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Modeling population distribution: A visual and quantitative analysis of gradient boosting and deep learning models for multi-output spatial disaggregation 人口分布建模:梯度提升和深度学习模型对多输出空间分类的可视化和定量分析
IF 2.4 3区 地球科学 Q2 GEOGRAPHY Pub Date : 2024-01-09 DOI: 10.1111/tgis.13130
Marina Georgati, João Monteiro, Bruno Martins, Carsten Keßler, Henning Sten Hansen
Spatially aggregated data on socio-demographic groups often fail to capture the population's spatial heterogeneity in cities. This poses challenges for urban planning, particularly when addressing the needs of groups such as migrants or families with children. Moreover, the commonly provided aggregated units, such as census tracts, vary in size and across data sources. Existing literature on disaggregation typically handles individual subgroups separately, ignoring their interrelations in the downscaling process. This article explores the potentials of multi-output regression models for simultaneous spatial downscaling of multiple groups and conducts a detailed spatial error analysis using individualized neighborhoods. We experiment with self-training gradient-boosting trees and fully convolutional neural networks, assessing the quality of results against ground truth data at the target resolution. We show that the evaluation of the disaggregated results at this detailed resolution requires unconventional methods. The methodology proves convenient and achieves high-accuracy results using input datasets of building features.
社会人口群体的空间汇总数据往往无法反映城市人口的空间异质性。这给城市规划带来了挑战,尤其是在满足移民或有子女家庭等群体的需求时。此外,人口普查区等通常提供的综合单位在规模和数据来源上也各不相同。现有的分类文献通常单独处理单个子群体,忽略了它们在缩小比例过程中的相互关系。本文探讨了多输出回归模型同时对多个群体进行空间降尺度处理的潜力,并利用个性化邻里进行了详细的空间误差分析。我们试验了自训练梯度提升树和全卷积神经网络,根据目标分辨率的地面实况数据评估了结果的质量。我们发现,在这种详细分辨率下评估分解结果需要采用非常规方法。事实证明,这种方法很方便,使用建筑物特征的输入数据集就能获得高精度的结果。
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引用次数: 0
Wemap-based direction model for individuals with limited spatial orientation skills 为空间定向能力有限的人设计基于地图的方向模型
IF 2.4 3区 地球科学 Q2 GEOGRAPHY Pub Date : 2024-01-09 DOI: 10.1111/tgis.13129
Xiaolong Wang, Haowen Yan, Zhuo Wang, Xiaorong Gao
Spatial direction relationships act as links between visually perceived data and natural language in cartography and geographic information systems. Although the existing direction models are able to compute spatial direction relationships, their adaptability to unique users of Wemap, such as individuals with limited spatial orientation skills (ILSOS), is minimal. In particular, the ability to identify locations and directions on maps can pose serious challenges for ILSOS. As such, a Wemap-based direction model was developed in this study to address this deficiency, specifically targeting ILSOS. To address these challenges, a model for calculating spatial direction relationships was constructed. Subsequently, a questionnaire was administered to verify the consistency of the proposed model with the spatial perceptions of ILSOS. The experimental results demonstrate that (1) the proposed model can calculate the spatial direction relationships between a reference object and source target based on absolute reference frames; (2) ILSOS account for a certain proportion of the population and have a superior ability to distinguish spatial over geographic directions; and (3) the calculation results of the proposed model are consistent with the spatial cognition of ILSOS.
