Reverse Geo Code Lookup

[itg-assistant]

Ewan Walker asked 2018-07-27 08:16:57 UTC

I need to be able to return the latitude and longitude of where the person is using my Wise J app.

I also need to perform a reverse geocode lookup to get the postcode.

How do I use the geo location extension to do this? Ok got this working now

Does your Google Maps Extension perform reverse geocode lookup, if so how?

Many thanks for your help

[itg-assistant]

Tiago (ITG) answered 2018-07-27 12:10:34 UTC

Hi Ewan,

If I understand it correctly you want to perform Reverse geocoding right?

[itg-assistant]

edmond girardi answered 2018-07-27 13:29:11 UTC

Take a look at this:

https://www.w3schools.com/htmL/html5_geolocation.asp

[itg-assistant]

Tiago (ITG) answered 2018-07-27 14:06:03 UTC

Hi Edmond. We do have a GeoLocation extension https://github.com/iceteagroup/wisej-extensions/tree/master/Wisej.Ext.Geolocation and Ewan got around to work with it.

[itg-assistant]

Tiago (ITG) answered 2018-07-27 14:10:19 UTC

Something like https://stackoverflow.com/questions/19410395/reverse-geocoding-google-maps-v3 ?

[itg-assistant]

Ewan Walker answered 2018-07-27 14:32:32 UTC

Hi Tiago

Yes I need to perform Reverse geocoding. Can a do this via the WiseJ Google Maps Extension?

[itg-assistant]

Tiago (ITG) answered 2018-07-27 15:10:21 UTC

Hi Ewan,

Currently there is no support for Reverse Geoding in Web.Ext.GoogleMaps.GoogleMap

Support for Maps might change in the near future, following this thread about alternative maps libraries

I'll register a feature request.

[itg-assistant]

edmond girardi answered 2018-07-27 20:35:05 UTC

Forgot !

[itg-assistant]

Ewan Walker answered 2018-07-28 11:42:23 UTC

Hi Tiago

Thanks.

I realised that I didn't need Reverse Geocode as the data returned is usually based on the centre of a post code.

If instead I get the Site manager to capture the Latitude and Longitude at the Site itself, I can use this as a basis for comparison, moving forwards.

Tests show it is far more accurate that just getting the coordinates for a post code.

I want to be able to establish that when staff register their arrival at the Site they are actually there.

[itg-assistant]

Tiago (ITG) answered 2018-07-31 11:54:24 UTC

Hi Ewan,

The Wisej.Web.Ext.GoogleMaps extension on GitHib was updated to support reverse geocoding.

The GoogleMaps example on GitHub was also updated and shows how to use the new feature. This sample now uses the Geolocation extension to find the browser's current location coordinates: you can get the current coordinates and then get the postal address.

[itg-assistant]

Ewan Walker answered 2018-07-31 13:24:47 UTC

Thank you very much Tiago

[itg-assistant]

Ewan Walker answered 2018-08-09 11:41:27 UTC

Hi Tiago

I am missing something here - GeocoderResult[] never gets called

private string _lastQuery;
private GoogleMap Map = new GoogleMap();
private GeocoderResult[] _geocodes;

public string Address { get; private set; }
public GeocoderResult[] Geocodes
{
get { return _geocodes; }
private set
{
_geocodes = value;
}
}

private async void getAddress(string Latitude, String Longitude)
{
_lastQuery = $"Lat: {Latitude} Lng:{Longitude}";
Geocodes = await Map.GetGeocodeAsync(double.Parse(Latitude), double.Parse(Longitude));
if (Geocodes[0].IsError)
{
MessageBox.Show($"Received error {Geocodes[0].ResultCode}",
"Search Error",
MessageBoxButtons.OK,
MessageBoxIcon.Error);
Geocodes = null;
}
else
{
Address = Geocodes[0].FormattedAddress;
}
}

Alternatively I think I need to call it synchronously.

Map.GetGeocode(Bb, double.Parse(Latitude), double.Parse(Longitude));
Address = Bb[0].ToString();

However how do I instantiate Action Bb?

Thanks

Ewan

[itg-assistant]

Tiago (ITG) answered 2018-08-09 15:51:18 UTC

Hi Ewan,

Please attach a sample.

[itg-assistant]

Ewan Walker answered 2018-08-09 19:45:15 UTC

Hi Tiago

Aysnc sample attached

How do I use the sync version? Specifically insatiate Bb?

Map.GetGeocode(Bb, double.Parse(Latitude), double.Parse(Longitude));
Address = Bb[0].ToString();

[itg-assistant]

Tiago (ITG) answered 2018-08-09 22:32:41 UTC

I’ll have a look. There is no sync method: either you use a callback or you await the Async method