共查询到10条相似文献，搜索用时 93 毫秒
1.
简要介绍了几种主要钻孔轨迹数学模型。将4个钻孔的测斜数据代入不同的钻孔轨迹数学模型中，并将运算结果与4个钻孔深部被揭露点的坑内实测坐标进行对比，结论是不同钻孔轨迹数学模型对钻孔的定位差异给地质作图不构成重大影响。 相似文献
2.
简要叙述了现行航空摄影测量的作业模式和关键技术要求,分析了直接利用航摄像片外方位元素恢复立体模型所得到的目标点物空间位置精度以及模型点的上下视差。经对带有双频动态GPS数据的1∶2 500～1∶60 000各种摄影比例尺的覆盖多种地形航摄像片的试验表明,由摄影测量加密所获取的影像外方位元素可直接用于4D产品生产中的影像定向,而由POS系统提供的影像外方位元素还难以直接用于摄影测量测图。
相似文献
3.
地质剖面图可以清晰反映图区内地层、岩体、构造的空间分布特征,对于认识各种地质体和矿床赋存的地质条件和时空分布规律具有重要的意义.在GIS环境下对数字地质图开展图切剖面软件的研究和开发是一项基础且重要的工作,图切地质剖面图不仅可为地质工作者认识地质特征提供基础图件,还可成为三维地质填图基础数据来源.介绍了基于MapGIS的地质图切剖面软件的系统设计方案,深入探讨了图切地质剖面软件研发中的面向对象设计方案,成功实现了面向对象的图切剖面的自动生成及交互修编功能.所研发的制图技术高效实用,能够满足各种比例尺的MapGIS地质图图切剖面的编制要求. 相似文献
4.
Object models are widely used to model the distribution of facies in a reservoir. Several computer programs exist for modelling fluvial channels or more general facies objects. This paper focuses on a marked point model with objects that are able to orient locally according to a vector field. In this way, objects with locally varying curvature are created. With this kind of objects it is possible to model complex depositional basins, that are not easily modelled with conventional methods. The new object type is called Backbone objects. The objects have a piecewise linear centerline and are able to follow the direction of a three-dimensional vector field locally in lateral and vertical direction. How well the objects follow the vector field is determined by three parameters. Use of different coordinate systems and mapping between the systems make it possible to generate Gaussian random fields that follow the shape and direction of the objects. The Gaussian fields can be used to model petrophysical variables, which is important for fluid flow modelling. 相似文献
5.
Suman Paul Rima Chatterjee 《International Journal of Coal Geology》2011,87(2):87-96
Accurate prediction of in-situ stress directions plays a key role in any Coal Bed Methane (CBM) exploration and exploitation project in order to estimate the production potential of the CBM reservoirs. Permeability is one of the most important factors for determination of CBM productivity. The coal seams in Jharia coalfield generally show low permeability in the range of 0.5 md to 3 md. To estimate the in-situ stress direction in the study area, an attempt has been made to undertake the cleat orientation mapping of four regional coal seams of two underground coal mines located at south-eastern part of Jharia coalfield, India. Cleat orientation mapping is critical to determine the maximum principal compressive horizontal stress (SH) direction for CBM exploration and exploitation, which in turn controls the direction of maximum gas or water flow though coal beds. From the field study it is found that the average face and butt cleat azimuths are towards N15°W and N75°E respectively. Average permeability of the four above-mentioned major coal seams has been calculated from well logs of nine CBM wells distributing over an area of 7.5 km2, adjacent to the underground mines. The cleat orientations are congruous with the regional lineament pattern and fits well with the average permeability contour map of the study area to infer the orientation of in-situ maximum horizontal stress. Goodness of fit for the exponential regressions between vertical stress and permeability for individual coal seams varies between 0.6 and 0.84. The cleat orientation is further validated from the previous fracture analysis using FMI well log in Parbatpur area located southern part of the Jharia coalfield. The major coal seams under the study area exhibit directional permeability, with the maximum permeability, oriented parallel to the direction of face cleat orientation. 相似文献
6.
