Loading ...
Sorry, an error occurred while loading the content.
 

Re: AI-GEOSTATS: fitting a variogram

Expand Messages
  • Monica Palaseanu-Lovejoy
    Hi, Did you try more than one manual fitting? Which has the smallest error???? The first fitting the ArcGIS is doing is very automatic if i can say it -
    Message 1 of 2 , Mar 2, 2004
      Hi,

      Did you try more than one "manual" fitting? Which has the
      smallest error???? The first fitting the ArcGIS is doing is very
      "automatic" if i can say it - and you can do manual fittings with
      better errors (i mean smaller errors). Try more than one kriging
      method, change the neighbourhood and the min and max number
      of known values in the neighbourhood, see if directional kriging will
      not be better and so on. The idea is that you do lots of kriging
      using different semi-variograms and you record their parameters
      and what errors you will get. Do a cross-validation and see which
      performs better. Afterwards you can compute the prediction
      confidence intervals by one of the methods available - like
      likelihood or bootstrapping or bayesian .... some or all of them are
      implemented in R - a free environment very similar with S-PLUS.

      I hope this helps,

      Monica

      --
      * To post a message to the list, send it to ai-geostats@...
      * As a general service to the users, please remember to post a summary of any useful responses to your questions.
      * To unsubscribe, send an email to majordomo@... with no subject and "unsubscribe ai-geostats" followed by "end" on the next line in the message body. DO NOT SEND Subscribe/Unsubscribe requests to the list
      * Support to the list is provided at http://www.ai-geostats.org
    Your message has been successfully submitted and would be delivered to recipients shortly.