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Mapping uncertain spatial object extents from point samples using fuzzy alpha-shapes 使用模糊alpha形状从点样本映射不确定的空间对象范围
IF 1.4 Q2 Social Sciences Pub Date : 2023-05-17 DOI: 10.5311/josis.2023.26.254
T. Etherington
Mapping the extent of spatial objects from point samples is a fundamental process in geographical analysis. Computational geometry methods are commonly used, and one method that has been proposed is the alpha-shape as it is insensitive to both bias and errors that are common in crowdsourced geographic data and big geographic data more generally. However, many spatial objects are uncertain in nature, with vague boundaries that are not well represented by the current use of discrete alpha-shapes. Fuzzy alpha-shapes are presented as a highly generic and adaptable methodology that can produce maps of spatial objects that recognise the vague and uncertain nature of many geographies. A series of virtual geography experiments demonstrate that fuzzy alpha-shapes avoid the need for binary thresholds, create a model that better represents the uncertain boundaries of some spatial objects, while also retaining the robustness to errors and bias that motivated the original use of alpha-shapes for mapping spatial objects.
从点样中绘制空间目标的范围是地理分析的一个基本过程。计算几何方法是常用的,其中一种已被提出的方法是alpha-shape,因为它对众包地理数据和更普遍的大地理数据中常见的偏差和错误不敏感。然而,许多空间对象在本质上是不确定的,其模糊的边界不能很好地由当前使用的离散alpha形状表示。模糊alpha形状是一种高度通用和适应性强的方法,可以生成识别许多地理位置模糊和不确定性质的空间物体地图。一系列虚拟地理实验表明,模糊alpha-形状避免了对二值阈值的需要,创建了一个更好地代表某些空间对象的不确定边界的模型,同时还保留了对误差和偏差的鲁棒性,这促使最初使用alpha-形状来映射空间对象。
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引用次数: 1
Representative dissimilar path queries: accommodating human movement dynamics in road networks 代表性的不同路径查询:在道路网络中适应人类运动动态
IF 1.4 Q2 Social Sciences Pub Date : 2023-05-17 DOI: 10.5311/josis.2023.26.221
T. Hashem, M. Duckham, Mahathir Monjur, F. Islam
We introduce a representative dissimilar path (RDP) query, a novel type of path query in road networks. The k representative paths (RPs) between a source and a destination locations have k smallest costs for a feature (e.g., length, number of road intersections, or straightness). Given x features and k, an RDP query returns a set of paths for a source-destination pair such that the path set includes at least one of the k RPs for every feature, and the path set's similarity score is minimized. We formulate a novel measure to quantify the similarity of a set of paths. Considering different road features and incorporating the novel similarity measure in the computation of RDPs allow us to accommodate the human movement dynamics between two locations in an effective way. Finding the RDPs is a computational challenge because an RDP query requires computing the RPs for multiple features and then finding the RDPs from an exponential number of path combinations. We develop an efficient solution to answer RDP queries. The underlying ideas behind the efficiency of our algorithms are the refinement of the search space, finding the RPs for multiple features with a single search, and exploiting both the lower and upper bounds of the path set's similarity score while identifying the RDPs. We show the efficacy of the RDP query and the efficiency of our solution to answer the RDP query in extensive experiments using real datasets.
