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2013 Fourth International Conference on Computing for Geospatial Research and Application最新文献

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Security Considerations on Processing of Geospatial Information in the Cloud 云环境下地理空间信息处理的安全考虑
A. Matheus
The strength of cloud computing is that it dramatically reduces the investment costs for users, required for processing high-volume geospatial data. But in order to have confidential or even classified geospatial data processed in the cloud, service level agreements must ensure the seamless protection of the data. This paper introduces standards for the implementation of security requirements applicable to cloud computing and discusses the concerns towards secure processing of information in the cloud.
云计算的优势在于它极大地降低了用户处理大容量地理空间数据所需的投资成本。但是,为了在云中处理机密甚至分类的地理空间数据,服务级别协议必须确保数据的无缝保护。本文介绍了适用于云计算的安全要求的实现标准,并讨论了对云计算中信息安全处理的关注。
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引用次数: 4
Geospatial Management and Utilization of Large-Scale Urban Visual Reconstructions 大型城市视觉重构的地理空间管理与利用
Clemens Arth, Jonathan Ventura, D. Schmalstieg
In this work we describe our approach to efficiently create, handle and organize large-scale Structure-from-Motion reconstructions of urban environments. For acquiring vast amounts of data, we use a Point Grey Ladybug 3 omni directional camera and a custom backpack system with a differential GPS sensor. Sparse point cloud reconstructions are generated and aligned with respect to the world in an offline process. Finally, all the data is stored in a geospatial database. We incorporate additional data from multiple crowd-sourced databases, such as maps from OpenStreetMap or images from Flickr or Instagram. We discuss how our system could be used in potential application scenarios from the area of Augmented Reality.
在这项工作中,我们描述了我们的方法来有效地创建,处理和组织大规模的城市环境的运动结构重建。为了获取大量数据,我们使用了一个Point Grey Ladybug 3全方位相机和一个带有差分GPS传感器的定制背包系统。稀疏点云重建是在离线过程中生成并与世界对齐的。最后,所有数据都存储在地理空间数据库中。我们整合了来自多个众包数据库的额外数据,例如OpenStreetMap的地图或Flickr或Instagram的图像。我们讨论了我们的系统如何在增强现实领域的潜在应用场景中使用。
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引用次数: 1
Coupling Simulations of Human Driven Land Use Change with Natural Vegetation Dynamics 人类驱动的土地利用变化与自然植被动态的耦合模拟
Aashis Lamsal, Zhihua Liu, M. Wimberly
Summary form only given: Land cover change is the result of interactions and feedbacks between processes operating at different spatial and temporal scales. As human impact on the environment becomes more pronounced, there is growing interest in understanding the effects of environmental and scocio-economic changes on landscape dynamics. Computer simulation models provide a tool for studying the causes and consequences of landscape dynamics and projecting short- and long-term landscape changes. Currently, there is a need for a model that can simulate multiple drivers of land cover change, including natural disturbances vegetation succession along with anthropogenic effects such land use transitions and land management practices. The available land cover change models typically simulate only a subset of these disturbances, which is not sufficient for realistically simulating land cover change over large heterogeneous areas. To addressing this need, we developed a novel simulator that combines two existing modeling frameworks: human-driven land use change (derived from the FORE-SCE model) with natural disturbances and vegetation dynamics (derived from the LADS model) and will incorporate novel feedbacks between human land use and natural disturbance regimes. The simulator is a raster-based, spatially explicit, stochastic computer model that combines a demand-allocation land use change model, a state-and transition for natural vegetation dynamics, and spatially explicit fire initiation and spread. The simulator is being designed to incorporate the effects of climate change, land management, and human demand on resource on land use over and natural vegetation dynamics to provide realistic, high resolution, and scenario-based land cover products. The simulator is a stand-alone program written in Visual C++ environment for use in Microsoft Windows Operating System environment, and in continuous development. This poster highlights the conceptual and technical design of the model integration.
