set-up-coarse-reloc-cpp-winrt.md

title	description	author	manager	services	ms.author	ms.date	ms.topic	ms.service
Coarse relocalization in C++/WinRT	In-depth explanation of how to create and locate anchors using coarse relocalization in C++/WinRT.	pamistel	MehranAzimi-msft	azure-spatial-anchors	pamistel	11/20/2020	tutorial	azure-spatial-anchors

How to create and locate anchors using coarse relocalization in C++/WinRT

[!div class="op_single_selector"]

• Unity
• Objective-C
• Swift
• Android Java
• C++/NDK
• C++/WinRT

Azure Spatial Anchors can associate on-device, positioning sensor data with the anchors you create. This data can also be used to quickly determine whether there are any anchors nearby your device. For more information, see Coarse relocalization.

Prerequisites

To complete this guide, make sure you have:

• Basic knowledge on C++ and the Windows Runtime APIs.
• Read through the Azure Spatial Anchors overview.
• Completed one of the 5-minute Quickstarts.
• Read through the Create and locate anchors how-to.

[!INCLUDE Configure Provider]

// Create the sensor fingerprint provider
PlatformLocationProvider sensorProvider = PlatformLocationProvider();

// Allow GPS
SensorCapabilities sensors = sensorProvider.Sensors()
sensors.GeoLocationEnabled(true);

// Allow WiFi scanning
sensors.WifiEnabled(true);

// Populate the set of known BLE beacons' UUIDs
std::vector<winrt::hstring> uuids;
uuids.emplace_back("22e38f1a-c1b3-452b-b5ce-fdb0f39535c1");
uuids.emplace_back("a63819b9-8b7b-436d-88ec-ea5d8db2acb0");

// Allow the set of known BLE beacons
sensors.BluetoothEnabled(true);
sensors.KnownBeaconProximityUuids(uuids);

[!INCLUDE Configure Provider]

// Set the session's sensor fingerprint provider
cloudSpatialAnchorSession.LocationProvider(sensorProvider);

// Configure the near-device criteria
NearDeviceCriteria nearDeviceCriteria = NearDeviceCriteria();
nearDeviceCriteria.DistanceInMeters(5.0f);
nearDeviceCriteria.MaxResultCount(25);

// Set the session's locate criteria
anchorLocateCriteria = AnchorLocateCriteria();
anchorLocateCriteria.NearDevice(nearDeviceCriteria);
cloudSpatialAnchorSession.CreateWatcher(anchorLocateCriteria);

[!INCLUDE Locate]

[!INCLUDE Configure Provider]