public void ParseGpsDirectory_ValidDirectory_LatLongMetadata()
{
var gpsDirectory = new GpsDirectory();
var photo = new Photo("");
var gpsReference = "N";
var gpsRationalArr = new Rational[3]
{
new Rational(1, 1),
new Rational(60, 1),
new Rational(3600, 1)
};
gpsDirectory.Set(GpsDirectory.TagLatitudeRef, gpsReference);
gpsDirectory.Set(GpsDirectory.TagLatitude, gpsRationalArr);
gpsDirectory.Set(GpsDirectory.TagLongitudeRef, gpsReference);
gpsDirectory.Set(GpsDirectory.TagLongitude, gpsRationalArr);
gpsDirectory.Parse(photo);
var actualLatitude = photo.Latitude;
var actualLongitude = photo.Longitude;
var expectedLatitude = MetadataConverter.DegreesMinutesSecondsToDecimalDegrees(gpsRationalArr, gpsReference);
var expectedLongitude = MetadataConverter.DegreesMinutesSecondsToDecimalDegrees(gpsRationalArr, gpsReference);
Assert.Equal(expectedLatitude, actualLatitude);
Assert.Equal(expectedLongitude, actualLongitude);
}
/// <summary>Parses <see cref="GpsDirectory" /> metadata and saves it to the <see cref="Photo" />.</summary>
/// <param name="directory">Directory containing the GPS metadata.</param>
/// <param name="photo">Photo object used for storing metadata.</param>
public static void Parse(this GpsDirectory directory, Photo photo)
{
if (directory is null || photo is null)
{
return;
}
var gpsLatRef = directory.GetString(GpsDirectory.TagLatitudeRef);
var gpsLat = directory.GetRationalArray(GpsDirectory.TagLatitude);
var gpsLonRef = directory.GetString(GpsDirectory.TagLongitudeRef);
var gpsLon = directory.GetRationalArray(GpsDirectory.TagLongitude);
var latitude = MetadataConverter.DegreesMinutesSecondsToDecimalDegrees(gpsLat, gpsLatRef);
var longitude = MetadataConverter.DegreesMinutesSecondsToDecimalDegrees(gpsLon, gpsLonRef);
photo.Latitude = latitude;
photo.Longitude = longitude;
// if we cannot get both the altitude and its reference, do not save anything
if (directory.TryGetByte(GpsDirectory.TagAltitudeRef, out var gpsAltBit) &&
directory.TryGetInt16(GpsDirectory.TagAltitude, out var gpsAlt))
{
photo.AltitudeReference = gpsAltBit == 0 ? "Sea level" : "Below sea level";
photo.Altitude = gpsAlt;
}
}
public void ComputeGpsDmsToDecimalDegrees_InvalidDms()
{
var degMinSec = new Rational[2];
var actual = MetadataConverter.DegreesMinutesSecondsToDecimalDegrees(degMinSec, "");
Assert.Null(actual);
}
public void ComputeGpsDmsToDecimalDegrees_ValidDms_InvalidGpsReference()
{
var degMinSec = new Rational[3];
degMinSec[0] = new Rational(1, 1); // 1
degMinSec[1] = new Rational(60, 1); // 60
degMinSec[2] = new Rational(3600, 1); // 3600
Assert.Throws <ArgumentException>(() => MetadataConverter.DegreesMinutesSecondsToDecimalDegrees(degMinSec, "A"));
}
public void ComputeGpsDmsToDecimalDegrees_ValidDms_SouthGpsReference()
{
var degMinSec = new Rational[3];
degMinSec[0] = new Rational(1, 1); // 1
degMinSec[1] = new Rational(60, 1); // 60
degMinSec[2] = new Rational(3600, 1); // 3600
var expected = -3.0; // -1 * (1 + 60/60 + 3600/3600) = -3.0
var actual = MetadataConverter.DegreesMinutesSecondsToDecimalDegrees(degMinSec, "S");
Assert.Equal(expected, actual);
}
public void ComputeGpsDmsToDecimalDegrees_NullDms()
{
var actual = MetadataConverter.DegreesMinutesSecondsToDecimalDegrees(null, "S");
Assert.Null(actual);
}