摘要:土地覆盖变化是在不同时空尺度上运行的过程之间相互作用和反馈的结果。随着人类对环境的影响越来越明显,人们对了解环境和社会经济变化对景观动态的影响越来越感兴趣。计算机模拟模型为研究景观动态的原因和后果以及预测短期和长期景观变化提供了工具。目前,需要一种能够模拟土地覆盖变化多种驱动因素的模型,包括自然干扰、植被演替以及土地利用转变和土地管理实践等人为影响。现有的土地覆盖变化模型通常只模拟这些干扰的一个子集,这不足以真实地模拟大型异质区域的土地覆盖变化。为了满足这一需求,我们开发了一种新的模拟器,它结合了两种现有的建模框架:人类驱动的土地利用变化(源自FORE-SCE模型)与自然干扰和植被动态(源自LADS模型),并将人类土地利用和自然干扰制度之间的新反馈纳入其中。该模拟器是一个基于栅格的、空间明确的随机计算机模型,它结合了需求分配土地利用变化模型、自然植被动态的状态和过渡,以及空间明确的火灾发生和蔓延。该模拟器的设计目的是将气候变化、土地管理和人类对资源的需求对土地利用和自然植被动态的影响结合起来,以提供真实的、高分辨率的、基于场景的土地覆盖产品。该模拟器是在Microsoft Windows操作系统环境下用Visual c++编写的独立程序,并在不断开发中。这张海报强调了模型集成的概念和技术设计。
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引用次数: 1
Geostatistical Approach for Computing Absolute Vertical Accuracy of Digital Terrain Models 计算数字地形模型绝对垂直精度的地统计学方法
G. Ben-Haim, S. Dalyot, Y. Doytsher
Digital Terrain Models (DTMs) are widely and intensively used as a computerized mapping and modeling infrastructure representing our environment. There exist many different types of wide-coverage DTMs generated by various acquisition and production techniques, which differ significantly in terms of geometric attributes and accuracy. In aspects of quality and accuracy most studies investigate relative accuracy relying solely on coordinate-based comparison approaches that ignore the local spatial discrepancies exist in the data. Our long-term goal aims at analyzing the absolute accuracy of such models based on hierarchical feature-based spatial registration, which relies on the represented topography and morphology, taking into account local spatial discrepancies exist. This registration is the preliminary stage of the quality analysis, where a relative DTM comparison is performed to determine the accuracy of the two models. This paper focuses on the second stage of the analysis applying the same mechanism on multiple DTMs to compute the absolute accuracy based on the fact that this solution system has a high level of redundancy. The suggested approach not only qualitatively computes posteriori absolute accuracies of DTMs, usually unknown, but also thoroughly analyzes the absolute accuracies of existing local trends. The methodology is carried out by developing an accuracy computation analysis using simultaneously multiple different independent wide-coverage DTMs that describe the same relief. A comparison mechanism is employed on DTM pairs using Least Squares Adjustment (LSA) process, in which absolute accuracies are computed based on theory of errors concepts. A simulation of four synthetic DTMs is presented and analyzed to validate the feasibility of the proposed approach.
