[Qgis-user] Isochrones

[Ujaval Gandhi]

Hi Tyler,

I have step-by-step tutorials for using the built-in network analysis
tools, QNEAT3 and ORS Tools plugins that show how to setup and use them. Do
have a look and see if you can make it work for your dataset.

*Basic Network Visualization and Routing (QGIS3)*
<https://www.qgistutorials.com/en/docs/3/basic_network_analysis.html>
*Locating Nearest Facility with Origin-Destination Matrix (QGIS3)*
<https://www.qgistutorials.com/en/docs/3/origin_destination_matrix.html>
*Service Area Analysis using Openrouteservice (QGIS3)*
<https://www.qgistutorials.com/en/docs/3/service_area_analysis.html>
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Ujaval Gandhi
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On Wed, Mar 25, 2020 at 9:05 PM Nicolas Cadieux <
nicolas.cadieux at archeotec.ca> wrote:

> Hi,
>
> The first thing I would do is to check the network integrity.  Perhaps
> some road are not connected (snapped).  You also need a snap and break at
> every intersection. You can do some of this by exporting all the end node.
> Check for multiline vs lines. You can split all of those in the vector
> menu.  Your problems are likely linked to a bad network topology. Users of
> that network could perhaps confirm this? I have used it but not for this
> type of stuff.
>
> Nicolas Cadieux
>
> > Le 25 mars 2020 à 10:22, Tyler Veinot <tylerkveinot at gmail.com> a écrit :
> >
> > 
> > All;
> > I have a network, Canada National Road Network it is a free download,
> that I am trying to use for PEI and the City of Charlottetown to find out
> what area is within X time of various points of interest. I used Here for
> QGIS to get the initial result but QGIS has a tool built in Network Analyst
> that has Service Area from Network and from Point, also and QNEAT that has
> 6 isochrone tools for doing exactly what I am trying to do. For some reason
> though the results don't seem to match the network. I would expect the from
> the point of origin the shortest times to be along the lines and radiate
> out.
> > What tools are you guys using to do this kind of work? Do my values for
> forward backward both direction need to be numeric? Any tutorials on using
> these tools?
> > Thanks;
> > Tyler
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