snap_to_branch

[MatthiasHHSK]

The snap_to_branch does not really snap geometries to branches? It only returns the columns: [branch_offset, branch_id]

"def snap_to_branch(self, branches, snap_method, maxdist=5):
"""Snap the geometries to the branch"""
spatial.find_nearest_branch(
branches=branches, geometries=self, method=snap_method, maxdist=maxdist
)"

or do I miss something?

[BdGraaff]

You are correct. There is an example notebook with test data that demonstrates how the functions can be used:
https://github.com/Deltares/HYDROLIB/tree/main/hydrolib/notebooks

The test data can be found here:
https://github.com/Deltares/HYDROLIB/tree/main/hydrolib/tests/data

Here is an example from this notebook for a weir:
hydamo.weirs.read_gpkg_layer(gpkg_file, layer_name="Stuw", index_col="code")
hydamo.weirs.snap_to_branch(hydamo.branches, snap_method="overal", maxdist=10)
hydamo.weirs.dropna(axis=0, inplace=True, subset=["branch_offset"])

In the last line the objects with that shouldn't be snapped are dropped from the dataframe and will not be incorporated in the schematization.

[MatthiasHHSK]

Thanks! I am aware of the example notebook.
So this functions does not change the geometry, it adds the offset and further on in the data conversion the geometry is changed?

[BdGraaff]

The geometry is not changed. Using the function it is determined to which branch the object should be snapped and also on what chainage. This for example the result of the function for one weir in a model:

This is the result in the structure.ini file when writing the model: