Zhengwei Sui's research while affiliated with Peking University and other places

Publications (18)

Article
Full-text available
Most existing human mobility literature focuses on exterior characteristics of movements but neglects activities, the driving force that underlies human movements. In this research, we combine activity-based analysis with a movement-based approach to model the intra-urban human mobility observed from about 15 million check-in records during a yearl...
Article
Full-text available
The article revisits spatial interaction and distance decay from the perspective of human mobility patterns and spatially-embedded networks based on an empirical data set. We extract nationwide inter-urban movements in China from a check-in data set that covers half a million individuals within 370 cities to analyze the underlying patterns of trips...
Article
The article revisits spatial interaction and distance decay from the perspective of human mobility patterns and spatially-embedded networks based on an empirical data set. We extract nationwide inter-urban movements in China from a check-in data set that covers half million individuals and 370 cities to analyze the underlying patterns of trips and...
Conference Paper
Distributed metadata management is an efficient way to address the huge data of mineral information resources, which are usually distributed stored. In this paper, existing related metadata standards of mineral resource are firstly explored, based on which three typical kinds of metadata management mode, centralized metadata management mode, distri...
Conference Paper
The Cloud is considered to be an important platform for the execution of scientific applications such as scientific workflows. Effective plan and management are desired in complex spatial analysis and decision applications. Geospatial workflow provides a scientific solution to manage such geospatial processes; it can define geospatial processes pre...
Article
Clouds are integral part in 3D-GIS visualization, without them 3D scene seem unrealistic. The paper presents a technical framework to simulate clouds from macroscopic to microcosmic scale in Global 3D-GIS. In the case of the macroscopic scale, which means the viewpoint is far away from the 3D scene in 3D-GIS, cloud was expressed with semi-transpare...
Article
Large gap of supply and demand for mineral resources brings an urgent need to develop technology and methods for mineral exploration. Metallogenic prediction plays a leading role in mineral exploration. In consideration of current software platform we used and characteristics of specific metallogenic prediction method, the efficiency and quality of...
Article
A rapid visualization method of GIS vector data on 3D terrain is proposed in this paper, including the organization of 3D vector data based on a quad-tree structure, the way to spatialize 2D vector data with terrain matching and methods to render a large amount of vector objects in a 3D scene. In the preprocessing procedure, vector data is extracte...
Article
Aiming at the problem that the efficiency of mass vector data rendering in global 3D GIS is low, this paper put forward a new way of processing and scheduling the data. The problem of crack phenomenon after the compression of public boundary in LOD model of vector data have been solved by the way based on the Douglas-Pecuker algorithm. In addition,...
Article
Although the algorithm for computing viewshed based on reference planes (the RP viewshed algorithm) doesn't need to use DEM interpolation method and is more efficient than the R3 algorithm. However, its result in the terrain of the "peaks and valleys" still has a big difference with the result of the R3 algorithm. For one thing, this paper deeply a...
Conference Paper
How to use the 3D (three-dimensional) modeling techniques better is the core problem in Digital City, which is also a harsh topic during the development of 3D GIS. Key problems in current 3D modeling techniques used in 3D GIS applications are discussed in this paper, and 2D and 3D interactively automatic construction technology of 3D model is prese...
Conference Paper
3D Models have become important form of geographic data beyond conventional 2D geospatial data. Buildings are important marks for human to identify their environments, because they are close with human life, particularly in the urban areas. Geographic information can be expressed in a more intuitive and effective manner with architectural models be...
Conference Paper
In the extension process of the Digital City, there are many geographic information application platforms using three-dimensional architectural models, but the aim is only to create three-dimensional view effects. The abundant data of models is not fully used. The purpose of this paper is to make a preliminary exploration on application models of t...
Conference Paper
With the rapid development of Digital Earth System, vector data has been widely used as an important data model. Visualization methods to vector data on a Digital Earth System have got more attention. So far, the existing methods can be divided into geometry-based and texture-based approaches basically, and each kind of method applies to different...
Conference Paper
The construction of three-dimensional digital city is an important application area of GIS technology, and construction of large scale city 3D building scene based on 2D building outline is a method to construct three-dimensional digital scene. This article makes a study of using ArcSDE to store the Shape files in SQL Server database, and then uses...
Conference Paper
Energy shortage brings the challenge of "high-efficiency, high-quality" to evaluation of mineral resources. Subject to conditions, general softwares for evaluation of mineral resources are mainly used in the stand-alone environment, while geological spatial data are often cross-regional, cross-platform and stored distributed. With the rapid develop...
Conference Paper
This paper mainly focuses on non-recursive algorithm on the base of the quad-tree for the situation that some data is missing during real-time visualization of massive multiplex dataset. This study introduces different kinds of basic data structures, including wait-static, wait-queue, main-static, missing-static and missing-queue. Upper level of th...
Article
The real world is a three-dimensional (3D) space requiring that 3D geospatial information applications be developed in alignment with the observer’s visual and perceptive habits. Particularly, D building model data are required in a wide range of areas such as urban planning, environmental protection, real estate management and emergency response....

