In the world of GIS, vector and raster are the most common data types to represent real world features. But not always, vectors and rasters can describe the complexity and nature of the data.
Example of those datasets are:
For more details of the rational behind introducing MDAL, see the QGIS Enhancement Proposal with great suggestions and feedback from the developers.
TL;DR: we needed a new abstraction library to handle the mesh data formats similar to GDAL/OGR dealing with rasters and vectors.
After the feedback from the QGIS community, we have introduced MDAL library earlier this year. It took us a bit of time to put the infrastructure in place. There are already some formats available from MDAL. The library was integrated to QGIS from 3.2. But extensive improvements and new features were added during 3.4.
There are still more formats to support. In QGIS, we will also need to enhance the spatial indexing and performance of the driver in general. For more information visit MDAL website.
In QGIS, from the main menu > Layer > Data Source Manager. A new window will appear. From the left panel, click on Mesh and point to the downloaded file.
You should be able to see a figure similar to the one below:
To view quantities within the mesh, you can open the Layer Styling Panel. Click on Styling tab:
We have recently released a new version of Crayfish plugin to work directly with mesh layer in QGIS. Crayfish is now based on Python only and can be installed on all main platforms (including MacOS).
We are planning to add mesh calculator (either as a core QGIS feature or Crayfish/Processing plugin). There will be more formats in the pipeline to support in MDAL too.
If you’d like to add support for your mesh layer to MDAL, you can follow the examples on the github repository. We are always happy to help.