Research on China Western Spatial Data Quality Check and Evaluation Technique System

The national western spatial data quality check method based on entity and evaluation method based on the cloud theory and rough set have been put forward according to the National Western Surveying and Mapping Project on 1:50000 Topological Maps Blank Area. In the first place, national western spatial data quality problem is analyzed and possible quality problems are described. Secondly, a digital linear graphic spatial data quality model is built and the quality elements and sub-elements are elaborately summarized. Next, spatial computing operators that the check process demands are given. Each concrete check rule is comprised of the union of different computing operators. And then, all check rules constitute spatial data quality check rules database. In the forth place, the weight of each index is calculated according to importance of attribute in rough set. Cloud decision generator transforms indexes value into qualitative evaluation. Finally, the homologous software of the spatial data quality check and evaluation is developed to control spatial data quality. Therefore a complete spatial data quality control and evaluation technique system is founded. It shows that the check and evaluation methods are feasible and software has higher automation from the experiment. The research is financially supported by sub-project of Western China Surveying and Mapping: Comprehensive Database Construction and Data Quality Checking Software