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8. Why is this work important? Ϊʲô¸ÃÎĵÄÑо¿±È½ÏÖØÒª£¿£¨Ñо¿ÒâÒ壩

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good idea. It's useful for people who are confounding in how to read scientific papers effectively.
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summary on ¡°A. Boucher (2009): Considering complex training images with search tree partitioning, Computers & Geosciences, 35, 1151-1158.¡±

1. What is the problem the authors are trying to solve?
To solve the difficulty of large complex TI to be used in SNESIM.

2. What other approaches or solutions existed at the time that this work was done?
To decrease the size of search tree, general approaches are taking a smaller TI or using a smaller template. Besides, there are two alternative approaches in current practice:  1) region approach 2) probability field approach.

3. What was wrong with the other approaches or solutions?
A major issue with the region approach is that there is no guarantee that the different TIs used are compatible with one another. The problem with this probability field approach is that integration changes the conditional probability derived from the search tree and affects the pattern reproduction in an unknown manner.

4. What is the authors' approach or solution?
  The authors proposed a search tree partitioning approach which includes:
        Applying the filters on the TI to gain a series of filter scores that are indicative of the underlying patterns.
        Defining partition classes through the filter scores with a clustering algorithm
        Building search tree for each partition class
        At each pixel along the simulation path, the partition class is retrieved first and used to select the appropriate search tree.

5. Why is it better than the other approaches or solutions?
The proposed algorithm adds local information without using a probability field which distorts the conditional distribution obtained from the TI. It improves the region approach by requiring a single complete TI and implicitly models the transitions between regions. It facilitates the use of hierarchical framework by identifying the hierarchy structures with partition classes.

6. How did they test their solution?
They gave two examples of implementation of their approach. The first example is to simulate a series of fracture.  The second is to simulate Shallow-water tidal system. They also made the comparison to the result pattern by global search tree approach.

7. How does it perform?
Performance is very good. In the fracture case, the trend in orientation is well reproduced. In the second one the geological consistency of the TI is reproduced. These features are not exhibited in the realization by global search tree approach. Besides, the speed improved.

8. Comments & other questions
*The simulation grid can be obtained in many ways. Do the different simulation grids influence realization?
*FILTERSIM as a similar approach is interesting to compare with the authors approach.
*A. Boucher¡¯s effort to integrate new algorithm to SGeMS is interesting and respectable. Open Geostatistic software will allow more researchers to test, apply and extend the algorithm in an easier manner.

[ Last edited by ¼«¶ÈÁé¸Ð on 2009-12-27 at 06:59 ]
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