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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...
It is important approach to recognize natural evolution of environment on the Chinese Loess Plateau that researches on evolution of loess landform and soil erosion in the Holocene. In this study, radiocarbon age of soil, loess deposition rate and magnetic susceptibility soil from YCT and YCS profiles which respectively located on loess tableland and an adjacent slope in Yanchang County in northern...
Soil loss tolerance should consider the conservation of the soil as a natural resource. Erosion rates greater than loess deposition rate will cause soil depth loss. However, loess deposition rate must be determinable or predictable before they can be used as criteria for setting soil loss tolerance limits. In this study, radiocarbon dating was used to quantitatively study loess deposition rate in...
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...
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...
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...
Isomerous geological hazard data have four types: structural isomer, syntax isomer, system isomer and semantic isomer. Interoperability of semantic heterogenous data is a difficult issue due to its complexity and implication. Ontology not only describes exactly the meaning of concepts but also inner relationship of the concepts. So ontology can efficiently express common knowledge of specific domain...
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...
Through the simulation of oil and gas migration and accumulation, the intensity and quantity of these geological processes can be worked out quantificationally. In this approach the process and location of migration are shown visually to support the decision-making of oil and gas exploration. The model of oil and gas migration and result dynamic visual representation are two difficult problems of...
One trend of oil and gas prediction and evaluation is computer-aided quantitative approach. Aiming at complicated factors and numerous parameters of oil and gas resources estimation, the method with combination of geological analogy model and probabilistic model and corresponding flowcharts were introduced. The quantitative estimation process was performed by using Delphi method and Monte Carlo calculation...
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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