Research on National 1:50000 Topographic Cartography Data Organization

Wu, Chenchen; Liu, J.; Li, Z.

doi:10.5194/isprsannals-ii-4-83-2014

Cited by 4 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The AR map stylization sub module is responsible for the batch unit objects output from the OpenGL graphics library. According to the map rules [35,36], it carries out the stylized objects such as symbols for area, lines, points, annotations, vector tiles and grid tile symbols and image symbols, and calls on the graphics library API operation to render these stylized objects as visual data. Finally, the OpenGL state machine is used to control the data exchange API of the rendering pipeline, and the visualization results are displayed on the screen.…”

Section: Architecture Of the Augmented-reality Universal Graphics Library Enginementioning

confidence: 99%

An Efficient, Platform-Independent Map Rendering Framework for Mobile Augmented Reality

Huang

Wang

et al. 2021

IJGI

View full text Add to dashboard Cite

With the extensive application of big spatial data and the emergence of spatial computing, augmented reality (AR) map rendering has attracted significant attention. A common issue in existing solutions is that AR-GIS systems rely on different platform-specific graphics libraries on different operating systems, and rendering implementations can vary across various platforms. This causes performance degradation and rendering styles that are not consistent across environments. However, high-performance rendering consistency across devices is critical in AR-GIS, especially for edge collaborative computing. In this paper, we present a high-performance, platform-independent AR-GIS rendering engine; the augmented reality universal graphics library (AUGL) engine. A unified cross-platform interface is proposed to preserve AR-GIS rendering style consistency across platforms. High-performance AR-GIS map symbol drawing models are defined and implemented based on a unified algorithm interface. We also develop a pre-caching strategy, optimized spatial-index querying, and a GPU-accelerated vector drawing algorithm that minimizes IO latency throughout the rendering process. Comparisons to existing AR-GIS visualization engines indicate that the performance of the AUGL engine is two times higher than that of the AR-GIS rendering engine on the Android, iOS, and Vuforia platforms. The drawing efficiency for vector polygons is improved significantly. The rendering performance is more than three times better than the average performances of existing Android and iOS systems.

show abstract

Section: Architecture Of the Augmented-reality Universal Graphics Library Enginementioning

confidence: 99%

An Efficient, Platform-Independent Map Rendering Framework for Mobile Augmented Reality

Huang

Wang

et al. 2021

IJGI

View full text Add to dashboard Cite

show abstract

“…In cartography and geographic information system (GIS), point symbols, linear symbols, and area symbols are the three basic presentation methods for vector data (Kersting and Döllner 2002, Wen et al 2013, Wu et al 2014. Regarding linear map elements, the existing drawing technologies continue to face difficulties in applying complex line types.…”

Section: Introductionmentioning

confidence: 99%

A function-based linear map symbol building and rendering method using shader language

Yue

Yang

Chen

et al. 2015

International Journal of Geographical Information Science

View full text Add to dashboard Cite

Maps are widely used to visualize geo-information so that map users can develop related understandings about the real world. Such a process for communicating information is largely dependent on the rendering of map elements using different symbols (points and linear and area symbols). To meet the demand of more dynamic and comprehensive visualization in map rendering, it is essential to improve the rendering efficiency. This paper focuses on these research topics, especially the difficulty in constructing and drawing linear map symbols. By employing shader language, a function-based linear symbol building and rendering method is presented in this paper. The basic idea of this function-based method is to build a map-rendering solution that employs graphic processing unit (GPU) acceleration technology to improve the rendering efficiency. A 'function' is used to represent the algorithm that draws certain simple or complex linear map symbols. This function reflects the structure of a linear map symbol (describing the symbol construction information) and also the rendering process of the symbolized linear map elements (handled on a per-pixel basis by the shader program). Based on the Open Geospatial Consortium (OGC), Styled Layer Descriptor (SLD) specifications, four basic line types (i.e., solid lines, dashed lines, gradient color lines, and transition lines) are implemented in the proposed method, and the implementation of line markers, line joins and line caps is also discussed. Three experiments are conducted to demonstrate improvements in map rendering. The results show that a variety of linear map symbols can be constructed in a uniform way, which suggests that the proposed method addresses the difficulty in drawing linear map symbols. With this method, the efficiency of rendering linear map elements is substantially improved compared to using the graphics device interface plus (GDI+) and anti-grain geometry (AGG) methods; it also provides an applicable approach for developing map rendering systems. Using this function-based concept, the complexity of building linear map symbols and drawing linear map elements can be decreased.

show abstract

“…Using this method, the road elements of different grades are organized into various map layers, and roads with larger grades are typically higher (in elevation) than roads with smaller grades. Therefore, the method works by first drawing roads with smaller grades in a map layer and then drawing roads of higher grades in the next map layer [32]. This method partly serves to present the desired connectivity information: it draws all roads in a single map layer as connected and draws roads in different map layers as unconnected (with higher-grade roads covering smaller-grade roads).…”

Section: Introductionmentioning

confidence: 99%

A Representation Method for Complex Road Networks in Virtual Geographic Environments

Zheng

Hong

Yue

et al. 2017

IJGI

View full text Add to dashboard Cite

Road networks are important for modelling the urban geographic environment. It is necessary to determine the spatial relationships of road intersections when using maps to help researchers conduct virtual urban geographic experiments (because a road intersection might occur as a connected cross or as an unconnected bridge overpass). Based on the concept of using different map layers to organize the render order of each road segment, three methods (manual, semi-automatic and mask-based automatic) are available to help map designers arrange the rendering order. However, significant efforts are still needed, and rendering efficiency remains problematic with these methods. This paper considers the Discrete, Crossing, Overpass, Underpass, Conjunction, Up-overlap and Down-overlap spatial relationships of road intersections. An automatic method is proposed to represent these spatial relationships when drawing road networks on a map. The data-layer organization method (reflecting road grade and elevation-level information) and the symbol-layer decomposition method (reflecting road covering order in the vertical direction) are designed to determine the rendering order of each road element when rendering a map. In addition, an "auxiliary-drawing-action" (for drawing road segments belonging to different grades and elevations) is proposed to adjust the rendering sequences automatically. Two experiments are conducted to demonstrate the feasibility and efficiency of the method, and the results demonstrate that it can effectively handle spatial relationships of road networks in map representations. Using the proposed method, the difficulty of rendering complex road networks can be reduced.

show abstract

Research on National 1:50000 Topographic Cartography Data Organization

Cited by 4 publications

References 0 publications

An Efficient, Platform-Independent Map Rendering Framework for Mobile Augmented Reality

An Efficient, Platform-Independent Map Rendering Framework for Mobile Augmented Reality

A function-based linear map symbol building and rendering method using shader language

A Representation Method for Complex Road Networks in Virtual Geographic Environments

Contact Info

Product

Resources

About