空间方向关系是制图学和地理信息系统中视觉感知数据与自然语言之间的纽带。虽然现有的方向模型能够计算空间方向关系,但它们对 Wemap 特殊用户(如空间定向能力有限的个人 (ILSOS))的适应性极低。特别是,在地图上识别位置和方向的能力会给 ILSOS 带来严峻挑战。因此,本研究开发了一个基于 Wemap 的方向模型,以解决这一不足,特别是针对 ILSOS。为了应对这些挑战,我们构建了一个计算空间方向关系的模型。随后,进行了问卷调查,以验证所提出的模型与 ILSOS 空间感知的一致性。实验结果表明:(1) 所提出的模型能够基于绝对参照系计算参照物与源目标之间的空间方向关系;(2) ILSOS 占一定比例的人群,其区分空间方向的能力优于地理方向;(3) 所提出模型的计算结果与 ILSOS 的空间认知一致。
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引用次数: 0
QuadGridSIM: A quadrilateral grid‐based method for high‐performance and robust trajectory similarity analysis QuadGridSIM:基于四边形网格的高性能鲁棒轨迹相似性分析方法
IF 2.4 3区 地球科学 Q2 GEOGRAPHY Pub Date : 2024-01-04 DOI: 10.1111/tgis.13126
Juqing Liu, Jun Li, Linwei Qiao, Mingke Li, Emmanuel Stefanakis, Xuesheng Zhao, Qian Huang, Hao Wang, Chengye Zhang
Measuring trajectory similarity is a fundamental algorithm in trajectory data mining, playing a key role in trajectory clustering, pattern mining, and classification, for instance. However, existing trajectory similarity measures based on vector representation have challenges in achieving both fast and accurate similarity measurements. On one hand, most existing methods have a high computational complexity of O(n × m), resulting in low efficiency. On the other hand, many of them are sensitive to trajectory sampling rates and lack of accuracy. This article proposes QuadGridSIM, a quadrilateral grid‐based method for trajectory similarity analysis, which enables high‐performance trajectory similarity measure without the cost of low effectiveness. Specifically, we first realize the multiscale coding representation of trajectory data based on quadrilateral discrete grids. Then, a novel trajectory similarity measure is defined to reduce the computational complexity of O(n). Several effectiveness properties of QuadGridSIM are further optimized, including the spatial overlap, directionality, symmetry, and robustness to sampling rate variations. Experimental results based on real‐world and simulated taxi trajectory data indicate that QuadGridSIM outperforms most of the other tested algorithms developed previously in terms of effectiveness, particularly in its robustness regarding trajectory sampling rates. Furthermore, QuadGridSIM exhibits superior performance and is approximately one order of magnitude faster than previous methods in the literature. QuadGridSIM provides a solution to the low‐efficiency problem of massive trajectory similarity analysis and can be applied in many application scenarios, such as route recommendation and suspect detection.
轨迹相似性测量是轨迹数据挖掘的基本算法,在轨迹聚类、模式挖掘和分类等方面发挥着关键作用。然而,现有的基于向量表示的轨迹相似性测量方法在实现快速准确的相似性测量方面存在挑战。一方面,大多数现有方法的计算复杂度高达 O(n × m),导致效率低下。另一方面,许多方法对轨迹采样率敏感,缺乏准确性。本文提出的 QuadGridSIM 是一种基于四边形网格的轨迹相似性分析方法,它能实现高性能的轨迹相似性度量,而不以低效为代价。具体来说,我们首先实现了基于四边形离散网格的轨迹数据多尺度编码表示。然后,定义了一种新的轨迹相似性度量方法,以降低 O(n) 的计算复杂度。此外,还进一步优化了 QuadGridSIM 的若干有效性,包括空间重叠性、方向性、对称性和对采样率变化的鲁棒性。基于真实世界和模拟出租车轨迹数据的实验结果表明,QuadGridSIM 在有效性方面优于之前开发的大多数其他测试算法,尤其是在轨迹采样率方面的鲁棒性。此外,QuadGridSIM 还表现出卓越的性能,其速度比以往文献中的方法大约快一个数量级。QuadGridSIM 为大规模轨迹相似性分析的低效率问题提供了一种解决方案,可应用于路线推荐和可疑物检测等多种应用场景。
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引用次数: 0
Mining public behavior patterns from social media data during emergencies: A multidimensional analytical framework considering spatial–temporal–semantic features 从紧急情况下的社交媒体数据中挖掘公众行为模式:考虑空间-时间-语义特征的多维分析框架
IF 2.4 3区 地球科学 Q2 GEOGRAPHY Pub Date : 2024-01-02 DOI: 10.1111/tgis.13125
Xuehua Han, Juanle Wang, Xiaodong Zhang, Liang Wang, Dandan Xu
Studying human behavioral patterns from social media data is an important part of emergency management. However, the multidimensional characteristics of social media data have rarely been fully utilized. This study proposes a multidimensional analytical framework for social media user behavior that integrates time–geographic–semantic features. The framework defines the spatiotemporal semantic multidimensional relationship of social media user behavior and maps it into a time–geographic–semantic (TGS) cube, based on which a TGS-weighted similarity measure was created. We then applied a spectral clustering algorithm to cluster the trajectories of the user behavior. Subsequently, a prefix-projected pattern growth algorithm was used to mine frequent semantic patterns from the clustering results and analyze their spatiotemporal distribution characteristics. Taking the COVID-19 pandemic as a case study, we analyzed Weibo user behavior in China from January 9 to March 10, 2020. The results showed that the clustering of TGS similarity was better than that of the commonly used edit distance on real and longest common subsequences. Five semantic patterns of public responses were identified during the COVID-19 pandemic. The semantic patterns of categories 1, 2, 4, and 5 were “spindle-shaped,” meaning that their core semantics were stable and concentrated on one or several topics despite the frequent semantic changes in the middle stage. Category 3 was “wave-shaped,” indicating that their semantics fluctuated between serval topics during the pandemic. This discovery shows that the framework is suitable for analyzing and comprehensively understanding public behavior during pandemic emergencies. This framework has good universality and great potential for extension to other emergencies.
