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Jak vygenerovat skutečnou geometrii prvků varianty linky pomocí nástroje "GTFS To Public Transit Data Model"?

Allenlai

Délka a tvar prvku linky nejsou vyhodnocovačem Public Transit používány k výpočtu doby cestování. Když vytvářím své tabulky datového modelu z dat GTFS pomocí nástroje GTFS To Public Transit Data Model, prvky varianty linky budou jednoduché přímé čáry spojující sousední zastávky veřejné dopravy.<\/SPAN><\/P>Nicméně je opravdu důležité zobrazit skutečnou geometrii prvků varianty linky pomocí nástroje pro analýzu servisní oblasti. Není přímočaré zobrazit pokrytí linek a zastávek veřejné dopravy pomocí jednoduchých přímých čar.<\/SPAN><\/P>Proto je moje otázka, jak vygenerovat skutečnou geometrii prvků varianty linky. Možná by bylo dobré nahradit tvar prvků varianty linky pomocí nástroje "GTFS To Public Transit Data Model". Nicméně jsem nemohl najít dostupné metody, jak toho dosáhnout. <\/SPAN><\/P>Dejte mi nějaké tipy nebo jakékoli návrhy, prosím. Moc děkuji!<\/SPAN><\/P>

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Melinda Morang

You have understood the software's behavior correctly: GTFS To Public Transit Data Model generates straight-line connections between stops rather than attempting to create geometry that follows the streets traveled by buses. Fundamentally, the geometry is not needed for the network analysis, but the reason we built the tool this way has more to do with the fact that it is difficult or impossible to extract this information reliably from GTFS datasets. The geographic shapes of routes are stored in shapes.txt, which is an optional file that ties in only tangentially with the schedule data.

If including the actual route geometry in your network dataset is important to you, you can try using the GTFS Shapes To Features tool, which creates a line feature class from the information in the shapes.txt file of your GTFS dataset. You would then need to carefully swap out the LineVariantElement geometry for the geometry from the feature class of shapes, all the while being very careful to maintain proper network connectivity (snapping the stops to the shape features and splitting them, etc.). I do not expect this to be straightforward or automatable, and often the quality of the data in shapes.txt is not great.

You could also try using the Conflation tools to try to make the LineVariantElements match the shapes of the streets where the transit travels.

All comments

Melinda Morang

You could also try using the Conflation tools to try to make the LineVariantElements match the shapes of the streets where the transit travels.

Allenlai

Thx!!!! Your suggestion helps me a lot. I will try to swap out the LineVariantElement geometry for the geometry from the feature class of shapes.

Melinda Morang

In case this topic is still relevant to you, I wanted to share that with the ArcGIS Pro 3.4 release, you can now create a new Public Transit Data Model feature class, LVEShapes, to store the pretty on-street transit route shapes for visualization instead of just the straight-line stop connections in the LineVariantElements feature class. You can create an LVEShapes feature class from a GTFS shapes.txt file when running the GTFS To Public Transit Data Model tool.

Once you have a transit-enabled network dataset that includes LVEShapes, you can solve a Route or Closest Facility analysis and use a new downloadable prototype tool, Replace Route Geometry With LVEShapes, to post-process the output routes to swap the geometry derived from LineVariantElements with geometry derived from LVEShapes. That tool is part of the Transit Network Analysis Tools download, which you can get from GitHub or ArcGIS Online.

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