Research On Key Technologies Of Underground Space Data Resource Management System

Urban underground space resources are an important part of the city resources.In large and medium cities in China,growing shortage of land resources,serious shortage of urban land,become an inevitable trend of development of underground space resources.Underground space with legislative work and related standards issued,as well as the rapid development of information technology,building underground spatial data resource management system,implementation of geological formations,underground pipelines,underground railway and underground spatial information management,improve underground space development and utilization efficiency,accelerate infrastructure construction,promoting the process of digital cities,is of great significance.Based on classification and codification,data modeling,analytical storage and retrieval efficiency aspects of the database of underground space is studied,and,ultimately,based on the database and B/S system structure,established underground spatial data resource integrated system realizes data resource of underground space to browse,query,retrieval and statistical services,prepare for future further data sharing.The main results are as follows:On the classification and coding data resource of underground space.Proposed will underground space data resources is divided into "underground space facilities" and "underground space engineering" two big class,and based on this,reference existing of industry and national standards,on underground space data resources for has integration,makes classification range not only covers all underground space facilities,and also has data object of geological survey engineering,and measurement engineering,civil air defence involved into the classification coding system;Build metro measurement engineering,geological drilling,underground pipeline,and Civil defense in areas such as space object corresponds to the GML application schema file,then according to the XSD schema file to instantiate XML files,instance data is stored in XML files.Based on db4 o database engine and VTD-XML technology,design GML analytical device,achieved has according to a a data of GML application mode file,can analytical corresponding of XML instance file,extraction file in the of data information,and put it into db4 o database in units of element;space retrieved functionh as achieved based on db4 o database,paper according to Guo Wei,scholars proposed of theory,design and achieved QR-tree space index,Theoretically and experimentally assessed the performance of QR-tree.Conclusions that QR-tree spatial index performance is related to the Q-tree depth and R-tree node capacity;based on underground spatial database and B/S system structure underground spatial data resource management platform has been built.Implementation of underground space object to browse,query,search,statistics features.Lay the Foundation for further sharing of data between different systems.