Jingnong Weng

Beihang University (BUAA) | BUAA · Department of Computer Application Engineering

Transportation data center has recently become a common practice of modern integrated transportation management in major cities of China. Being the convergence center of large-scale multi-source vehicle tracking data, it caused great challenge on GPS map-matching efficiency and privacy protection. In this paper, we propose a secure parallel map-mat...

This article portrays a concise review on an extensive range of state-of-art advancement in methodologies and applications for Digital China, which includes models, algorithms, theory framework, engineering technology, science methodology, practice applications, etc.

User interface aesthetics, among other design considerations, are considered to be one of the determinants of user satisfaction. Considered more of a subjective aspect, aesthetics have mostly been evaluated with intrusive approaches. However, according to the recent product quality model in ISO 25010, "aesthetics" is listed under the "usability" ch...

Digital Earth provides an excellent means for the visualization and analysis of the epidemic data. Currently the most of the epidemic data analysis is done only based on the data attributes such as number of victims, time of occurrence, type or intensity of the epidemic, etc. Most of the visualization of the epidemic is done merely using maps. Visu...

The WLFZ in the Three Gorges area is alternately controlled and influenced by both water ecosystem and terrestrial ecosystem. Its ecological vulnerability and instability are significant. Taking small watershed as a unit of assessment, we select population density, urbanization intensity, temperature, precipitation, and humidity and vegetation cove...

Learnability has been regarded as an important aspect of usability and considered a fundamental usability attribute. Yet, learnability is often overlooked as one of the most influential factors for the success of software applications especially Geographic Information Systems (GIS) applications. GIS Applications have seen a tremendous development d...

The concept of user experience has been given much importance in the contemporary human computer interaction research. However, modeling user experience requires quality evaluation schemes that are not restricted to the traditional concepts of usability only, where requirements have generally been task oriented. On the contrary, in addition to mode...

Learnability has been regarded as a fundamental usability attribute and plays a significant role for the success of software applications. Good learnability not only leads to a better productivity quickly but also plays a vital role in initial adoption or rejection of a technology. To evaluate and hence improve learnability, understanding the facto...

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...

The Web Content Aggregation Service based on Digital Earth geospatial framework is combined form of existing web content aggregation service and corresponding space position information retrieval. The customized service comprises three stages: web content acquisition, aggregation and distribution stage. This paper focuses on the first stage where t...

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...

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...

The framework model of the earth is the core framework of digital earth system, it directly affect the success of constructing digital earth system, and has a profound effect on the usability and user-friendly of the system. It can promote the speed of construction of digital earth system, and can enhance user's understanding of the digital earth s...

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...

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...

Three-dimensional (3D) city building models with its related information is an important part in the construction of Digital City and Digital Earth, and has been becoming a kind of staple resources on the web. Based on the characteristics of 3D building model, a service-oriented architecture and Web service technology for 3D city building models is...

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...

Gaussian pyramid framework (GPF) and Laplacian pyramid framework (LPF) are the two main frameworks used for transmission and structure of spatial image and geometric data. LPF is the main approach for progressive transmission of spatial image data. This paper discusses the issues in structure, transmission and storage efficiency of spatial data in...

With the rapid development of information technology, research on spatial moving objects has become popular in the area of information management. Based on discussions to fundamental question of moving objects and analysis of the survey in related research fields, an approach of services oriented management of spatial moving objects in three dimens...

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...

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....

A visual engine is the core of a Digital Earth system. There is a wide variety of functional requirements in Digital Earth system and different requirements correspond to different operations. Based on the development of the visual engine for ChinaStar, a 3D Digital China prototype software platform, and analysis of 3D Digital Earth platforms such...

Gaussian pyramid framework (GPF) and Laplacian pyramid framework (LPF) are the two main frameworks used for transmission and structure of spatial image and geometric data. LPF is the main approach for progressive transmission of spatial image data. This paper discusses the issues in structure, transmission and storage efficiency of spatial data in...

Organization and Management of mass multi-source spatial data are core functions of digital earth software which contribute directly to the availability and efficiency of the software itself. A novel organization and index method which combines the UTM latitude-longitude grids index and the dynamic level of detail model to organize data logically a...

3D city building models with their related information have increasingly become an important part and have a wide range of application areas in construction of digital city and digital earth, In view of the representation of D building model in hierarchy, an abstract of D building model based on structure details is studied, and a novel representat...

Large-scale 3D city building models has now become an indispensable part of digital globe information system. It is a big challenge how to make use of limited computer memory space and rendering ability to draw almost infinite city building models on the earth. In this paper, we focus discussion on how to improve the efficiency of management and re...

By analysis to the strengths and weakness of the existing virtual globe visualization engines, a component-based solution of virtual globe visualization engine is proposed in this paper, which includes two parts, the support library and the functional components. The support library provides essential support services for the normal operation of th...

“How do the rescue helicopters find out an optimized path to arrive at the site of a disaster as soon as possible?” or “How are the flight procedures over mountains and plateaus simulated?” and so on. In this paper a script language on spatial moving objects is presented by abstracting 3D spatial moving objects’ behavior when implementing moving ob...

There are three major research hotspots in efficient visualization techniques of high resolution remotely sensed data in network environment: the data organization and access in disk storage, the image data stitching and fitting methods, and the network transfers and access. In this paper a new method of “Big File” organization for improving the st...