5. A GUI and further modifications to constraints: MyDTW

Building on Cdtw, Kotov + Pälike developed a cross-platform tool “MyDTW”, which takes a number of new approaches to deal with unrealistic sedimentation rate changes.

The software is available as binary here, and in source form here.

Specifically, this is achieved by:

• No degradation in matched sequences:

  • Every sample in data must have one and only one link (age) to target

  • No any of two data samples have the same link (age) to target

• Tuning is controlled by native geological parameters (e.g. Min-Max sedimentation rates, elasticity control on relative sedimenation rate)

The following are taken from the README.pdf

Fig. 5.1 Generalised extended Target Schema for MyDTW)

Below shows the local and global contraints as in MyDTW:

Fig. 5.2 Local and Global Constraints for MyDTW)

There are extra options introduced to restrict the elasticity of the warping path or the derivative of the sedimentation rate.

– The elasticity parameter mimics the restrictions on the first derivative of the sedimentation rate, i. e. the maximal ratios of two consecutive steps in the best warping path.

– ‘Allow Hiatuses’ removes restrictions on minimal sedimentation rate, the warping path is searched based only on the accumulate cost matrix.

Fig. 5.3 GUI configuration MyDTW (1).

Fig. 5.4 GUI configuration MyDTW (2).