| 一种顾及符号完整性的矢量瓦片地图改进方案 |
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| 引用本文： | 刘鹏程,许小峰,杨敏.一种顾及符号完整性的矢量瓦片地图改进方案[J].武汉大学学报(信息科学版),2022,47(3):455-462. |
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| 作者姓名： | 刘鹏程 许小峰 杨敏 |
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| 作者单位： | 1.华中师范大学地理过程分析与模拟湖北省重点实验室，湖北 武汉，430079 |
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| 基金项目： | 国家自然科学基金42071455国家自然科学基金41871377中央高校自主科研项目CCNU30106190454数字制图与国土信息应用工程自然资源部重点实验室开放研究基金ZRZYBWD201909 |
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| 摘 要： | 在矢量瓦片地图中,跨网格的要素被分割成多个部分,常常造成点、线、面要素中非均匀符号在网格边界处的不连续,这样不仅影响视觉效果,还容易引发空间认知错误.在保持矢量瓦片数据和样式独立的基础上,提出使用预处理和实时绘制相结合的方法解决这类问题.通过分析不同要素符号在网格边界不连续的类型和原因,提取了不同类型的绘图辅助信息;将...
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| 关 键 词： | 矢量瓦片 地图制图 符号完整性 矢量地图 |
| 收稿时间： | 2020-03-08 |
An Improved Schema for Vector Tile Map Considering Symbol Integrity |
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| Affiliation: | 1.Key Laboratory for Geographical Process Analysis and Simulation, Central China Normal University, Wuhan 430079, China2.School of Urban and Environmental Science, Central China Normal University, Wuhan 430079, China3.Wuhan Natural Resources and Planning Information Center, Wuhan 430014, China4.School of Resource and Environmental Sciences, Wuhan University, Wuhan 430079, China |
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| Abstract: | Objectives Vector tile technology is considered as a new generation of Web map solution. Compared with raster tile, vector tile is more flexible. It renders the map based on vector data and preset styles on the client. Therefore, users can easily change map styles without reproducing tile data. However, in vector tile maps, the features that cross the grid are divided into multiple parts, which often cause non-uniform symbol discontinuities of point, line, and area features. It not only affects visualization effect, but also leads to spatial cognitive errors. Methods On the premise of independence coordinate data and symbol style of vector tile, a schema combining preprocessing and real-time rendering is proposed to solve these problems. By analyzing the types and causes of discontinuity of different feature's symbols at the grid boundary, drawing auxiliary information for different types of symbols is extracted, which is used to adjust initial position of symbol unit in the tile and to realize the continuous representation of symbols. Results A prototype system based on this scheme was developed and a large scale map mapping experiment was performed. Experimental results show that the proposed method can solve the problem of symbol discontinuity at the grid boundary. Conclusions The proposed method can meet the needs of vector tile production and drawing in terms of reu-sability and efficiency. |
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