我们介绍了一种具有代表性的不同路径(RDP)查询,这是道路网络中的一种新型路径查询。源位置和目的地位置之间的k个代表性路径(RP)对于一个特征具有k个最小成本(例如,长度、道路交叉口的数量或直线度)。给定x个特征和k,RDP查询返回源-目的地对的一组路径,使得该路径集包括每个特征的k个RP中的至少一个,并且该路径集的相似性得分被最小化。我们提出了一种新的度量方法来量化一组路径的相似性。考虑不同的道路特征,并在RDP的计算中加入新的相似性度量,使我们能够有效地适应两个位置之间的人类运动动态。查找RDP是一项计算挑战,因为RDP查询需要计算多个功能的RP,然后从指数数量的路径组合中查找RDP。我们开发了一个有效的解决方案来回答RDP查询。我们算法效率背后的基本思想是优化搜索空间,用一次搜索找到多个特征的RP,并在识别RDP时利用路径集相似性得分的下限和上限。在使用真实数据集进行的大量实验中,我们展示了RDP查询的有效性以及我们的解决方案对RDP查询进行回答的效率。
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引用次数: 1
Surface network and drainage network: towards a common data structure 地表网与排水网:走向共同的数据结构
IF 1.4 Q2 Social Sciences Pub Date : 2023-05-17 DOI: 10.5311/josis.2023.26.240
Éric Guilbert, Francis Lessard, N. Perreault, S. Jutras
The surface network is an application of the Morse-Smale complex to digital terrain models connecting ridges and thalwegs of the terrain in a planar, undirected graph. Although it provides a topological structure embedding critical elements of the terrain, its application to morphological analysis and hydrology remains limited mainly because the drainage network is the most relevant structure for analysis and it cannot be derived from the surface network. The drainage network is a directed, hierarchical graph formed by streams. Ridges of the surface network are not equivalent to drainage divides, which are not contained in the drainage network, and there is no direct association between thalwegs and streams. Therefore, this paper proposes to extend the surface network into a new structure that also embeds the drainage network. This is done by (1) revising the definition of ridges so that they include drainage divides and (2) assigning a flow direction to each thalweg, taking into account spurious depressions to avoid flow interruption. We show that this extended surface network can be used to compute the flow accumulation and different hydrographic features such as drainage basins and the Strahler order. The drainage network extracted from the extended surface network is compared to drainage networks computed with the traditional D8 approach in three case studies. Differences remain minor and are mainly due to the elevation inaccuracy in flat or slightly convex areas. Hence, the extended surface network provides a richer data structure allowing the use of a common topological data structure in both terrain analysis and hydrology.
地表网络是莫尔斯-斯莫尔复合体在数字地形模型中的一种应用,它将地形的脊和丘连接在一个平面无向图中。虽然它提供了嵌入地形关键要素的拓扑结构,但其在形态分析和水文学中的应用仍然有限,主要是因为排水网络是最相关的分析结构,不能从地表网络中推导出来。水系网是由水流形成的有向的、分层的图。地面网的山脊不等同于水系分水岭,水系不包含在水系网中,水系与水系之间没有直接联系。因此,本文建议将地表网络扩展为一种新的结构,该结构也嵌入了排水网络。这是通过(1)修改山脊的定义,使它们包括排水分界线和(2)为每个井指定一个流动方向,考虑到虚假的凹陷,以避免流动中断。研究表明,这种扩展的地表网络可以用来计算水流积累和不同的水文特征,如流域和斯特拉勒顺序。在三个案例研究中,将从扩展地表网络中提取的排水网络与传统D8方法计算的排水网络进行了比较。差异仍然很小,主要是由于在平坦或微凸区域的高程不准确。因此,扩展的地表网络提供了更丰富的数据结构,允许在地形分析和水文中使用共同的拓扑数据结构。
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引用次数: 1
Inferring routing preferences from user-generated trajectories using a compression criterion 使用压缩标准从用户生成的轨迹推断路由偏好
IF 1.4 Q2 Social Sciences Pub Date : 2023-05-17 DOI: 10.5311/josis.2023.26.256
Axel Forsch, Johannes Oehrlein, Benjamin Niedermann, J. Haunert
The optimal path between two vertices in a graph depends on the optimization objective, which is often defined as a weighted sum of multiple criteria. When integrating two criteria, their relative importance is expressed with a balance factor α. We present a new approach for inferring α from trajectories. The core of our approach is a compression algorithm that requires a graph G representing a transportation network, two edge costs modeling routing criteria, and a path P in G representing the trajectory. It yields a minimum subsequence S of the sequence of vertices of P and a balance factor α, such that the path P can be fully reconstructed from S, G, its edge costs, and α. By minimizing the size of S over α, we learn the balance factor that corresponds best to the user's routing preferences. In an evaluation with crowd-sourced cycling trajectories, we weigh the usage of official signposted cycle routes against other routes. More than 50% of the trajectories can be segmented into five optimal sub-paths or less. Almost 40% of the trajectories indicate that the cyclist is willing to take a detour of 50% over the geodesic shortest path to use an official cycle path.
