Project
Project a point to another spatial reference.
Use case
Being able to project between spatial references is fundamental to a GIS. An example of when you would need to re-project data is if you had data in two different spatial references, but wanted to perform an intersect analysis with the class AGSGeometryEngine.intersection(ofGeometry1:geometry2:)
method. This method takes two geometries as parameters, and both geometries must be in the same spatial reference. If they are not, you could first use class AGSGeometryEngine.projectGeometry(_:to:)
to convert the geometries so they match.
How to use the sample
Tap anywhere on the map. A callout will display the tapped location's coordinate in the original (basemap's) spatial reference webMercator
and in the projected spatial reference wgs84
.
How it works
- Call the static method,
class AGSGeometryEngine.projectGeometry(_:to:)
passing in the original geometry and a spatial reference to which it should be projected.
Relevant API
- AGSGeometryEngine
- AGSPoint
- AGSSpatialReference
Additional information
In cases where the the output spatial reference uses a different geographic coordinate system than that of the input spatial reference, see the class AGSGeometryEngine.projectGeometry(_:to:datumTransformation:)
method that additionally takes in an AGSDatumTransformation
parameter.
Tags
coordinate system, coordinates, latitude, longitude, projected, projection, spatial reference, Web Mercator, WGS 84