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Re: AI-GEOSTATS: Re: polygon kriging

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  • Isobel Clark
    Chaosheng This is very true that if you grid a grid of points inside a polygonal area then average them, you get exactly the same answer as if you kriged the
    Message 1 of 2 , Feb 22 4:21 AM
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      Chaosheng

      This is very true that if you grid a grid of points
      inside a polygonal area then average them, you get
      exactly the same answer as if you kriged the polygon
      average directly.

      The differences are two:

      (1) you have to do at least 64 krigings to get within
      1% of the correct average answer (see my paper at the
      first Geostat Congress in 1975)

      (2) if you do one kriging for the polygon average, you
      get the kriging variance for the polygon average. You
      can derive this from the discretised point kriging
      variances but you have to do even more work (64
      squared) than in (1).

      Isobel
      http://geoecosse.bizland.com/whatsnew.htm





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