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本文对不确定性可视化表达的主要技术与方法进行了简要论述,进而以北京市城市边缘带样区基于地统计学的土壤表层的pH空间预测作为案例研究,以相对误差表示预测结果的不确定性,应用色调-饱和度-亮度(HSI)色彩模型实现土壤属性预测结果和不确定信息的可视化同步表达。在HSI模型中,色调值被用来表示预测值,白度表示不确定性。在案例研究的pH预测输出结果中,颜色发白的区域表示预测结果的不确定性较高,需要做进一步补充采样。实际应用过程中发现,二维图例对不确定性的可视化表达效果有一定的限制作用,仍需在二维图例完善或创建新型图例方面开展深入的研究工作。图3参14。
In this paper, the main techniques and methods of visual expression of uncertainty are briefly discussed. Then based on the geostatistical prediction of soil surface pH space in urban fringe belts in Beijing, the relative error is used to indicate the uncertainty of the prediction results The HSI color model is used to visualize simultaneous predictions of soil properties and uncertain information. In the HSI model, the hue value is used to represent the predicted value and the whiteness to indicate the uncertainty. In the case study’s pH predictive output, areas that are white in color indicate a high degree of uncertainty in the predictions and require additional sampling. In practice, it is found that two-dimensional legends have a certain limiting effect on the visual expression of uncertainty, and further research work is needed to perfect or create new legends in two-dimensional legends. Figure 3 Reference 14.