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ISPRS Int. J. Geo-Inf. 2016, 5(12), 223; doi:10.3390/ijgi5120223

A Novel Evaluation Approach for Line Simplification Algorithms towards Vector Map Visualization

1,2,* and 3
1
State Key Laboratory of Resources and Environmental Information System, Institute of Geographical Sciences and Natural Resources Research, Beijing 100101, China
2
Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing 210023, China
3
School of Computer and Information Engineering, Henan University, Kaifeng 475004, China
*
Author to whom correspondence should be addressed.
Academic Editors: Qiming Zhou and Wolfgang Kainz
Received: 17 August 2016 / Revised: 11 November 2016 / Accepted: 16 November 2016 / Published: 29 November 2016
View Full-Text   |   Download PDF [3150 KB, uploaded 29 November 2016]   |  

Abstract

Line simplification is an important method in the context of cartographic generalization, which is helpful for improving the visualization of digital vector maps. The evaluation method for the simplification algorithms is still an open issue when facing applications of vector data, including progressive transmission, web mapping, and so on. This paper proposes a novel evaluation approach for line simplification algorithms based on several factors towards vector map visualization, including the features of displays, map scales, and the ability of the human eye to distinguish pixels. In order to ensure the evaluation of the line simplification algorithms is conducted under the consistent strength of simplification, a measurement approach for the difference between an original line and its simplified one is proposed in this study, and the method of solving the appropriate simplification threshold is presented. With this method, four simplification algorithms are evaluated at five map scales using three evaluation indicators: standard deviation, compression ratio, and simplification time. The experiment and results show the evaluation approach in this study is feasible, and represents a good means in which to facilitate the application of line simplification towards progressive transmission and visualization of vector maps. View Full-Text
Keywords: vector map; line simplification; simplification threshold; simplification evaluation indicator vector map; line simplification; simplification threshold; simplification evaluation indicator
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Song, J.; Miao, R. A Novel Evaluation Approach for Line Simplification Algorithms towards Vector Map Visualization. ISPRS Int. J. Geo-Inf. 2016, 5, 223.

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