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ARCore Geospatial in this workflow means a Unity application built for Android with AR Foundation and ARCore Extensions. It is not a guide to embedding Unity inside an independently developed Kotlin or Java app. To use location-anchored AR, configure the Unity AR stack, authorize the ARCore API through Google Cloud, enable Geospatial mode, obtain the required user consent and precise location permission, check device support, then resolve and validate anchors on the handset.
What you need before enabling Geospatial
A Unity AR Foundation project
Start with a Unity project configured for AR Foundation and its ARCore provider, then add ARCore Extensions for AR Foundation. Google’s setup guidance assumes familiarity with AR concepts and configuring an AR session. In an existing app, first confirm that its AR session and camera work before adding location-anchored content.
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A Google Cloud project
Enable the ARCore API in a new or existing Google Cloud project. The API is used to host, store, and resolve Geospatial anchors. Google prefers keyless authorization and also supports API-key authorization; choose the method that fits the app’s deployment and current Cloud configuration. Do not commit authorization credentials to source control.
Google’s setup pages do not establish a complete tested compatibility matrix for Unity Editor, AR Foundation, the ARCore XR Plug-in, ARCore Extensions, Android Gradle Plugin, and target SDK. Verify the versions as a combination for your project rather than assuming that one documented version covers the entire stack.
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Enable Geospatial in Unity and the session
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In Unity, open Edit > Project Settings > XR Plug-in Management > ARCore Extensions. Under Optional Features, enable Geospatial.
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Create an
ARCoreExtensionsConfigasset from Assets > Create > XR > ARCore Extensions Config. -
Set the asset’s Geospatial Mode to Enabled, then assign the config to the ARCore Extensions GameObject in the scene.
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Enabling the optional feature and setting the session configuration are both required; enabling only one does not complete the setup.
Get consent, location permission, and device support right
Explain device-data use and request precise location
Show the required user prompt acknowledging and allowing device-data use, and obtain precise location permission. When Geospatial mode is enabled, ARCore Extensions requests location permission through ARCoreExtensions.Update(). If the user does not grant precise location, the session cannot resume and can terminate with a “permission not granted” error. Explain the consequence in the app’s permission flow and provide a clear way to retry: after denial, restarting the app is required for the permission request to be triggered again.
Check Geospatial capability before configuring the session
General ARCore support does not guarantee Geospatial support on a particular Android device. Before configuring the session for Geospatial, call AREarthManager.IsGeospatialModeSupported(). If the result is FeatureSupported.Unsupported, do not attempt to enable Geospatial mode; show an appropriate fallback or explain that the feature is unavailable on that handset.
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Assess coverage and wait for a useful pose
Geospatial combines GPS and Visual Positioning System (VPS) data. Google describes VPS as complementary to GPS: it can help in places such as indoors or dense urban areas where GPS accuracy may be low, while outdoor GPS may be adequate where VPS is unavailable. Query AREarthManager.CheckVpsAvailability() for VPS availability at the user’s location, and make the experience’s behavior depend on the result rather than assuming coverage everywhere.
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Choose the anchor altitude model that matches the content
Google documents three anchor types. The key decision is the height reference: WGS84 uses an ellipsoid altitude supplied by the app, while Terrain and Rooftop use Google location data and resolve asynchronously.
| Anchor type | Altitude reference and input | Resolution and suitable use |
|---|---|---|
| WGS84 | The app supplies latitude, longitude, and altitude in meters above the WGS84 ellipsoid, plus rotation. | Use ARAnchorManagerExtensions.AddAnchor() while Earth tracking is active. Suitable when the app has a correctly converted absolute altitude and needs explicit height control. |
| Terrain | The app supplies latitude, longitude, and altitude above terrain. | Use ResolveAnchorOnTerrainAsync() and inspect the promise or result state before attaching content. Suitable for ground-relative placements. |
| Rooftop | The app supplies latitude, longitude, and altitude above a rooftop. | Use ResolveAnchorOnRooftopAsync() and handle resolution states. Suitable for roof-relative placements; if the location is not on a building, the API falls back to terrain altitude. |
Google recommends Terrain or Rooftop when those height references fit the experience because their heights are determined using Google Maps data. WGS84 altitude is not the same as a map’s ground elevation, so do not assume that ellipsoid altitude zero corresponds to local ground. For content that must attach to a building itself, Google recommends a hit-test with Streetscape Geometry rather than treating a rooftop anchor as a building-surface attachment.
