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Current environment of geo-visualization still has some disadvantages which mainly are: visualization entity model is not easy to be built; system software cannot support rapid modification and effectively reuse of former results; system platform cannot support consistency maintenance of visualization models. The theory and method of variant design, which has a public optimization feature, was proposed...
In Three Gorges reservoir area of China, 3D visualization and analysis functions are widely needed in many works of geological hazard survey, inspection, pre-warning and treatment of local landslides and collapses, and decision making for emergency response. However, current 2D or 2.5D GIS system cannot satisfy all these kinds of requirements and a 3D visualization and analysis system of geological...
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...
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...
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...
Many time-critical applications, such as emergency evacuation, demand decision-makers to make prompt decisions under time pressure. Therefore, it is essential to design an intuitive and interactive user interface to present critical information to users so that they can make effective decisions in time-critical situation. Using Ajax technology, this paper designs a GIS-based, flexible and interactive...
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...
A modified genetic algorithm for global path planning of searching robot in mine disasters is proposed in this paper. The grid model is built based on the mine GIS (Geographic Information System) which can be obtained from the mine in advance. Using the position information feedback from the Ant Colony Optimization and priority grouping, we present a new efficient method to generate the initial population...
This paper reports the development of an expert system for fruit tree disease and insect pest diagnosis based on artificial neural network (ANN) and geographic information system (GIS). A multiple knowledge acquisition approach was adopted, consisting of interview expert, questionnaire, Web-based search and literature review. The production rule was adopted as the formation of knowledge representation...
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