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From 2003 to 2010, in the due process of carrying out the Project of “The Remote Sensing Survey and Monitoring on National Entironmental and Geological Backgrounds”, the National Entironmental and Geological Information System for Remote Sensing Survey and Monitoring (Known as “NEGISRSSM”) was established to meet the demand of result data management and application. The System consists of 11 functional...
This paper presents a benchmark consisting of 11 queries based on WFS standards formulated by OGC. The purpose of our study is to provide a reference standard, when the performance test is conducted on a geospatial web service platform which supports OGC WFS. This benchmark has the novel characteristic that it uses geospatial datasets and queries that are representative of WFS. We selected GeoServer...
Three-dimensional visualization has become the development trend of geological information technology, which will inevitably lead to the sharp increase of geological spatial data. However, the inherent characteristics of underground geological data, such as invisible, non-parametric, unstructured and non-homogeneous, lead to great difference between underground geological data and ground surface data...
Becoming development trend of GIS, three-dimensional visualization makes the amount of spatial data grown inevitably. Therefore, the study on storage and management of massive three-dimensional geospatial data is necessary and significant. The C/S framework, which consists of massive three-dimensional geospatial database for server and a large number of low-profile PC for clients, has become a basic...
Log management module plays an important role in the massive spatial database management system. Recently there are few three-dimensional spatial database management systems with pertinent log management sub-system, or the administrator can only use the log, which is attached by database system, to recover the data. To improve this issue, hierarchical structure of the log management module should...
Log management is essential to register the three-dimensional spatial data. It plays the role of auditing and monitoring in the system. The traditional method of log management is to set up a management module which records the users' manipulations respectively for each function. Though it's easy to apply such a management system, it consumes more time and energy. Another method is only to use the...
Large scale three-dimensional spatial data of underground and aboveground entity has features of different shapes, uneven spatial distribution and complicated spatial relationships. At present, the single spatial index structure can not satisfy the large scale three-dimensional spatial data organization and management. Especially for the index of the elements with information retrieval LOD, its efficiency...
Traditional substitution algorithms for cache management are more unitary, and basically each algorithm only has correspondingly good effect on certain type of access pattern. Based on analyzing the characteristics of spatial data, a new approach is proposed for cache replacement, considering both frequency and the duration of hit comprehensively. The criterion function of substitution algorithm can...
Spatial entities and the relationships between them in real world are changing over time, and the demands from continuous updating of all kinds of data are improving constantly. Therefore, how to maintain the current trend of spatial database becomes increasingly important. However, the spatial data, which exhibit the further feature of massive data, multilevel, concurrent operation of multi-users,...
Because of the continue progress of spatial data acquisition technology and the rich data collection methods, spatial data growth as explosive speed, so the research on spatial data storage models has become a breakthrough. In this paper the concept model of spatial data storage is abstracted into geometry layer, attribute semantic relationship layer and core layer, the former supplies the representation...
How to create high-performance true three-dimensional spatial index for the complicated geological scene to ensure the effective storage management and dispatching of the TB-class mass complicated geological scene data is one of the key technical issues of the 3DGIS, which needs to be resolved urgently. The inefficient space division and the high rate of index node overlap problems will appear in...
One issue of GIS is management of huge amount of spatial data. Nowadays, acquisition capacity of 3D spatial data with various scales and resolutions is much more convenient due to new 3D acquisition technologies. It is a difficulty that how to efficiently and synthetically organize and manage large scale underground 3D spatial data with contents of continuous distribution and nonuniformity. A 3D GIS...
Sorts of models in current geological hazard information management system and digital disaster reduction system (DDRS) in China still lack of enough basic data support. One key problem is how to realize integration and share of complex geological hazard heterogenous spatial information. Isomerous geological hazard data have four types: structural isomer, syntax isomer, system isomer and semantic...
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