从社交媒体数据中研究人类行为模式是应急管理的重要组成部分。然而,社交媒体数据的多维特性很少得到充分利用。本研究提出了一个整合了时间-地理-语义特征的社交媒体用户行为多维分析框架。该框架定义了社交媒体用户行为的时空语义多维关系,并将其映射到时间-地理-语义(TGS)立方体中,在此基础上创建了 TGS 加权相似度量。然后,我们采用光谱聚类算法对用户行为轨迹进行聚类。随后,我们使用前缀投射模式增长算法从聚类结果中挖掘频繁语义模式,并分析其时空分布特征。我们以 COVID-19 大流行为案例,分析了中国在 2020 年 1 月 9 日至 3 月 10 日期间的微博用户行为。结果表明,在真实子序列和最长公共子序列上,TGS相似度的聚类效果优于常用的编辑距离。在 COVID-19 大流行期间,确定了公众反应的五种语义模式。类别 1、2、4 和 5 的语义模式呈 "纺锤形",即尽管中期语义变化频繁,但其核心语义稳定,且集中在一个或几个主题上。第 3 类呈 "波浪形",表明其语义在大流行期间在几个主题之间波动。这一发现表明,该框架适用于分析和全面理解突发大流行病期间的公众行为。该框架具有良好的普适性,在其他突发事件中也有很大的推广潜力。
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引用次数: 0
A new hierarchical analysis framework of building heights: Towards a more intuitive understanding of 3D urban structure 新的建筑高度分层分析框架:更直观地了解三维城市结构
IF 2.4 3区 地球科学 Q2 GEOGRAPHY Pub Date : 2023-12-28 DOI: 10.1111/tgis.13123
Ling Yang, Xingyu Zhou, Xin Yang, Yang Chen, Haiping Zhang, Jiaming Na
Understanding the 3D spatial structure of a city is increasingly essential for addressing various environmental and management issues, surpassing the importance of traditional 2D analysis. However, existing studies neglect the diversity of building height and still lack a clear description of 3D urban structure. This article proposes a new framework to uncover the 3D urban structure. Firstly, kernel density is employed to reveal the hierarchical spatial structure of buildings and the contour tree method is improved to quantitatively measure the spatial diversity and complexity. Then, the 3D urban structure is abstracted by spatial interpolation after feature filtration. Finally, this framework is applied to the central area of Chengdu City, revealing that: (1) Spatial structures of buildings with different heights exhibit significant diversity, location preference, and complexity; and (2) A globally “depression” 3D urban structure with low center—high periphery is obviously identified. This framework provides an effective way to reveal the 3D urban structure in a more intuitive and clearer way from various disordered urban buildings, which can be transferable to other cities and further facilitate sustainable planning and development of cities.
