Spatial Data Checking with Generalization Knowledge
Jiayao Wang · Acta Geodaetica et Cartographica Sinica · 2006
Spatial data checking with generalization knowledge is an exigent problem to be researched in GIS and cartographic generalization.Firstly,analyze the importance of data checking,and the effect of generalization knowledge on it. Secondly,expounding the process of summarizing generalization knowledge.After analyzing this field's current research,a classifying knowledge model based on fuzzy knowledge and accurate knowledge is defined.Based on the above,a generalization knowledge structure is put forward.Then,a concept of knowledge attribute and its particular targets are brought forward which is important during using generalization knowledge.Thirdly,introducing the whole process of data checking based on generalization knowledge.After ordering the sequence of data layers by weightiness,a synergic data checking method based on fuzzy knowledge and an automatic data checking method based on accurate knowledge are created.With these methods,generalization tasks are described as generalization flow-programs,which can be executed by computers.Lastly,an example is shown.Its result illustrates that each of the cartographic generalization's needs is satisfied with the data checking model introduced above.This checking method with knowledge can provide valuable information and the gist for generalization operation and process.