Beispiel #1
0
// Transform a latitude / longitude coordinate datum into a BMN coordinate. Function returns
// EINVAL, if the meridian stripe of the bmn-coordinate is not set.
//
// Important: The reference ellipsoid of the originating coordinate system will be assumed
// to be the WGS84Ellipsoid and will be set thereupon, regardless of the actually set reference ellipsoid.
func WGS84LatLongToBMN(gc *cartconvert.PolarCoord, meridian BMNMeridian) (*BMNCoord, os.Error) {

	var long0, fe float64

	// This sets the Ellipsoid to WGS84, regardless of the actual value set
	gc.El = cartconvert.WGS84Ellipsoid

	cart := cartconvert.PolarToCartesian(gc)
	pt := cartconvert.HelmertWGS84ToMGI.Transform(&cartconvert.Point3D{X: cart.X, Y: cart.Y, Z: cart.Z})
	polar := cartconvert.CartesianToPolar(&cartconvert.CartPoint{X: pt.X, Y: pt.Y, Z: pt.Z, El: cartconvert.Bessel1841MGIEllipsoid})

	// Determine meridian stripe based on longitude
	if meridian == BMNZoneDet {
		switch {
		case 11.0+0.5/6*10 >= polar.Longitude && polar.Longitude >= 8.0+0.5/6*10:
			meridian = BMNM28
		case 14.0+0.5/6*10 >= polar.Longitude && polar.Longitude >= 11.0+0.5/6*10:
			meridian = BMNM31
		case 17.0+0.5/6*10 >= polar.Longitude && polar.Longitude >= 14.0+0.5/6*10:
			meridian = BMNM34
		}
	}

	switch meridian {
	case BMNM28:
		long0 = 10.0 + 20.0/60.0
		fe = 150000
	case BMNM31:
		long0 = 13.0 + 20.0/60.0
		fe = 450000
	case BMNM34:
		long0 = 16.0 + 20.0/60.0
		fe = 750000
	default:
		return nil, os.EINVAL
	}

	gp := cartconvert.DirectTransverseMercator(
		polar,
		0,
		long0,
		1,
		fe,
		-5000000)

	return &BMNCoord{Meridian: meridian, Height: gp.Y, Right: gp.X, el: gp.El}, nil
}
Beispiel #2
0
// Transform a latitude / longitude coordinate datum into a OSGB36 coordinate.
//
// Important: The reference ellipsoid of the originating coordinate system will be assumed
// to be the WGS84Ellipsoid and will be set thereupon, regardless of the actually set reference ellipsoid.
func WGS84LatLongToOSGB36(gc *cartconvert.PolarCoord) (*OSGB36Coord, os.Error) {
	// This sets the Ellipsoid to WGS84, regardless of the actual value set
	gc.El = cartconvert.WGS84Ellipsoid

	cart := cartconvert.PolarToCartesian(gc)
	pt := cartconvert.HelmertWGS84ToOSGB36.Transform(&cartconvert.Point3D{X: cart.X, Y: cart.Y, Z: cart.Z})
	polar := cartconvert.CartesianToPolar(&cartconvert.CartPoint{X: pt.X, Y: pt.Y, Z: pt.Z, El: cartconvert.Airy1830Ellipsoid})

	gp := cartconvert.DirectTransverseMercator(
		polar,
		49,
		-2,
		0.9996012717,
		400000,
		-100000)

	return GridRefNumToLet(uint(gp.X+0.5), uint(gp.Y+0.5), 0, OSGB36_Max)
}
Beispiel #3
0
// Transform a latitude / longitude coordinate datum into a Swiss coordinate. Function returns
// EINVAL, if the coordinate type is not set.
//
// Important: The reference ellipsoid of the originating coordinate system will be assumed
// to be the GRS80Ellipsoid and will be set thereupon, regardless of the actually set reference ellipsoid.
func GRS80LatLongToSwissCoord(gc *cartconvert.PolarCoord, coordType SwissCoordType) (*SwissCoord, os.Error) {

	var fn, fe float64

	// This sets the Ellipsoid to GRS80, regardless of the actual value set
	gc.El = cartconvert.GRS80Ellipsoid

	cart := cartconvert.PolarToCartesian(gc)
	// According to literature, the Granit87 parameters shall not be used in favour of
	// higher accuracy of the following shift values

	// pt := cartconvert.HelmertWGS84ToMGI.Transform(&cartconvert.Point3D{X: cart.X, Y: cart.Y, Z: cart.Z})
	pt := &cartconvert.Point3D{X: cart.X - 674.374, Y: cart.Y - 15.056, Z: cart.Z - 405.346}
	polar := cartconvert.CartesianToPolar(&cartconvert.CartPoint{X: pt.X, Y: pt.Y, Z: pt.Z, El: cartconvert.Bessel1841Ellipsoid})

	switch coordType {
	case LV03:
		fe = 600000
		fn = 200000
	case LV95:
		fe = -2600000
		fn = -1200000
	default:
		return nil, os.EINVAL
	}

	gp := cartconvert.DirectTransverseMercator(
		polar,
		46.952406, // lat0
		7.439583,  // long0
		1,
		fe, // fe
		fn) // fn

	return &SwissCoord{CoordType: coordType, Northing: gp.Y, Easting: gp.X, el: gp.El}, nil
}