In this poster we discuss the concept of sparklines that can be used for
analysing trends in cluttered displays in parallel coordinates. The parallel
coordinates sparklines have been implemented in the web-based visualization
tool ViewExposed to help users analyse data on exposure and vulnerability to
natural hazards. To validate the usability of our proposed method, we have
conducted user tests with 53 participants and our results show that the
sparklines are particularly useful for revealing significant trends.