73 | | uIxPS, uIyPS, uIxxPS, uIyyPS |

74 | | uIxSG, uIySG, uIxxSG, uIyySG |

75 | | }}} |

76 | | |

| 73 | uIxPS, uIyPS, uIxyPS, uIxxPS, uIyyPS |

| 74 | uIxSG, uIySG, uIxySG, uIxxSG, uIyySG |

| 75 | }}} |

| 78 | |

| 79 | The moments are defined as: |

| 80 | * Ix = integral_over_footprint[w(x-x0,y-y0)*f(x,y)*(x-x0)] |

| 81 | * Iy= integral_over_footprint[w(x-x0,y-y0)*f(x,y)*(y-y0)] |

| 82 | * Ixy = integral_over_footprint[w(x-x0,y-y0)*f(x,y)*(x-x0)*(y-y0)] |

| 83 | * Ixx= integral_over_footprint[w(x-x0,y-y0)*f(x,y)*(x-x0)*(x-x0)] |

| 84 | * Iyy = integral_over_footprint[w(x-x0,y-y0)*f(x,y)*(y-y0)*(y-y0)] |

| 85 | |

| 86 | Where: |

| 87 | * x0,y0 is the object center |

| 88 | * w(x,y) is a weighting function |

| 89 | * f(x,y) is the flux |