Accurate GPS location

Unity Engine
1

Hi, I’m building a geolocation based app and I have issues with geolocation. The GPS isn’t really accurate (sometime it is but sometime not) and when a call the web API passing my coordinates, if my location is wrong, result is wrong too.
Do you have an idea in how to get precise location ?
I made a script that seems works. I calculate an average location based on last 10 location results and it is pretty accurate. This is my solution :

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;

public class AccurateGPS : MonoBehaviour {
    public static AccurateGPS instance { get; private set; } // As a Singleton
    public List<float> lastKnownCoordinatesX; // Latitude
    public List<float> lastKnownCoordinatesY; // Longitude
    public Text dbgTxt; // Text to debug position

    private void Awake()
{
if (instance == null)
{
instance = this;
}
if (instance != this)
{
Destroy(gameObject);
}
        InvokeRepeating("ShowAcuratePos", 3, 1); // Show debug text
        InvokeRepeating("GetCurrentPos", 1, 1); // Get position each seconds
}

IEnumerator Start()
{
        // The code in start function come from Unity3d official documentation
        // I just modified it a little
if (!AppManager.instance.CheckInternetConnection())
{
print("No internet connection");
yield break;
}

if (!Input.location.isEnabledByUser)
{
print("You need to activate geolocation");
            yield break;
}

Input.location.Start(.1f,.1f); // Start location service with 0.1m accuracy
int maxWait = 10;
while (Input.location.status == LocationServiceStatus.Initializing && maxWait > 0)
{
yield return new WaitForSeconds(1);
maxWait--;
}

if (maxWait < 1)
{
print("Timed out");
yield break;
}

if (Input.location.status == LocationServiceStatus.Failed)
{
print("Unable to determine device location");
yield break;
}
}

    public float GetAverageX() // Calculate average latitude
    {
        float totalX = 0;
        int cpt = 0;
        foreach(float x in lastKnownCoordinatesX)
        {
            totalX += x;
            cpt++;        
        }
        return totalX / cpt;
    }

    public float GetAverageY() // Calculate average longitude
    {
        float totalY = 0;
        int cpt = 0;
        foreach(float y in lastKnownCoordinatesY)
        {
            totalY += y;
            cpt++;        
        }
        return totalY / cpt;
    }

    void ShowAcuratePos() // Show accurate position in debug ui text and save pos to playerprefs
    {
        dbgTxt.text = "AcuratePos = " + GetAverageY() + "," + GetAverageX();
        PlayerPrefs.SetFloat("longitude", GetAverageY());
PlayerPrefs.SetFloat("latitude", GetAverageX());
    }

    void GetCurrentPos() // Get position and add to lists
    {
        // Latitude
        if(lastKnownCoordinatesX.Count < 10)
        {
            lastKnownCoordinatesX.Add(Input.location.lastData.latitude);
        }
        else // If list contains 10 items
        {
            lastKnownCoordinatesX.RemoveAt(0);
            lastKnownCoordinatesX.Add(Input.location.lastData.latitude);
        }
        // Longitude
        if(lastKnownCoordinatesY.Count < 10)
        {
            lastKnownCoordinatesY.Add(Input.location.lastData.longitude);
        }
        else
        {
            lastKnownCoordinatesY.RemoveAt(0);
            lastKnownCoordinatesY.Add(Input.location.lastData.longitude);
        }
    }

    public void OpenMapsAtAccurateCoord() // I added a button to ui text to open google maps to test and see the result and it's pretty good
    {
        Application.OpenURL("https://www.google.fr/maps/dir//'"+GetAverageX()+","+GetAverageY()+"'");

    }
}

If you have any other solution or idea to improve my code it would be usefull.

2

Hi. Thanks for the code. I’d like to find a solution too. My gps unity app is not accurate at all :frowning: I haven’t tested your code but i don’t think taking the average would make a huge improvement if the location values themselves are unreliable