Network from Lines

Turn a roads or rivers layer into a graph — nodes, edges, connected components — and see exactly how much a snap tolerance changes the answer. Free, runs entirely in your browser: the file never leaves your computer.

Upload a line layer (roads, rivers, any network of LineString features) and build a graph from it: nodes at the line endpoints, edges along the lines themselves. A line network is only ever as connected as its own noding — two segments that were meant to meet but miss by a few centimeters become two separate pieces of the graph unless you tell the tool how close counts as “the same point”. The snap tolerance slider below makes that decision visible instead of silent.

Tip

Private by design. Your file is processed entirely in your browser (Python via WebAssembly) — it’s never uploaded to any server, including ours. Nothing to configure, nothing to trust: the code never gets the chance to see your data.

First run loads the Python engine — expect 30-40 seconds. Instant after that, and again each time you come back to this page.