数字地形模型(dtm)作为一种代表我们环境的计算机制图和建模基础设施被广泛而深入地使用。通过不同的采集和生产技术,产生了许多不同类型的大覆盖dtm,这些dtm在几何属性和精度方面差异很大。在质量和精度方面,大多数研究仅仅依靠基于坐标的比较方法来研究相对精度,而忽略了数据中存在的局部空间差异。我们的长期目标是分析基于分层特征的空间配准模型的绝对精度,该模型依赖于所表示的地形和形态,同时考虑到局部空间差异的存在。这种配准是质量分析的初步阶段,其中执行相对DTM比较以确定两个模型的准确性。本文重点介绍了分析的第二阶段,基于该解决方案系统具有高冗余度的事实,在多个dtm上应用相同的机制来计算绝对精度。该方法不仅定性地计算了通常未知的dtm的后验绝对精度,而且对现有局部趋势的绝对精度进行了深入的分析。该方法是通过同时使用描述同一地形的多个不同独立的大覆盖dtm进行精度计算分析来实现的。采用最小二乘平差(LSA)方法对DTM对进行比较,根据误差概念计算绝对精度。通过对四种合成dtm的仿真分析,验证了该方法的可行性。
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引用次数: 1
Balanced Block Design Architecture for Parallel Computing in Mobile CPUs/GPUs 移动cpu / gpu并行计算的平衡块设计体系结构
G. Mani, S. Berkovich, Duoduo Liao
To increase performance, processor manufacturers extract parallelism through shrinking transistors and adding more of them to single-core chips and create multi-core systems. Although microprocessors performance continues to grow at an exponential rate, this approach generates too much heat and consumes too much power. These architectures not only introduce several complications but require tremendous efforts for organization of special software for parallel processing. In many cases, these difficulties are insurmountable. The programmers have to write complex code to prioritize the tasks or perform the task in parallel like extracting parallelism through threads in GPUs. One of the key issues for the programmers is how to divide the tasks in to sub-tasks. A faulty calculation may lead to increased data dependency which will slow the processor. Processor that performs more parallel operations can simultaneously increase the queuing delays. In both of the scenarios mentioned above, the relative cost of communication (also known as data transportation energy) between processing elements in microprocessor (or objects in parallel programming) is increasing relative to that of computation. This trend is resulting in larger caches for every new processor generation and more complex and costly latency tolerant mechanisms. Here we introduce a combinatorial architecture that has a unique property-multi-core running on a sequential code. This architecture can be used for both CPUs and GPUs. Some minor adjustments to a regular compiler are needed for loading. Especially, current mobile GPUs technologies are still relatively immature and require substantial improvements to enable wireless devices to perform the complex graphics-related functions. Our new architecture is more suitable for mobile GPUs/CPUs, i.e., mobile heterogeneous computing, with limited resources and relative greater performance.
为了提高性能,处理器制造商通过缩小晶体管并在单核芯片中添加更多晶体管来提取并行性,并创建多核系统。虽然微处理器的性能继续以指数速度增长,但这种方法产生太多的热量,消耗太多的功率。这些体系结构不仅带来了一些复杂性,而且需要大量的工作来组织用于并行处理的专用软件。在许多情况下,这些困难是无法克服的。程序员必须编写复杂的代码来确定任务的优先级,或者并行执行任务,比如通过gpu中的线程提取并行性。对于程序员来说,关键问题之一是如何将任务划分为子任务。错误的计算可能导致增加的数据依赖性,这将减慢处理器的速度。执行更多并行操作的处理器会同时增加排队延迟。在上面提到的两种情况下,微处理器(或并行编程中的对象)中处理元素之间的通信(也称为数据传输能量)的相对成本相对于计算的相对成本正在增加。这种趋势导致每一代新处理器都需要更大的缓存,以及更复杂、更昂贵的延迟容忍机制。这里我们介绍一种组合体系结构,它具有独特的特性——在顺序代码上运行多核。这种架构既可以用于cpu,也可以用于gpu。加载需要对常规编译器进行一些小的调整。特别是,目前的移动gpu技术还相对不成熟,需要大量的改进才能使无线设备执行复杂的图形相关功能。我们的新架构更适合移动gpu / cpu,即移动异构计算,资源有限,性能相对更高。
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引用次数: 4
Application of Statistical Methods in City Economic and Living Standard Study: A Case of China (2003 -- 2008) 统计方法在城市经济与生活水平研究中的应用——以中国2003—2008年为例
Wenjing Cao
In recent years, statistical methods are used more and more in the field of economic and living standard, which is a very important indicator reflecting the degree of society development and peoples' living quality. This paper uses 14 economic and living indexes to analyze and evaluate economic and living standard of China from year 2003 and 2008. The results show that three components can be extracted as 'income and expense capability', 'asset investment situation' and 'whole economical strength (poor or rich)' from these 14 indexes. Besides, all study areas in this study can be divided into three groups according to their living standard, which is related with development degree and geographical location.
