FTLE Computation Beyond First-Order Approximation
FTLE Computation Beyond First-Order Approximation
复制标题
超越一阶近似的 FTLE 计算
DOI：
10.2312/conf/eg2012/short/061-064
复制
发表时间：
2012
影响因子：
4.6
通讯作者：
T. Ertl
中科院分区：
文献类型：
--
作者：
M. Üffinger;F. Sadlo;R. Kirby;C. Hansen;T. Ertl
We present a framework for different approaches to finite-time Lyapunov exponent (FTLE) computation for 2D vector fields, based on the advection of seeding circles. On the one hand it unifies the popular flow map approach with techniques based on the evaluation of distinguished trajectories, such as renormalization. On the other hand it allows for the exploration of their order of approximation (first-order approximation representing the flow map gradient). Using this framework, we derive a measure for nonlinearity of the flow map, that brings us to the definition of a new FTLE approach. We also show how the nonlinearity measure can be used as a criterion for flow map refinement for more accurate FTLE computation, and we demonstrate that ridge extraction in supersampled FTLE leads to superior ridge quality.
