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I am using the processing toolbox interface to launch the "Shortest path (point to point)" command to connect two points using a line network layer (see attached photo).

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If I fill out the starting and ending point coordinates of the Parameters Window by clicking directly in the screen, the algoritm works fine, but if I write out directly the coordinates of the two points in the Start Point and End Point boxes

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I always get

There is no route from start point to end point.

enter image description here

Why I am getting this error if there is a route to connect both points?

I am using Windows 10, I have 16 GB of memory, Intel Core i7 vPro. QGIS version 3.12.0-Bucuresti

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  • All elements, point coordinates and line network layer use the same CRS, EPSG:25832. The point coordinates that I type in box are the one used to upload the point layer, so coordinates should be fine
    – sonia
    Oct 15, 2020 at 13:44
  • By doing the "Split with lines" command to the input line network layer, the algorithm has worked fine. Thanks a lot
    – sonia
    Oct 15, 2020 at 14:05

1 Answer 1

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Credits to @MrXsquared from his answer https://gis.stackexchange.com/a/308137/99589

Before processing it is necessary to connect lines via nodes. For that use "Split with lines" geoalgorithm. By choosing line layer as 'Input layer' as well as 'Split layer' it will brake lines into linestrings on vertices where lines intersect.

And afterwards continue with "Shortest path (point to point)".

P.S. Mind that both layers (points and lines) have to share the same CRS. Moreover, it may be useful to check the consistency and topological correctness of lines beforehand.

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