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The ideal numerical simulation of 3D magnetotelluric was restricted by the methodology complexity and the time-consuming calculation. Boundary values, the variation of weighted residual equation, and the hexahedral mesh generation method of finite element are three major causes. A finite element method for 3D magnetotelluric numerical modeling is presented in this paper as a solution for the problem mentioned above. In this algorithm, a hexahedral element coefficient matrix for magnetoelluric finite method is developed, which solves large-scale equations using preconditioned conjugate gradient of the first-type boundary conditions. This algorithm is verified using the homogeneous model, and the positive landform model, as well as the low resistance anomaly model.

The digital system of Archaeology includes multi-scale non-destructive detection (NDD) of archaeological methods, data mining technologies and the GIS of archaeological detect. Heritage preservation is not just to protect the cultural relics which have been excavated. NDD method could detect archaeological artifacts and clarify the statues of cultural relics buried underground. Due to data mining algorithm we can obtain archaeological information via detection data. Finally, apply GIS technology to achieve the data management and data mining methods integrating. A whole new system of digital archaeology is built on the GIS platform by applying of data mining technology to realize a detection method and archaeological information mapping. The system has provided a complete technical support for the digital archaeologyIndex terms: Archaeology explore, Geographic information system, Data mining CAO Ligang and WANG Xuben, GIS FOR ARCHEOLOGICAL DATA 1348 I. PREFACEThe digital system of Archaeology includes multi-scale non-destructive detection system of archaeological methods, data mining system and the data of archaeological GIS. Apply the nondestructive method to detect archaeological relics buried underground, we can gather data; after that data mining technology will provide information extraction from detected archaeological data; at last through the archaeological GIS data processing, to display the data mining results.The method for archaeological exploration can trace back to single method, and now archaeological exploration always contains multi-method and multi-scale. In 2013, application of multi-frequency electromagnetic profiling in studying the distribution of bronze in Jinsha ruin worship, proving that multi-frequency electromagnetic profiling method is an effective and nondestructive means of assessing the distribution of bronze ware in archaeological ruins [1]. In 2012, analysis of land use change characteristics based on remote sensing and GIS in the Jiuxiang river watershed, proving the effectiveness of spatial data management by GIS [2]. In 1982, the Archaeological Institute of Shaanxi Province applied magnetics, electric and geochemical exploration methods to prove the boundary of the Qin Shi Huang Mausoleum where is an ancient Tomb existing large quantities of mercury inside[6]; in 1987, Shaanxi Provincial Center for Remote Sensing and Aerial Survey cooperated together with Zhao-ling Museum and conducted "Zhao-ling ancient burial sites and positioning of Remote Sensing Research"[10]; in 2004, Chengdu University of Technology, Chengdu archaeological institute and Sichuan archaeological institute together researched both in Jinsha and Sanxingdui ruins also applied electric, magnetic, remote sensing and other geophysical methods to achieve archaeological exploration[4-5]. The data mining method has been applied to the field of archaeological research in recent years. Archaeological data mining is currently and mainly focus on archaeological relic where historical relic clusting and classification be...

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