Knowledge Acquisition Interface 
  
  
  
  
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Basic Knowledge 
  
Medium Knowledge 
Advanced Knowledge 
  
  
  
  
  
  
  
  
  
  
  
  
  
Acquisition Acquisition Acquisition 
A M D A A M D A A M D A 
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Basic Knowledge Base| |Medium Knowledge Base| |Advanced Knowledge Base 
  
  
  
  
Fig. 5 The structure of GKBMS 
base on the data in the database and gains 
the conclusion. This means that the inference 
is a strategy program composed of  inference- 
control algorithms and knowledge-search 
algorithms. 
By the use of the rules in the geographical 
knowledge base, the inference engine in the 
MCGES can match, calculate the data in the 
MCGIS (Global Data Base) to gain solution on 
the geographical problems with unknown model. 
This module can also provide reverse real- 
time explanation for the processes and 
results. 
MCGES adopts product ion-strategy in 
reasonning. 
In accordance with the three-level in 
knowledge, a complete inference procedure is 
composed of operations in three levels. 
(1) Basic inference 
Use the knowledge in the first level to match 
values of factors, and grade the factors; 
(2) Medium inference 
Based on the conclusion of the basic 
inference and the medium knowledge (rules) to 
classify the integrated geographical factor; 
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3. THE APPLICATION AND EVALUATION OF MCGES 
MCGES is successfully used to solve many 
problems of soil and water conservation 
planning in Kouhe,a district in Liuhe valley, 
Inner Mongolia Aotonomy Region. 
Useing following data and knowledge: 
(1) topographical map of Kouhe, 1:100,000, 
(2) geo-code Model map of Kouhe, 1:100,000, 
(3) GCM rank table of Kouhe, 
(4) erosion type classification rules, 
(5) a new Erosion intensity model, 
(6) soil and water conservation experience 
measures, 
MCGES can gain following results: 
(1) single factor output: value and map of 
slope, aspect, average slope, soil type, 
soil depth, gully density, vegetation 
coverage etc. 
(2) integrated factor output: value and map 
of erosion intensity, suggests and maps 
of soil and water conservation 
measurement etc. 
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