了解城市的三维空间结构对于解决各种环境和管理问题越来越重要,其重要性已超过传统的二维分析。然而,现有研究忽视了建筑高度的多样性,仍然缺乏对三维城市结构的清晰描述。本文提出了一个揭示三维城市结构的新框架。首先,采用核密度揭示建筑物的层次空间结构,并改进轮廓树方法,定量测量空间多样性和复杂性。然后,在特征过滤后通过空间插值对三维城市结构进行抽象。最后,将该框架应用于成都市中心区域,结果表明(1) 不同高度建筑的空间结构表现出显著的多样性、位置偏好性和复杂性;以及 (2) 一个中心低、外围高的全局性 "洼地 "三维城市结构被明显识别出来。该框架为从各种无序的城市建筑中更直观、更清晰地揭示三维城市结构提供了有效途径,可推广到其他城市,进一步促进城市的可持续规划和发展。
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引用次数: 0
Evaluating the effect of urban flooding on spatial accessibility to emergency shelters based on social sensing data 基于社会传感数据评估城市洪水对紧急避难所空间可达性的影响
IF 2.4 3区 地球科学 Q2 GEOGRAPHY Pub Date : 2023-12-28 DOI: 10.1111/tgis.13127
Shaonan Zhu, YiXin Jiang, Jun Zhang, Qiang Dai, Xin Yang
Urban flooding is a growing source of natural hazards, significantly threatening the safety of sustainable development in cities. The distribution of flood risks is heterogeneous, so it is crucial to allocate emergency resources reasonably. This article develops an analytical framework to evaluate the effect of urban flooding on emergency responses based on social sensing data. Initially, we designed a Weibo search pattern and used natural language processing technologies to get high-risk flood points. Then, assuming that such high-risk flood points can disrupt traffic, we assessed urban emergency shelter accessibility after flooding events. Finally, we carried out an evaluation of spatial fairness between population and emergency shelter accessibility through spatial correlation analysis. We analyzed the urban area of Nanjing as a case study, extracting 37 high-risk flood points from the past 5 years. The results highlight that existing emergency shelters fall short in accommodating the needs of urban residents under disaster conditions. This disparity is notably amplified in high-risk flood points. By measuring the impact of flooding quantitatively, we expect to promote a more comprehensive management on urban flood risks.
城市洪水是一种日益严重的自然灾害,严重威胁着城市的可持续发展安全。洪水风险的分布具有异质性,因此合理分配应急资源至关重要。本文基于社会感知数据建立了一个分析框架,以评估城市洪灾对应急响应的影响。首先,我们设计了一种微博搜索模式,并利用自然语言处理技术获得了高风险洪水点。然后,假设这些高风险洪水点会扰乱交通,我们评估了洪水事件后城市应急避难所的可达性。最后,我们通过空间相关性分析评估了人口与应急避难场所可达性之间的空间公平性。我们以南京市区为例进行了分析,提取了过去 5 年中的 37 个高风险洪水点。结果表明,现有的应急避难场所无法满足灾害条件下城市居民的需求。这种差距在高风险洪涝点明显扩大。通过量化测量洪水的影响,我们希望能促进对城市洪水风险进行更全面的管理。
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引用次数: 0
Revealing the mobile sensing powers of semi-random and deterministic “drive-by” vehicle fleets 揭示半随机和确定性 "驾车 "车队的移动传感能力
IF 2.4 3区 地球科学 Q2 GEOGRAPHY Pub Date : 2023-12-25 DOI: 10.1111/tgis.13124
Jincheng Jiang, Junjie Wang, Hongming Yao, Zhenxin Zhang, Zhihua Xu
The utilization of mobile sensing through the deployment of sensors on third-party vehicles that pass by an area offers notable benefits in terms of spatiotemporal coverage, precision, timeliness, and cost-effectiveness for monitoring urban environments. However, the diverse travel behaviors exhibited by different types of vehicle fleets result in varying levels of sensing powers. Drawing inspiration from these phenomena, this study quantifies and compares the travel patterns and sensing powers of bus and taxi fleets. The experimental findings unveiled several noteworthy laws, such as a diminishing rate of increase in sensing power with the stable increasing vehicle number, the high sensing power exhibited by taxis, the comparable spatial coverage between buses, and the relatively low uncertainty associated with buses' sensing power. Furthermore, the impact of travel patterns (i.e., semi-random behavior of taxis and deterministic behavior of buses) on the powers of mobile sensing was revealed. The aforementioned findings provide valuable insights for the development of efficient mobile sensing schemes and hold significant relevance for the implementation of smart city infrastructure.
