parameters: (lat, lon, alt, reflat, reflon, refalt)
return_statement: return tx, ty, tz
docstring: Transform from lat, lon, alt to topocentric XYZ.
  
      >>> lat, lon, alt = -10, 20, 100
      >>> np.allclose(topocentric_from_lla(lat, lon, alt, lat, lon, alt),
      ...     [0,0,0])
      True
      >>> x, y, z = topocentric_from_lla(lat, lon, alt, 0, 0, 0)
      >>> np.allclose(lla_from_topocentric(x, y, z, 0, 0, 0),
      ...     [lat, lon, alt])
      True
docstring_summary: Transform from lat, lon, alt to topocentric XYZ.
docstring_tokens: Transform from lat lon alt to topocentric XYZ .
function: def topocentric_from_lla(lat, lon, alt, reflat, reflon, refalt):
      """
      Transform from lat, lon, alt to topocentric XYZ.
  
      >>> lat, lon, alt = -10, 20, 100
      >>> np.allclose(topocentric_from_lla(lat, lon, alt, lat, lon, alt),
      ...     [0,0,0])
      True
      >>> x, y, z = topocentric_from_lla(lat, lon, alt, 0, 0, 0)
      >>> np.allclose(lla_from_topocentric(x, y, z, 0, 0, 0),
      ...     [lat, lon, alt])
      True
      """
      T = np.linalg.inv(ecef_from_topocentric_transform(reflat, reflon, refalt))
      x, y, z = ecef_from_lla(lat, lon, alt)
      tx = T[0, 0] * x + T[0, 1] * y + T[0, 2] * z + T[0, 3]
      ty = T[1, 0] * x + T[1, 1] * y + T[1, 2] * z + T[1, 3]
      tz = T[2, 0] * x + T[2, 1] * y + T[2, 2] * z + T[2, 3]
      return tx, ty, tz
function_tokens: def topocentric_from_lla ( lat , lon , alt , reflat , reflon , refalt ) : T = np . linalg . inv ( ecef_from_topocentric_transform ( reflat , reflon , refalt ) ) x , y , z = ecef_from_lla ( lat , lon , alt ) tx = T [ 0 , 0 ] * x + T [ 0 , 1 ] * y + T [ 0 , 2 ] * z + T [ 0 , 3 ] ty = T [ 1 , 0 ] * x + T [ 1 , 1 ] * y + T [ 1 , 2 ] * z + T [ 1 , 3 ] tz = T [ 2 , 0 ] * x + T [ 2 , 1 ] * y + T [ 2 , 2 ] * z + T [ 2 , 3 ] return tx , ty , tz