排序方式： 共有122条查询结果，搜索用时 15 毫秒
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在综合分析城市测绘生产及档案管理信息化现状的基础上,结合勘察测绘业务的具体需求,依据城市测绘业务流程,设计开发了运行在局域网内的城市测绘生产及档案管理系统。本文对该系统的总体架构、与测绘及档案业务密切相关的工作流程模型和档案管理模型进行了详细阐述。系统的建立使得测绘档案管理与测绘日常业务工作相关联,实现了业务管理、日常办公、档案管理及档案利用的一体化,满足了测绘部门日常管理及业务工作需要,是测绘档案现代化管理的有益探索,同时在实践上有利于提高测绘生产部门的管理水平。 相似文献
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Multistep inversion workflow for 3D long‐offset damped elastic waves in the Fourier domain 
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下载免费PDF全文 We present a new workflow for imaging damped three‐dimensional elastic wavefields in the Fourier domain. The workflow employs a multiscale imaging approach, in which offset lengths are laddered, where frequency content and damping of the data are changed cyclically. Thus, the inversion process is launched using short‐offset and low‐frequency data to recover the long spatial wavelength of the image at a shallow depth. Increasing frequency and offset length leads to the recovery of the fine‐scale features of the model at greater depths. For the fixed offset, we employ (in the imaging process) a few discrete frequencies with a set of Laplace damping parameters. The forward problem is solved with a finite‐difference frequency‐domain method based on a massively parallel iterative solver. The inversion code is based upon the solution of a least squares optimisation problem and is solved using a nonlinear gradient method. It is fully parallelised for distributed memory computational platforms. Our full‐waveform inversion workflow is applied to the 3D Marmousi‐2 and SEG/EAGE Salt models with long‐offset data. The maximum inverted frequencies are 6 Hz for the Marmousi model and 2 Hz for the SEG/EAGE Salt model. The detailed structures are imaged successfully up to the depth approximately equal to one‐third of the maximum offset length at a resolution consistent with the inverted frequencies. 相似文献
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Jiayan Zhao Jan Oliver Wallgrün Peter C. LaFemina Jim Normandeau Alexander Klippel 《地球空间信息科学学报》2013,16(4):237-250
ABSTRACTThe availability and quantity of remotely sensed and terrestrial geospatial data sets are on the rise. Historically, these data sets have been analyzed and quarried on 2D desktop computers; however, immersive technologies and specifically immersive virtual reality (iVR) allow for the integration, visualization, analysis, and exploration of these 3D geospatial data sets. iVR can deliver remote and large-scale geospatial data sets to the laboratory, providing embodied experiences of field sites across the earth and beyond. We describe a workflow for the ingestion of geospatial data sets and the development of an iVR workbench, and present the application of these for an experience of Iceland’s Thrihnukar volcano where we: (1) combined satellite imagery with terrain elevation data to create a basic reconstruction of the physical site; (2) used terrestrial LiDAR data to provide a geo-referenced point cloud model of the magmatic-volcanic system, as well as the LiDAR intensity values for the identification of rock types; and (3) used Structure-from-Motion (SfM) to construct a photorealistic point cloud of the inside volcano. The workbench provides tools for the direct manipulation of the georeferenced data sets, including scaling, rotation, and translation, and a suite of geometric measurement tools, including length, area, and volume. Future developments will be inspired by an ongoing user study that formally evaluates the workbench’s mature components in the context of fieldwork and analyses activities. 相似文献
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Nikolas Prechtel 《制图学和地理信息科学》2013,40(3):244-258
3D scenes within all media indicate a societal preference shift toward 3D presentations. In spite of wide data availability and successful standardization efforts in 3D modeling, it is not a standard practice to offer large-scale topographic references to the end user in the form of 3D models. This motivates to propose automated strategies for the generation of closed 3D representations of a complete urban landscape, which at the same time account for capabilities of consumer-class devices. The campus of Dresden University of Technology served as a test case. The final appearance of the 3D model will be steered directly by the original geographic information system (GIS) data source. Such a “schematic model” displays source classes and attributes by nonphotorealistic rendering. A tested generic workflow can be presented, which programmatically integrates attributed 2D GIS entities and digital elevation model data, checks for compliancy with consistency rules and generates a slim geometric model. Only detailed GIS references can be considered to allow close-range visualization as needed in virtual walks. In delegating the geometric processing to automated workflows, playing room is gained for as well innovative as expressive texturing and, thus, design of the final 3D model. 相似文献
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何德平 《测绘与空间地理信息》2012,(6):213-215
测绘司法鉴定作为一项特殊工作,越来越受到重视。但由于其工作流程体系的缺失,存在较大的隐患和风险。本文通过对测绘司法鉴定的法律、标准、原则及工作的法规性研究,总结出测绘司法鉴定的作业流程体系,为此项工作的开展提供了一套可供参考的解决方案,具有重要的实践意义。 相似文献
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基于J2EE架构的工作流引擎的分析与设计 总被引：6，自引：0，他引：6
基于WFMC的工作流管理系统标准模型以及OMG的工作流对象实现模型,进行了基于J2EE架构的工作流引擎的模块设计、数据库设计、对象设计及实现。 相似文献
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建设用地勘测定界功能探讨 总被引：7，自引：0，他引：7
本文以建设项目用地勘测定界(以下简称勘测定界)和审批业务为主线,通过对我国目前勘测定界工作中普遍存在的一些问题的分析,结合本实验室长期对勘测定界管理方法的研究,针对省级国土资源管理部门勘测定界工作内容,对全省建设项目用地勘测定界与审批工作彻底实现流程化、无纸化和自动化所需要采用的关键技术进行分析,探讨了建设勘测定界系统所需解决的问题和系统所需要具备的功能模块和相关技术指标。 相似文献