图中两个顶点之间的最优路径取决于优化目标,优化目标通常被定义为多个标准的加权和。当整合两个准则时,它们的相对重要性用平衡因子α表示。我们提出了一种从轨迹推断α的新方法。我们方法的核心是一种压缩算法,它需要一个表示运输网络的图G,两个边缘成本建模路由标准,以及G中的路径P表示轨迹。它产生了P的顶点序列的最小子序列S和一个平衡因子α,使得路径P可以由S、G、它的边代价和α完全重构。通过最小化S / α的大小,我们学习最符合用户路由偏好的平衡因子。在对众包自行车轨迹的评估中,我们权衡了官方路标自行车路线与其他路线的使用情况。超过50%的轨迹可以被分割成5个或更少的最优子路径。近40%的轨迹表明,骑车者愿意在测地线最短路径上绕行50%,以使用官方自行车道。
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引用次数: 1
Modeling walkability by remote sensing as latent walking speed extracted from multiple digital trail maps 从多个数字步道地图中提取潜在步行速度的遥感可步行性建模
IF 1.4 Q2 Social Sciences Pub Date : 2022-12-20 DOI: 10.5311/josis.2022.25.204
Ljiljana Šerić, Marina Tavra, I. Racetin, Antonia Ivanda
Coordinating and managing teams searching for missing persons in wilderness areas is challenging. Local terrain characteristics and environmental conditions strongly influence how searchers accomplish their search tasks. When making decisions, searchers consult various maps of the area. In this paper we proposed a methodology for mapping characteristics of the area that influence user behavior when walking the area, and define a walkability model of the terrain. We define walkability as a measure of how fast a person can walk through terrain. The observed walking speed depends on factors such as the fitness and motivation of a person walking through the terrain, as well as on assistive features and the configuration of the terrain. In our method, walkability is predicted only as a feature of terrain configuration. We used singular value decomposition (SVD) to transform datasets to extract latent features of the terrain and users from multiple Global Positioning System (GPS) trails. We define the walkability measure as a latent component of walking speed, which is a function of terrain features. Finally, we use a  polynomial regression algorithm to build a model for predicting terrain walkability based on remote sensing imagery from the Sentinel-2 mission. The application of the proposed model is demonstrated in the Kozjak mountain region in the Republic of Croatia.
协调和管理在荒野地区搜寻失踪人员的小组具有挑战性。当地地形特征和环境条件强烈影响搜索人员完成搜索任务的方式。在做出决定时,搜索人员会查阅该地区的各种地图。在本文中,我们提出了一种绘制影响用户在该区域行走时行为的区域特征的方法,并定义了地形的可行走性模型。我们将可步行性定义为一个人在地形中行走的速度。观察到的步行速度取决于一些因素,如一个人在地形中行走的健康度和动机,以及辅助功能和地形的配置。在我们的方法中,步行能力仅作为地形配置的一个特征进行预测。我们使用奇异值分解(SVD)对数据集进行变换,从多个全球定位系统(GPS)轨迹中提取地形和用户的潜在特征。我们将步行能力测量定义为步行速度的潜在组成部分,步行速度是地形特征的函数。最后,我们使用多项式回归算法,基于哨兵2号任务的遥感图像,建立了一个预测地形可步行性的模型。所提出的模型在克罗地亚共和国的Kozjak山区得到了应用。
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引用次数: 1
A quantitative spatial methodology for delimiting historical centers - an application in Guarda, Portugal 划定历史中心的定量空间方法——在葡萄牙瓜尔达的应用
IF 1.4 Q2 Social Sciences Pub Date : 2022-12-20 DOI: 10.5311/josis.2022.25.164
M. Soares, F. Fonseca, R. Ramos
A historical center can be defined as the oldest part of a city where a significant part of the building stock dates back to the early stages of urban growth. Historical centers often contain special urban fabrics with unique, historic, social and cultural identity. Owing to this, they have been subject to special urban planning interventions in order not only to protect the existing urban fabric and its originality, but also to revert depopulation and built deterioration processes aiming to make these old centers attractive and functional again. However, in the inter-urban domain, there is a deficit of spatial planning research, and the delimitation of historical centers is a topic that has been under explored. This paper describes a morphological approach for delimiting the historical center of Guarda, Portugal. Methodologically, the work uses building stock-age data from eight periods between <1919 to 2011 and is supported by both statistical and spatial analysis. Statistically, the urban evolution of the city was analyzed through threshold values and five novel building indexes. Spatially, the work involved disaggregated GIS analysis to map the evolution of built-up areas and to identify the consolidated urban areas. A sensitivity analysis was also performed to assess the influence of some parameters on the obtained boundary. Results indicated that the historical center of Guarda was consolidated in the 1960s and, since then, has been relatively unchanged. The obtained boundary shows a suitable spatial adjustment considering the consolidated urban area and the official boundary included in the Urban Rehabilitation Area. 
