Study Of Reference Model And Key Technologies Of Geological Information Services

With geological data playing more and more important role in many applicationsincluding energy exploration,mining, large-scale infrasctructure construction, disasterrelief and other related displines.The Ministry of Land and Resources explicitly putforward the promotion of geological data information service clustering andindustrialization with the goal of improving service levelsof data analysis, which is animportant task facing the country and the majority of geologists.In this paper, based on the special topic of the key technology and systemframwork of geological information service clustering and industrialization, weelaboratethe existing problems of geological information service, and thenwe analyzetheories and technologies about information service mode,data integration andfustion,sharing and interoperation. Finally we present a novel open refrence model ofgeological information service—GeoIOR(Geological Information Open Reference).The results presented in this thesis are as follows:(1) In order to provide an overall framework and high-level design guidance forthe technology research and application of the geological information service, thisresearch introduces an open reference model of geological information service(GeoIOR), and describes its logic architecture and technology series.(2) Based on the GeoIOR reference model, the collection method of real-timeintegration of spatial data was studied. Based on the analysis of the spatial distributionand engery consumption of the sensing devices which have integrated real-timespatial information, we propose an EnerGy-eFficency index tree (EGF-tree) for datacollection and aggregation, especially for the situation when sensor nods aredistributed unevenly. We havedeveloped a prototype to verify the applicability of thisEGF-tree and its collection strategy.(3) Based on the GeoIOR reference model, the geospatial service and text servicewere discussed. According to the heterogeneity and multi-source of geological spatialdata, we realized the integration management for these data with Oracle Spatialcomponent and middleware, and implemented a lightweight WebGIS system of vectorspatial data about national geological map.(4) Combined with Chinese word segmentation technology, mutual information,C-Value and TF-IDF algorithm, a method of geological term extraction is designedand implemented. Base on this technique and Lucene, a web service prototype systemof geological full-text retrieval is constructed.(5)Based on the GeoIOR reference model, the method of service discovery wasdiscussed. According to the Web service model and its discovery mechanisem, areal-time service organization model which includes function discription, time andspace constraints is proposed, and a method for service discovery is presented whichis based on the semantic analysis and spatiol-temporal index analysis. Through theexperimnts, we proved the feasibility of the method, and achived the expected results.