Vector fields naturally arise in numerous areas of science and engineering,
such as fluid dynamics, aerodynamics, electromagnetism, computer vision and
biology. A popular approach to vector field analysis is vector field topology,
whose goal has traditionally been to describe vector field data in terms of
features such as stationary points, periodic orbits and separatrices.
Designing robust algorithms for finding such features and estimating their
importance is one of the important fundamental problems in scientific