Rooftop anchors represent a location at a given altitaude, longitude, and an elevation relative to the top of a building. Terrain anchors represent a location at a given latitude, longitude, and an elevation relative to the ground or floor. WGS84 anchors represent a location at a given latitude, longitude, and altitude relative to the WGS84 ellipsoid. There are three types of Geospatial Anchors which can be used to attach content toĪ real-world locations. You can place a Geospatial anchor almost anywhere in the world at a given latitude, longitude and altitude without needing to manually map the space. The Geospatial API provides for an anchor's horizontal (latitude and longitude) and vertical (altitude) positions following the WGS84 specification. However, the image maps created by these APIs are local because they explicitly need to map a space.
When placing anchors, other ARCore APIs such as the ARCore Cloud Anchor API also use image maps to determine a device’s pose. Computer vision algorithms then compute the position and orientation of the device, offering a location that is much more accurate than what was previously possible with GPS alone. When the user’s device makes a request to the Geospatial API, a neural network processes the pixels to find recognizable parts of the user’s environment and matches them to the VPS localization model. This localization model consists of trillions of points and spans nearly all countries, with future coverage. Those parts are then combined across tens of billions of images to compute a 3D point cloud of the global environment. Deep neural networks identify and describe parts of the images that are likely to be recognizable over long periods of time. Street View images from Google Maps, which have been captured around the globe for more than 15 years, are the foundation of VPS. The API also takes care of merging the user’s local coordinates with the geographic coordinates from VPS so that you can work within a single coordinate system. It uses device sensor and GPS data to detect the device's environment, then matches the recognizable parts of that environment to a localization model provided by Google’s Visual Positioning System (VPS) to determine the precise location of a user’s device.
The ARCore Geospatial API enables you to remotely attach content to any area covered by Google Street View and create AR experiences on a global scale. ARCore SDK for Unreal Engine (official documentation).
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