通过在经过某一区域的第三方车辆上部署传感器来利用移动传感技术,在时空覆盖范围、精确度、及时性和成本效益方面为监测城市环境提供了显著的优势。然而,不同类型的车队所表现出的不同出行行为导致了不同程度的传感能力。本研究从这些现象中汲取灵感,对公交车和出租车的出行模式和传感能力进行了量化和比较。实验结果揭示了几个值得注意的规律,如随着车辆数量的稳定增加,感知能力的增加率逐渐减小;出租车表现出较高的感知能力;公交车之间的空间覆盖率相当;公交车感知能力的不确定性相对较低。此外,研究还揭示了出行模式(即出租车的半随机行为和公交车的确定性行为)对移动感知能力的影响。上述研究结果为开发高效的移动传感方案提供了宝贵的见解,并对智能城市基础设施的实施具有重要意义。
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引用次数: 0
A novel trajectory similarity measurement method based on node-sequence hierarchical digraph 基于节点序列分层数字图的新型轨迹相似性测量方法
IF 2.4 3区 地球科学 Q2 GEOGRAPHY Pub Date : 2023-12-10 DOI: 10.1111/tgis.13121
Yue Fan, Huiwen Wang, Lihong Wang, Shu Guo, Jing Liu
Trajectory similarity measurement is a basic and vital task in trajectory data mining, which has attracted extensive research in the past decades. Recent works focused on the sequence and hierarchy property of trajectories to construct similarity measurements. However, these methods ignore the user information on the visiting locations, such as semantic and time distribution. In light of this, a novel trajectory similarity measurement based on Node-Sequence Hierarchical Digraph (NSHD) framework is proposed in this article. We first propose a Time-Weighted Stay Point Detection (TWSPD) method to extract real visiting locations of users more accurately. Then, the nodes of digraph are obtained by clustering users' stay points and the edges of digraph are sequence information that users move between these nodes. An Advanced Earth Mover's Distance (AEMD) is proposed to measure the node similarity between users, considering visiting time distribution and semantic information simultaneously. Both node and sequence similarities are used to calculate the similarity score to obtain the final trajectory similarity measurement. Experiments on Geolife and T-Drive datasets show that our proposed method offers competitive performance with mean reciprocal rank values reaching 96.01 and 81.26%, which outperforms related trajectory similarity measurements by more than 10 and 15%.
轨迹相似性测量是轨迹数据挖掘的一项基本而重要的任务,在过去几十年中吸引了广泛的研究。最近的研究主要集中在轨迹的序列和层次属性来构建相似性测量。然而,这些方法忽略了用户访问位置的信息,如语义和时间分布。有鉴于此,本文提出了一种基于节点-序列层次图(NSHD)框架的新型轨迹相似性测量方法。我们首先提出了一种时间加权停留点检测(TWSPD)方法,以更准确地提取用户的真实访问位置。然后,通过对用户停留点的聚类得到数字图的节点,数字图的边是用户在这些节点之间移动的序列信息。我们提出了一种高级地球移动距离(AEMD)来测量用户之间的节点相似度,同时考虑了访问时间分布和语义信息。节点和序列相似性都用于计算相似性得分,从而获得最终的轨迹相似性测量结果。在 Geolife 和 T-Drive 数据集上的实验表明,我们提出的方法具有极高的性能竞争力,平均倒数等级值分别达到 96.01% 和 81.26%,比相关的轨迹相似性测量方法高出 10% 和 15%。
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引用次数: 0
Analyzing the spatial interactions between rainfall levels and flooding prediction in São Paulo 分析圣保罗降雨量与洪水预测之间的空间相互作用
IF 2.4 3区 地球科学 Q2 GEOGRAPHY Pub Date : 2023-12-09 DOI: 10.1111/tgis.13116
Wagner da Silva Billa, Leonardo Bacelar Lima Santos, Rogério Galante Negri
Rainfall is one of the primary triggers for many geological and hydrological natural disasters. While the geological events are related to mass movements in land collapse due to waterlogging, the hydrological ones are usually assigned to runoff or flooding. Studies in the literature propose predicting mass movement events as a function of accumulated rainfall levels recorded at distinct periods. According to these approaches, a two-dimensional rainfall levels feature space is segmented into the occurrence and non-occurrence decision regions by an empirical critical curve (CC). Although this scheme may easily be extended to other purposes and applications, studies in the literature need to discuss its use for flooding prediction. In light of this motivation, the present study is unfolded in (1) verifying that defining CCs in the rainfall levels feature space is a practical approach for flooding prediction and (2) analyzing how geospatial components interact with rainfall levels and flooding prediction. A database containing the rainfall levels recorded for flooding and non-flooding events in São Paulo city, Brazil, regarding the period 2015–2016, was considered in this study. The results indicate good accuracy for flooding prediction using only partial rain, which can be improved by adding physical characteristics of the flooding locations, demonstrating a direct correlation with spatial interactions, and rainfall levels.
