PositioningSDK - Getting started

Installation

Before you start developing your application with WemapSDKs, you need to configure your credentials and add the SDK as a dependency.

info

The code examples below demonstrate how to configure the WemapPositioningSDK to work as a standalone solution outside of the Wemap Map & AR ecosystem (i.e., with another Map/AR SDK). However, it can also be used in combination with the WemapMapSDK or WemapGeoARSDK. Instructions are available here.

Adding the Dependency

To add WemapSDKs to your app:

1. Add Dependencies in the Podfile

   Add the required WemapSDK pods to your app:

   use_frameworks!
   
   target 'TargetNameOfYourApp' do
       # Add the dependency for the WemapPositioningSDK library
       pod 'WemapPositioningSDK/VPSARKit', '<version>' # Wemap VPS ARKit Location Source
       pod 'WemapPositioningSDK/GPS', '<version>' # GPS Location Source
       pod 'WemapPositioningSDKPolestar', '<version>' # Polestar Location Source
   end

2. Ensure Minimum iOS Version

   Your project must target iOS 12.0 or later:

   platform :ios, '12.0'

3. Install Dependencies and Open the Project

   Run the following command to install the pods:

   AWS_ACCESS_KEY_ID=*** \
   AWS_SECRET_ACCESS_KEY=*** \
   AWS_REGION=*** \
   bundle exec pod install --repo-update

   Then, open your project in Xcode:

   open your-project.xcworkspace

Location Sources

Wemap provides various location sources to track the user's location on the map.

To use any Location Source, you must have a mapID and token. For more details, please contact the Wemap team.

To set a specific location source, follow these steps:

• Add the relevant WemapPositioningSDK library to your project dependencies.
• Fetch MapData using your mapID and token.
• Create a LocationSource using MapData.
• Assign location source delegates to listen for location updates.

Wemap VPS ARKit Location Source

Fetching MapData

ServiceFactory
    .getMapService()
    .map(byID: 19158, token: "GUHTU6TYAWWQHUSR5Z5JZNMXX")
    .observe(on: MainScheduler.asyncInstance)
    .subscribe(onSuccess: { mapData in
        setupLocationSource(mapData: mapData)
    }, onFailure: {
        debugPrint("Failed to get map data with error - \($0)")
    })
    .disposed(by: disposeBag)

Setting Up the VPS ARKit Location Source

Once you have the MapData, create a VPSARKitLocationSource instance, assign delegates, and start it:

func setupLocationSource(mapData: MapData) {
    vpsLocationSource = VPSARKitLocationSource(mapData: mapData)
    vpsLocationSource.delegate = self
    vpsLocationSource.vpsDelegate = self
    
    vpsLocationSource.start()
}

Handling Location Source State Changes

You must handle state changes in VPSARKitLocationSourceDelegate, as users may need to scan their environment.

extension VPSViewController: VPSARKitLocationSourceDelegate {
    
    func locationSource(_ locationSource: VPSARKitLocationSource, didChangeState state: VPSARKitLocationSource.State) {
        // Handle state changes
    }
    
    func locationSource(_ locationSource: VPSARKitLocationSource, didChangeScanStatus status: VPSARKitLocationSource.ScanStatus) {
        // Handle scan status changes
    }
}

Retrieving User's Coordinate and Attitude

To get the user’s coordinate and attitude, implement LocationSourceDelegate:

extension VPSViewController: LocationSourceDelegate {
    
    func locationSource(_ locationSource: any LocationSource, didUpdateCoordinate coordinate: Coordinate) {
        // Pass the updated coordinate to your map implementation
    }
    
    func locationSource(_ locationSource: any LocationSource, didUpdateAttitude attitude: Attitude) {
        // Pass the updated attitude to your map implementation
    }
    
    func locationSource(_ locationSource: any LocationSource, didFailWithError error: any Error) {
        // Handle errors
    }
}

Scanning the Environment

To start tracking the user's location, allow them to scan their environment:

func startScan() {
    vpsLocationSource.startScan()
}

Once the system successfully recognizes the user's location, it will report the accuratePositioning state to VPSARKitLocationSourceDelegate. Shortly afterward, you will start receiving updated Coordinate and Attitude values in LocationSourceDelegate.

The VPS system will also report:

• notPositioning – indicates that the system hasn't yet recognized the environment and a VPS scan is required. At this point, you should present the camera view to the user to allow them to scan using vpsLocationSource.startScan().
• degradedPositioning – indicates that user location tracking is limited for various reasons (see reasons in the API reference documentation). A scan is recommended, but not mandatory, to restore the accuratePositioning state. We suggest a subtle UI indication when this state occurs, such as a location icon warning or a small toast message prompting the user to rescan.

Assigning an Itinerary

Once you start receiving updated Coordinates, you can assign an itinerary to the VPSARKitLocationSource. Assigning an itinerary to VPSARKitLocationSource when a user is following an A→B itinerary enhances the overall navigation experience (e.g., itinerary projections, conveyor detection, etc.).

