Geometric coordinate transforms (sarpy.geometry.geocoords)

Provides coordinate transforms for WGS-84 and ECF coordinate systems

sarpy.geometry.geocoords.ecf_to_geodetic(ecf, ordering='latlong')

Converts ECF (Earth Centered Fixed) coordinates to WGS-84 coordinates.

Parameters:

  • ecf (numpy.ndarray|list|tuple) –

  • ordering (str) – If ‘longlat’, then the return will be [longitude, latitude, hae]. Otherwise, the return will be [latitude, longitude, hae].

Returns:

The WGS-84 coordinates, of the same shape as ecf.

Return type:

numpy.ndarray

sarpy.geometry.geocoords.geodetic_to_ecf(llh, ordering='latlong')

Converts WGS-84 coordinates to ECF (Earth Centered Fixed).

Parameters:

  • llh (numpy.ndarray|list|tuple) –

  • ordering (str) – If ‘longlat’, then the input is [longitude, latitude, hae]. Otherwise, the input is [latitude, longitude, hae].

Returns:

The ECF coordinates, of the same shape as llh.

Return type:

numpy.ndarray

sarpy.geometry.geocoords.wgs_84_norm(ecf)

Calculates the normal vector to the WGS_84 ellipsoid at the given ECF coordinates.

Parameters:

ecf (numpy.ndarray|list|tuple) –

Returns:

The normal vector, of the same shape as ecf.

Return type:

numpy.ndarray

sarpy.geometry.geocoords.ecf_to_ned(ecf_coords, orp_coord, absolute_coords=True)

Convert from ECF to North-East-Down (NED) coordinates.

Parameters:

  • ecf_coords (numpy.ndarray) –

  • orp_coord (numpy.ndarray) –

  • absolute_coords (bool) – Are these absolute (i.e. position) coordinates? The alternative is relative coordinates like velocity, acceleration, or unit vector values.

Return type:

numpy.ndarray

sarpy.geometry.geocoords.ned_to_ecf(ned_coords, orp_coord, absolute_coords=True)

Convert from North-East-Down (NED) to ECF coordinates.

Parameters:

  • ned_coords (numpy.ndarray) – The NED coordinates.

  • orp_coord (numpy.ndarray) – The Origin Reference Point in ECF coordinates.

  • absolute_coords (bool) – Are these absolute (i.e. position) coordinates? The alternative is relative coordinates like velocity, acceleration, or unit vector values.

Return type:

numpy.ndarray

sarpy.geometry.geocoords.ecf_to_enu(ecf_coords, orp_coord, absolute_coords=True)

Convert from ECF to East-North-Up (ENU) coordinates.

Parameters:

  • ecf_coords (numpy.ndarray) –

  • orp_coord (numpy.ndarray) –

  • absolute_coords (bool) – Are these absolute (i.e. position) coordinates? The alternative is relative coordinates like velocity, acceleration, or unit vector values.

Return type:

numpy.ndarray

sarpy.geometry.geocoords.enu_to_ecf(enu_coords, orp_coord, absolute_coords=True)

Convert from East-North-UP (ENU) to ECF coordinates.

Parameters:

  • enu_coords (numpy.ndarray) – The ENU coordinates.

  • orp_coord (numpy.ndarray) – The Origin Reference Point in ECF coordinates.

  • absolute_coords (bool) – Are these absolute (i.e. position) coordinates? The alternative is relative coordinates like velocity, acceleration, or unit vector values.

Return type:

numpy.ndarray