A Technique for Skeletonizing a Scalar Field Using a Critical Point Graph: Application to a Weather Simulation
A Technique for Skeletonizing a Scalar Field Using a Critical Point Graph: Application to a Weather Simulation
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使用临界点图骨架化标量场的技术：在天气模拟中的应用
DOI：
10.1115/pvp2002-1533
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发表时间：
2002
期刊：
影响因子：
--
通讯作者：
A. Doi
中科院分区：
文献类型：
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作者：
Kazuma Kamisawa;Koji Sakai;K. Koyamada;A. Doi
我们提出了一种可视化技术，大规模检测在所有尺度的结构，从用户的责任，提取隐含在数据中的信息，并提出明确的结构进行分析和检索。在典型的科学应用中，数据在元素网格的节点处表示，并在元素内部线性插值。在标量场的梯度场中存在临界点。用连接临界点的图来表示标量场是可能的。在过去，我们提出了一种使用极值骨架有效计算等值面的技术，该骨架由元素组成并连接所有极值点[3]。该算法首先提取标量场的极值点。然后生成一个图，其中极值点作为节点。我们的工作可以被看作是我们原始技术的扩展，因为我们的新骨架除了连接极值点之外还连接鞍点。为了证实我们的技术的有效性，我们提取了预测天气的CFD结果的特征骨架，并确定了风速、温度和湿度等多个标量变量之间的线性相关性。
We present a visualization technique which a large scale detects the structure at all scales removing from the user the responsibility of extracting information implicit in the data, and presenting the structure explicitly for analysis and retrieval. In typical scientific applications, data is represented at the nodes of a mesh of elements and interpolated linearly across the interior of the elements. A critical point exists in the gradient field of the Scalar filed. It is possible at few cost to express the Scalar field using the graph which connected the critical point. In past, we proposed a technique for calculating isosurfaces efficiently using an extrema skeleton, which consists of elements and connects all extrema points [3]. In this algorithm, extrema points in a scalar field are first extracted. A graph is then generated in which the extrema points are taken as nodes. And our work can be regarded as an extension of our original technique, because our new skeleton connects saddle points in addition to extrema points. To confirm the effectiveness of our technique, we extract features skeletons of CFD results for forecasting weather and determine linear correlation between multiple scalar variables such as wind velocity, temperature, and humidity.Copyright © 2002 by ASME