Citations

... The obtained results suggest the need for further research. Specifically, social media data are informative sources for studying key features of human mobility (Hasan & Ukkusuri, 2014;Isaacman et al., 2011;Sirkeci & Yucesahin, 2020;Wang et al., 2015;Wu et al., 2014). Therefore, spatial simulations can be developed to forecast the geographical impacts of transportation investment, urban planning, government policy and climate change (Haase et al., 2010;Hermes & Poulsen, 2012;Ma et al., 2014;Subbiah et al., 2013;Zhang et al., 2014). ...
... However, using distributed metadata storage raises new challenges that metadata models cannot overcome, such as metadata inconsistencies and redundancy. To deal with these issues, some authors have suggested new architectures that provide unified frameworks [27] [28] to manage distributed Metadata and enable effective interoperability of metadata. ...
... Cloud based SDI is based Service Oriented Architecture which allows the service creation, discovery, orchestration and monitoring to be performed at the endof cloud provider (26). Aly and Labib divided the Cloud GIS architecture to six layers, Client Layer, Cloud GIS Application layer, Data Management layer, Storage layer, Platform layer and Infrastructure layer (27). The architecture of Mobile Cloud GIS follows the client server architecture which composed of the following modules user interface, business logic, GIS functions, data storage and access, these modules are developed as independent modules, this architecture is a multi-tier architecture which composed of client tier, communication tier, application tier, GIS server tier and Data tier. in this architecture client tier refers to the mobile application that enable the users to interact with geospatial data and geospatial analysis tools (28). ...
... "). Furthermore, the online platform provides viewers with a place to meet and share their viewing experience, leading to a large number of audience check-ins, which usually include the viewer's location (Liu et al., 2014). For instance, a viewer may write something like "I, who is from Chongqing, finished the movie today. ...
... In recent years, information technology has developed rapidly, and big data analysis has played an important role in urban studies [55][56][57]. In addition, as portal sites using cell phone data have become more common, the analysis of urban hot spots and public centers using these data connections has also increased [14,[58][59][60][61]. ...
... In order to improve the accuracy of the XDraw algorithm, Izraelevitz et al. traced back along the line-of-sight and included more points in computation [12]. Zhi et al. introduced the historical minimum visual elevation of each target point into computation as additional data [13]. Zhu et al. proposed the HiXDraw algorithm, using contribution points instead of reference points in XDraw as the basis for computing the visibility of the target points, thus avoiding the interference of irrelevant visible points (referred to as 'chunk distortion' in their work) on computational results [10]. ...
... Texture-based approaches rasterize the vector data into textures that are then mapped onto the terrain surface [56]. Geometry-based approaches (often used for the simultaneous representation of digital elevation data and vector data [52,57,58,59,60]) allow the geometry of the vector data to exist separately from the geometry of the terrain, albeit modified for consistency with the terrain shape [61]. Shadow volume-based approaches, such as that described in [51], extrude the vector geometry into polyhedrons that are then rendered into the stencil buffer to distinguish between visible and invisible parts of the scene. ...
... At the same time, the advent of modern web service technologies allows the possibility of 3D geospatial data to be distributed on the web. Yang et al. [5] have discussed the feasibility of representing 3D city building models as a kind of data resource service on the web which could also coexist with various web applications. Their approach to model 3D city buildings follows hierarchical representation based on structural details. ...
... Thus, a geometric modeling convention is proposed in this section. A convention modeling is also used in the study by [46], for a building construction project. ...
... The same is true in the geological domain, where research and development typically produces and analyzes large volumes of distributed heterogeneous geospatial data sets [3]. The applications and services that use geological spatial data have certain features, such as being cross-region and cross-domain and requiring real-time updating, focus on a certain application or service (e.g., the evaluation of mineral resource potential, the evaluation of geological disasters and the environment, and the evaluation of underground water) [4]. Furthermore, the geological spatial data that must be mobilized are usually distributed in different regions, different domains and different departments. ...