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排序方式: 共有102条查询结果,搜索用时 15 毫秒
31.
在分析了青藏体北缘跨以形变测量场地图形状态的基础上,论述了进行优化设计的必要性及新的图形设计的主要内容:(1)以GPS控制整个断裂、以水冷、测距、基线、重力等测量手段监测各个场地测点形成的三维地形物重力变化信息;(2)断层水准、重力按新的标石裂线阵设;(3)断层水平形变可根据运动状态的不同,按“走滑型”和“倾滑型”布设;(4)场地水冷、重力定期水准、重力联测,场地水平没距网定期与区域GPS网联测, 相似文献
32.
水位传感器与单片机智能遥测终端相配合设计的计量用水智能监测系统可以通过电话线,将计量用水信息远程数传到监控中心,并在监控中心生成各种图文、报表。通过对图文、报表的分析,实现对智能遥测终端的远程监控。该系统将在水利建设中发挥重要作用。 相似文献
33.
Jason K Blackburn rew Curtis Frances Currin Mujica Farrell Jones Patricia Dorn Rosamond Coates 《Transactions in GIS》2008,12(2):249-265
This article describes a web‐based data entry and GIS‐driven mapping system designed for an ethnographic and entomological survey of Chagas’ disease, an emerging zoonotic disease, and Triatoma dimidiata, a primary vector, in the Los Tuxtlas region of Veracruz, Mexico. To better understand this disease in the region, a collaborative, multi‐disciplinary study was initiated to conduct a spatial investigation of T. dimidiata and a community‐by‐community survey of local perceptions of the disease. In order to facilitate such a collaborative effort the CODES‐GIS was developed. This system allows for (near) real‐time mapping, analyses, disease reporting, and results sharing. CODES‐GIS provides a framework for a research team working in a remote area with limited technology, software, or GIS expertise to benefit from (near) real‐time spatial analyses performed at collaborating institutions. The system is bi‐directional, where field personnel can upload data to the system for field‐based map production. Likewise, laboratory personnel can upload diagnostics data for viewing by field personnel. In this way, the system provides a virtual link between the field and the laboratory to increase the speed at which results are returned to the local community. The CODES‐GIS is described along with a selection of study results. 相似文献
34.
为了保证地震观测台站的正常运行,解决当前台站动行观测系统存在的抗干扰性不高、观测结果与实际结果不一致,资源利用不足及工作效率不高等问题,利用多种技术相结合的方式,设计一套集设备管理、地震观测无人值守台站信息采集、信息通讯、信息管理与应用为一体的地震观测无人值守台站信息智能化观测系统。考虑到地震观测台站工作任务的特殊性,分析台站运行状态观测系统应具备的功能;为了实现实时监测、及时抢修以及远程操控,采用具有双通道可切换的12 V稳压直流电源和UPS作为观测系统供电设备,采用有线、无线双线路备份的方式集成网络通信系统,并实现人机交互设计;在此基础上,重点设计包括用户管理、值班工作管理、台站设备管理、台站运行状态观测、故障预警以及故障派单及抢修等系统软件部分,完成系统设计。性能测试结果表明,设计系统能够在网络中断时继续保持信息传输连续率,工作效率较高,具有较强的抗干扰性、稳定性和可靠性,同时没有造成较大的资源浪费。 相似文献
35.
GIS应用现状及发展趋势探讨 总被引:10,自引:1,他引:9
作者在文中简要介绍GIS一般功能的同时,综述了GIS的应用现状。在此基础上,讨论了传统GIS、分布式GIS(C/S)和WEB GIS系统的集成策略及其优缺点,指出WEB GIS系统集成将是GIS系统在21世纪的发展趋势。 相似文献
36.
V. Araa A. Felpeto M. Astiz A. García R. Ortiz R. Abella 《Journal of Volcanology and Geothermal Research》2000,103(1-4)
The island of Tenerife is volcanically complex, and its eruptive history predominantly reflects the processes and products of two different eruptive styles: (1) non-explosive effusions of basaltic lavas from fissure vents mostly aligned along two ridges; and (2) less frequent but explosive salic eruptions from central vents associated with the Las Cañadas volcanic edifice and associated summit caldera. We have taken into account this fundamental distinction to develop a volcanic-hazards zonation (for lava flows and ash fall only) that includes: definition of the principal hazards; identification of the areas that have higher probability of containing emission centres; and numerical modelling of the vulnerable areas to be affected by volcanic hazards. Not only does the volcanic-hazards zonation map provide emergency-management officials with an updated assessment of the volcanic hazards, but it also represents a starting point for the preparation of a volcanic risk map for Tenerife. Finally, the hazards-zonation map also furnishes the basis for the design of a proposed volcano surveillance network. 相似文献
38.
Numerous measurements of CO2 degassing from the soil, carried out with the accumulation chamber method, indicate that in the period April–July 1995 the upper part of the Fossa cone released a total output of 200 t d–1 of CO2, which corresponds to approximately 1000 t d–1 of steam. These large amounts of fluids are of the same order of magnitude as those released by the high temperature fumarolic
field located inside the crater. The spatial distribution of soil gas fluxes shows that the main structures releasing CO2 are the inner slopes of the crater and a NW–SE line, located NE of the crater rim, which correspond to the main direction
of Vulcano Island active faults. The comparison of the φCO2 maps with the soil temperature distribution, derived from both direct measurements and airborne infrared images, indicates
the occurrence of extensive condensation of fumarolic steam within the upper part of the Fossa cone, whose total amount is
comparable to the rainfall budget. Part of the condensate which originates from this process contributes to the recharge of
the phreatic aquifer of Porto Plain, modifying the chemical and isotopic composition of the groundwater.
Received: 1 September 1995 / Accepted: 8 January 1996 相似文献
39.
针对监控视频动态目标的空间定位问题,本文在考虑相机畸变的前提下,对监控相机、目标像素坐标和地理场景之间的映射关系进行了研究,提出了基于数字表面模型(DSM)和基于平面约束的目标定位算法。首先,完成相机的标定,确定相机的成像模型;然后,提取畸变校正后的目标像素坐标,并通过目标定位算法计算目标的三维地理坐标;最后,进行了定位精度评定,并分析了两种定位算法的应用特点。本文的定位算法将以像素坐标定位的目标数据解析为以三维坐标定位的空间地理信息,为多摄像头的目标跟踪提供了统一的地理参考框架。 相似文献
40.
Nelson Turgo 《Singapore journal of tropical geography》2013,34(3):373-389
Home‐based neighbourhood stores (locally known in the Philippines as sari‐sari stores) are a ubiquitous feature of most Philippine communities. They are small to medium‐size trade stores not unlike convenience stores in the West where people buy goods in small quantities. In the Philippines, these stores play a vital role in providing everyday economic sustenance to low‐income communities. But more than an economic hub, sari‐sari stores also function as a social hub that connects people and acts as eyes and ears of the community through the people who make use of their services. In a sense, sari‐sari stores are the community's ‘myopticon’ where people's day‐to‐day dealings with everyone in the community and its environs are reported and discursively brought under the gaze of the ‘entire community’. Being myopticon as opposed to Foucault's panopticon, surveillance in sari‐sari stores is partial, non‐hierarchicalized and could be resisted by people in the community. Nonetheless, regardless of the ‘myoptic’ features of sari‐sari stores, their presence in the community ‘interpellates’ everyone's daily existence and instantiates a discursive space from which a structure of informal social control is enacted among community members. Sari‐sari stores then are an important reminder of how our built environment is also about contestation and negotiation of everyday life as we make use of space and as the architectonics of space both constrain and empower our manoeuvring in places. 相似文献