经济和生活水平是反映社会发展程度和人民生活质量的一个非常重要的指标,近年来,统计方法越来越多地应用于经济和生活水平领域。本文采用14项经济和生活指标对2003年和2008年中国的经济和生活水平进行了分析和评价。结果表明,从这14项指标中可以提取出“收入和支出能力”、“资产投资状况”和“整体经济实力(贫穷或富裕)”三个成分。此外,本研究的所有研究区域都可以根据其生活水平分为三组,这与发展程度和地理位置有关。
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引用次数: 0
Characterization of Moving Point Objects in Geospatial Data 地理空间数据中移动点对象的表征
S. Bhattacharya, B. Czejdo, R. Malhotra, Nicolas Perez, R. Agrawal
Summary form only given. Geospatial data that exhibit time varying patterns are being captured faster than we are able to process them. We thus need machines to assist us in these tasks. One such problem is the automatic understanding of the behavior of moving objects for finding higher level information such as goals, intention etc. We propose a system that can solve one part of this complex task: automatic classification of movement patterns made by objects. In addition our system makes some simplifying assumptions: a) the object can be approximated as a moving point object (MPO) b) we consider interaction of a single MPO such as a car or mobile human, with static elements such as road networks and buildings e.g. airports, bus stops etc. on a terrain c) interactions between multiple MPOs are not considered. We use supervised machine learning algorithms to train the proposed system in classifying various patterns of spatiotemporal data. Algorithms such as Support Vector Machines and Decision Tree learning are trained with human labeled feature vectors that mathematically summarize how an MPO interacts with a landmark over time. Our feature vector incorporates a variety of geometric and temporal measurements such as the variable distances of the MPO to different points on the landmark, rate of change with time of variables such as distances and angles that are formed by the MPO with respect to the landmark. Simulated data created through graphical user interaction and agent-based modeling techniques are used to simulate MPO patterns over a representation of a real-world road network. The open source agent-based modeling tool Net Logo along with its GIS extension, and also the Agent Analyst module of ArcGIS are used to simulate large data sets. As future extensions, we are working on classification and prediction problems that involve multiple MPOs and landmarks.
只提供摘要形式。呈现时变模式的地理空间数据被捕获的速度比我们处理它们的速度要快。因此,我们需要机器来协助我们完成这些任务。其中一个问题是自动理解移动物体的行为,以寻找更高层次的信息,如目标、意图等。我们提出了一个系统,可以解决这个复杂任务的一部分:自动分类的运动模式的对象。此外,我们的系统还做了一些简化的假设:a)对象可以近似为一个移动点对象(MPO); b)我们考虑单个MPO(如汽车或移动的人)与地形上的静态元素(如道路网络和建筑物,如机场、公交车站等)的交互;c)不考虑多个MPO之间的交互。我们使用监督机器学习算法来训练所提出的系统对各种时空数据模式进行分类。支持向量机和决策树学习等算法是用人类标记的特征向量来训练的,这些特征向量在数学上总结了MPO如何随着时间的推移与地标相互作用。我们的特征向量包含了各种几何和时间测量,例如MPO到地标上不同点的可变距离,MPO相对于地标形成的距离和角度等变量随时间的变化率。通过图形用户交互和基于代理的建模技术创建的模拟数据用于模拟现实世界道路网络表示上的MPO模式。利用开源的基于Agent的建模工具Net Logo及其GIS扩展,以及ArcGIS中的Agent Analyst模块对大型数据集进行仿真。作为未来的扩展,我们正在研究涉及多个mpo和地标的分类和预测问题。
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引用次数: 1
Mapping the Internet: Geolocating Routers by Using Machine Learning 映射互联网:使用机器学习定位路由器
A. Prieditis, Gang Chen
Knowing the geolocation of a router can help to predict the geolocation of an Internet user, which is important for local advertising, fraud detection, and geo-fencing applications. For example, the geolocation of the last router on the path to a user is a reasonable guess for the user's geolocation. Current methods for geolocating a router are based on parsing a router's name to find geographic hints. Unfortunately, these methods are noisy and often provide no hints. This paper presents results on using machine learning methods to "sharpen" a router's noisy location based on the time delay between one or more routers and a target router or end user IP address. The novelty of this approach is that geolocation of the one or more routers is not required to be known.
