How to Fetch the Geotag details of the captured image or stored image in Windows phone 8

Question

I want to fetch the information from the image regarding the Geolocation as shown in the image below

 void cam_Completed(object sender, PhotoResult e)
        {
            if (e.TaskResult == TaskResult.OK)
            {

                Image cameraImage = new Image();
                BitmapImage bImage = new BitmapImage();

                bImage.SetSource(e.ChosenPhoto);
                cameraImage.Source = bImage;

                e.ChosenPhoto.Position = 0;

                ExifReader reader = new ExifReader(e.ChosenPhoto);
                double gpsLat, gpsLng;

                reader.GetTagValue<double>(ExifTags.GPSLatitude,
                                                    out gpsLat))

                reader.GetTagValue<double>(ExifTags.GPSLongitude,
                                                    out gpsLng))


                MessageBox.Show(gpsLat.ToString() + "" + gpsLng.ToString());   

            }
        }

so that we can detect location where the image was taken. Please help to find the these property.

Answer 1

You will need to read the EXIF data from the image.

You can use a library such as this

// Instantiate the reader
ExifReader reader = new ExifReader(@"..path to your image\...jpg");

// Extract the tag data using the ExifTags enumeration
double gpsLat, gpsLng;
if (reader.GetTagValue<double>(ExifTags.GPSLatitude, 
                                    out gpsLat))
{
    // Do whatever is required with the extracted information
    //...
}
if (reader.GetTagValue<double>(ExifTags.GPSLongitude, 
                                    out gpsLng))
{
    // Do whatever is required with the extracted information
    //...
}

UPDATE. Code changed to use MemoryStream

    void cam_Completed(object sender, PhotoResult e)
    {
        if (e.TaskResult == TaskResult.OK)
        {
            using (MemoryStream memo = new MemoryStream())
            {
                e.ChosenPhoto.CopyTo(memo);
                memo.Position = 0;
                using (ExifReader reader = new ExifReader(memo))
                {
                    double[] latitudeComponents;
                    reader.GetTagValue(ExifTags.GPSLatitude, out latitudeComponents);

                    double[] longitudeComponents;
                    reader.GetTagValue(ExifTags.GPSLongitude, out longitudeComponents);

                    // Lat/long are stored as D°M'S" arrays, so you will need to reconstruct their values as below:
                    var latitude = latitudeComponents[0] + latitudeComponents[1] / 60 + latitudeComponents[2] / 3600;
                    var longitude = longitudeComponents[0] + longitudeComponents[1] / 60 + longitudeComponents[2] / 3600;

                    // latitude and longitude should now be set correctly...
                }
            }
        }
    }