历史中心可以被定义为城市最古老的部分,其中很大一部分建筑存量可以追溯到城市发展的早期阶段。历史中心往往包含具有独特历史、社会和文化特征的特殊城市结构。因此,它们受到了特殊的城市规划干预,不仅是为了保护现有的城市结构及其独创性,也是为了恢复人口减少和建筑退化的过程,目的是使这些旧中心重新具有吸引力和功能。然而,在城际领域,空间规划研究存在不足,历史中心的划界是一个探索不足的话题。本文介绍了一种形态学方法来界定葡萄牙瓜尔达的历史中心。从方法上讲,这项工作使用了1919年至2011年八个时期的建筑存量年龄数据,并得到了统计和空间分析的支持。从统计学上讲,通过阈值和五个新的建筑指标来分析城市的演变。在空间上,这项工作涉及分类的地理信息系统分析,以绘制建成区的演变图,并确定合并的城市区域。还进行了灵敏度分析,以评估一些参数对所获得边界的影响。结果表明,瓜尔达的历史中心在20世纪60年代得到了巩固,此后一直相对不变。所获得的边界显示了一个适当的空间调整,考虑到合并后的城市区域和城市复兴区内的官方边界。
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引用次数: 2
Spatial pattern of environmental perception and place attachment in a diverse socio-economic context: the case of Gauteng province, South Africa 不同社会经济背景下环境感知和地方依恋的空间格局:以南非豪登省为例
IF 1.4 Q2 Social Sciences Pub Date : 2022-12-20 DOI: 10.5311/josis.2022.25.174
S. Dlamini, S. Tesfamichael, G. Weir-Smith, T. Mokhele
There is limited consensus among researchers on whether the spatial distribution of environmental perceptions and place attachment is influenced by socio-economic factors. This study aimed to determine if environmental perceptions and place attachment concepts in our study area (within Gauteng province, South Africa) showed specific spatial patterns. Hot spot, cluster-outlier analysis, and geographically weighted regression (GWR) were used to depict the spatial patterns of environmental perceptions and place attachment. Results showed a pattern where the central, generally affluent wards of the province hold more positive environmental perceptions and place attachment than those in the periphery. This is in line with dependency and other models that associate lower socio-economic status with lower levels of environmental awareness but is incongruent with other findings that have associated lower socio-economic status with pro-environmental behaviour being more prominent. Geographically weighted regression results revealed the combined importance of numbers of people with above-average income, college-level education, age below 50 years, female proportion, formal dwelling residence and African race in explaining the numbers of people with positive views on place attachment and environmental perceptions. Further, the GWR modelling allowed for the spatial dependence of the relationship between place attachment and environmental perceptions on the one hand and socio-economic factors on the other. These results have significant implications for environmental sustainability, planning and policy formulation in the province.
