minimum update time in phoneGap App with watchPosition or getCurrentPosition? - iphone

Question

I am having some trouble when update GPS location very fast, I need update location every 100ms. In my solutions I observe that the GPS location will update every second and not faster :(
I've try with setInterval:
function localize(){
if(navigator.geolocation)
{
navigator.geolocation.getCurrentPosition(function(position){
var element = document.getElementById('geolocation');
element.innerHTML = 'Latitude: ' + position.coords.latitude + '<br />' +
'Longitude: ' + position.coords.longitude + '<br />' +
'Altitude: ' + position.coords.altitude + '<br />' +
'Accuracy: ' + position.coords.accuracy + '<br />' +
'Altitude Accuracy: ' + position.coords.altitudeAccuracy + '<br />' +
'Heading: ' + position.coords.heading + '<br />' +
'Speed: ' + position.coords.speed + '<br />' +
'Timestamp: ' + position.timestamp + '<br />';
},function(error){
alert('code: ' + error.code + '\n' +
'message: ' + error.message + '\n');
}, { maximumAge:100, timeout:100, enableHighAccuracy:true });
}else{
handleNoGeolocation(false);
}
}
localize();
setInterval(localize, 100);
}
with setTimeout:
localize();
function localize(){
if(navigator.geolocation)
{
navigator.geolocation.getCurrentPosition(function(position){
var element = document.getElementById('geolocation');
element.innerHTML = 'Latitude: ' + position.coords.latitude + '<br />' +
'Longitude: ' + position.coords.longitude + '<br />' +
'Altitude: ' + position.coords.altitude + '<br />' +
'Accuracy: ' + position.coords.accuracy + '<br />' +
'Altitude Accuracy: ' + position.coords.altitudeAccuracy + '<br />' +
'Heading: ' + position.coords.heading + '<br />' +
'Speed: ' + position.coords.speed + '<br />' +
'Timestamp: ' + position.timestamp + '<br />';
},function(error){
alert('code: ' + error.code + '\n' +
'message: ' + error.message + '\n');
}, { maximumAge:100, timeout:100, enableHighAccuracy:true });
setTimeout(localize, 100);
}else{
handleNoGeolocation(false);
}
}
setInterval(localize, 100);
}
or whatchPosition:
localize();
function localize(){
if(navigator.geolocation)
{
navigator.geolocation.watchPosition(function(position){
var element = document.getElementById('geolocation');
element.innerHTML = 'Latitude: ' + position.coords.latitude + '<br />' +
'Longitude: ' + position.coords.longitude + '<br />' +
'Altitude: ' + position.coords.altitude + '<br />' +
'Accuracy: ' + position.coords.accuracy + '<br />' +
'Altitude Accuracy: ' + position.coords.altitudeAccuracy + '<br />' +
'Heading: ' + position.coords.heading + '<br />' +
'Speed: ' + position.coords.speed + '<br />' +
'Timestamp: ' + position.timestamp + '<br />';
},function(error){
alert('code: ' + error.code + '\n' +
'message: ' + error.message + '\n');
}, { maximumAge:100, timeout:100, enableHighAccuracy:true });
setTimeout(localize, 100); //with or without
}else{
handleNoGeolocation(false);
}
}
}
I've tried with or without maximumAge and timeout option.
My device is iPhone 5.

Answer 1

GPS devices in consumer phones update not more than once a second.
You will not get a 100ms interval, whatever you do.
So change your algorithm (interpolate) to work with 1 s.

Answer 2

Yes Gps can't send an update up to 1s.
And I find this in the Android project made by Cordova. I think this can help you. Maybe it's the same thing in IOS project ?
I just discover one masive problem in Cordova/PhoneGap : - When you open the Android project built by cordova (in commandline), the requestUpdate is set at ..... 60 Seconds !!!!!!!!!!! You have a new Location every Minute ! Evenif you use GPS (enableHighAccuracy="true"). So try to set this at 1000 where you find LocationManager.GPS_PROVIDER in org.apache.cordova.geolocation package -> GPSListener class !
Coco