Bailang Yu

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—The effective representation of thematic data in 3D GIS can not only visualize tabular data intuitively in 3D environment, but also enable users to analyze thematic data directly on 3D GIS platform, thereby facilitating the decision making process. This paper proposes a method for representing thematic data in 3D GIS. Three steps are included in the(More)
Three-dimensional (3D) GIS is gaining more and more acceptance among both scientists and the general public. Though powerful in data visualization, 3D GIS is comparatively weak in geospatial analysis. In order to enhance 3D GIS's analysis capability, we present an approach for integrating geospatial processing services into 3D GIS. The architecture of our(More)
This paper presents a collaborative 3D GIS to support public participation. Realizing that public-involved decision making is often a multi-stage process, the proposed system is designed to provide coherent support for collaborations in the different stages. We differentiate ubiquitous participation and intensive participation, and identify their suitable(More)
Urban areas of interest (AOI) refer to the regions within an urban environment that attract people's attention. Such areas often have high exposure to the general public, and receive a large number of visits. As a result, urban AOI can reveal useful information for city planners, transportation analysts, and location-based service providers to plan new(More)
Surface depressions are abundant in topographically complex landscapes, and they exert significant influences on hydrological, ecological, and biogeochemical processes at local and regional scales. The increasing availability of high-resolution topographi-cal data makes it possible to resolve small surface depressions. By analogy with the reasoning process(More)
—Traditional data collection methods for geological investigation, profile measurement, and other field survey in the research community of geosciences are generally based on the manual measuring and recording by the investigators. The most popular " instruments " used in the traditional survey are pencils as well as printed hard copy charts. The methods(More)
—Spatial indexing is one of the most important techniques in the field of spatial data management. Many kinds of techniques of spatial indexing have been successfully developed, and each of them has advantages towards special applications. As a type of spatial data structure, Hierarchical Triangular Mesh (HTM) has excellent features of global continuity,(More)
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