I'm using Unity3D and I created simple distance, speed and acceleration calculator using latitude and longitude of last position. I'm calculating last distance, speed and acceleration in each GPS update (approximately once per second). But sometimes (2-3 second interval) latitude and longitude values changes rapidly (in clear weather and no obstacles). That's why speed and acceleration values gets unreal results. For example, at stable 40 km/h speed, speed value becomes 60 km/h and returns to 40 km/h within 2-3 second. I'm here to ask how can I avoid this inaccurate and rapid GPS data changes?
I'm using Nexus 5 device
There is my code:
using UnityEngine; using System.Collections; using UnityEngine.UI; using UnityEngine.SceneManagement; public class Manager : MonoBehaviour { public Text longitude, latitude, lonAText, latAText, lonBText, latBText; public Text result, overallResult, speedText, lastTimeText, timerText, accelerationText, speed0Text; float lonA, lonB, latA, latB, overallDistance, lastDistance, timer, lastTime, speed, speed0, acceleration; bool firstTime, allowTimer; public AudioSource audio; void Awake() { overallDistance = 0; lastDistance = 0; timer = 0; lastTime = 0; speed = 0; speed0 = 0; firstTime = true; allowTimer = true; } IEnumerator Start() { // First, check if user has location service enabled if (!Input.location.isEnabledByUser) yield break; // Start service before querying location Input.location.Start(1, 1); // Wait until service initializes int maxWait = 20; while (Input.location.status == LocationServiceStatus.Initializing && maxWait > 0) { yield return new WaitForSeconds(1); maxWait--; } // Service didn't initialize in 20 seconds if (maxWait < 1) { print("Timed out"); yield break; } // Connection has failed if (Input.location.status == LocationServiceStatus.Failed) { print("Unable to determine device location"); yield break; } else { // Access granted and location value could be retrieved print("Location: " + Input.location.lastData.latitude + " " + Input.location.lastData.longitude + " " + Input.location.lastData.altitude + " " + Input.location.lastData.horizontalAccuracy + " " + Input.location.lastData.timestamp); longitude.text = Input.location.lastData.longitude.ToString(); latitude.text = Input.location.lastData.latitude.ToString(); lonA = Input.location.lastData.longitude; latA = Input.location.lastData.latitude; } // Stop service if there is no need to query location updates continuously //Input.location.Stop(); } void Update() { longitude.text = Input.location.lastData.longitude.ToString(); latitude.text = Input.location.lastData.latitude.ToString(); timer += Time.deltaTime; timerText.text = timer.ToString(); if (lonA != Input.location.lastData.longitude || latA != Input.location.lastData.latitude) { audio.Play(); CalculateDistances(lonA, latA, Input.location.lastData.longitude, Input.location.lastData.latitude); // last distance and overall distanceS lonA = Input.location.lastData.longitude; latA = Input.location.lastData.latitude; lastTime = timer; lastTimeText.text = lastTime.ToString(); timer = 0; speed0 = speed; speed0Text.text = speed0.ToString(); CalculateSpeed(); CalculateAcceleration(); } } public static float Radians(float x) { return x * Mathf.PI / 180; } public void CalculateDistances(float firstLon, float firstLat, float secondLon, float secondLat) { lonAText.text = firstLon.ToString(); latAText.text = firstLat.ToString(); lonBText.text = secondLon.ToString(); latBText.text = secondLat.ToString(); float dlon = Radians(secondLon - firstLon); float dlat = Radians(secondLat - firstLat); float distance = Mathf.Pow(Mathf.Sin(dlat / 2), 2) + Mathf.Cos(Radians(firstLat)) * Mathf.Cos(Radians(secondLat)) * Mathf.Pow(Mathf.Sin(dlon / 2), 2); float c = 2 * Mathf.Atan2(Mathf.Sqrt(distance), Mathf.Sqrt(1 - distance)); lastDistance = 6371 * c * 1000; result.text = lastDistance.ToString() + " meters"; overallDistance += lastDistance; // bu 1 anliq 6.000.000-dan boyuk qiymet ala biler StartCoroutine(Overall()); } IEnumerator Overall() { if (firstTime) { firstTime = false; yield return new WaitForSeconds(2); if (overallDistance > 6000000) { overallDistance = 0; lastDistance = 0; } } overallDistance += lastDistance; overallResult.text = overallDistance.ToString() + " meters"; } void CalculateSpeed() { speed = lastDistance / lastTime * 3.6f; speedText.text = speed.ToString(); } void CalculateAcceleration() { acceleration = (speed - speed0) / lastTime; accelerationText.text = acceleration.ToString(); } } Thanks for any help and tip
PS. Please edit my question if I made any grammar and logical mistake.