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
Sample Code
// Copyright 2019 Esri.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
import UIKit
class ProjectStackView: UIStackView {
@IBOutlet weak var titleLabel: UILabel!
@IBOutlet weak var originalLabel: UILabel!
@IBOutlet weak var projectedLabel: UILabel!
}