The paper discusses about the challenges faced today in terms of computing power required to process multi-variant geometric flow visualizations. It was a very good attempt by authors to survey and classify the geometric flow visualization according to the most important challenges when considering that visualization.
As discussed in the previous papers too, the area of spatial visualization is quite mature. I found this paper very useful as the authors have discussed variety of techniques that are there for such geometric visualizations. However, I am surprised that there has been about more than two decades of research and still we have some unsolved problems and struggling with major challenges of computational power.
Also, the author claims that the last time this topic was addressed over six years ago. It seems to me that either this is not quite significant area of research in visualization or may be as discussed before, we lack much computational power.
Overall, it's a very useful paper for anyone who wants to know more about spatial visualizations and wants to get a vague idea about the algorithms that are used today in the field of flow visualization research.
Also, it would be great if we can first classify set of areas where spatial visualizations like these would make certain impact as currently it seems that it's a war between applicability vs computational needs.
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