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Fishery View Project Team: Ying Zhang, Lan Wu Improvement of Time Series Line Chart Visualization of Fishery Data
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Fishery View Background : –The Fishery Department at UBC uses a tool called Ecopath to perform the analysis on the relationship of marine species in a food network and impact of human’s fishing strategy on them. –Ecopath uses a line chart system to draw the trends of all fish populations. –The line chart is as the following:
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Can anyone see problems with this graph?
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Problems Currently fish groups are represented by different colors of lines on the graph. However, due to the number of lines drawn on the screen, the chart suffers from an overload of visual information because of cluttering and overlapping.
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Proposed Solution 1 Line Layering with Brushing through the Names of Fish Species: –The diet matrix describes the relationship of eating and being eaten (related and unrelated). –By moving the mouse onto the top of a specific fish species, all the lines of its related fish species will be highlighted based on the diet matrix using a multiple color scheme. Any other lines of unrelated fish species will be put in the background in gray color.
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Proposed Solution 2 Difference Graph: –This is to present the change of all kinds of fish population before and after a fishing strategy is applied. By only plotting the difference on the graph, the impact of fishing strategy on fish population will be clearly shown.
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Proposed Solution 3 Line Clustering. –We first sample M time points along the time series and record the population of each of the N fish species at that time point. –With the matrix describing the fish population on the M time points provided, we calculate the sum-of-square- difference between each two of these N fish populations. With these data, we can construct the 'clustering matrix'. –By searching in the 'clustering matrix', we can find the most similar fish species based on sum-of-square- difference, and then cluster them into one group.
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Proposed Solution 4 Line Chart Zooming: – For the current line charts, all the lines drawn overlap with each other seriously. –Zooming can enlarge a specific area of the line chart to a certain scale, so that the difference among the lines can be easily viewed.
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