add function to simplify measurements dataframe

[veenstrajelmer]

• ddlpy version: master
• Python version: 3.11
• Operating System: Windows

Description

The returned measurements dataframe is very complete. However, it contains a lot of metadata that is often the same for all rows. Add a function to drop all these constant rows and that return a dict with all the key+value pairs. This would also help in the conversion to e.g. xarray.

What I Did

This function adds all constant metadata to a xarray dataset attrs and all varying metadata as additional variables to the xarray dataset. It can be used as a first step:
https://github.com/Deltares/dfm_tools/blob/a8e5631e8c0257a29f3b0a4397f97f9fee1ace84/dfm_tools/observations.py#L919-L935