I have encountered a bunch of errors while estimating the APS.
The graph seems to be coherent enough, but some points are disconnected.
Is it mandatory in this case to refine my graph. Is there another may to resolve those errors?
Here you inputed a threshold on the connections length.
When you do so and you get isolated points, the way to fix it is using the graph analysis and refinement module.
We will implement a modification in the near future to remove isolated points at the time of the graph creation in the APS module, when a threshold on the connections length is inputed.