For example, when a conveyor is detected, the system will prompt you to rescan the environment to restore tracking.

Below are two examples demonstrating how to obtain an itinerary and assign it to VPSARKitLocationSource.

Itinerary from Wemap API

private func calculateItinerary() {
    let origin = Coordinate(latitude: 48.88007462, longitude: 2.35591097, level: 0)
    let destination = Coordinate(latitude: 48.88141308, longitude: 2.35747255, level: -2)
    
    ServiceFactory
        .getItineraryProvider()
        .itineraries(origin: origin, destination: destination, mapId: mapData!.id)
        .subscribe(onSuccess: { itineraries in
            self.vpsLocationSource.itinerary = itineraries.first
        }, onFailure: { error in
            debugPrint("Failed to calculate itineraries with error: \(error)")
        })
        .disposed(by: disposeBag)
}

Manually created Itinerary

You can create an itinerary by providing the minimum necessary information, as shown below.

An Itinerary consists of an origin, a destination, and a list of segments, where:

• origin is the starting point of the itinerary.
• destination is the ending point of the itinerary.
• segments is a collection of segment objects, where each:
  • segment is a struct with two connected points (p1, p2) along the itinerary, and optionally a levelChange struct that describes the type of level transition.

private func hardcodedItinerary() {
    
    let origin = Coordinate(latitude: 48.88007462, longitude: 2.35591097, level: 0)
    let destination = Coordinate(latitude: 48.88141308, longitude: 2.35747255, level: -2)
    
    let coordinatesLevel0 = [
        [ 2.3559003, 48.88005135 ],
        ...
        [ 2.35657153, 48.88013655 ]
    ].map { Coordinate(latitude: $0[1], longitude: $0[0], level: 0) }
    
    let legSegmentsLevel0 = LegSegment.fromCoordinates(coordinatesLevel0)
    
    let coordinatesFrom0ToMinus1 = [
        [ 2.35657153, 48.88013655 ],
        [ 2.3567008, 48.8801748 ]
    ].map { Coordinate(latitude: $0[1], longitude: $0[0], levels: [-1, 0]) }
    
    let levelChangeFrom0ToMinus1 = LevelChange(difference: -1, direction: .down, type: .escalator)
    let legSegmentsFrom0ToMinus1 = LegSegment.fromCoordinates(coordinatesFrom0ToMinus1, levelChange: levelChangeFrom0ToMinus1)
    
    let coordinatesLevelMinus1 = [
        [ 2.3567008, 48.8801748 ],
        ...
        [ 2.357253, 48.88061996 ]
    ].map { Coordinate(latitude: $0[1], longitude: $0[0], level: -1) }
    
    let legSegmentsLevelMinus1 = LegSegment.fromCoordinates(coordinatesLevelMinus1)
    
    let coordinatesFromMinus1ToMinus2 = [
        [ 2.357253, 48.88061996 ],
        [ 2.35727559, 48.88066565 ]
    ].map { Coordinate(latitude: $0[1], longitude: $0[0], levels: [-2, -1]) }
    
    let levelChangeFromMinus1ToMinus2 = LevelChange(difference: -1, direction: .down, type: .escalator)
    let legSegmentsFromMinus1ToMinus2 = LegSegment.fromCoordinates(coordinatesFromMinus1ToMinus2, levelChange: levelChangeFromMinus1ToMinus2)
    
    let coordinatesLevelMinus2 = [
        [ 2.35727559, 48.88066565 ],
        ...
        [ 2.35748253, 48.88143515 ]
    ].map { Coordinate(latitude: $0[1], longitude: $0[0], level: -2) }
    
    let legSegmentsLevelMinus2 = LegSegment.fromCoordinates(coordinatesLevelMinus2)
    
    let segments = legSegmentsLevel0 + legSegmentsFrom0ToMinus1 + legSegmentsLevelMinus1 + legSegmentsFromMinus1ToMinus2 + legSegmentsLevelMinus2
    vpsLocationSource.itinerary = .init(origin: origin, destination: destination, segments: segments)
}

You can also check out an example of how a sample GeoJSON is transformed into a Wemap Itinerary in our GitHub repository.

Important note

info

Starting from iOS 18, there is a bug where ARSession is automatically stopped by ARView when the view is dismissed or hidden. As a result, the positioning process stops after a few seconds. If you are using ARView, we recommend a workaround in our sample application

GPS Location Source

Once you have the MapData, create a GPSLocationSource instance.

Setting Up the GPS Location Source

func setupLocationSource(mapData: MapData) {
    let source = GPSLocationSource(mapData: mapData)
    source.start()
}

Polestar Location Source

Once you have the MapData, create a PolestarLocationSource instance.

Setting Up the Polestar Location Source

func setupLocationSource(mapData: MapData) {
    let source = PolestarLocationSource(mapData: mapData, apiKey: "emulator") // change 'emulator' to your Polestar API key
    source.start()
}

Examples

For additional examples and sample implementations of WemapSDKs, visit the official GitHub repository.

Clone the repository and follow the README instructions to run the sample application.

🔗 Positioning sample