OLE技术在地下水资源数据库图形管理系统中的应用     

于海英  郭东欣  曹剑锋 《吉林大学学报(地球科学版)》1999,29(2):157-159

在阐述对象的链接与嵌入（ＯｂｊｅｃｔＬｉｎｋｉｎｇａｎｄＥｍｅｄｄｉｎｇ,ＯＬＥ）技术的基础上,着重介绍ＯＬＥ技术在地下水资源数据库管理系统中的应用。为地下水资源数据管理的科学化、自动化提供了一个新的思路。  相似文献   

GIS系统集成的理论与实践   总被引：61，自引：0，他引：61  

张犁 《地理学报》1996,51(4):306-314

本文探讨了ＧＩＳ系统集成的若干理论问题，集成系统的体系结构及系统集成的方法与步骤，并结合作者在“八五”攻关课题“洪水灾害遥感监测与评估技术研究”以及“重大自然灾害遥感监测评估集成系统研究”中的实践，介绍了集成的内容和若干工程性提出了运用对象连接与嵌入技术实现模型与ＧＩＳ动态集成的方法。  相似文献   

Geospatial Agents, Agents Everywhere . . .   总被引：1，自引：0，他引：1  

Raja Sengupta  Renée Sieber 《Transactions in GIS》2007,11(4):483-506

The use of the related terms “agent‐based”, “multi‐agent”, “software agent” and “intelligent agent” have witnessed significant growth in the Geographic Information Science (GIScience) literature in the past decade. These terms usually refer to both artificial life agents that simulate human and animal behavior and software agents that support human‐computer interactions. In this article we first comprehensively review both types of agents. Then we argue that both these categories of agents borrow from Artificial Intelligence (AI) research, requiring them to share the characteristics of and be similar to AI agents. We also argue that geospatial agents form a distinct category of AI agents because they are explicit about geography and geographic data models. Our overall goal is to first capture the diversity of, and then define and categorize GIScience agent research into geospatial agents, thereby capturing the diversity of agent‐oriented architectures and applications that have been developed in the recent past to present a holistic review of geospatial agents.  相似文献   

    

Yu Xing  Dai Jin  Jiang Weimei  Fan Peng 《大气科学进展》2000,17(4):617-635

It is essential to learn the temporal and spatial concentration distributions and variations of seeding agents in cloud seeding of precipitation enhancement. A three–dimensional puff trajectory model incorporating a mesoscale nonhydrostatic model has been formulated, and is applied to simulating the transporting and diffusive characteristics of multiple line sources of seeding agents within super–cooled stratus. Several important factors are taken into consideration that affect the diffusion of seeding materials such as effects of topography and vertical wind shear, temporal and spatial variation of seeding parameters and wet deposition. The particles of seeding agents are assumed to be almost inert, they have no interaction with the particles of the cloud or precipitation except that they are washed out by precipitation. The model validity is demonstrated by the analyses and comparisons of model results, and checked by the sensitivity experiments of diffusive coefficients and atmospheric stratification. The advantage of this model includes not only its exact reflection of heterogeneity and unsteadiness of background fields, but also its good simulation of transport and diffusion of multiple line sources. The horizontal diffusion rate and the horizontal transport distance have been proposed that they usually were difficult to obtain in other models. In this simulation the horizontal diffusion rate is 0.82 m s⁻¹ for average of one hour, and the horizontal average transport distance reaches 65 km after 1 h, which are closely related to the background fields.  相似文献   

The second law of geography for a spatially enabled economy     

《International Journal of Digital Earth》2013,6(10):979-995

ABSTRACT

Location has proven axiomatic as an economic variable throughout human history. Tobler’s first law of geography introduced the importance of location; in that, near things are more related than far things. In an age of digital economies, a new research frontier exists where everything is more related to everything else and has an increased economic value from spatially enabled technology. The accessibility of digital-spatial information has brought economic geographers to a new understanding of markets within a Digital Earth framework. The importance of location to economic value can be expected to grow as the Internet of Things develops in sophistication. New business models enter and disrupt established markets with innovative spatially enabled approaches. A successful penetration of established markets suggests a new business model for financial and functional utility by engaging spatially enabled assets. The second law of geography is introduced as a conceptual framework to comprehend the economic potential of spatially enabled information. A comparative analysis of non-spatial versus spatial web agents provides a quantitative framework to demonstrate the benefits of the Digital Earth economy.  相似文献   

