
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
- unit → Unit
-
The unit of measure for the horizontal coordinate system of this spatial
reference.
no setter
- verticalUnit → LinearUnit?
-
The unit of measure for the vertical coordinate system of this spatial
reference.
no setter
- verticalWkid → int
-
The well-known ID for the vertical coordinate system (VCS), or 0 if the
spatial reference has no VCS or has a custom VCS.
no setter
- wkid → int
-
The well-known ID for the horizontal coordinate system, or 0 if the
spatial reference has a custom horizontal coordinate system.
no setter
- wkText → String
-
The well-known text for the horizontal and vertical coordinate system.
no setter
Methods
-
getConvergenceAngle(
{required ArcGISPoint point}) → double - Calculate the grid convergence for a spatial reference at a given point.
-
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a nonexistent method or property is accessed.
inherited
-
toJson(
) → Map< String, dynamic> -
Returns a JSON representation of this Object in the data type used by jsonDecode.
inherited
-
toJsonString(
) → String -
Returns a JSON representation of this Object as a String.
override
-
toString(
) → String -
A string representation of this object.
inherited
Operators
-
operator ==(
Object other) → bool -
The equality operator.
override
Static Properties
- webMercator → SpatialReference
-
The Web Mercator spatial reference.
final
- wgs84 → SpatialReference
-
The WGS84 spatial reference.
final