对于环境感知和地点依恋的空间分布是否受到社会经济因素的影响,研究人员的共识有限。本研究旨在确定我们研究区域(南非豪登省)的环境感知和场所依恋概念是否显示出特定的空间模式。热点、聚类异常值分析和地理加权回归(GWR)用于描述环境感知和地点依恋的空间模式。结果显示,与周边地区相比,该省中部、总体富裕的地区对环境的看法和依恋更为积极。这与依赖性和其他模型一致,这些模型将较低的社会经济地位与较低的环境意识水平联系起来,但与其他研究结果不一致,这些研究结果将较低社会经济地位和更突出的环保行为联系起来。地理加权回归结果显示,收入高于平均水平、大学学历、50岁以下年龄、女性比例、正式居住地和非洲种族的人数在解释对地方依恋和环境感知持积极看法的人数方面具有综合重要性。此外,GWR模型一方面考虑了地方依恋和环境感知之间的关系与另一方面考虑到社会经济因素之间的空间依赖性。这些结果对该省的环境可持续性、规划和政策制定具有重要意义。
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引用次数: 2
Bayesian location estimation of mobile devices using a signal strength model 使用信号强度模型的移动设备的贝叶斯位置估计
IF 1.4 Q2 Social Sciences Pub Date : 2022-12-20 DOI: 10.5311/josis.2022.25.166
M. Tennekes, Y. Gootzen
Mobile network operator (MNO) data are a rich data source for various topics in official statistics, such as present population, mobility, migration, and tourism. Estimating the geographic location of mobile devices is an essential step for statistical inference. Most studies use Voronoi tessellation for this, which is based on the assumption that mobile devices are always connected to the nearest radio cell. We propose an alternative location estimation method following a Bayesian approach and using a physical model for the received signal strength. Our Bayesian framework allows for different modules of prior knowledge about where devices are expected to be, and different modules for the likelihood of connection given a geographic location. We discuss and compare the use of several prior modules, including one that is based on land use. For the likelihood module we propose a signal strength model using radio cell properties such as antenna height, propagation direction, and power. Using Bayes' rule, we derive a posterior probability distribution that is an estimate of the geographic location, which can be used for further statistical inference. We describe the method and provide illustrations of a fictional example that resembles a real-world situation. The method has been implemented in the R packages mobloc and mobvis, which are briefly described.
移动网络运营商(MNO)数据是官方统计中各种主题的丰富数据源,如现有人口、流动性、迁移和旅游。估计移动设备的地理位置是统计推断的重要步骤。大多数研究使用Voronoi镶嵌法,这是基于移动设备总是连接到最近的无线基站的假设。我们提出了一种替代的位置估计方法,该方法遵循贝叶斯方法并使用接收信号强度的物理模型。我们的贝叶斯框架允许不同的先验知识模块来预测设备的位置,以及不同的模块来预测给定地理位置的连接可能性。我们讨论和比较了几个先前模块的使用,包括一个基于土地使用的模块。对于似然模组,我们提出一个讯号强度模型,使用无线电单元的特性,例如天线高度、传播方向和功率。利用贝叶斯规则,我们得到了一个后验概率分布,它是对地理位置的估计,可以用于进一步的统计推断。我们描述了该方法,并提供了一个类似于现实世界情况的虚构示例的插图。该方法已在R软件包mobloc和mobvis中实现,并对其进行了简要描述。
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引用次数: 2
Temporally relevant parallel top-k spatial keyword search 时间相关的并行top-k空间关键字搜索
IF 1.4 Q2 Social Sciences Pub Date : 2022-06-20 DOI: 10.5311/josis.2022.24.199
S. Ray, B. Nickerson
New spatio-textual indexing methods are needed to support efficient search and update of the massive amounts of spatially referenced text being generated. Location based services using geo-tagged documents provide valuable ranked recommendations about nearby restaurants, services, sales, emergency events, and visitor attractions. Consequently, top-k spatial keyword search queries (TkSKQ) have received a lot of attention from the research community. Several spatio-textual indexes have been proposed to efficiently support TkSKQ. Some of these indexes support updates based on live document streams, but the ranking schemes employed by them do not simultaneously incorporate temporal relevance, textual similarity and spatial proximity. Moreover, existing approaches have limited or no capability to exploit parallelism with document ingestion and query execution. We present a parallel spatio-textual index, Pastri, to address the aforementioned issues. Pastri can be updated incrementally over real-time spatio-textual document streams. To support temporally relevant ranking of continuously generated document streams, we propose a dynamic ranking scheme. Our approach retrieves the top-k documents that are most temporally relevant at the time of a query execution. We implemented Pastri and we integrate it within a system with a persistent document store and several thread pools to exploit parallelism at various levels. Experimental evaluation involving real-world datasets and synthetic datasets (that we created) demonstrates that our system is able to sustain high document update throughput. Furthermore, Pastri's TkSKQ search performance is one to two orders of magnitude faster than other spatio-textual indexes.
