Geocoding and Reverse Geocoding
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The document provides guidance on using the Geolocator class in a Windows application for obtaining geographical location data, including setting the desired accuracy and retrieving position information. It details the process of getting latitude and longitude values, as well as performing reverse geocoding to obtain an address from coordinates. Additionally, it references resources for further learning on Windows 10 development.
![var geolocator = new Geolocator();
geolocator.DesiredAccuracyInMeters = 100;
geolocator.DesiredAccuracy = PositionAccuracy.High;
Geoposition position = await geolocator.GetGeopositionAsync();
// reverse geocoding
BasicGeoposition myLocation = new BasicGeoposition
{
Longitude = position.Coordinate.Point.Position.Longitude,
Latitude = position.Coordinate.Point.Position.Latitude
};
Geopoint pointToReverseGeocode = new Geopoint(myLocation);
MapLocationFinderResult result = await MapLocationFinder.FindLocationsAtAsync(pointToReverseGeocode);
if (result.Status == MapLocationFinderStatus.Success)
{
if (result.Locations.Count != 0)
{
// here also it should be checked if there result isn't null and what to do in such a case
string country = result.Locations[0].Address.FormattedAddress;
txtLocation.Text += country.ToString();
}
}
11/23/2015 Prepared by ENG SOON CHEAH](https://image.slidesharecdn.com/geocodingreversegeocoding-151123113511-lva1-app6892/85/Geocoding-and-Reverse-Geocoding-5-320.jpg)
Geocoding and Reverse Geocoding
- 1. Prepared by ENG SOON CHEAH Microsoft MVP 11/23/2015 Prepared by ENG SOON CHEAH
- 2. 11/23/2015 Prepared by ENG SOON CHEAH
- 3. Geolocator geolocator = new Geolocator(); // Define the accuracy for the location service in meters // There is no point to set the accuracy to any value below 5; // Also can define the location service accuracy in DesiredAccuracy with the options of Default or High geolocator.DesiredAccuracyInMeters = 10; Geoposition currentposition = await geolocator.GetGeopositionAsync( maximumAge: TimeSpan.FromMinutes(5), // to specify the aging of the cache timeout: TimeSpan.FromSeconds(10)); // to specify the timeout for the getting the location information // There is meaningless to obtaion the position value beyond 6 decimal points. // It will ONLY crate unncessary calculation. // // Obtain the position value from Coordinate.Point.Position, the information in .Coordinate is retiring. string latitude = currentposition.Coordinate.Point.Position.Latitude.ToString("0.000000"); string longitude = currentposition.Coordinate.Point.Position.Longitude.ToString("0.000000"); txtLocation.Text = latitude + "," + longitude; 11/23/2015 Prepared by ENG SOON CHEAH
- 4. 11/23/2015 Prepared by ENG SOON CHEAH
- 5. var geolocator = new Geolocator(); geolocator.DesiredAccuracyInMeters = 100; geolocator.DesiredAccuracy = PositionAccuracy.High; Geoposition position = await geolocator.GetGeopositionAsync(); // reverse geocoding BasicGeoposition myLocation = new BasicGeoposition { Longitude = position.Coordinate.Point.Position.Longitude, Latitude = position.Coordinate.Point.Position.Latitude }; Geopoint pointToReverseGeocode = new Geopoint(myLocation); MapLocationFinderResult result = await MapLocationFinder.FindLocationsAtAsync(pointToReverseGeocode); if (result.Status == MapLocationFinderStatus.Success) { if (result.Locations.Count != 0) { // here also it should be checked if there result isn't null and what to do in such a case string country = result.Locations[0].Address.FormattedAddress; txtLocation.Text += country.ToString(); } } 11/23/2015 Prepared by ENG SOON CHEAH
- 6. This Result include Geocoding (Coordinates) and Reverse Geocoding 11/23/2015 Prepared by ENG SOON CHEAH
- 7. • Microsoft Virtual Academy https://mva.microsoft.com/en-US/training-courses/a-developer- s-guide-to-windows-10-12618?l=o3HUevpRB_8105095281 • Channel 9 https://channel9.msdn.com/Series/Windows-10-development- for-absolute-beginners • GitHub https://github.com/cheahengsoon/ • SlideShare http://www.slideshare.net/cheahengsoon/ 11/23/2015 Prepared by ENG SOON CHEAH