降雨是许多地质和水文自然灾害的主要诱因之一。地质事件与内涝导致的土地塌陷大规模移动有关,而水文事件通常与径流或洪水有关。文献研究建议根据不同时期记录的累积降雨量来预测大规模移动事件。根据这些方法,通过经验临界曲线(CC)将二维降雨量特征空间划分为发生和未发生决策区域。虽然这种方法很容易扩展到其他目的和应用中,但文献研究需要讨论其在洪水预测中的应用。有鉴于此,本研究在以下两个方面展开:(1) 验证在降雨量特征空间中定义 CC 是洪水预测的实用方法;(2) 分析地理空间要素如何与降雨量和洪水预测相互作用。本研究考虑了一个数据库,其中包含巴西圣保罗市 2015-2016 年期间洪水和非洪水事件的降雨量记录。研究结果表明,仅使用部分降雨量就能很好地预测洪水的准确性,通过增加洪水地点的物理特征,可以提高洪水预测的准确性,这表明空间相互作用与降雨量直接相关。
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引用次数: 0
Implementation of 3D spatial planning through the integration of the standards 通过整合标准实施三维空间规划
IF 2.4 3区 地球科学 Q2 GEOGRAPHY Pub Date : 2023-12-08 DOI: 10.1111/tgis.13122
Dogus Guler
To plan future land use, zoning plans (i.e., spatial plans) are prepared to get the most out of land for both the public and the government. These plans manifest which facilities can be built and where they can be built on land based on defined requirements such as building height and road length. The Land Administration Domain Model (LADM) is well-known and widely used standard for describing Rights, Restrictions, and Responsibilities (RRRs) with respect to land and buildings. The next version of the standard will contain the Spatial Plan Information (SPI) part to enable better land-use planning. Three-dimensional (3D) land-use planning has gained attention to delineate detailed requirements inclusively and allow different spatial analysis that provides a basis for decisions in the planning. Data standards pertaining to 3D geoinformation are vital to put into practice 3D spatial planning. To this extent, CityJSON is proposed for the effortless and efficient use of 3D city models. This article thus first aims to extend the CityJSON schema based on the proposed SPI part of the LADM such that it allows modeling, storing, visualizing, and utilizing the features and attributes required for the implementation of 3D spatial planning. Then, the usability of the proposed extension schema is demonstrated by the real-world use cases that benefit from the exemplary CityJSON files that are created based on approved zoning plans in the country. The results of this study show that there is an important opportunity coming from the integration of international standards that enables semantic information along with their spatial counterparts within 3D spatial planning.
为了规划未来的土地用途,需要编制分区规划(即空间规划),以便为公众和政府最大限度地利用土地。这些规划根据建筑物高度和道路长度等规定要求,明确了哪些设施可以建造,以及可以在哪些地方建造。土地管理域模型 (LADM) 是著名的、广泛使用的标准,用于描述土地和建筑物的权利、限制和责任 (RRR)。该标准的下一个版本将包含空间规划信息 (SPI) 部分,以便更好地进行土地利用规划。三维(3D)土地利用规划已引起人们的关注,因为它可以全面划分详细要求,并允许进行不同的空间分析,为规划决策提供依据。与三维地理信息相关的数据标准对于三维空间规划的实施至关重要。为此,我们提出了 CityJSON,以便轻松高效地使用三维城市模型。因此,本文首先以拟议的 LADM SPI 部分为基础,扩展 CityJSON 模式,使其能够对实施三维空间规划所需的特征和属性进行建模、存储、可视化和利用。然后,通过实际使用案例来证明拟议扩展模式的可用性,这些案例得益于根据国家批准的分区规划创建的示例性 CityJSON 文件。这项研究的结果表明,国际标准的整合为三维空间规划中语义信息及其空间对应信息的整合提供了重要机会。
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引用次数: 0
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