A learning-based approach to automatically evaluate the quality of sequential color schemes for maps. Issue 5 (3rd September 2021)

• Record Type: Journal Article
• Authors: Chen, Taisheng; Chen, Menglin; Zhu, A-Xing; Jiang, Weixing
• Is Part Of: Cartography and geographic information science. Volume 48:Issue 5(2021)
• Page Start: 377
• Page End: 392
• Publication Date: 2021-09-03
• Subjects: Map color -- sequential color scheme -- color quality -- machine learning; Cartography -- Periodicals; Geographic information systems -- Periodicals; 526
• DOI: 10.1080/15230406.2021.1936184
• Languages: English
• ISSNs: 1523-0406

Abstract

ABSTRACT: Color quality evaluation is key to judging map quality, which can improve data visualization and communication. However, most existing methods for evaluating map colors are tedious and subjective manual methods. In this paper, we study sequential color schemes, a widely used map color type and propose a learning-based approach for evaluating the color quality. The approach consists of two steps. First, we extract and characterize the cartographic factors for determining the quality of sequential color schemes, such as color order, color match, color harmony, color discrimination and color uniformity. Second, we present a model to predict the color quality based on AdaBoost, a type of ensemble learning algorithm with excellent classification performance and use these factors as input data. We conduct a case study based on 781 samples and train the AdaBoost-based model to predict the quality of sequential color schemes. To evaluate the model's performance, we calculated the area under the receiver operating characteristic (ROC) curve (AUC). The AUC values are 0.983 and 0.977 on the training data and testing data, respectively. These results indicate that the proposed approach can be used to automatically evaluate the quality of sequential color schemes for maps, which helps mapmakers select good colors.