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Project a point from one spatial reference to another.

screenshot

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 GeometryEngine::intersect function. This function takes two geometries as parameters, and both geometries must be in the same spatial reference. If they are not, you could first use GeometryEngine::project to convert the geometries so they match.

How to use the sample

Click anywhere on the map. A callout will display the clicked location's coordinate in the original (basemap's) spatial reference and in the projected spatial reference.

How it works

  1. Call the static method, GeometryEngine::project, passing in the original Geometry and a SpatialReference to which it should be projected.

Relevant API

  • GeometryEngine
  • Point
  • SpatialReference

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 GeometryEngine.project method that additionally takes in a DatumTransformation parameter.

Tags

coordinate system, coordinates, latitude, longitude, projected, projection, spatial reference, Web Mercator, WGS 84

Sample Code

ProjectGeometry.qmlProjectGeometry.cppProjectGeometry.h
                                             
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// [WriteFile Name=ProjectGeometry, Category=Geometry]
// [Legal]
// Copyright 2018 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.
// [Legal]

import QtQuick 2.6
import QtQuick.Window 2.3
import QtQuick.Controls 2.2
import Esri.Samples 1.0
import Esri.ArcGISRuntime.Toolkit 100.12

ProjectGeometrySample {
    id: rootRectangle
    clip: true
    width: 800
    height: 600

    // add a mapView component
    MapView {
        id: mapView
        anchors.fill: parent
        objectName: "mapView"

        // Declare a callout
        Callout {
            id: callout
            calloutData: mapView.calloutData
            accessoryButtonHidden: true
            autoAdjustWidth: true
            maxWidth: 350
            leaderPosition: leaderPositionEnum.Automatic
        }
    }
}

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