Unearthing the X-Streams: Visualizing Water Contamination : VAST Mini-Challenge 2 Honorable Mention: Clarity of Narrative

摘要

The datasets released for VAST 2018 Mini Challenge 2 pertain to sensor readings capturing chemical concentrations and physical properties from water bodies in the Boonsong Lekagul wildlife preserve. This challenge is in continuation to the VAST 2017 Challenge, where the company Kasios was identified as the culprit in dumping the chemical - Methylosmoline. In the absence of actual chemical measurements in the soil, challenge participants need to visualize chemical contamination based on the proximal water bodies to identify trends of interest. A horizon plot developed helps to narrow down the complete list of 106 chemicals provided to only 7, from where control charts are used to identify change points and periods of abnormal activity. In addition, a sequential sampling strategy to capture differences in chemical patterns along the flow of the river is recommended using a sunburst diagram.