Resolve anchors at runtime
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Wait until the AR session is ready and Earth tracking is active before creating a WGS84 anchor or starting a Terrain or Rooftop resolution.
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Call the API that matches the chosen height model:
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For Terrain and Rooftop, check the asynchronous promise or result state. Attach or reveal dependent content only when resolution has succeeded, and provide a failure or waiting state rather than assuming the anchor exists immediately.
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Use the camera’s geospatial pose accuracy to decide when to reveal content that requires precise placement; avoid making an early, unstable pose look final.
Use Geospatial Creator for placements authored in the editor
Geospatial Creator is an optional editor workflow for locations known in advance. It adds scene placeholders that become runtime Geospatial anchors; it does not replace runtime ARCore setup. The Creator quickstart requires Unity 2021.3 or newer and supports Android or iOS editor targets, not other platforms.
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Enable both Geospatial and Geospatial Creator in ARCore Extensions settings.
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Add Cesium for Unity and configure Google Map Tiles API access to preview the area in the Unity Editor. The Creator quickstart labels Cesium 1.1.0 as its current recommended version; check the live guide and current Cesium releases because that recommendation may change.
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Add exactly one Geospatial Creator Origin to the scene and set its georeference.
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Place Geospatial Creator Anchors with latitude, longitude, and height, then make visible geometry a child of the relevant anchor.
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The map tiles are for editor visualization, while the ARCore Geospatial API is used at runtime. In the quickstart’s ordinary setup, the Cesium map-tileset object is tagged EditorOnly by default, so the preview is not downloaded and rendered at runtime.
Understand Creator height and origin behavior
Creator anchors can use Terrain, Rooftop, or WGS84 height. Terrain and Rooftop heights are determined at runtime; a WGS84 altitude field is used for editor visualization and may need adjustment because tile ground elevation and VPS-reported height can differ by several meters. Keep the origin near the authored placements: Google warns that coordinate-conversion inaccuracies may occur at distances over 20 km and recommends using multiple scenes and origins for long distances. This is a documented warning, not a hard universal boundary.
Choose between editor-authored and runtime-selected anchors
| Approach | Best fit | What the app must handle |
|---|---|---|
| Geospatial Creator placeholders | Placements known ahead of time that benefit from map-tile visualization in the Unity Editor. | Configure the Creator preview and scene origin; at runtime, wait for the session and for each placeholder to create or resolve an ARGeospatialAnchor through ARAnchorManager. |
| Runtime API anchors | Locations selected or generated while the app is running. | Call the appropriate ARAnchorManager method and handle asynchronous result states for Terrain and Rooftop anchors. |
Troubleshoot common Geospatial problems
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Geospatial is unavailable: Check
IsGeospatialModeSupported(). Support for ARCore generally is not enough to establish Geospatial capability. -
The session terminates after a permission denial: The user must grant precise location for the session to resume. Explain why it is needed and restart the app to trigger the permission request again.
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VPS is unavailable: Check
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Anchored content drifts or jumps at startup: Let VPS refine the camera pose and use
CameraGeospatialPoseaccuracy to gate or adapt rendering. -
Content appears at the wrong height: Confirm whether the supplied value is WGS84 ellipsoid altitude, height above terrain, or height above rooftop. Also account for the possible several-meter difference between editor tile elevation and VPS-reported height in Creator placements.
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The camera view is black with URP: Google’s Creator quickstart says the AR Background Renderer Feature may need to be added to each URP Renderer.
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Editor map tiles appear magenta: The quickstart recommends installing Shader Graph when Cesium tiles load magenta, particularly with the built-in renderer.
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Far-away Creator placements are inaccurate: Keep placements close to the scene’s georeference origin; for long distances, use multiple scenes and origins.
Validate on the target handset
Run the finished app on the specific Android device you intend to support. Confirm Geospatial capability, the consent and precise-location permission path, VPS availability at the test location, and anchor resolution behavior. Test the chosen altitude model on the actual surface and observe pose accuracy before judging placement. A handset category alone cannot establish support; verify the exact device.
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