节点采集技术在复杂水域地震资料采集中的应用     

何进勇 《物探与化探》2014,(1):87-89

在海上地震勘探数据采集中,会遇到复杂的过渡带水域,其水深变化剧烈,既有水深达二三百米的深水区,也有极浅的、密布的暗礁、小岛和浅滩等浅水区和陆地区。在浅水区,无法采用拖缆船采集施工,在深水区海底电缆又无法达到如此作业深度。在这样的区域内,常规的海上地震数据采集将会出现地震资料缺失带。节点采集技术的作业范围从浅水到700 m水深,能够弥补深水拖缆和海底电缆两种采集方式的短板,可适应于复杂过渡带水域的地震采集,避免地震资料空白区,有利于区域整体勘探、开发。  相似文献   

Exploring Obstacles toEducational Reform: Observations from Finding a Way     

《The Professional geographer》2013,65(4):578-585

This paper examines teachers' expressions of concerns and resistance to the idea of making their classrooms gender equitable. The observations made here arose in the context of the National Science Foundation-funded National Council for Geographic Education Finding A Way project. During Finding A Way summer institutes, teachers were asked to look critically at themselves and reflect on their classroom practices. From their journal entries and personal narratives, it was found that teachers frequently experience powerful emotional responses and cognitive dissonance when asked to address issues of equity in their classrooms. Dissonance, ambivalence, and resistance surfaced most often over the “request” that they become proactive. We found that Finding A Way was most successful with those teachers who were willing to assume the role of “change agents” and who were personally invested in the outcome. Heretofore, professional development research in geography has been remarkably silent on the issue of teacher resistance to educational reform initiatives.  相似文献   

基于MapGIS的图切地质剖面系统面向对象设计与实现          下载免费PDF全文

陈志军  陈建国 《江苏地质》2012,36(3):256-264

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   

Development and testing of a new protocol for evaluating the effectiveness of oil spill surface washing agents   总被引：1，自引：0，他引：1  

Karen Miller Koran  Albert D. Venosa  Christopher C. Luedeker  Keith Dunnigan  George A. Sorial 《Marine pollution bulletin》2009,58(12):1903-1908

As defined by the National Oil and Hazardous Substances Pollution Contingency Plan (NCP), a surface washing agent (SWA) is a product that removes oil from solid surfaces, such as beaches, rocks, and concrete, through a detergency mechanism and that does not involve dispersing or solubilizing the oil into the water column. Commercial products require testing to qualify for listing on the NCP Product Schedule. Such testing is conducted both for toxicity and effectiveness. Protocols currently exist for bioremediation agents and dispersants, but not SWAs. The US Environmental Protection Agency (EPA) is developing a laboratory testing protocol to evaluate the effectiveness of SWAs in removing crude oil from a solid substrate. This paper summarizes some of the defining research supporting this new protocol. Multiple variables were tested to determine their effect on SWA performance. The protocol was most sensitive to SWA-to-oil ratio and rotational speed of mixing. Less sensitive variables were contact time, mixing time, and SWA concentration when total applied mass of active product was constant. EPA recommendations for the testing protocol will be made following round robin testing.  相似文献   

Enhanced bioremediation of crude oil utilizing lipophilic fertilizers combined with biosurfactants and molasses     

Nikolopoulou M  Kalogerakis N 《Marine pollution bulletin》2008,56(11):1855-1861

Many research studies have demonstrated the feasibility and efficacy of fertilization with nitrogen and phosphorus to combat oil spills in marine environments. Rapid dilution of water-soluble nutrients can be overcome by oleophilic formulations that retain optimal nutrient concentrations at the oil-water interface where biodegradation occurs. Previous work has demonstrated that biodegradation processes are enhanced by the addition of lipophilic fertilizers of natural origin (uric acid and lecithin). In this work, we examined the effectiveness of these nutrients in combination with biosurfactants (rhamnolipids) and molasses (source of C and vitamins) to enhance the biodegradation by naturally occurring microorganisms. It was found that the use of biosurfactants resulted in an increased removal of petroleum hydrocarbons (96% removal of C19-C34 n-alkanes within a period of 18 days) as well as in a reduction of the lag phase (almost 80% removal was achieved within the first week of biosurfactant application).  相似文献