Nicolas is right. There is good chance the topology is a bit messed up. You
can spend Lot of time fixing it up so I would suggest downloading the gis
basmap layers from the pei government website. There us a large scale database
for Charlottetown (1:2000) that will work better for you. Just search gis
database pei.KirkSent from my Samsung Galaxy smartphone.
-------- Original message --------From: Nicolas Cadieux
<nicolas.cadi...@archeotec.ca> Date: 2020-03-25 12:35 PM (GMT-04:00) To:
Tyler Veinot <tylerkvei...@gmail.com> Cc: QGIS User List
<qgis-user@lists.osgeo.org> Subject: Re: [Qgis-user] Isochrones 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 <tylerkvei...@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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