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Landslide Cartography at the Region of Nabeul-Hammamet Based on Geographic Information System and Geomatic

International Journal of Geosciences 2016年第9期7卷 1088-1101页

作者： Romdhan Haddad Mariam Labiad Mohamed Khaled Bouzid Rym Rabia Dallel Makloufi Mohamed Chedly Rabia ur11es41 geomatics and geosystems University of Manouba Manouba Tunisia Faculty of Sciences Bizerte Zarzouna University of Carthage Carthage Tunisia

Landslides are one of the most significant natural damaging disasters in hilly environment [1]. The location of our study area is to the north of Tunisia, home to several manifestations of land instabilities, we bring to study this area of interest by GIS and geomatic approach to reduce social economic losses due to landslides. The performance of a cartographic data base for the landslide study in the Cap-Bon region was realized through studying geologic 1/50,000 and topographic 1/25,000 maps, aster optic Remote Sensing, land observation, and climatologic seismic data. These data will be digitalized, georeferenced, vectorized, spatially analyzed, classified and geotreated in order to produce a landslides card. The findings have shown that fields with smooth and friable lithology which are located at rather important seismic zones (more than 4 at Richter’s scale) have some stability. However, the most endangered zones are in the North-West around Oued El Kbir and El Ain. Realizing this work helps to determine the most hazardous zones so that policy makers have an effective field intervention.

关键词： Cartography GIS Geomatic Landslide Nabeul-Hammamet

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Geophysical Investigation of the Triassic Salt Material Hazard: El Fahs Case Example (Northern Tunisia)

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International Journal of Geosciences 2020年第11期11卷 729-744页

作者： Mohamed Khaled Bouzid Adel Klai Romdhane Haddad Mohamed Chedly Rabia Faculty of Sciences of Bizerte University of Carthage Tunis Tunisia Research Laboratory “geomatics of geosystems” LR19es07 Faculty of Letters Arts and Humanities of Mannouba Mannouba University Manouba Tunisia

The Tunisian territory (area of diapirs) is exposed to the risks of ground movements linked to water, some of which are related to the phenomenon of dissolution of gypsum, allowing the appearance of underground cavities which present natural risks and set people in danger. The analysis of the hazard was determined by the field study coupled with the application of geophysical methods to locate and map the cavities and identify their dimensions and their positions in the subsoil. In the region of El Fahs (40 km NW of Tunis): we used a non-destructive method, georadar (GPR) with a 200 MHz antenna band-width, and an electric method, by using the electric tomography of which we have applicated the sequence of dipole-dipole measurement. The results ob-tained were examined and interpreted according to 2D profiles. The geophysi-cal methods of GPR and electrical tomography aim to detect many calvities in different depths. However, the geological radar was able to identify several cavities and the zones of dissolution whose investigation depth did not exceed the first 3 meters. On the contrary, the electric tomography method allowing the presence of several deeper underground cavities with larger dimensions ex-tended to 64 meters. To conclude, the geological and hydrogeological contexts of the terrain studied and on the state of the soil and subsoil allow us to better understanding the mechanisms of the establishment of the dissolution phe-nomenon and the appearance of cavities in the basement. The analysis of the predisposing factors present in the study area shows that the geodynamic con-text of the Triassic ascent takes place according to a precise thermodynamic process that favors the phenomenon of dissolution of the gypsum.

关键词： Triassic Materials Natural Hazards Underground Cavities Thermodynamic Process GPR Electric Tomography

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Geoinformatics education and outreach:looking forward

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Geo-Spatial Information Science 2017年第2期20卷 209-217页

作者： Jianya Gong Peng Yue Tsehaie Woldai Fuan Tsai Anjana Vyas Huayi Wu Armin Gruen Le Wang Igor Musikhin State Key Laboratory of Information Engineering in Surveying Mapping and Remote SensingWuhan UniversityWuhanChina School of Geosciences University of the WitwatersrandJohannesburgSouth Africa Center for Space and Remote Sensing Research National Central UniversityTaiwanChina Centre for Advanced geomatics CEPT UniversityAhmedabadIndia Chair of Information Architecture Photogrammetry and Remote SensingET H ZurichZurichSwitzerland Department of Geography The State University of New York at BuffaloBuffaloNYUSA Department of International and Innovation Activities Siberian State University of Geosystems and TechnologiesNovosibirskRussia

Geoinformatics education is a key factor for sustainable development of geo-spatial sciences and *** have been a variety of educational activities focusing on education and training,technology transfer,and capability building in photogrammetry,remote sensing,and spatial information science,together known as *** education is an essential mission and even determinant in the ISPRS *** paper discusses key issues in Geoinformatics *** reviews educational activities from the ISPRS perspective and summarizes lessons learned from these actions.A vision towards future trends of Geoinformatics education in the ISPRS is provided.

关键词： Geoinformatics education and training E-learning summer school

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WebGIS在美国南加州数字城市建设中的应用实例分析

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测绘与空间地理信息 2005年第5期28卷 15-17页

作者：杨昆张光宇云南师范大学地理信息科学系云南昆明650092 MRF geosystems Corp

从介绍W ebGIS技术在南加州一个成功应用项目———加州橙县土地公共文档查询显示和电子商务系统的技术路线和体系结构入手,分析了当前几个主要W ebGIS软件的基本特点和存在的技术问题。在此基础上,引入了可以改善目前W ebGIS技术领域... 详细信息

从介绍W ebGIS技术在南加州一个成功应用项目———加州橙县土地公共文档查询显示和电子商务系统的技术路线和体系结构入手,分析了当前几个主要W ebGIS软件的基本特点和存在的技术问题。在此基础上,引入了可以改善目前W ebGIS技术领域内弊端的一种新方法———基于SVG矢量图形格式的W ebGIS技术,同时给出了这一技术的基本思路和优点,并通过系统的开发实践证明其响应速度、功能与图形效果。这一W ebGIS应用展示了基于SVG格式的W ebGIS技术的强大活力。通过与其他系统的无缝集成,如与电子商务系统,文档管理系统,以及办公自动化系统等,W ebGIS将GIS技术的应用推上一个新台阶,使得GIS技术在数字化城市的建设中发挥更大的作用。

关键词： SVG WebGIS 数字城市

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