需要新的空间文本索引方法来支持对生成的大量空间引用文本的高效搜索和更新。使用地理标记文档的基于位置的服务提供有关附近餐馆、服务、销售、紧急事件和旅游景点的有价值的排名推荐。因此,top-k空间关键字搜索查询(TkSKQ)受到了研究界的广泛关注。为了有效地支持TkSKQ,提出了几种空间文本索引。其中一些索引支持基于实时文档流的更新,但是它们采用的排序方案没有同时考虑时间相关性、文本相似性和空间接近性。此外,现有的方法在利用文档摄取和查询执行的并行性方面能力有限,甚至没有。我们提出了一个平行的空间-文本索引,Pastri,以解决上述问题。Pastri可以在实时空间文本文档流上增量更新。为了支持对连续生成的文档流进行时间相关排序,我们提出了一种动态排序方案。我们的方法检索在查询执行时最具临时相关性的前k个文档。我们实现了Pastri,并将其集成到一个具有持久文档存储和几个线程池的系统中,以利用不同级别的并行性。涉及真实世界数据集和合成数据集(我们创建的)的实验评估表明,我们的系统能够维持高文档更新吞吐量。此外,Pastri的TkSKQ搜索性能比其他空间文本索引快一到两个数量级。
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引用次数: 1
Linguistic expression of place appreciation in English and Welsh 英语和威尔士语中地方欣赏的语言表达
IF 1.4 Q2 Social Sciences Pub Date : 2022-06-20 DOI: 10.5311/josis.2022.24.209
T. Tenbrink, A. Williams
Despite the prominence of 'place' notions in human geography and beyond, the language of place is surprisingly poorly understood. Platial research addresses human relations to places beyond the purely (geometric and cognitive) spatial aspects, whose linguistic features are well researched. This paper offers an in-depth case study of platial discourse in English and Welsh, contributing to a better understanding of how people use language to describe their attachment to a place. We asked 72 people to describe three local areas in North Wales in terms of what makes each one special and distinctive, along with further questions. We explore the responses in terms of a range of qualitative linguistic features indicating aspects such as proximity and ownership, identify a range of semantic categories relevant to the notion of place, and offer an exhaustive analysis of how one particularly popular local feature - castles - is referred to in our data. Beyond identifying how the three local areas differ with respect to the platial attachment associated with them, this paper offers lists of keywords for each of the identified platial semantic categories as a basis for future studies in the field. Our findings further suggest that ownership terminology, time references, and spatial inferences frequently characterise expressions of place appreciation, in different ways in English and Welsh.
尽管“地方”概念在人文地理学及其他学科中很突出,但令人惊讶的是,人们对地方语言的理解却很差。柏拉图式的研究涉及人类与纯粹(几何和认知)空间方面之外的地方的关系,其语言特征得到了充分的研究。本文对英语和威尔士语中的平台语进行了深入的案例研究,有助于更好地理解人们如何使用语言来描述他们对一个地方的依恋。我们请72人描述北威尔士的三个地方,每一个地方的特色,以及进一步的问题。我们从一系列定性语言特征的角度来探索反应,这些特征表明了邻近性和所有权等方面,确定了一系列与地点概念相关的语义类别,并对我们的数据中如何提及一个特别流行的地方特征——城堡——进行了详尽的分析。除了确定三个局部区域在与之相关的平台依恋方面的差异外,本文还为每个已确定的平台语义类别提供了关键词列表,作为该领域未来研究的基础。我们的研究结果进一步表明,所有权术语、时间参考和空间推断经常以不同的方式在英语和威尔士语中表征地方欣赏的表达。
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引用次数: 2
期刊
Journal of Spatial Information Science
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