了解路由器的地理位置可以帮助预测Internet用户的地理位置,这对于本地广告、欺诈检测和地理围栏应用程序非常重要。例如,用户路径上的最后一个路由器的地理位置是对用户地理位置的合理猜测。当前对路由器进行地理定位的方法是基于解析路由器的名称来查找地理提示。不幸的是,这些方法是嘈杂的,通常不提供提示。本文展示了使用机器学习方法基于一个或多个路由器与目标路由器或最终用户IP地址之间的时间延迟来“锐化”路由器的噪声位置的结果。这种方法的新颖之处在于不需要知道一个或多个路由器的地理位置。
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引用次数: 6
You Can Go Your Own Way...But You Won't: Exploring Road Utilization in the Bay Area 你可以走自己的路……但你不会:探索海湾地区的道路利用
Robert A. Semmens
Many psychological studies have provided valuable insight to how we navigate space. However, a common criticism of this research is that the experimental environment or the tasks performed may appear to overstate the importance of small behavioral differences. This paper operationalizes two route selection heuristics and examines highway utilization data that should correlate with these lab findings.
许多心理学研究为我们如何在空间中导航提供了有价值的见解。然而,对这项研究的一个普遍批评是,实验环境或执行的任务似乎夸大了微小行为差异的重要性。本文运用了两种路线选择启发式方法,并检查了与这些实验室发现相关的公路利用数据。
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引用次数: 0
CARL: Crash Attribute and Reference Locator 崩溃属性和引用定位器
Kyle Schutt, Joseph Newman, K. Hancock, P. Sforza
Customizable tools that extend the functionality and enhance existing features within a software system are the keys to continued innovation. Depending on complexity, current and proposed projects tend to push the limits of existing functionality and require new tools to perform unique processes. Fortunately, software engineers and designers have taken this paradigm to heart and have created software systems with extensible architectures and frameworks. This paper presents one such customization for Esri ArcGIS that addresses the unique concerns and requirements of an ongoing project at the Center for Geospatial Information Technology involved with geo locating police reported vehicle crashes in the Commonwealth of Virginia. The tool takes advantage of theories and concepts from both computer science and geographic information systems to assist geocoders with evaluating, locating, and attributing crash data. Additionally, the tool provides a centralized web-based administrative portal for project managers.
在软件系统中扩展功能和增强现有特性的可定制工具是持续创新的关键。根据复杂性,当前和拟议的项目往往会突破现有功能的极限,并需要新的工具来执行独特的过程。幸运的是,软件工程师和设计师已经将这个范例牢记在心,并创建了具有可扩展架构和框架的软件系统。本文介绍了Esri ArcGIS的一个这样的定制,它解决了地理空间信息技术中心正在进行的一个项目的独特问题和需求,该项目涉及弗吉尼亚联邦警察报告的车辆碰撞的地理定位。该工具利用了计算机科学和地理信息系统的理论和概念,帮助地理编码器评估、定位和归因事故数据。此外,该工具还为项目经理提供了一个集中的基于web的管理门户。
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引用次数: 4
期刊
2013 Fourth International Conference on Computing for Geospatial Research and Application
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