Using the tight connection of direct geolocation technique and large-scale digital aerial photography system, the authors carried out the high-precision aerial remote sensing survey in Binhai New Area of Tianjin and Caofeidian New Area of Tangshan, West Bohai Bay. The application of uncontrolled point technology gets rid of the dependence on the base station for aerial remote sensing, and also overcomes the shortcoming of the rarity of ground stations in the surrounding areas of the coastal zone. Utilizing the 0.3 m high-resolution true-color aerial photography images and high-precision positioning and orientation elements, the authors have successfully constructed the Digital Elevation Model (DEM) and Digital Orthophoto Map (DOM), which meet the requirements of 1:10 000 scale indexes in plane and altitude. These fill the gap in the basic geological information of high-precision aerial remote sensing in Binhai New Area and the intertidal belt of Caofeidian Coastal Zone. On the basis of high-resolution satellite data, remote sensing interpretation has been used for land type classification and coastline extraction, which provides detailed and reliable geographic information for the thematic maps of remote sensing geological interpretation, geological ecological environment and disasters. The results show that the application of tightly coupled airborne position and orientation system (POS) and uncontrolled technology shortens the mapping cycle of DEM and DOM, reduces a lot of ground measurement workload and saves manpower and material expenditure. The research can provide some new technical support and working ideas for geological survey in coastal zone working areas. 相似文献
7.
运用直接地理定位技术和大幅面航空数字摄影系统的紧密捷联,开展渤海湾西部天津滨海新区和唐山曹妃甸新区的高精度航空遥感调查工作。无地面控制点技术的应用摆脱了航空遥感对基站的依赖,也克服了海岸带周边地区地面基站稀少的局限。利用获取的0.3 m高空间分辨率真彩色航摄影像和高精度定位定向元素,成功构建了平面与高程均符合1:10 000比例尺指标要求的数字高程模型(digital elevation model,DEM)和数字正射影像图(digital orthophoto map,DOM),填补了天津滨海新区和唐山曹妃甸新区海岸带潮间带高精度航空遥感基础地质信息的空白,同时结合高分卫星数据,在土地类型分类、海岸线提取等方面开展了遥感解译应用,为进行遥感地质解译、地质生态环境与灾害等要素的专题图制作提供详实可靠的地理信息基础数据。研究结果显示,紧耦合机载定位定向系统(position and orientation system,POS)无控技术的运用缩短了DEM和DOM成图作业周期,减少了大量地面测量工作,节约了人力和物力支出,为海岸带工作区开展地质调查提供了新的技术支撑和工作思路。 相似文献
8.
中美合作东昆仑造山带地质填图的启示：填图理念与填图方法 总被引：2，自引：2，他引：0
在中美合作东昆仑造山带地质填图实践的基础上,结合美国地质调查局（USGS）最近完成的地质填图实例的对比分析,初步总结和探讨了美国的地质填图方法和填图理念。结果表明,尽管地球物理和3S技术在地质填图中的应用不断推陈出新,但是地质填图理念、地质填图方法和地质报告风格自USGS成立以来未曾改变。“对所有地质实体按岩性进行划分和详细填图”的地质填图理念伴随USGS走过了130年曲折而艰难的历程。“地质现象引导地质路线”的填图方法是美国地质填图长期采用的方法,但应用于澳大利亚厚层风化壳和加拿大冰雪覆盖区的高精度地球物理填图方法并没有应用到造山带地质填图中,而遥感技术成为造山带基岩区填图的重要技术支撑。美国基岩区高效的地质填图速度并不能用高精度地球物理和遥感技术的应用来解释,已有地质成果的继承与利用、填图工作模式、填图与科学研究的合理定位、简明地质报告和GIS的地质应用才是决定地质填图速度的关键因素。 相似文献
9.
专题地质填图及有关问题讨论 总被引：2，自引：1，他引：1
面积性地质调查及填图是今后地质调查的主要工作,如何做好这个工作,并实现地质调查和科研一体化,特别是在已有填图基础上,如何部署和开展新的填图工作,是一个亟待回答的新问题。专题地质填图是针对存在的重要地质或资源、环境问题,或是针对特定目标地质体等,以解决特定问题或满足社会特定需求为主要目的、填图与研究融为一体的地质填图,填图的范围和比例尺依据解决问题和目标地质体而定。专题地质填图是以问题和需求为驱动,是对已有的综合地质填图的补充和提高,是高效实现地调科研一体化的一种方式。论述了专题填图的内涵、必要性,以及开展专题填图的方式和方法。 相似文献
10.
新时期下信息化测绘技术的发展 总被引：2，自引：0，他引：2
随着信息社会的到来,测绘也将进入信息化测绘阶段。走信息化测绘发展道路,推进测绘信息化发展,是信息社会对测绘发展的基本要求。根据测绘信息化的主要任务与建设原则,探讨了目前政府测绘部门在向信息化测绘发展方面需要面对和解决的几个主要问题。 相似文献