Crayfish 2.0: What's new! - Lutra Consulting

After listening to user feedback we decided to do some major work on Crayfish. The changes include code refactoring, changes to the user interface, support for an additional file format, adding a vector and contour overlay, and a shiny new logo!

Time control

In the new version of Crayfish a time slider allows users to quickly browse through time. A drop-down menu allows the selection of an exact time.

Vector and contour overlay

In previous versions of Crayfish it was only possible to load contours and vectors from the same dataset. For example, it was not possible to show velocity vectors on top of depth contours. With the new Crayfish you can "unlock" the legend and choose different vectors or contours to be displayed. The video below demonstrates this in action.

Special times

Some datasets contain a special time-step outside the outputted time range. For example, Maximums and Minimums are stored at time 99999 in TUFLOW modelling package. Within the layer tree, additional time-steps items will now be shown if they exist within the dataset.

Additional file formats

We have added support for the XMDF file format. In addition, Hydro_AS 2D users should be able to open their files in the latest Crayfish.

New Python Module

We've refactored lots of code in the Crayfish library which makes it much easier to add support for further file formats and additional functionality. The Crayfish library now comes with a new Python module that allows easy manipulation with the mesh and results data - either in your custom scripts or within the QGIS Python console. For example, printing the coordinates of the nodes of a mesh together with their elevation takes just few lines of code:

import crayfish

m = crayfish.Mesh("/data/my_mesh.2dm")
o = m.dataset(0).output(0) # bed elevation data

for index, node in enumerate(m.nodes()):
print "Node XYZ: ", node.x, node.y, o.value(index)

New Profile tool plugin

If you use Profile tool plugin in QGIS, you can create a profile from the Crayfish layer and browse through the time. The profile gets updated as you change the output time.

Problems

If you have some feedback on our changes, suggestions for new functionality, or come across a bug, feel free to file a ticket on the issues page of the Crayfish github repository.