| 基于MAPGIS的分形方法确定化探异常 |
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| 关键词:Geographical Information System (GIS) fractal fractal dimension geological anomaly |
| 基金项目:中国地质调查局综合研究项目(编号:20010200015) |
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| The Determination of Thresholds by the Fractal Method Based on MAPGIS |
| The determination of thresholds of chemical elements is an important problems in geochemical exploration. At present, there is not a satisfactory scientific way to confirm the thresholds. The traditional way of determining thresholds of chemical elements is based on the assumption that chemical elements are in normal distribution or element contents are continuously changed in space. Nevertheless, the spatial distribution of chemical elements is extremely complicated, and researches show that geochemical landscape may be a chaotic system of low dimension. The background and anomaly values of elements usually show independent power index relationship, resulting in the multifractal distribution of chemical elements. We can therefore use the fractal method of chemical elements to determine thresholds. Several fractal methods for determining thresholds of chemical elements often compute r of different scales and the corresponding number of N(r) . Geographical Information System (GIS) can realize dynamic inquiry and attribute analysis of figure units, and hence GIS is very suitable for statistic analysis of r of different scales and corresponding N(r) . So we can combine the fractal method with the geographical information system. With MAPGIS geographical information system designed by Wuhan Zondy Info-Engineering Co. Ltd. as an example, This paper deals with the determination of thresholds of chemical elements by using fractal methods based on GIS platform. The results obtained are compared with those obtained by traditional methods. The traditional methods for determining thresholds require pretreatment of original data and consideration of practical geological setting. However, the operation of the fractal methods based on MAPGIS platform is very simple and not affected by abnormally high values. Therefore, the fractal methods are less affected by artificial interference. A comparison with the traditional methods has led to the conclusion that the fractal method is an effective method for determining thresholds of chemical elements. |
| LI Sui-min,YAO Shu-zhen.2005.The Determination of Thresholds by the Fractal Method Based on MAPGIS[J].Acta Geoscientica Sinica,26(2):187-190. |
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