Mine Dynamic Monitoring and Integrated Management Based on RS and GIS

The development of mineral resources is accompanied by serious threats to the geological environment in China. In order to balance mining order, mine environmental protection and ecological restoration, this article examines a case study of Ningwu mining area and proposes an accurate method for mine dynamic monitoring in mining area based on remote sensing (RS), which is a series of technical processes with RS images selection, mine development situation and dynamic monitoring which includes areas change and types transfer. Findings indicate that the area of bauxite pit, bauxite and coal dump increased, the area of coal industrial square decreased, coal dump and industrial square mainly transferred into bauxite pit. The organization and storage model were discussed for results integrated management by spatial database engine (ArcSDE).The application of results retrieval was developed by GIS components. This method can be considered as an effective approach for a wide range of mine development monitoring in mining areas in China.

A Spatial Database Management System for Urban and Rural Planning

The data management of urban and rural planning is very important and special. It is quite necessary to customize a thematic database system for urban and rural planning. According to their characteristics and classifications, the requirements of this system are firstly analyzed in this paper. With the integration of traditional relation database management system and geographical information system, an extendable data model for this thematic database is proposed. In this model, Client/Server architecture is adopted, Oracle is extended to store both attribute data and spatial data, and spatial database engine is utilized to access the spatial data in Oracle. At the client side, some functional modules such as data import and export, browse and display, query and retrieval, update and maintain, and security management are designed and developed. Finally, a case study of the thematic database system is applied. It is concluded that the customized spatial database management system for urban and rural planning is not only able to unify and store all types of data, but also able to improve the efficiency and visualization.

A Multi-Level Cache Approach for Realtime Visualization of Massive 3D GIS Data

The real-time visualization of 3D GIS at a whole city scale always faces the challenge of dynamic data loading with high-efficiency. Based on the multi-tier distributed 3D GIS framework, this paper presents a multi-level cache approach for dynamic data loading. It aims to establish in 3D GIS spatial database engine (3DGIS-SDE) the unified management mechanism of caches on three levels, including: the client memory cache (CMC) oriented to sharing application, the client file cache (CFC) organized by index, as well as the application server memory cache (ASMC) of structural consistency. With the help of the proposed optimized cache replacement policy, multi-level cache consistency maintenance as well as multithread loading model designed in the paper, the engine is able to adaptively make full use of each-level caches according to their own application properties and achieve effective coordination between them. Finally, a practical 3D GIS database based on Oracle 11g is employed for test. The experimental results prove this approach could satisfy multi-user concurrent applications of 3D visual exploration.